JP7064985B2 - Waste landfill press-fitting disposal method - Google Patents

Description

The present invention relates to a press-fitting disposal method for a waste landfill ground filled with waste such as coal ash.

For example, as a compaction pile method for burying coal ash by penetrating a hollow pipe into soft sandy ground, the one disclosed in Patent Document 1 is known. In the soft sandy ground improvement method described in Patent Document 1, coal ash produced from a coal-fired power plant or the like as a filling material for compaction piles, which has not yet reacted with water, is buried.

Japanese Unexamined Patent Publication No. 9-53227

However, in the conventional soft sandy ground improvement method, the target of the ground improvement is the soft sandy ground, and the diameter of the coal ash pile (pile) to be formed is the same regardless of the depth, so that the ground is soft. In order to increase the processing amount of coal ash injected into the sandy ground through the hollow pipe, it is necessary to reduce the casting pitch of the coal ash pile. It appeared on the surface and needed to be disposed of.

Therefore, the present invention has been made to solve the above-mentioned problems, and it is possible to increase the amount of waste press-in treatment into the waste landfill board and reduce the occurrence of the amount of swelling on the ground surface. The purpose is to provide a waste landfill press-fitting disposal method that can be used.

The present invention is a waste landfill press-fitting disposal method in which a waste that has been temporarily placed in a waste landfill board after removing lumps is used as a filling material for a compaction pile, and a hollow pipe is provided in the waste landfill board. It is characterized in that the waste is press-fitted into a plurality of steps having a larger diameter toward the deeper part of the construction depth and a smaller diameter from the deep part to the shallow part .

According to the present invention, the waste obtained by removing lumps from the waste landfill through a hollow pipe has a large diameter toward the deeper part of the construction depth and a smaller diameter from the deep part to the shallow part. By press-fitting and placing the waste so as to be, the amount of waste press-fitted into the waste landfill board can be increased, and the amount of swelling on the ground surface can be reduced. As a result, efficient press-fitting landfill processing can be performed.

It is a schematic diagram which shows the waste landfill press-fitting disposal method of one Embodiment of this invention. It is explanatory drawing which compares each construction by the above-mentioned waste landfill press-fitting disposal method. It is explanatory drawing which shows the relationship between the casting pitch and the swelling rate by the above-mentioned waste landfill press-fitting disposal method. It is explanatory drawing which shows the relationship between the press-fitting rate and the swelling rate of the casting by the above-mentioned waste landfill press-fitting disposal method.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing a waste landfill press-fitting disposal method according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing a comparison of each construction by the improved construction method, and FIG. 3 is a casting pitch and filling by the improved construction method. An explanatory diagram showing the relationship between the climb rate and FIG. 4 is an explanatory diagram showing the relationship between the press-fitting rate and the rise rate of the casting by the improved construction method.

As shown in FIGS. 1 and 2, the waste landfill injection disposal method of this embodiment is a coal ash landfill ground (waste landfill) filled with coal ash (waste) 3 produced from a coal-fired power plant or the like. Using the coal ash 3 of the discharged ash temporarily placed in the temporary storage place 2 of the ground) 1 as the filling material of the compaction pile (CP), the casing pipe (hollow pipe) is used in the coal ash landfill board 1 by the SCP construction machine 10. ) 11 is a sand compaction pile (SCP) method of penetrating and placing. That is, the coal ash 3 piled up in the temporary storage place 2 is carried into the construction site by the truck 15, and the brought-in coal ash 3 is press-fitted into the coal ash landfill board 1 through the casing pipe 11 to insert the casing pipe 11. The coal ash 3 is injected into the coal ash landfill board 1 while the coal ash piles (coal ash piles) 5, 5'are formed by backing up. The region where the coal ash 3 has been press-fitted is indicated by reference numeral 6 in FIG.

In this case, as shown in FIG. 1, the casing pipe 11 has a shape in which the pull-out resistance is small, that is, the shape of the tip 11a of the casing pipe 11 is a protrusion whose resistance is small when the casing pipe 11 is pulled out. Use a shape with few objects (for example, a straight with a diameter φ of φ = 500 mm), and inject the amount of coal ash 3 into the coal ash landfill board 1 via the casing pipe 11 according to the construction depth. Change and place.

That is, as shown in [Main construction] of FIG. 2, the deeper the construction depth, the larger the press-fitting amount of the coal ash 3 is, and the lower side has a large diameter (diameter φ corresponds to, for example, φ = 900 mm) and the middle side has a medium diameter (diameter). A coal ash pile 5 is formed in a stepped shape with φ (equivalent to φ = 800 mm) and a small diameter on the upper side (diameter φ is equivalent to φ = 700 mm), or as shown in [Another construction] in FIG. Double-fitting is performed twice at the same depth to create a coal ash pile 5'with a large diameter (diameter φ corresponds to, for example, φ = 900 mm). As a result, the amount of deep coal ash 3 press-fitted can be increased, so that the coal ash pile 5 ″ has a standard diameter (diameter φ corresponds to, for example, φ = 700 mm) shown in [conventional construction] in FIG. The press-fitting process amount of 3 can be significantly increased.

