JP3704110B2 - How to prevent the collapse of Mt. Fuji - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for preventing the collapse of Mt. Fuji, and more particularly, to a method for preventing the collapse of Mt. Fuji by preventing the collapse of earth and sand that continues to the collapse of Mt. Fuji Osawa.
[0002]
[Prior art]
In the fall of Mt. Fuji Osawa, the collapse of earth and sand has continued for many years from the summit to a height of about 2,000 meters, about 2,000 meters long, about 500 meters wide and about 150 meters deep. If such a collapse of the earth and sand is neglected, there is a risk that the beautiful Mt. Fuji, which should be called the national treasure of Japan, will eventually collapse and deform.
[0003]
Therefore, in order to prevent the collapse due to the collapse of Mt. Fuji Osawa, trial construction such as floor solid low dam construction, riparian protection work, slope foundation work, capped rockfall protection net work, etc. has been carried out.
[0004]
[Problems to be solved by the invention]
Each of the above construction methods requires a long period of time and enormous costs for the construction, and also involves the danger of workers due to the collapse of earth and sand.
[0005]
The present invention provides a method for preventing the collapse of Mt. Fuji, which solves the above-mentioned problems in the conventional construction method and can be constructed safely in a short period of time and at a low cost.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides the following method for preventing the collapse of Mt. Fuji.
[0007]
At the lower end of the reinforced concrete column , fix the iron base with a sharp point at the bottom with the external screw provided at the lower part of the reinforcing bar of the column and the internal female screw corresponding to the external screw. A large number of support piles to be manufactured in advance,
Producing a number of protective plates in advance with a locking part on the upper edge of a reinforced concrete plate-like body,
A helicopter is used to drop the support pile from the air onto the sloping ground and embed the base of the support pile into the ground. Set up and stand
Subsequently, the protective plate is suspended by a helicopter through the locking portion, and the protective plate is erected on the support pile at the upper side of the support pile in the inclined land, thereby to the inclined land. A number of protective plates are arranged in a continuous state to form a continuous protective plate,
A method for preventing the collapse of Mt. Fuji, comprising providing a plurality of steps of the continuous protective plate on the slope.
[0008]
[Action]
Each support pile is formed by fixing a steel base having a pointed portion at the bottom to a lower end of a reinforced concrete column, and the weight of the base is larger than that of the column. Accordingly, the support pile can be dropped from the air to the sloped land by a helicopter, the base of the support pile can be buried in the ground, and the support pile can be erected on the sloped land with the columnar body protruding above the ground. . The helicopter drops the drive pile into the sloping ground from an altitude sufficient to allow the steel base of the support pile to be embedded in the sloping ground.
[0009]
The protective plate is also suspended by a helicopter, and the protective plate is erected in a state where it is leaned against the support pile on the upper side of the support pile on an inclined ground. The protective plate is not dropped on the slope from the air, but it is gently lowered onto the slope and leans against the support pile.
[0010]
That is, the work of standing the support pile on the slope and the work of standing the protective plate on the slope can be performed from the air by the helicopter.
[0011]
A continuous protective plate formed by arranging a number of protective plates in a continuous state on an inclined ground prevents the collapse of earth and sand. By providing a number of steps of this continuous protective plate on the slope, the collapse of the earth and sand can be reliably prevented.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings.
[0013]
The method for preventing the collapse of Mt. Fuji according to the present invention is as follows.
[0014]
(1) Manufacture of support piles (see Figs. 4 and 5)
A large number of support piles 1 are manufactured in advance. Each support pile 1 is formed by fixing an iron base 11 having a tip 15 at the bottom to a lower end 3a of a column 3 made of reinforced concrete . What is indicated by reference numeral 9 is a male screw provided in the lower portion 7 of the reinforcing bar 5. What is indicated by reference numeral 13 is a screw provided for the base 11, and the female screw 13 corresponds to the male screw 9.
[0015]
As an example, the weight of the iron base 11 is about 2/3 of the weight of the entire support pile 1. Moreover, the angle 17 (see FIG. 5) of the tip 15 in the base 11 is set to about 30 degrees as an example.
[0016]
In addition, it is desirable to make the column 3 in the support pile 1 slightly smaller in diameter than the base 11 so as to reduce the friction between the column 3 and the earth and sand when the support pile 1 is driven.
[0017]
(2) Manufacture of protective plates (see Figs. 6 and 7)
