JP3470977B2 - Landfill method using incinerated ash - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a landfill method using incinerated ash. [0002] Ash generated after incineration of municipal waste and the like is sometimes used as a building material by melting a small part of the ash. Has been dumped. [0003] However, incineration ash is generated in large quantities, and at present the disposal site is in short supply. Ash also contains harmful substances, and simply burying it may damage the surrounding environment. Furthermore, ash is difficult to handle, and it takes time to spread and compact. Further, landfills often have soft foundations, and large land subsidence occurs over a long period of time, making it difficult to quickly use the site. In addition, the cost of revetment work around the landfill increases. The present invention has been proposed in view of the problems of the prior art described above, and the object thereof is to enable a large amount of incinerated ash to be compactly and efficiently landfilled, suppress land subsidence, and facilitate the use of the site. The aim is to provide a landfill method using incinerated ash that can reduce the cost of revetment work around the landfill. [0005] To achieve the above object, according to the landfill method using incinerated ash according to the present invention, water
By laying steel pipe piles along the periphery of the above-mentioned landfill site to construct a revetment , the water surface in the above-mentioned landfill site is closed
In addition, air bubbles are mixed into the incineration ash with water and a small amount of cement added and mixed, and the mixed amount of the air bubbles is adjusted to produce air milk with a specific gravity of almost 1, and the air milk is impermeable to air. Enclosed in a bag and filled with the air milk
Landfill is done by laying and stacking on the surface of the water in the landfill site . [0006] As described above, according to the present invention, in the steel pipe pile group the water surface of the water reclaimed planned site to construct a revetment by pouring the steel pipe pile along the periphery of the water reclamation planned site deadline, the water enclosed in the steel pipe pile group, a bubble in a mixture by adding water and a small amount of cement to ash lined laid impermeable bag encapsulating Eamiruku you entered mixed, to stack so that Therefore, the incinerated ash is solidified with cement and placed in an impermeable bag, so that no harmful substances contained in the incinerated ash are eluted. Also, the Eamiruku solidifies in impermeable bags, ground with sufficient strength is Construction. [0007] The specific gravity of the air milk is determined by lake water and river water.
Landfill due to landfill does not occur at all because it is almost equal to the specific gravity of river water, seawater, etc. Therefore , land use after landfill is completed is performed promptly. The present invention will be described below with reference to an embodiment shown in the drawings. The steel pipe pile 1 Da設along the peripheral edge of the water landfill planned site,
Construct a revetment and close off the water surface in this landfill site
( See FIG. 1) . In addition, in the example shown
The land is a planned land reclamation site, and the water surface is the sea surface. Then, the bagged air milk 2 in which air milk is sealed in a water-impermeable bag such as vinyl chloride is arranged on the sea surface in the seawall made of steel pipe piles , so that the bag packed air milk 2 is placed on the water.
(Offshore) Arrange on the water surface (sea surface) in the landfill site
( See FIG. 2) . 3 in the figure is the foundation ground. [0009] The following are examples of formulating the above-mentioned air milk (a) Cement usage 20% of incinerated ash (weight ratio) (b) Water usage 90% of total weight of ash and cement (weight ratio) (c) 30% (volume ratio) of air bubbles mixed The mixture was subjected to accelerated curing at 40 ° C. for 2 days. As a result, 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 lower layer bagged air milk 2 is brought into contact with the foundation ground 3,
Stacking until reaching a predetermined height completes the landfill.
(See FIG. 4) Thus, the specific gravity of the air milk is substantially equal to 1 and equal to seawater. Therefore, when the landfill is completed, the load acting on the foundation ground 3 is substantially equal to the water pressure initially applied by the seawater. Therefore, no land subsidence occurs. [0011] As described above, according to the present invention, the revetment building the steel pipe pile by pouring along the periphery of the water filled <br/> elevational planned site water in the water reclaimed planned site the Shimeki Ri, this
The water in the water landfill planned site, incineration ash Tile laying impermeable bag encapsulating Eamiruku entrained bubbles as specific gravity in a mixture by adding water and a small amount of cement is approximately 1, are stacked Tsu and is obtained by the performed landfill, solidified Eamiruku has sufficient strength, to self, be small soil pressure acting around the steel pipe pile, also the need of watertightness in revetment Therefore, the cost of revetment work can be significantly reduced, and the incinerated ash solidifies in an impermeable bag, so that harmful substances do not elute and damage the surrounding environment. According to the present invention, the incinerated ash can be changed to a form that is easy to handle and landfilling can be facilitated. Also, since the specific gravity of the air milk is equal to that of seawater, no land subsidence occurs, and the air milk can be pumped. Because pumping is possible,
Workability is further improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a step of forming a seawall with a steel pipe pile at a landfill site in a landfill method using incinerated ash according to the present invention. FIG. 2 is a longitudinal sectional view showing a step of arranging bagged air milk on the sea surface. FIG. 3 is a longitudinal sectional view showing a step of gradually stacking bagged air milk. FIG. 4 is a longitudinal sectional view showing a state at the time of completion of landfill. [Description of Signs] 1 steel pipe pile 2 bagged air milk 3 foundation ground

Claims (1)

(57) Patent Claims 1 With pouring the steel pipe pile along the periphery of the water reclamation planned site to construct a revetment, the water reclamation planned site in
The water surface is closed, air bubbles are mixed into a mixture obtained by adding water and a small amount of cement to the incinerated ash, and the mixed amount of the air bubbles is adjusted to produce an air milk having a specific gravity of almost 1, and the air milk is immiscible. Enclosed in a water-permeable bag and laid the airbag packed in the bag on the surface of the water landfill site ,
A landfill method using incinerated ash, characterized by stacking and landfilling.