Further, as shown in the A portion of FIG. 3 and the B portion of FIG. 4, it can be seen that the rise rate does not change significantly even if a large amount of coal ash 3 is pressed into one place. Further, the press-fitting amount is increased in the deep part where the effect of the rise due to the press-fitting is small, and the conventional press-fitting amount is used in the shallow part where the effect of the press-fitting is large. The coal ash 3 used in this method is fly ash (new coal ash) or clinker ash, and lump coal ash removed from the mixed ash.

According to the waste landfill press-in disposal method of this embodiment, in the one-time construction by the SCP construction machine 10, the press-fit amount of the coal ash 3 is changed according to the construction depth and the coal ash 3 is placed in FIG. As shown, the amount of the coal ash 3 press-fitted into the coal ash landfill board 1 can be increased, and the amount of swelling of the ground surface of the coal ash landfill board 1 can be reduced. For example, in the case of [another construction] shown in FIG. 2, the press-fitting disposal amount can be increased by about 1.6 times as compared with the case of [conventional construction] shown in FIG. 2, and coal ash landfill. The amount of swelling of the ground surface of the ground 1 can be made equal. As a result, efficient press-fitting landfill processing can be performed.

Further, as shown in FIG. 3, in the conventional construction, if the casting pitch is narrowed, the rising rate (raising amount) of the ground surface of the coal ash landfill board 1 increases, but the casting pitch is the same as in the conventional construction. Therefore, when this construction is carried out, the amount of coal ash 3 press-fitted into the coal ash landfill board 1 can be significantly increased, but the rise rate (rise) of the ground surface of the coal ash landfill board 1 The amount) can be set to a swelling rate (swelling amount) that is almost the same as in the case of conventional construction.

Further, as shown in FIG. 4, the reason why the swelling rate does not increase sharply as in the conventional construction even if the press-fitting rate of this construction increases is that the shape of the tip 11a of the casing pipe 11 has a small pull-out resistance. This is also because the swelling rate (swelling amount) of the swelling ash 4 on the surface layer portion of the coal ash landfill board 1 can be suppressed as compared with the conventional construction.

Further, in the coal ash landfill board 1 made of a highly compressible material such as coal ash 3, it is possible to press in a large amount of coal ash 3 while suppressing the deformation of the surrounding ground as the deeper part is more restrained. Further, by managing the press-fitting amount of the coal ash 3 with a dedicated construction management instrument, it is possible to perform reliable construction and accurately manage the processing amount of the coal ash 3.

In addition, since the coal ash 3 piled up in the temporary storage site 2 of the coal ash landfill board 1 can be reused as a filling material for the coal ash piles 5, 5', the life of the existing ash waste land in the thermal power plant is extended. It will be a countermeasure. That is, since the coal ash 3 temporarily placed and piled up in the thermal power plant can be used as a filling material for the coal ash piles 5, 5', the generated soil can be reused locally (zero emission). It can greatly contribute to the surrounding environment and cost.

According to the above embodiment, coal ash is used as the waste, but other waste such as concrete material may be used, and the target of press-fitting is not limited to the coal ash landfill ground, but soft sandy ground and the like. Other ground may be used.

Further, according to the above-mentioned embodiment, fly ash or clinker ash and a mixed ash thereof are used as the filling material of the compaction pile, and a modified material such as quicklime is added to the mixed ash. It may be used as a filling material.

1 Coal ash landfill board (waste landfill board)
3 Coal ash (waste) 3
5,5'Coal ash pile (compaction pile)
11 Casing pipe (hollow pipe)
11a Tip (shaped with low pull-out resistance)

Claims (4)

This is a waste landfill press-fitting method that uses waste that has been temporarily placed on a landfill board as a filling material for compaction piles.
The waste is press-fitted into the waste landfill board through a hollow pipe so as to form a multi-step step having a larger diameter toward the deeper part of the construction depth and a smaller diameter from the deep part to the shallow part. A waste landfill press-fitting disposal method characterized by placing. The waste landfill press-fitting disposal method according to claim 1.
A waste landfill press-fitting disposal method characterized in that a hollow tube having a tip shape having a small pull-out resistance is used. The waste landfill press-fitting disposal method according to claim 1 or 2 .
As the waste, the coal ash temporarily placed in the coal ash landfill after removing the lumpy coal ash is used as the filling material of the compaction pile, and the coal ash is placed in the coal ash landfill through the hollow pipe. A waste landfill press-fitting disposal method characterized in that the deeper the depth of construction, the larger the diameter, and the smaller the diameter from the deeper part to the shallower part, the smaller the diameter is . The waste landfill press-fitting disposal method according to claim 3 .
A waste landfill press-fitting disposal method characterized in that fly ash is used as the coal ash.

Images