KR101337795B1 - Method and system for stabilizing soft mass - Google Patents

Abstract

The present invention relates to a method and a system for stabilizing properties of soft soil. The purpose of the present invention is to provides a method and a system for stabilizing properties of soft soil which are provided to enable the improvement of soil; to be applied to various soil; to obtain better economic efficiency and the efficiency in comparison with an existing method; to reduce energy; to cause no secondary pollution of ambient soil; to improve the utilization of soil; to be flexibly joined to other structures; to reduce air pollution generated by a transport member; to have no necessity of a damping site; to minimize negative influences to an ambient environment; and to enable spoil to be recycled.

Description

Soft soil property stabilization method and system {Method and System for stabilizing soft mass}

The present invention relates to a soft soil property stabilization method and system. More specifically, by installing a power mix in the excavator and mixing the soft soil and the binder while spraying the binder on the soft soil through the pressure feeder, it is possible to improve the soil in a short time and to apply to various soils, Compared to the economy, efficiency, energy saving, secondary pollution does not occur in the surrounding soil, soil utilization and flexibility are combined with other structures, and there is no need to move the ground, In addition to reducing costs, reducing pollution from transportation, and eliminating the need for conventional dumping processes, soil stabilization in environmental aspects can minimize the negative impacts on the environment. In contrast, vibration and noise are insignificant and soil coupling is secured so that leaching or It can be applied to solidification of dredged soil that has been recognized as impossible to recycle, and improved dredged soil which has been transported to the dump or stabilized by firmly combining pollutants. The present invention relates to a process and system for stabilizing soft soil properties that can be recycled.

In general, sediment builds up on the bottom of the soft offshore. These sediments are formed by mixing aggregates, such as sand and gravel, which have flowed down and upstream or downstream of the stream, and sediment sludge that contaminates water quality.

Sediment sludge among these sediments is an organic substance that consumes dissolved oxygen in raw water, and contains various harmful substances such as nitrogen and phosphorus and heavy metals that cause eutrophication. Therefore, sediment sludge deteriorates the water quality, causes algae and the like to grow abnormally by eutrophication, not only generating gas harmful to living organisms, but also accelerating pollution by losing the ocean's self-cleaning ability. In addition, sedimentation sludge is deposited on the floor with aggregate to lower the water depth by gradually reducing the depth, there is a problem to increase the bottom height of the bay used as a port in the coastal waters.

In order to collect such sewage sludge, a dredger such as a bucket conveyor is generally installed, and an attempt is made to secure a wide and deep channel by digging out soil or rocks deposited on a harbor or a river bottom.

After such dredging, the treatment of dredged soil is a problem. Dehydration and recycling of the water contained in dredged soil is a very difficult and difficult task.

In the case of pump dredging, it is common to dehydrate and then landfill dredged soil consisting of 10% of the water and 90% of water. As mentioned above, the dredged soil contains various harmful substances and heavy metals, which not only causes environmental pollution when landfilling, but also requires a lot of landfill costs.

Therefore, the dredged soil can be dehydrated in real time to improve its strength and be recycled as road construction flooring materials and port reclamation foundation materials, thereby stabilizing heavy metals. There is a need to develop a technology that can stabilize soft soils without replacement.

The present invention has been made to solve the above problems, and in particular, it is possible to improve the soil quality in a short time and can be applied to a variety of soil, economical efficiency, efficiency, energy saving, etc. compared to the existing construction methods, and the surrounding soil Does not cause secondary pollution, improves soil utilization, flexibly combines with other structures, reduces pollution from transportation, and eliminates the need for dumping sites required by conventional treatment methods. In addition to minimizing the negative effects on the surroundings, the aim is to provide a soft soil property stabilization method and system that can recycle dredged soil.

