JPH039000A - Reclamation work for waste pit - Google Patents

Abstract

PURPOSE:To safely construct a reclamation layer by the combined use of properly treated wastes and ready-mixed concrete as reclamation materials. CONSTITUTION:A ready-mixed concrete A is obtained by mixing cement with inorganic wastes such as cinders, sludges, mineral slags, etc., and cubic compressed solids B are obtained from waste plastics, waste rubbers, etc. Pressed wastes C are also obtained from waste metals, waste glass, waste ceramics, etc., for reclamation. In the case of underground spaces which workers are hard to enter, the solids B are arranged into a matrix form at a given interval and concrete A is placed to a laminate layer. Also, the wastes C and the concrete A may be compressed together to form a laminate layer. The reclamation layer having high strength and high uniformity can thus be safely constructed.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Field of Industrial Application) The present invention provides a method for reclaiming abandoned mines such as stone quarries safely and stably using waste and cement as materials. Regarding construction methods.

(Prior circumstances and technology) In March of this year, there was the largest cave-in accident at the former mining site (hereinafter referred to as "the abandoned mine") at the Oya Stone Quarry in Utsunomiya City, Tochigi Prefecture, the applicant's hometown. Although the disaster did not reach this level, there is still a risk that it will spread and reoccur, and not only the disaster victims but also surrounding residents are continuing to relocate.

The cause of the cave-in is said to be excessive digging that ignored permission, but regardless of who is responsible, as a temporary measure,
The public and private sectors are jointly considering reclamation methods for not only the sinkhole but also the dangerous surrounding abandoned mines. However, various opinions were expressed, such as ``only five stable items should be buried with industrial waste'' and ``filling with water will make it stronger.''
The current situation is such that it is difficult to reach a definitive conclusion, due to complex issues such as how to do so, the cost burden, and the consent of mining companies and landowners adjacent to the sinkhole.

Until now, there is almost no established theory regarding the reclamation of abandoned mines, and from backfilling with mining scraps and earth to, more recently, indiscriminate dumping of industrial waste, each type of reclamation has been carried out in a haphazard manner. Currently, there are no guarantees regarding the quality of waste, and depending on the waste, hazardous substances may be leached or gasified, causing environmental pollution problems.

(Problems to be Solved by the Present Invention) Based on the knowledge and experience gained from many years of research and practical experience in waste treatment, the present inventor has developed a method for reclamation of abandoned mines as described above. The aim is to provide a comprehensive reclamation method that guarantees safety and stable strength through proper treatment of each type and use in combination with ready-mixed concrete.

[Structure of the invention] The following will explain the process flow sheet using an example of a drawing. First, waste and ready-mixed concrete will be used as the embedding materials, and a ready-processed concrete plant and a waste compression and solidification plant will be provided. . The geographical conditions for installation would be near an abandoned mine.

As shown in Figure 1, in ready-processed concrete plants, waste materials such as cinders, sludge, slag, and dust that meet the criteria for inorganic and hazardous waste (Prime Minister's Office Ordinance No. 5) are targeted. , one or more of them are blended with cement to produce treated fresh concrete A. Various blending ratios can be considered, but for example, the following weight ratios may be used.

a. Sludge 3.5 b. From combustion 3.5 C. Cement 1°d. Appropriate amount of coagulant (Heton) Next, in the waste compression solidification plant, as shown in Figure 2, waste treatment is carried out. Among the stable items stipulated by the law regarding cleanliness and cleaning, polymer waste plastics and rubber scraps are compressed using a high-pressure compressor to produce a solid compressed product in the form of a regular cube of a predetermined size. Form into B. Although the size is arbitrary, a regular cube with a side of 1.5 m or less is desirable because of the necessity of transporting and arranging them in the mine shaft.

Note that among the stable items mentioned above, there are items that are difficult to compress and solidify, such as metal scraps, glass scraps, and ceramic scraps, but these will be transported to the abandoned mine site as is and used as compressed waste material C.

Now, the above-mentioned processed fresh concrete A, solid compacted material B5 and compressed waste material C are brought to the abandoned mine site by freight cars and mixer trucks as landfill materials.

Then, as shown in FIG. 3, underground cavities that are dangerous for workers to enter are filled with the treated raw concrete A by being pumped and injected into the bored holes and solidified.

Next, in the abandoned mine where the workers enter, (a) As shown in Figures 4 to 6, the solid compacted material B is arranged in a square shape with gaps at predetermined intervals vertically and horizontally, and The treated raw concrete A is poured into the gap, and the solid compacted material B is leveled until it is buried to form a concrete layer of a predetermined thickness, and the concrete layer is repeatedly stacked on top of the concrete layer for landfill. It goes without saying that as a result, a part of the treated fresh concrete A penetrates into the gaps of the solid compressed material B itself and is solidified.

