KR20080098997A - Underground cavity carrying out method using aerated concrete including bottom ash - Google Patents

Abstract

An underground cavity portion reclaiming construction method is provided to prevent the land subsidence due to the collapse of the abandoned mine underground cavity portion. An underground cavity portion reclaiming construction method comprises following steps: a step for punching the filler(20) injection hole(13) till the underground cavity portion(11) from the top of the abandoned mine(10); a step for punching independently of the filler injection hole from the top of the abandoned mine to the underground cavity portion confirmation ball(14); a step for charging the underground cavity portion of the abandoned mine that the filler consisting of the aerated concrete including the bottom ash is charged through the filler injection hole.

Description

Underground Cavity Carrying Out Method Using Aerated Concrete Including Bottom Ash}

1 is a schematic view showing a construction method according to the present invention, showing a state of injecting a filler through the injection hole by drilling the injection hole and the confirmation hole.

2 is a schematic view showing a construction method according to the present invention, showing a state of filling the tunnel.

* Explanation of Signs of Major Parts of Drawings *

10: abandoned mine

11: underground cavity

12: tunnel

13: injection hole

14: confirmation ball

15: bulkhead

20: filling material

30: pump pumping device

40: pressure feed pipe

41: injection hose

42,43 support

The present invention relates to a method for landfilling underground cavities using aerated concrete including bottom ash, and more specifically, to the inside of underground cavities with fillers made of aerated concrete including bottom ash, a by-product generated from thermal power plants. By charging, it is possible to prevent landfill shortages around the power plant and environmental damage.

As is well known, domestic coal ash production continues to increase, and over 6 million tonnes are emitted annually. The finely divided pulverized coal generated after combustion in the boiler of the thermal power plant is burned and discharged from the boiler together with the flue gas and collected at the bottom of the dust collector. The ash at this time is called fly ash and is dropped to the bottom of the boiler. Bulky or large particles of ash are called bottom ash.

Here, the areas where coal ash is recycled use high-quality fly ash, and bottom ash, which accounts for 10-20% of coal ash, is almost never recycled and is buried in an ash pond near a power plant. Is struggling to secure land around power plants and causes environmental pollution.

For the purpose of recycling the bottom ash, the method of using it as concrete aggregate in Korea or as a concrete secondary product and low strength and high flow filler is being reviewed. Because of this variety, there is still a need for a lot of studies to use it stably, it is difficult to draw large-scale consumption, there is a problem that requires a stimulant treatment process for activating it.

On the other hand, the research direction on the countermeasures against mines (wastewater, waste-rock and tailings) in the abandoned mine area of the developed countries is somewhat different from the method envisioned for the treatment of waste mines in Korea. This is because the development method is fundamentally different. Since advanced countries adopt the rechargeable mining method, the amount of wastewater discharged or the amount of ore released to the outside is smaller than the mine size.

However, in the case of the simple mining method, as in the case of Korea, the ground remains intact, and ground subsidence due to the collapse of the underground cavity is seriously concerned.

In addition, since the 1989 coal industry rationalization project, which cleans up coal mines with no economic feasibility, has been implemented, the number of closed and closed mines in Korea is currently counting at 900, and a method for stably treating and restoring them. This situation is being examined in various ways.

In addition, most of the foam concrete has been used only for the insulation of apartments, etc., and only partially applied to the slope structure of civil engineering, etc. for filling. Only a few techniques for producing aerated concrete using bottom ash as aggregates have been reported, but its use is an attempt to be applied as sound absorbing material, insulation material and partition material for building construction. There is no example.

Therefore, the present invention was invented to solve the above conventional problems, the underground cavity of the abandoned mine using a filler such as foam concrete formed through the bottom ash generated as a by-product during the power generation process of the thermal power plant To prevent ground subsidence of abandoned mines by underground cavities and to process a large amount of bottom ash without burying them separately, so that underground cavities are embedded using bubble concrete containing bottom ash to prevent environmental destruction. The purpose is to provide a construction method.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view showing a construction method according to the present invention, showing a state of injecting a filler through the injection hole by drilling the injection hole and the confirmation hole.

As shown in the figure, the present invention, in order to inject the filler 20 into the underground cavity 11 and the tunnel 12 formed in the abandoned mine 10, the underground cavity of the lower portion from the top of the abandoned mine 10 The injection hole 13 is drilled to (11). At the time of drilling the injection hole 13 can be easily punched through a conventional drilling device (not shown).

Here, the filler 20 is a foam concrete prepared by mixing the bottom ash, which is a by-product generated from the thermal power plant with the mortar as a fine aggregate, and then adding a foaming agent such as a polymer foaming agent and aluminum powder. The concrete manufacturing method of the foam concrete utilizes the manufacturing method of the ordinary on-site casting foam concrete that is currently applied for the use of insulation and filling layer, such as apartment houses.

However, when constructed by the indentation method, since sufficient fluidity is required, the flow value of the evaluation item is manufactured to be in the range of 200 to 300 mm. In addition, the permeability coefficient of the foamed concrete for the drainage effect around the construction site is manufactured so that the average permeability coefficient of clay is 10-5 ~ 10-7cm / sec or more. The compressive strength should be sufficient to cope with the settlement of the ground, but it should be able to cope with future re-excavation.

On the other hand, one side of the injection hole 13 to offset the filling pressure during the filling, and punctures the confirmation hole 14 for confirming the injection state of the filler (20).

Here, the injection hole 13 and the confirmation hole 14 drills to a predetermined depth, that is, to a depth in communication with the underground cavity 11 previously formed in the abandoned mine 10.