Soft soil property stabilization system according to the present invention devised to achieve the above object is an excavator located on the ground; It is provided on one side of the outer surface of the work hose supply pipe is provided with a power supply and transmission unit, the coupling portion is provided at one end of the workbench and detachably coupled to the excavator, the other end of the workbench A power mix including at least one mixing rotating body in which a plurality of mixing blades are disposed to be spaced apart from each other on a circumference to perform a mixing operation while rotating; Storage tank for storing the binder therein, one end is connected to the storage tank to transfer the binder, the other side is inserted into the supply hose insert pipe for injecting the binder in the direction of the mixing rotor body And a pressurized feeder including a compressed air supply unit for supplying compressed air to the supply hose, the pressure feeder being mounted on a crawler vehicle to maintain a proper distance from the excavator by remote control; A Data Aquisition Control system (DAC) for controlling, measuring and reporting the air pressure of the compressed air supply unit and the supply amount of the binder; And accommodate the soft soil, and part of the workbench and the mixing rotor are dipped in the soft soil to stabilize the soft soil while mixing the binder and the soft soil, the top being the same as the ground or the ground. It characterized in that it comprises a soft soil tank located lower.

In addition, the binder is any one or two of cement, lime, boiler slag, ash as a by-product of combustion, gypsum as a final by-product of the desulfurization process, and calcium sulphate. It is preferable that it is a mixture of the above.

Soft soil property stabilization method according to the present invention comprises the steps of (a) filling the soft soil of the soft soil tank having a content of 70 to 80% by weight; (b) coupling the power mix to the excavator; (c) mounting the supply hose of the pressure feeder to the supply hose insertion tube of the power mix; And (d) supplying compressed air through the compressed air supply unit while controlling and measuring the air pressure of the compressed air supply unit and the supply amount of the binder, injecting the binder into the soft soil tank with the supply hose, and supplying the power to the power mix. It characterized in that it comprises the step of mixing the soft soil and the binder.

According to the present invention, by mounting the power mix to the excavator and mixing the soft soil and the binder while spraying the binder to the soft soil through the pressure feeder, it is possible to improve the soil in a short time and can be applied to various soils, and to existing methods Compared to the economy, efficiency, energy saving, secondary pollution does not occur in the surrounding soil, soil utilization and flexibility are combined with other structures, and there is no need to move the ground, In addition to reducing costs, reducing pollution from transportation, and eliminating the need for conventional dumping processes, soil stabilization in environmental aspects can minimize the negative impacts on the environment. In contrast, vibration and noise are insignificant and soil coupling is secured so that leaching or There is an effect that does not occur.

In addition, the present invention can be applied to the solidification of dredged soil, which has been recognized as not possible to recycle until now, and improved the dredged soil which was transported to an dumping ground or stabilized by firmly combining pollutants, thereby improving the basic land for park or harbor container yard expansion. The effect can be recycled into.

1 and 2 is a block diagram of a soft soil property stabilization system according to a preferred embodiment of the present invention,
3 is a detailed view of the power mixer of FIGS. 1 and 2;
4 is a perspective view of the pressure feeder of FIGS. 1 and 2;
5 is a perspective view showing a monitor of the DAC,
6 is a conceptual diagram illustrating a process of stabilizing dredged soil using the soft soil property stabilization system according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be variously modified by those skilled in the art.

1 and 2 is a schematic view of a soft soil property stabilization system according to a preferred embodiment of the present invention, Figure 3 is a detailed view of the power mixer of Figures 1 and 2. 4 is a perspective view of the pressure feeder of FIGS. 1 and 2, and FIG. 5 is a perspective view illustrating a monitor of the DAC.

1 is an embodiment in which the natural soft soil tank is made by excavating the ground without providing a separate soft soil tank, Figure 2 is provided with a separate soft soil tank 60, which is applied to stabilize the dredged soil, etc. It is an embodiment that can be.

Soil stabilization according to the present invention is a method of increasing the ground strength by mixing the appropriate binder (aqueous or dry) to the soft ground. The binder may be selected from traditional materials such as lime, cement, fly ash, slag, by-products, or mixtures thereof, and the stabilization process may be performed in parallel with the general pile process.

Soil stabilization according to the present invention is carried out to strengthen the soft soil, to improve the non-synthetic fraction of soft soil, to increase the strength of soft soil, and to restore contaminated soil.

