JPH09310535A - Conveyer burying prevention retaining wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage or deformation of a wall even in the case a pile of iron ore, coal or crushed stone, etc., is collapsed at a time, at the same time, make it possible to prevent a conveyer from being buried and to provide economically a wall excellent in corrosion resistance, etc. SOLUTION: Posts 3 are so driven to both sides or one side of a belt-conveyer 4 installed in a yard where iron ore, etc., are piled up that they are projected into the ground in parallel with the belt-conveyer 4. Concrete slabs 2 are installed to the lower parts between the posts, and wooden plates 1 are placed on them. Then, continuous walls are constructed between the posts as a conveyer burying prevention retaining wall. By the constitution, in the case a landslide occurs, impulse energy is absorbed into the wooden plates 1, the wooden plates 1 are destroyed to lessen reaction force acting on the posts 3, deformation is controlled, and the burying of the conveyer 4 can be prevented by preventing the flowout of a pile of iron ore, etc., by the concrete slabs 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burying prevention retaining wall for a belt conveyor installed in a yard where iron ore, coal, crushed stone, etc. are piled up.

[0002]

2. Description of the Related Art For example, in a belt conveyor installed in a yard provided in a steel mill, piled iron ore and coal may collapse and be buried under heavy rain or typhoon. When the belt conveyor is buried, the belt conveyor becomes unusable or the carrying capacity is lowered, resulting in a great loss in production, and it takes a lot of time and money to restore the belt conveyor. As a means of avoiding damage due to these landslides, it is effective to install a retaining wall along the belt conveyor at a predetermined distance on the yard side of the belt conveyor, and as a retaining wall structure,
For example, as disclosed in Japanese Patent Laid-Open No. 50-141140, a pillar using square steel pipe, channel steel, chevron steel, etc. is installed so that assembly and disassembly can be performed easily and quickly, and metal, A method of forming a continuous retaining wall by fixing a large number of small-sized wall bodies made of a single material such as plastic or wood between columns is used.

[0003]

However, the following problems have been pointed out in the above method.

(A) When piles of iron ore, coal, crushed stone, etc. are gradually collapsed, the retaining wall is deformed or destroyed by the horizontal pushing force due to the accumulation of rock fall. In this case, the pushing force acting on the retaining wall is proportional to the height of the retaining wall, and the lower the retaining wall, the larger the value, but the wall body has sufficient strength against static pushing force to deal with these. Should have. However, when it collapses at once, the impact energy becomes incomparably larger than the static pushing force, and in most cases, the entire retaining wall is damaged or leaves a large deformation, and the belt conveyor is buried. However, it must bear a great deal of trouble, time and money for its restoration. In order to avoid this, it is necessary to design the wall body to have sufficient strength against dynamic impact force, resulting in an increase in the length and cross section of the column. Manufacturing and installing a wall requires a great deal of labor and cost, and also causes a problem due to sinking due to the increased weight of the wall.

(B) Further, since the retaining wall is used for a long period of time, the wall body installed near the ground, which is in constant contact with piled objects, does not corrode and is not deteriorated by ultraviolet rays or the like. It is necessary to use materials. For example, it is necessary to take measures to prevent deterioration of metal, plastic, wood, etc. due to corrosion and ultraviolet rays, which requires a great deal of cost.

According to the present invention, even when a pile of iron ore, coal, crushed stone, etc. collapses at one time, it is possible to suppress damage and deformation of the wall body, prevent burial of the conveyor, and prevent corrosion. It provides an excellent belt conveyor burial prevention retaining wall economically.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a plurality of columns are driven along the belt conveyor to the ground on both sides or one side of a belt conveyor installed in a yard where iron ore, coal, crushed stone, etc. are piled up. In a conveyor burying prevention retaining wall having a wall between the columns, the wall is composed of a concrete plate and a wooden plate provided on the concrete plate. It is desirable that the height ratio of the concrete board and the wood board be 1 to 10.

[0008]

1 is a sectional view of an embodiment of the present invention in which retaining walls are arranged on both sides of a belt conveyor, and FIG. 2 is a front view of FIG. 1. In FIGS. 1 and 2, a belt conveyor 4 is shown.
In the place where a certain distance is left from the belt conveyor 4 on the yard side of, the pillars 3 made of metal or reinforced concrete are driven into the ground at appropriate intervals along the belt conveyor 4, and the concrete plate 2 is fixed to the lower part between the pillars. , The wood board 1 is fixed to the upper part of the board to form a retaining wall.