In this case, as shown in FIGS. 4 and 6, the number of solid wastes arranged vertically and horizontally is determined, and a predetermined gap is placed between the blocks as a unit of collection, and the treated ready-mixed concrete A is placed in the gap between the blocks. If the structure is such that reinforcing columns are formed by pouring the reinforcing columns, the stable strength can be significantly increased in cooperation with the remaining columns.

(b) As shown in Fig. 7, the compressed waste material C at the site is transported and supplied into the abandoned mine and compressed by a puller or the like to form a compressed waste layer of a predetermined height. The raw treated concrete 1.A is poured on top to form a concrete layer of a predetermined thickness, and the concrete layer is piled up one after another over the concrete layer to perform landfilling.

[Operations and Effects] As described above, the present invention properly processes waste materials for landfill by type (i.e., converts them into ready-mixed concrete, compacts them, or directly uses them as compressed materials on site), and converts them into abandoned mines. First, the work can be carried out extremely efficiently, as it uses a high-pressure pump and a lifting drive to transport, pour, solidify, and bury the waste into an abandoned mine.

Second, work safety is high.

Third, by converting cinders, sludge, slag, and dust into ready-processed concrete and assimilating it, we convert secondary pollution, that is, water-soluble substances, into harmless insoluble substances and prevent pollution (elution test results, measurement certificates). (see) to achieve stable strength.

Fourthly, due to the compression and solidification of polymeric waste, materials that are not strong enough to provide stable support when trampled, etc. condense and increase density, and furthermore, raw concrete A is poured into the gaps. Significantly increases its own strength through penetration and assimilation.

Fifth, in addition, raw treated concrete 1-A is poured into the gaps between the arrays of compressed solid materials B, solidified, and then stacked in many layers to ensure strong and uniform stability. This allows us to fully prepare for disasters such as earthquakes.

Sixth, metal scraps, crow scraps, ceramic scraps, etc.
It is used as it is as compressed waste material C at the site of an abandoned mine, and the treated ready-mixed concrete A is poured on top of it to form a concrete layer of a predetermined thickness, which is then repeatedly stacked on top of the concrete layer for landfilling, so it is as strong as the fifth material. Moreover, uniform stability can be ensured, and it can be sufficiently prepared against disasters such as earthquakes.

As described above, the present invention can prevent cave-in accidents by implementing it not only in cave-ins and surrounding abandoned mines, but also in general abandoned mines.

The construction of a modern plant as described above not only ensures the practical safety of the mining site, but also serves as a psychological symbol of safety for workers and surrounding residents.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, Fig. 1 is a process flow sheet for a ready-processed concrete plant, Fig. 2 is a process flow sheet for a waste compaction solidification plant, and Fig. 3 is a process flow sheet for a waste compaction plant that does not allow workers to enter. Fig. 4 is a longitudinal side view showing the working conditions in the abandoned mine; Figure 4 is a longitudinal side view showing the working condition in the abandoned mine; Fig. 5 is a vertical side view showing the working condition in the abandoned mine; Figure 6 is a perspective view of the state in which ready-treated concrete is being poured, Figure 6 is a cross-sectional plan view taken along the line X-X in Figure 4, and -10- Figure 7 is a vertical cross-section showing another working state in the abandoned mine where workers are entering. Side view. Processed raw concrete 1., 1. Solid pressure linear motion, 1. Compressed waste material.

Claims (1)

[Scope of Claims] 1) Waste and ready-mixed concrete are used as materials, and the waste includes incineration, sludge, slag, and dust that meet the criteria for inorganic and hazardous waste (Prime Minister's Office Ordinance No. 5). One or more of these are mixed with cement to produce treated ready-mixed concrete A. Among the stable items stipulated in the Waste Disposal and Public Cleansing Act, polymer waste plastics and rubber scraps are is compressed under high pressure to form a compressed solid material B into a cube of a predetermined size, and materials that are difficult to compress and solidify, such as metal scraps, glass scraps, and ceramic scraps, are compressed as waste materials at the abandoned mine site. In dangerous underground cavities where workers cannot enter, the treated ready-mixed concrete A is pumped and injected into the bored hole and solidified to fill it up, and in abandoned mines where workers can enter, (b) The compressed solid material B is arranged in a square shape with gaps at predetermined intervals vertically and horizontally, and the treated ready-mixed concrete A is poured into the gaps, and then leveled until the compressed solid material B is buried. (b) Alternatively, the compressed waste material C at the site is transported and supplied into the abandoned mine and compacted to form a compressed waste layer of a predetermined height. An abandoned mine reclamation method, characterized in that the treated ready-mixed concrete A is poured thereon to form a concrete layer of a predetermined thickness, and the concrete layer is sequentially and repeatedly stacked above the concrete layer to perform the reclamation. 2) The abandoned mine reclamation method according to claim 1, in which a cement coagulant is mixed into the treated fresh concrete A. 3) A patent claim in which the number of compressed solid materials B arranged vertically and horizontally is determined, the aggregate unit is one block, a predetermined gap is provided between the blocks, and a reinforcing column is constructed by pouring the treated ready-mixed concrete A into the gap. Abandoned mine reclamation method described in item 1.