In addition, when the filler 20 made of aerated concrete is injected into the underground cavity 11 of the abandoned mine 10, the drilled injection hole 13 and the confirmation hole 14 are gently inclined at 40 to 90 ° by the drilling device. And after boring vertically, it is injected and filled into the underground cavity 11 by the normal pump pressure method.

In addition, the bottom ash contains a large amount of salt because it is transported and loaded into the ash processing plant using sea water from a thermal power plant, but when used for filling the underground cavity 11 of the abandoned mine 10, there is a risk of salt damage. It is not used, so use it as it is.

In addition, when used as concrete aggregate, manpower and cost are added because it must go through the process of crushing, pulverization, classification and stabilization, but the bottom ash according to the present invention is discharged without the need for the above work in the thermal power plant It means the usual thing as it is.

After drilling the injection hole 13 and the confirmation hole 14 in the abandoned mine 10 as described above, by extending the pressure pipe (40) installed in the conventional pump pumping device 30 to the upper part of the abandoned mine 10 The filler 20 is injected into the underground cavity 11 through the injection hole 13.

When the filler 20 is injected into the injection hole 13, a flexible injection hose 41 is connected to the pressure pipe 40 to facilitate injection. Here, when the filler 20 is injected through the injection hole 13, the present invention is filled in the underground cavity 11. In the process of filling the underground cavity 11, the underground cavity 11 is filled. The pressure generated by the residual air formed therein is generated, and the filling operation of the filler 20 is smoothly performed by being discharged to the outside through the confirmation hole 14 to relieve such pressure.

In addition, after the filler 20 is filled in the underground cavity 11, it is filled up to the injection hole 13 and the confirmation hole 14 communicated with the underground cavity 11, and the injection hose 41 is filled in advance. Since the state is inserted into the injection hole 13, it is filled in the confirmation hole 14 first, it is easy to check the injection situation, see the state filled in the confirmation hole 14, gradually injected from the injection hole 13 Fill the injection hole 13 while removing the hose 41.

In addition, when the pressure pipe 40 is installed in the abandoned mine 10, the support 42 (43) is provided on the top of the abandoned mine 10 so that the pressure pipe 40 is extended to a predetermined height and then positioned , The injection hose 41 is connected.

In addition, when the filler 20 is injected, both the underground cavity 11, as well as the injection hole 13 and the confirmation hole 14 are filled, and as shown in FIG. 2, the filler 12 is filled in the tunnel 12. 20 is filled, the partition 15 is provided in the boundary part of the tunnel 12 and the underground cavity 11, and the underground cavity 11 and the tunnel 12 are interrupted | blocked. This is for injecting more effectively through the pressure feed pipe 40 used for the filling of the filler 20.

In the state where the partition wall 15 is installed, after the filler 20 is first filled in the underground cavity 11, the pump pipe device 30 is connected to the pump pipe 40 and the pump pipe 40 through the pump pump device 30. The injection hose 41 is inserted into the shaft 12 to fill the filler 20 to complete the work.

As described above, the present invention is filled with a filler in the underground cavity of the abandoned mine to prevent ground subsidence due to the cavity, and moreover, as a foam concrete containing the bottom ash, it is easy to fill by the grouting method, It has a strength similar to that of soil, so it can be designed to have low strength for future re-excavation. Since aerated concrete basically contains a large amount of pores, it can fill a large volume with a small amount of raw material, which is very economical. have.

In addition, the present invention, since the bottom ash as a filler component is a by-product generated after combustion of anthracite coal, etc., when it is filled in the underground cavity of the abandoned mine, it is eventually restored to the origin of origin. Cement is used as a binder to be combined with, which is also a material based on limestone or clay, so that returning to the abandoned mine has the effect of recycling resources.

In addition, the present invention eliminates the need for a separate landfill and sedimentation disposal site as in the prior art to process a large amount of bottom ash generated, thereby eliminating the difficulty to secure the site, thereby having an environment-friendly response.

Although the present invention has been described for the embodiments of the present invention based on the accompanying drawings for convenience, it is obvious that various modifications and changes are possible within the scope of the technical idea of the present invention.

Claims (4)

Drilling the filler injection hole 13 from the upper portion of the abandoned mine to the underground cavity 11; Drilling a confirmation hole (14) separately from the filler injection hole (13) from the upper part of the abandoned mine to the underground cavity (11) to offset the filling pressure during filling of the filler and to confirm the injection state of the filler; Foam concrete including a bottom ash characterized in that it comprises the step of filling the underground cavity portion 11 of the abandoned mine by injecting a filler made of foam concrete including the bottom ash through the filler injection hole (13) Underground cavity reclamation construction method. The method according to claim 1, In the step of filling the underground cavity 11, Installing a pressure feeding pipe 40 of the pump pressure feeding device along the upper portion of the abandoned mine; An injection hose 41 is connected to an end of the pressure feeding pipe 40; Inserting the injection hose 41 into the injection hole 13, the underground cavity buried construction using the foam concrete including the bottom ash, characterized in that the filler is easily injected through the injection hose 41 Way. The method according to claim 1 or 2, Prior to the filling of the underground cavity 11, The underground cavity buried construction method using the foam concrete including a bottom ash, characterized in that the partition wall 15 is provided between the tunnel 12 and the underground cavity 11 formed on one side of the abandoned mine. The method according to claim 3, After filling the underground cavity 11, The underground cavity buried construction method using the bubble concrete containing the bottom ash, characterized in that the filling of the tunnel by injecting a filler made of aerated concrete including the bottom ash to the tunnel of the abandoned mine.

Images