FIG. 3 is an explanatory view of a bending moment and a deformation curve of the column in a static state, and FIG. 4 is a bending moment generated in the column by a dynamic impact force at the time of landslide in a conventional retaining wall structure. And in the explanatory diagram of the deformation, by supporting the iron ore that collapsed from the yard side with the retaining wall,
As shown in FIG. 3, a bending moment b and a deformation c occur on the column 3. At this time, the bending moment generated at the depth lm1,1 from the ground surface becomes zero in the soil part of the pillar 3, but this lm1,1 is a value determined by the ground strength, the rigidity of the pillar 3, and the magnitude of the load. Generally, when the rigidity and the acting load of the support column 3 increase, lm1,1 also increases.

Therefore, as shown in FIG. 4, in the conventional retaining wall structure, since the retaining wall and the pillars 3 are installed so as not to be destroyed or collapsed against the dynamic impact force when the landslide occurs, As the rigidity of the supporting column 3 increases with increasing, lm1 and lm2 have a larger value than lm1,1 and not only the cross section of the supporting column 3 increases but also the length increases.
The result is an expensive structure.

FIG. 5 is an explanatory view of a calculation example of absorbed energy and generated reaction force of a wooden board and a concrete board having the same cross-sectional area,
FIG. 6 is an explanatory view that the pushing force acting on the retaining wall is reduced when the wooden board is broken. As shown in FIG. 5, in the present invention, the reaction force can be made smaller than that of the concrete board by the energy absorption due to the deformation of the wooden board. It is possible to reduce the reaction force that acts on the column 3.

Further, as shown in FIG. 6, when impact energy exceeding the absorbed energy acts, the upper wooden board 1
The iron ore that has collapsed due to the destruction of the steel flows over the upper part of the concrete plate 2, and the acting height of the pushing force acting on the retaining wall becomes low, so that the pushing force applied to the pillar 3 is pushed up to the pushing force curve aaa. It can be reduced. From this, the present invention requires less burden on the support column 3 than the conventional retaining wall structure, and thus the rigidity of the support column 3 can be reduced, and the length of the support column 3 embedded in the soil is lm1 against the dynamic extrusion force aa. Since it is possible to adopt a value lm1,1 or lm1,3 smaller than 2, 2, it is possible to reduce the length of the column 3 as compared with the conventional retaining wall structure.

Further, since the upper wooden board 1 is light in weight, the length of the support column 3 is short, and the cross section thereof is small, the weight of the wall body is also reduced and the problem due to sinking can be ignored.

FIG. 7 shows a concrete board (b) and a wooden board (a).
FIG. 7 is an explanatory diagram of the ratio of the outflow amount to the total collapse amount due to the change in the height ratio (b / a) of the concrete board (b / a), as shown in FIG. In a), if the ratio is less than 1, the outflow rate will be very high, and it will be costly to process the outflow, and if it exceeds 10, the outflow rate can be greatly suppressed but it is necessary to strengthen the structure. Not only will the cost be high, but problems due to subsidence will also occur, so
It is preferably set to 10.

[0015]

【The invention's effect】

(1) Since the reaction force against the impact energy at the time of landslide can be reduced, the strength of the wall body only needs to consider a small amount of the dynamic pushing force, and the length of the supporting column is short, and it is economically used for a long time. It becomes possible.

(2) Even if the wooden board is damaged, the concrete board blocks the outflow of the deposit, so that the outflow amount of the deposit can be reduced.

(3) A wall body that can be used for a long period of time at a lower cost than metal and the like with corrosion countermeasures by making the area in constant contact with piled iron ore etc. with concrete having high weather resistance and corrosion resistance Is possible.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention in which retaining walls are arranged on both sides of a belt conveyor.

FIG. 2 is a front view of FIG.

FIG. 3 is an explanatory diagram of a bending moment and a deformation curve of a column generated in a column in a static state.

FIG. 4 is an explanatory diagram of a bending moment and a deformation generated in a support column by a dynamic impact force at the time of landslide in a conventional retaining wall structure.

FIG. 5 is an explanatory diagram of a calculation example of absorbed energy and generated reaction force of a wooden board and a concrete board having the same cross-sectional area.

FIG. 6 is an explanatory diagram showing that the pushing force acting on the retaining wall at the time of breaking the wooden board is reduced.

FIG. 7 is an explanatory diagram of the ratio of the outflow amount to the total collapse amount due to the change in the height ratio (b / a) of the concrete plate and the wooden plate.

[Explanation of symbols]

 1 Wood board 2 Concrete board 3 Pillar 4 Conveyor

Claims (2)

[Claims] 1. A plurality of columns are driven along the belt conveyor into the ground on both sides or one side of a belt conveyor installed in a yard where iron ore, coal, crushed stone, etc. are piled up, and a wall is provided between the columns. A conveyor burying prevention retaining wall having a body, wherein the wall body is composed of a concrete plate and a wooden board provided on the concrete plate. 2. The ratio of the height of the concrete board to the height of the wooden board is 1 to
10. The conveyor burying prevention retaining wall according to claim 1, wherein the retaining wall is 10.