The advantages of soil stabilization according to the present invention can be summarized as follows.

First, the soil can be improved in a short time, and it can be applied to various soils.

Second, economic feasibility, efficiency, and energy saving are possible compared to existing methods.

Third, it does not cause secondary pollution to the surrounding soil, improves soil utilization and is flexibly combined with other structures.

Fourth, because there is no need to move the target ground, the time and cost associated with transportation is reduced, pollution generated from the transportation means is reduced, and the dumping site required for the conventional treatment method is unnecessary.

From the environmental point of view, the soil stabilization according to the present invention can minimize the negative effects on the surroundings. In comparison with the conventional method, the vibration and noise are insignificant and the soil coupling is sure, so that no leaching or transition to the surrounding soil occurs. Do not.

Soil stabilization method according to the present invention is particularly useful for reinforcing the ground of a large area at a low cost, it can be applied when the ground, such as roads, railroad grounds, stockyards, etc. soft to a depth of about 1 ~ 5m. If the load-bearing strata are located within 5 meters of the earth's surface, they will be able to receive the required loads by reinforcing the soil in the desired area without replacing soil or piling, as in the conventional construction.

In addition, the soil stabilization method according to the present invention can be applied to the solidification of dredged soil, which has been recognized to be impossible to recycle until now. Dredged soil is usually transported to a dump and landfilled, which often reaches its limit, or is contaminated, making dumping impossible in the usual way. The soil stabilization method according to the present invention improves the soil or stabilizes by tightly combining the contaminants to be used as the basic soil for the expansion of the park site or harbor container yard.

Soil stabilization method according to the present invention can enhance the soil according to the mixing type of the binder mixed in the excavated soil, it can also be used as a road aggregate basic aggregate.

Soil stabilization method according to the present invention is unstable in road and railway construction, storage, parking lot, stadium, industrial ground, bridge, swimming pool, landfill, noise barrier, river slope, transportation vibration reduction, dredged soil solidification and stabilization, tunnel construction Applicable to a wide variety of areas including ground reinforcement, cable, pipe channel sites, close structure protection, ground pressure reduction, groundwater protection layer formation, frozen ground, frost protection, contaminated soil treatment (solidification, stabilization, sequestration, recycling) It is possible.

Soft soil property stabilization system according to a preferred embodiment of the present invention, referring to Figures 1 to 3, excavator 10, power mix 20, pressure feeder (Pressure Feeder) 40, DAC (Data Aquisition Control) system) (not shown), and the soft soil tank 60.

Excavator 10 is located on the ground, a general excavator can be applied. The power mix 20 is mounted instead of the fork portion of the excavator 10.

The power mix 20 is detachably coupled to the excavator 10. Referring to FIG. 3, the power mix 20 includes a work bench 22, a supply hose insertion tube 24, a coupling part 26, and a mixing rotor 28.

The work table 22 forms the outer shape of the power mix 20, and the inside of the work table 22 is formed in an empty pipe shape. For example, the work bench 22 may be formed in a square pipe shape as shown in FIG. 3, but the work table 22 is not limited thereto. The interior of the work table 22 is provided with a power supply and transmission unit (not shown) to provide rotational power to the mixing rotor (28).

The supply hose insertion pipe 24 is provided on one side of the outer surface of the work bench 22, and the supply hose 46 connected to the supply hose connector 44 of the pressure feeder 40 is connected to the work bench 22. Fix it.

Coupling portion 26 is provided at one end of the work table 22, is coupled to the excavator 10 to be detachable. In a typical excavator, the coupling part 26 is coupled instead of the fork.

The mixing rotor 28 is provided at the other end of the work table 22. The mixing rotor 28 is arranged so that the plurality of mixing blades 29 are spaced apart from each other on the circumference to perform the mixing operation while rotating. At least one mixing rotor 28 may be provided as shown in FIG. 3, but the number of the mixing rotors 28 is not limited thereto. The mixing rotor 28 serves to mix the soft soil and the binder by the rotation of the mixing blade 29.