A number of protective plates 21 are manufactured in advance. Each protection plate 21 is provided with a locking portion 25 on an upper edge 23a of a plate-like body 23 made of reinforced concrete. The locking portion 25 is formed by causing the reinforcing bar 27 in the plate-like body 23 to protrude upward from the upper edge 23a of the plate-like body 23 and forming the upper end of the reinforcing bar 27 in an annular shape, for example. In this case, the reinforcing bar 27 having the locking portion 25 at the upper end is bent at the lower end in the plate-like body 23 to form a bent portion 29, so that the protection plate 21 can be connected to the helicopter via the locking portion 25. It is desirable to prevent the reinforcing bars 27 from coming out when suspended by the. What is indicated by reference numeral 31 is a reinforcing bar other than the reinforcing bar 27 having the locking portion 25 at the upper end.
[0018]
In FIG. 7, a crossing portion 33 between the vertical reinforcing bar 31 and the horizontal reinforcing bar 31 is bound by a steel wire 34.
[0019]
(3) The support pile 1 is dropped into the inclined ground 35 from the air by an upright helicopter of the support pile, and the base 11 of the support pile 1 is buried in the ground. In a state of projecting to the ground, the slope 35 is erected at a predetermined interval.
[0020]
(4) Formation of a continuous protective plate The protective plate 21 is suspended by a helicopter through the locking portion 25 and the protective plate 21 is attached to the support pile 1 on the upper side of the support pile 1 on the inclined ground 35 (left side in FIG. 2). By standing upright in a standing state, a large number of protective plates 21 are continuously arranged on the slope 35 to form a continuous protective plate 38.
[0021]
When the protection plate 21 is suspended by the helicopter via the locking portion 25, as an example, a suspension string 39 such as a wire having a hook portion 37 at the lower end is provided in the helicopter, and the hook portion of the suspension string 39 is provided. 37, the locking portion 25 of the protective plate 21 is locked. After the protection plate 21 is stood on the support pile 1 above the support pile 1 in the inclined ground 35, the hook portion 37 of the hanging strap 39 is pulled out from the locking portion 25 of the protection plate 21.
[0022]
As shown in FIG. 1, the joint 41 between the protective plate 21 and the adjacent protective plate 21 is preferably supported by the support pile 1.
[0023]
(5) Multi-stage arrangement of continuous protective plates The above-mentioned continuous protective plates 38 are provided on the slope 3 in multiple levels in the vertical direction.
[0024]
【The invention's effect】
As described above, according to the present invention, the support pile and the protection plate are manufactured in advance, and the support pile is dropped from the air to the sloped land by the helicopter and supported by hanging the protection plate by the helicopter. Since a number of continuous protective plates are provided on the slope by leaning against the pile, the construction period is shortened and the construction cost is reduced. Furthermore, since the construction work on site is performed by a helicopter, the danger of workers due to the collapse of earth and sand is eliminated.
[Brief description of the drawings]
FIG. 1 is a front view showing a continuous protective plate.
FIG. 2 is a side view showing a state in which a plurality of continuous protective plates are provided.
FIG. 3 is a plan view of the same.
FIG. 4 is a cross-sectional view of a support pile dropped on an inclined land.
FIG. 5 is a cross-sectional view showing a part of a support pile.
FIG. 6 is a cross-sectional view of a suspended protection plate.
FIG. 7 is a front view showing a state in which the reinforcing bars in the protective plate are bound by iron wires.
FIG. 8 is a plan sectional view of a protection plate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Support pile 3 Column 3a Lower end 5 Reinforcing bar 7 Lower part 9 Male thread 11 Base part 13 Female thread 15 Pointed end 21 Guard plate 23 Plate-like body 23a Upper edge 25 Locking part 27 Reinforcing bar 29 Bending part 31 Reinforcing bar 33 Intersection 34 Iron wire 35 Inclined ground 37 Hook part 38 Continuous protective plate 39 Suspension string 41 Seam

Claims (1)

At the lower end of the reinforced concrete column body , fix the iron base with a sharp point at the bottom with the external screw provided at the lower part of the reinforcing bar of the column body and the internal female screw corresponding to the external thread. A large number of support piles to be manufactured in advance,
Producing a number of protective plates in advance with a locking part on the upper edge of a reinforced concrete plate-like body,
A helicopter is used to drop the support pile from the air onto the sloping ground and embed the base of the support pile into the ground. Set up and stand
Subsequently, the protective plate is suspended by a helicopter through the locking portion, and the protective plate is erected in a state of standing on the support pile on the upper side of the support pile in the inclined land. A number of protective plates are arranged in a continuous state to form a continuous protective plate,
A method for preventing the collapse of Mt. Fuji, comprising providing a plurality of steps of the continuous protective plate on the slope.

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