JPH0721168B2 - Snow shed and rock shed load reduction structure - Google Patents

Description

The present invention relates to a snow shed / rock shed load reducing structure.

(Prior Art) A cave called a snow shed or a rock shed is used to prevent damage from avalanches and landslides to the roads on the mountain side.

FIG. 3 shows a conventional snow shed. In the conventional snow shed 100, the roof 102 is inclined toward the valley 104 side, and the earth and sand 108 or the snow that is about to be deposited on the roof 106 is slid toward the valley 104 side.

On the other hand, as shown in FIG. 4, the conventional rock shed has the soil 202 preliminarily laid on the roof 200 at a depth of, for example, about 90 cm so as to absorb the impact of the falling soil 204 and rocks. ing.

(Problems to be Solved by the Invention) However, the above-described conventional snow shed and lock shed have the following problems.

Both the conventional Snow Shed 100 and Rock Shed 206 cannot avoid the accumulation of sediment 108, 204 on the rooftops 106, 200. Therefore, it is necessary to remove the earth and sand 108, 204 accumulated on the rooftop 106, 200, but this cannot be done frequently, and it is common to increase the load bearing capacity of the Snowshed 100 and the Rockshed 206 itself. Further, there is a problem that the construction cost becomes large in combination with the need for impact resistance against impact load.

Therefore, an object of the present invention is to provide a load shedding structure for snow sheds and rock sheds, which can prevent sedimentation on the roof and can suppress the construction cost.

(Means for Solving the Problems) In order to solve the above problems, the present invention has the following configuration.

That is, a lightweight, watertight, buffer-like block-shaped foam is laid on the rooftop so that the thickness gradually increases from the valley side to the mountain side, and the inclination angle of the surface of the laid foam is such as collapsed sand. A block-shaped foam which is characterized in that it is formed to have an expected deposition angle or more, or is lightweight, watertight, and has a cushioning property is laid on the rooftop so that the thickness gradually increases from the valley side to the mountain side, and the foam is formed. The surface of the earth is laid with earth and sand, and the inclination angle of the surface of the earth and sand laid is formed to be larger than or equal to the expected accumulation angle of collapsed earth and sand or the like.

(Operation) The operation will be described.

On the rooftop, a lightweight, water-tight, shock-absorbing block-shaped foam was laid so that it gradually thickened from the valley side to the mountain side, and the slope angle of the surface of the laid foam was predicted to collapse By forming it above the corner, the incident angle of the falling avalanche or collapsing soil against the foam can be made larger, and the impact from the avalanche or collapsing sediment can be reduced, and at the same time, the avalanche or collapsing sediment can be reduced. Can be surely slid down to the valley side, the shock resistance of the snow shed and lock shed can be improved, and the load can be reduced.

In addition, the foam is laid on the roof so that the thickness gradually increases from the valley side to the mountain side, and the earth and sand are laid on the surface of the foam, and the inclination angle of the surface of the laid earth and sand is collapsed to predict the accumulation of sediment. If it is formed more than a corner, the incident angle of the falling avalanche or collapsing sediment can be made larger to the laying sediment, the impact from the avalanche or collapsing sediment can be reduced, and the avalanche or collapsing sediment can be secured. It can be slid to the valley side, the impact resistance of the snow shed and rock shed can be improved, and the load can be reduced. Further, the sand and sand protect the foam, and the durability of the foam can be improved.

(Examples) Hereinafter, preferred examples of the present invention will be described in detail with reference to the accompanying drawings.

First, the case of the snow shed will be described with reference to FIG.

When the snow shed 10 is provided, the roof 12 is inclined so as to descend toward the valley 14 side.

Next, a styrofoam block 18 is laid on the roof 16. At this time, the block 18 is laid so as to gradually increase in thickness from the valley side toward the mountain side, and the surface of the laid block 18 is inclined so as to descend to the valley side. The inclination angle is 16
The angle is adjusted to be slightly shallower than the expected deposition angle at which sediment is expected to accumulate.

The earth and sand 20 for protecting the surface of the styrofoam block 18 is laid on the upper layer of the styrofoam block 18, and the inclination angle A of the whole is equal to or larger than the above-mentioned expected accumulation angle.

When the snow shed 10 is formed in such a structure, when snow falls on the snow shed 10, the impact load is absorbed by the 18-layer block of styrofoam. Further, since the inclination angle A is larger than the expected accumulation angle, the snow and the collapsed earth and sand that have fallen onto the layer of earth and sand 20 do not accumulate on the earth and sand 20 and slide to the valley 14 side.