The pressure feeder 40 is mounted on the crawler vehicle to maintain a proper distance with the excavator 10 by remote control. The pressure feeder 40 supplies and transports the binder to the supply hose 46. The pressure feeder 40 includes a storage tank 42, a supply hose connector 44, a supply hose 46, and a compressed air supply unit (not shown).

Storage tank 42 stores the binder therein.

The supply hose connector 44 transfers the binder stored in the storage tank 42 to the supply hose 44. To this end, the supply hose 44 is connected to the supply hose 44.

One end of the supply hose 46 is connected to the storage tank 42, more specifically, the supply hose connector 44 to transfer the binder, while the other side is inserted into the supply hose insertion tube 24. The binder is sprayed in the direction of the mixing rotor 28.

The compressed air supply unit (not shown) supplies compressed air to the supply hose 46, so that the binder can be injected at an appropriate pressure through the supply hose 46.

The DAC (not shown) controls, measures and reports the air pressure of the compressed air supply and the supply amount of the binder. For example, the DAC may report a measurement of air pressure and supply amount of a binder through the monitor 70 as shown in FIG. 5. The DAC manages the entire soft soil property stabilization system to keep it user-friendly and transfer data to other computers and remote locations.

Referring to FIG. 2, the soft soil tank 60 provides a space for accommodating the soft soil and mixing with the binder to stabilize the soft soil. A portion of the work table 22 and the mixing rotor 28 are dipped in the soft soil to stabilize the soft soil while mixing the binder and the soft soil. At this time, the soft soil tank 60 is open at the upper end, it is preferable that the upper end is located at the same or lower than the ground in terms of the positional relationship with the excavator.

In particular, the soft soil tank 60 is suitable for stabilization of dredged soil. The soft soil tank 60 accommodates dredged soil underwater, including a river bottom and a soft offshore bottom, and a portion of the work platform 22 and the mixing rotor 28 are dipping into the dredged soil to mix the binder and the dredged soil. To stabilize.

The binder contained in the storage tank 42 of the pressure feeder 40 and sprayed through the supply hose 46 may include cement, lime lime, boiler slag, and by-products generated during combustion. Ash, gypsum, calcium sulphate, the final by-product of the desulfurization process, or calcium sulphate, or a mixture of two or more may be used.

Binders are classified as water soluble and dry, where water soluble solidifies on contact with moisture, and dryness requires a catalyst to initiate solidification. Water soluble binders can stabilize most soils, but precise mechanical mixing is indispensable, and lower mixing qualities lower the stabilization efficiency. Dry binders improve the soil's geotechnical properties by reacting with clay minerals in the soil.

The finer the powder, the higher the efficiency, and a mixture of slag, ash, and gypsum may be used. Cement does not penetrate the surrounding soil, unlike lime, so precise mixing is required.

As lime, quick lime (CaO) or hydrated lime (Ca (OH) ₂ ) may be used. Lime stabilization is based on the reaction with minerals in the soil. Quicklime reacts with water in the soil to become water-soluble lime, in addition to exothermic heat, speeding up the reaction and reducing moisture. Ion exchange occurs during the reaction, which changes the soil structure, and the solidification reaction can continue for many years after the operation.

The boiler furnace slag must be powdered to react, and the finer the reaction efficiency is. Lime or cement can also facilitate the reaction. The slag solidifies for many years after the operation and is stronger in the long term compared with the use of cement single binder.

Ash is a by-product of fine particles produced in the combustion process, and there are various types depending on the fuel used and the combustion process. Fly ash can be collected from flue gases filters.

FGD is the final by-product of flue gas desulfurization, such as pure gypsum and calcium sulfate. In addition, sand can be mixed and the sand must be efficient, clean and frost-resestant for soil unification.

6 is a conceptual diagram illustrating a process of stabilizing dredged soil using the soft soil property stabilization system according to the present invention.

Referring to 1 of FIG. 6, first, dredging is performed in water including a river bottom and a soft water bottom using a dredging means. Grab and the like may be used as the dredging means, it is not limited to the dredging means.

