JPH0734430A - Reclamation using burned ash - Google Patents

Abstract

PURPOSE:To reduce construction cost and prevent the sinking of ground by arraying burned ash mixture packed in bags, of specified specific gravity, inside steel pie piles placed along periphery of a planned site for reclamation. CONSTITUTION:Steel-pipe piles 1 are placed along periphery of a planned site for reclamation, so that the revetment is made and the site is enclosed. Bubble is mixed to a mixture of incineration ash and water and small quantity of cement. The quantity of bubble added is so adjusted that specific gravity of the mixture becomes nearly 1. This air milk is then sealed in water impermeable bags. These air milk filled bags 2 are arrayed on sea surface within the revetment of steel-pipe piles. Air milk filled bags 2 are piled up on others, so that the air milk filled bags 2 in the lower layer reach to ground foundation 3 and the piling finally gets to a specified height. The air milk in water impermeable gas solidifies, becoming sufficient strength. Accordingly, because earth pressure to the steel-pipe piles is small and watertightness is not required of the revetment, the cost can be reduced, and besides, outflow of harmful matter is prevented. Since specific gravity of the air milk is the same as seawater, ground sinking is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a landfill method using incinerated ash.

[0002]

2. Description of the Related Art The ash generated after incinerating municipal solid waste may be used as a building material by melting a small part of it, but most of it is discarded as waste and dumped at an appropriate disposal site. There is.

[0003]

However, the current situation is that a large amount of incinerated ash is generated and the disposal site is insufficient. In addition, ash also contains harmful substances, and simply landfilling may damage the surrounding environment. Furthermore, ash is difficult to handle, and it takes time and effort to spread it and roll it.

Furthermore, in the reclaimed land, the foundation ground is often soft, and large ground subsidence occurs over a long period of time, which makes it difficult to quickly use the land. In addition, the cost of revetment work around the landfill increases. The present invention has been proposed in view of the problems of the above-mentioned conventional technology, and the purpose thereof is to enable a large amount of incinerated ash to be compactly and efficiently landfilled, to suppress ground subsidence and to easily use the site. The purpose is to provide a landfill method using incinerated ash that can reduce the construction cost of the revetment work around the landfill.

[0005]

In order to achieve the above object, according to the landfill method using incinerated ash according to the present invention, a steel pipe pile is driven along the periphery of the planned landfill site to construct a seawall. Then, add air and a small amount of cement to the incineration ash and mix air bubbles, and adjust the amount of air bubbles mixed to produce air milk with a specific gravity of approximately 1, and make the air milk impermeable. The bag is sealed in a bag, and the air milk packed in the bag is laid in the steel pipe pile for landfilling.

[0006]

According to the present invention, as described above, a seawall is constructed by placing steel pipe piles along the periphery of the planned landfill site, and the planned landfill site is closed by the steel pipe pile group and surrounded by the steel pipe pile group. In the part, the incinerated ash, water and a small amount of cement were added and mixed so that a water-impermeable bag containing air milk mixed with air bubbles was placed in a line, so that the incinerated ash was solidified with cement, Moreover, since it is placed in a water-impermeable bag, harmful substances contained in the incinerated ash do not elute. Further, the air milk is solidified in the water impermeable bag, and the ground having sufficient strength is formed.

Moreover, since the specific gravity of the air milk is almost equal to the specific gravity of seawater, no ground subsidence occurs. For this reason, the site will be used promptly.

[0008]

The present invention will be described below with reference to the illustrated embodiments. Steel pipe piles 1 are placed along the periphery of the planned landfill site to construct a revetment and close the planned landfill site. (See FIG. 1) Next, the bag-filled air-milk 2 in which air-milk is sealed in a water-impermeable bag such as vinyl chloride is arranged on the sea surface inside the revetment made of steel pipe piles. (See FIG. 2) In the figure, 3 is the foundation ground.

[0009] Next, examples of blending the above-mentioned air milk will be given. ) Amount of air bubbles mixed 30% (volume ratio) When accelerated curing was carried out at 40 ° C for 2 days with the above composition, a compressive strength of 6 kg / cm ² was obtained.

The specific gravity was 1.03. Next, the bagged air milk 2 is gradually stacked (see FIG. 3), and the bagged air milk 2 in the lower layer is contacted with the foundation ground 3,
The landfill is completed by stacking until reaching a predetermined height.
(Refer to FIG. 4) Thus, the specific gravity of the air milk is almost 1 and equal to seawater. Therefore, when the landfill is completed, the load acting on the foundation ground 3 is almost equal to the water pressure initially exerted by seawater. Therefore, subsidence does not occur at all.

[0011]

According to the present invention, as described above, water and a small amount of cement are added to incinerated ash at the portion closed by the seawall constructed by placing steel pipe piles along the periphery of the planned landfill site. It is designed to be landfilled by laying impermeable bags containing air milk mixed with air bubbles so that the specific gravity of the mixed milk becomes almost 1, and the solidified air milk has sufficient strength and is self-supporting. Therefore, the earth pressure acting on the surrounding steel pipe piles is small, and the revetment does not need watertightness, so the cost of revetment work can be greatly reduced, and the incineration ash is impermeable. It will not solidify in the bag and elute harmful substances and will not damage the surrounding environment.

According to the present invention, the incineration ash can be changed into a form that can be easily handled to facilitate landfill disposal. Further, since the specific gravity of the air milk is equal to that of seawater, ground subsidence does not occur, and the air milk is pumped. Since it can be pumped,
Workability is further improved.

[Brief description of drawings]

FIG. 1 is a plan view showing a process of constructing a revetment with steel pipe piles at a planned landfill site in a landfill method using incinerated ash according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a step of arranging bagged air milk on the sea surface.

FIG. 3 is a vertical cross-sectional view showing a step of gradually stacking bagged air milk.

FIG. 4 is a vertical sectional view showing a state after completion of landfill.

[Explanation of symbols]

 1 Steel pipe pile 2 Packed air milk 3 Foundation ground

Claims (1)

[Claims] 1. A seawall is constructed by driving steel pipe piles along the periphery of the planned landfill site, and mixed with water and a small amount of cement added to the incinerated ash to mix air bubbles, and the inclusion of the air bubbles. It is characterized in that the amount is adjusted to produce air milk having a specific gravity of approximately 1, the air milk is enclosed in a water impermeable bag, and the air milk packed in the bag is laid in the steel pipe pile and landed. Landfill method using incinerated ash.