On the other hand, the lock shed 50 is shown in FIG. Its structure is similar to the Snowshed, with a valley on the roof 52 of Rockshed 50.
A block 56 of styrofoam is laid so as to incline so as to descend toward the 54 side. However, it is not necessary to put the earth and sand for the buffer on the rooftop 52 unlike the conventional case. The slope angle of the 56th layer of the block is also slightly shallower than the expected accumulation angle of collapsed earth and sand.

Next, earth and sand 58, a rubber plate, etc. are laid on the 56th layer of the block so that the inclination angle B of the whole is larger than the expected deposition angle. By adopting such a structure as the lock shed 50 like the snow shed described above, it is possible to absorb the impact load of rock fall and collapsing earth and to prevent the collapsing sediment from accumulating on the roof 52. Become.

In addition, even in the case where the inclination angles A and B are made larger than the expected deposition angle, if the layer of earth and sand 20 and 58 is not provided, the inclination angle of the styrofoam is made larger than the expected deposition angle and the surface of the styrofoam is protected with paint or a protective member. May be.

In the above example, an example of laying a block of styrofoam was given, but as a material suitable for use as a block, it is lightweight, and is airtight, watertight, heat insulating, chemical resistant, self-extinguishing, buffering Are preferable, and, for example, foam such as styrofoam, urethane foam, polyethylene foam, foam sponge rubber, foam silicon, foam vinyl chloride, and a honeycomb structure are suitable.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. is there.

(Effects of the Invention) When the snow shed and lock shed load reducing structure of the present invention is used, a lightweight, watertight, cushioning block-shaped foam is gradually thickened from the valley side to the mountain side. Since the inclination angle of the surface of the laid and laid foam is more than the expected accumulation angle of collapsed sand, etc.,
The incident angle of the falling avalanche or collapsing soil on the foam can be made larger, and the impact from the avalanche or collapsing sediment can be reduced, and the avalanche or collapsing sediment can surely slide to the valley side. Because you can snow shed,
The impact resistance of the lock shed can be increased and the load can be reduced. In addition, the foam is thicker on the mountain side where it first comes into contact with an avalanche or collapsing soil and receives a large impact, and the Tanigawa part that is less susceptible to impact than the mountain side is formed thin. The impact load on the roof can be efficiently absorbed while minimizing the amount. Therefore, the durability of the snow shed and the lock shed is improved, the rebuilding period and the repair period are extended, and the construction cost can be reduced.

If the construction of claim 2 is adopted, the load on the roof is increased because earth and sand are laid on the surface of the foam, but the foam is protected by the earth and sand, and the durability of the foam is improved. Therefore, the snow shed, rock shed. The durability of the building is also improved, and the rebuilding period and the repair period are extended, resulting in a further reduction in construction cost.

[Brief description of drawings]

FIG. 1 is a side view of a snow shed according to the present invention, FIG. 2 is a side view of a lock shed according to the present invention, FIG. 3 is a side view of a conventional snow shed, and FIG. 4 is a side view of a conventional lock shed. 10 …… Snowshed, 12 …… Roof, 16 …… Rooftop, 18…
… Styrofoam blocks, 20 …… Sand and sand, 50 …… Rockshed, 52 …… Rooftop, 56 …… Styrofoam blocks, 58 …… Sand and sand.

Front page continuation (72) Tsutomu Kubota Tsutomu Kubota 6883 Hotaka 1 Hodaka, Hotaka-cho, Minami Azumi-gun, Nagano (72) Inventor Hiroki Osawa 7792 2 Shimo-Izuka, Ikusaka-mura, Higashi-chikuma-gun, Nagano 2 (56) References -154412 (JP, U) Actually opened 60-154411 (JP, U) Actually opened 62-185708 (JP, U)

Claims (2)

[Claims] 1. A lightweight block-shaped foam having watertightness and cushioning property is laid on the roof so that the thickness gradually increases from the valley side to the mountain side, and the inclination angle of the surface of the laid foam collapses. A load shed structure for snow sheds and rock sheds, which is characterized in that it is formed with a sedimentation angle larger than expected. 2. A lightweight block-shaped foam having watertightness and cushioning property is laid on the roof so that the thickness gradually increases from the valley side to the mountain side, and the surface of the foam is laid with earth and sand. A load shedding structure for snow sheds and rock sheds, characterized in that an inclination angle of a surface of the laid earth and sand is formed to be larger than an expected accumulation angle of collapsed earth and sand.