Referring to 2 of FIG. 6, the dredged soil accommodated in a barge and the like is loaded and transported in a vehicle.

Referring to 3 of FIG. 6, the dredged soil transferred to the dredged soil stabilization site through a vehicle is moved to a dredged soil tank.

Referring to 4 of Figure 6, by using a soft soil property stabilization system according to the present invention to stabilize the dredged soil by mixing while spraying the binder to the dredged soil contained in the dredged soil tank.

Dredged soil contains various harmful substances and heavy metals, which not only causes environmental pollution during landfill, but also requires a large amount of landfill costs. The soft soil property stabilization system according to the present invention can stabilize heavy metals while improving the strength while real-time dehydration of such dredged soils, recycling them as road construction flooring materials, base materials for reclamation of ports, and reinforcing when the ground is soft in road construction or facility construction. For this purpose, the soft soil can be stabilized without having to pile or change soil.

The soft soil property stabilization method using the soft soil property stabilization system according to the present invention is as follows.

First, the soft soil tank 60 is filled with soft soil having a content of 70 to 80% by weight. If the soft soil is dredged soil, the dredged soil dredged by the dredging means is transferred to the stabilization work site to fill the dredged soil in the soft soil tank (60).

Next, the power mix 20 is coupled to the excavator 10, and the hose 46 for supply of the pressure feeder 40 is attached to the hose insertion pipe 24 for supply of the power mix 20.

Next, while controlling and measuring the air pressure of the compressed air supply unit and the supply amount of the binder using the DAC, the compressed air is supplied through the compressed air supply unit, and the binder is injected into the soft soil tank 60 using the supply hose 46, and the power is supplied. The soft soil and the binder are mixed into the mix 20.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

10-Excavator 20-Power Mix
40-Pressure Feeder 60-Soft Soil Tank

Claims (3)

delete delete An excavator located on the ground; It is provided on one side of the outer surface of the work hose supply pipe is provided with a power supply and transmission unit, the coupling portion is provided at one end of the workbench and detachably coupled to the excavator, the other end of the workbench A power mix including at least one mixing rotating body in which a plurality of mixing blades are disposed to be spaced apart from each other on a circumference to perform a mixing operation while rotating; Storage tank for storing the binder therein, one end is connected to the storage tank to transfer the binder, the other side is inserted into the supply hose insert pipe for injecting the binder in the direction of the mixing rotor body And a pressurized feeder including a compressed air supply unit for supplying compressed air to the supply hose, the pressure feeder being mounted on a crawler vehicle to maintain a proper distance from the excavator by remote control; A Data Aquisition Control system (DAC) for controlling, measuring and reporting the air pressure of the compressed air supply unit and the supply amount of the binder; And accommodate the soft soil, and part of the workbench and the mixing rotor are dipped in the soft soil to stabilize the soft soil while mixing the binder and the soft soil, the top being the same as the ground or the ground. Soft earth tanks located lower, the binder being cement, lime, boiler furnace slag, ash as a byproduct of the combustion process, gypsum, calcium sulfate as the final by-product of the desulfurization process As a soft soil property stabilization method using a soft soil property stabilization system of any one or a mixture of (Calcium sulphate),
(a) filling the soft soil tank with soft soil having a content of 70 to 80 wt%;
(b) coupling the power mix to the excavator;
(c) mounting the supply hose of the pressure feeder to the supply hose insertion tube of the power mix; And
(d) supplying compressed air through the compressed air supply unit while controlling and measuring the air pressure of the compressed air supply unit and the supply amount of the binder, injecting the binder into the soft soil tank with the supply hose, and the power mix Mixing the soft soil with the binder
, ≪ / RTI &
If the soft soil is dredged underwater including the bottom of the river and the soft offshore, dredging means is carried out in the water including the bottom of the river and the bottom of the offshore, and the dredged soil accommodated in the barge is transported by transportation. A soft soil property stabilization method characterized in that the dredged soil is transferred to the soft soil tank and then mixed while spraying a binder to the dredged soil contained in the soft soil tank using the soft soil fast stabilization system to stabilize the dredged soil.

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