JPH0699884B2 - Method for preventing collapse of rockfall protection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an existing rockfall protection structure (in the present specification, the term "rockfall protection structure" is used to protect roads or railways from rockfalls, landslides, etc.). Refers to a structure such as reinforced concrete that covers the road or railroad), and a method for preventing collapse of a rockfall protection structure for preventing the structure from collapsing due to rockfall, landslide, etc.

[Problems to be Solved by Conventional Techniques and Inventions]

Rock fall protection structures often collapse due to a large amount of rock fall, landslides, etc., damaging precious lives and making roads or railways inaccessible. However, there is no effective way to prevent existing rockfall protection structures from such collapse.

In view of such a fact, the present invention has been made to provide an effective collapse prevention method for a rockfall protection structure.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides a method in which rocks, earth and sand, etc. above an existing rockfall protection structure are gradually dropped and removed without damaging the rockfall protection structure. is there. That is, the method for preventing collapse of a rockfall protection structure according to the present invention comprises fixing a lower plate to the upper surface of an existing rockfall protection structure, using a spring on the mountain side edge and a hinge on the valley side edge on the upper surface of the lower plate. They are fixed to each other, and the hinges are detachably attached to the valley-side edges on the lower surface of the upper plate so that the upper plate is arranged above the lower plate via the spring in a state where the valley side is inclined so that the valley side becomes lower, A feature is that rocks, earth and sand, etc. above the rockfall protection structure are dropped little by little onto the upper plate, and these rocks, earth and sand, etc. are dropped from the upper plate to the valley side of the rockfall protection structure. Is.

[Action]

In the method for preventing collapse of a rockfall protection structure according to the present invention,
When rocks, earth and sand, etc. above the rock fall protection structure are dropped on the upper plate little by little, the upper plate rotates once downwards against the force of the spring around the hinge due to the weight of the rock, earth and sand, etc. around the hinge. To do. In this way, since the upper plate rotates downward while contracting the spring, the shock wave against the rockfall protection structure due to the fall of rocks, earth and sand, etc. is remarkably reduced. Subsequently, the upper plate rotates upward due to the reaction of the spring, which is combined with the fact that the upper plate is inclined so that the valley side becomes lower, so rocks, earth and sand, etc. on the upper plate are protected from falling rocks from the upper plate. It falls to the valley side of the structure.

As mentioned above, rocks and earth above the rockfall protection structure are removed until there is no risk of rockfall or sediment collapse. The upper plate and the lower plate are sequentially moved in the lateral direction to remove rocks, earth and sand, etc. at other places one after another. When removing rocks, earth and sand, etc. near the mountain side edge of the upper plate, cut the spring to lower the height of the spring and lower the upper plate, so that rocks, earth and sand, etc. fall on the upper plate. You may do it.

〔Example〕

 Next, embodiments of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 is an existing rockfall protection structure. Rockfall protection structure 1
A lower plate 2 such as an iron plate is fixed to the upper surface of the. When fixing the lower plate 2 to the upper surface of the rockfall protection structure 1, as an example, one end of the fixing rods 3, 3 ... Driven into the soil near the mountain side (left side in FIG. 1) of the rockfall protection structure 1 is used. Weld to the mountain side end of the lower plate 2. The angle between each fixing rod 3 and the mountain side wall 4 of the rockfall protection structure 1 is, for example, about 60 °. A spring 5 is fixed to the mountain side edge on the upper surface of the lower plate 2, and a hinge 6 is fixed to the valley side (right side in FIG. 1) edge, and the hinge 6 is formed on the lower surface of the upper plate 7 such as an iron plate. The upper plate 7 is disposed above the lower plate 2 via the spring 5 by being detachably attached to the lower plate 2 in a state in which the valley side is lowered. In this state,
Rocks, earth and sand 8 above the rockfall protection structure 1 are dropped little by little onto the upper plate 7 by a small explosion, and these rocks, earth and sand 8 are dropped from the upper plate 7 to the valley side of the rockfall protection structure 1. Let In addition, when the work of removing the rock, earth and sand 8, etc. at one place is completed, the upper plate 7 and the lower plate 2 are separately moved in the lateral direction to remove the rock, earth and sand 8, etc. at the adjacent place. In this case, when the upper plate 7 is moved laterally on the lower plate 2, the L-shaped member 9 is placed near the hinge 6 on the upper surface of the lower plate 2 and the upper plate 7 is supported by the L-shaped member 9. It is desirable to protect the hinge 6 by sliding it in the state.

〔The invention's effect〕

In the present invention, the rock above the existing rockfall protection structure,
By removing the soil and the like in advance, it is possible to reliably prevent the subsequent rockfall, the collapse of the sand and the like, and thus the collapse of the rockfall protection structure can be prevented. Further, as described above, due to the action of the spring between the upper plate and the lower plate, the impact on the rock fall protection structure due to the fall of rocks, earth and sand, etc. is remarkably alleviated and its damage is prevented, and the reaction of the spring and the upper Rocks, earth and sand, etc. that fall on the upper plate due to the inclination of the plate will surely fall to the valley side of the rockfall protection structure.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing a state in which an upper plate is laterally moved, and FIG. 3 is a plan view of the same. 1 ... Rockfall protection structure 2 ... Lower plate 3 ... Fixed rod 4 ... Mountain side wall 5 ... Spring 6 ... Hinge 7 ... Upper plate 8 ... Rock, earth and sand, etc. 9 ... L-shaped material

Claims (1)

[Claims] 1. A lower plate is fixed to an upper surface of an existing rockfall protection structure, a spring is fixed to a mountain side edge of the upper surface of the lower plate, and a hinge is fixed to a valley side edge of the upper plate. The upper plate is detachably attached to the bottom side edge of the lower surface via the spring, and is arranged above the lower plate in a state where the valley side is inclined so that the valley side becomes lower. A method for preventing collapse of a rockfall protection structure, characterized in that the rocks, earth and sand, etc. are dropped little by little onto the upper plate, and these rocks, earth and sand, etc. are dropped from the upper plate to the valley side of the rockfall protection structure.