KR20110052106A - Vertical drain pile containing reactive column for soft ground improvement and soft ground improvement method using the same - Google Patents

Abstract

PURPOSE: A pile for a reactive column type vertical drain method and an improvement method of soft ground using the same are provided to simultaneously drain pore water within soft ground and purify contaminations in the pore water. CONSTITUTION: A pile(100) for a reactive column type vertical drain method comprises a first cover unit(110), a first contamination reaction unit(120), a second cover unit(130), a second contamination unit(140), a first drain mat(150), and a second drain mat(160). The first cover unit is composed of an impermeable material and is formed in a hollow shape. The inner side of the first cover unit is filled with the first contamination reaction unit. The second cover unit is separated from the first cover unit and is composed of a permeable material. A gap between the first and second cover units is filled with the second contamination reaction unit The first drain mat covers the bottom end of the first cover unit. The second drain mat covers the top end of the second cover unit.

Description

Vertical drain pile containing reactive column for soft ground improvement and soft ground improvement method using the same}

The present invention relates to a reactive column-type vertical drainage method pile and a method for improving the soft ground using the same. More specifically, it promotes drainage and contaminates by simultaneously purifying contaminants in the gap water while draining the gap water in the soft ground. The present invention relates to a file for a reactive column type vertical drainage method capable of performing purification and a method for improving soft ground using the same.

In general, the areas formed by reclamation, dredging, or reclamation of coasts, rivers, lakes, and harbors not only form wetlands mixed with water and cohesive soils or water, but also contain pore water in the ground. Therefore, since the overall strength of the ground becomes very weak, so as to form a soft ground, in order to utilize such an area as an industrial area or a commercial area, the work of improving the soft ground to be suitable for site utilization must be preceded.

As a method for improving the soft ground as described above, the sand ground or the drain paper board is inserted into the ground by the casing, like the sand drain method or the paper drain method, and the consolidation of the soft ground is promoted by discharging the ground pore water to the ground surface. Vertical drainage method, sand compaction pile in the ground, sand compaction pile method to reinforce the bearing capacity along with the discharge of underground gap water, forced replacement method by santo landfill, or lime Various methods such as the rim column method using pillars have been adopted in various ways depending on the site conditions.

Among these, the sand drain method is a typical method of the vertical drainage method, and refers to a method of promoting sand drainage by artificially pouring sand piles vertically in the soft ground using sand as draining material.

1 is a schematic diagram of a conventional sand drain method.

Referring to FIG. 1, a conventional sand drain method first drills a drain hole H in a compressible clay ground at a predetermined interval using a mandrel (not shown), and then sands S in the drilled drain hole H. ), The compressible clay ground is consolidated to promote drainage.

However, the conventional sand drain method cannot be used when the gap water (W) in the soft ground is contaminated with heavy metals, so that it can be used only after the completion of a separate ground purification work to purify the contaminated gap water (W). There is a problem.

In view of these problems, a method for improving the soft ground and purifying the contaminated gap water (W) has been proposed, but the method for improving and purifying the soft ground according to the prior art responds to the contaminated gap water (W). There is a problem that the purification efficiency is lowered as the reaction medium and the contaminated pore water (W) do not secure sufficient spatial length and time allowance required for mutual reaction. That is, as illustrated in FIG. 1, the method for improving and purifying the soft ground according to the related art is a reactive material from the soft ground even when the drain hole H is filled with a reactive material capable of purifying contaminants other than sand. Since the pore water (W) flowing into the side is directly introduced in the direction parallel to the ground over the upper and lower sides of the soft ground, contaminants in the pore water (W) flowing from the upper side of the soft ground can sufficiently react with the reactive material. There is a problem that can not secure time and space.

In addition, the method of improving and purifying the soft ground according to the prior art is not made by a modular structure, which is not only time-consuming to install, but also cumbersome when the installation work is cumbersome and the purification capacity of the reaction medium reaches a limit, which is no longer contaminated. There is a problem that can not be purified.

An object of the present invention is to improve the pile and the soft ground using the same method for the reactive column type vertical drainage method which can perform drainage promotion and pollution purification by simultaneously purifying contaminants in the pore water while draining the pore water in the soft ground. To provide a way.

According to the present invention, the first cover portion is made of an impermeable material that is inserted into the sand drain is inserted along the drain hole penetrated through the soft ground and does not pass through the gap water of the soft ground. ; And a first contaminant reaction part filled in the hollow part inside the first cover part and having a reactivity to contaminants so that contaminants in the pore water flowing from the lower side of the soft ground and moving upwards can be purified. It is achieved by a pile for the reactive column type vertical drainage method characterized in that.

The first cover part and the first contaminant reaction part may be inserted into the sand drain spaced apart from the lower end of the sand drain by a predetermined distance.

The reactive column type vertical drainage method file includes: a first drain mat provided to cover a lower end of the first pollutant reaction part so that the gap water flows from the lower side of the soft ground to the first pollutant reaction part; And a second drainage mat provided to cover an upper end of the first pollutant reaction part so that the gap water moved upward along the first pollutant reaction part may flow out.

The first contaminant reaction part may be formed of a steel slag or zeolite material satisfying a permeability coefficient of 10 ⁻³ to 10 ⁻¹ cm / sec.

The first cover part may be provided as a high density polyethelene (HDPE) pipe or a PVC pipe.

The first drain mat and the second drain mat may be provided with geotextiles having water permeability.

According to the present invention, the first cover portion is formed of an impermeable material that is introduced through the drain hole penetrated through the soft ground and does not pass through the gap number of the soft ground; A first contaminant reaction part filled in the hollow portion inside the first cover part and having a reactivity to the contaminant so that the contaminant in the pore water flowing from the lower side of the soft ground and moving upward is purified; A second cover part spaced apart from the first cover part to be adjacent to an inner circumferential surface of the drain hole and formed of a water-permeable material; And a second contaminant reaction part filled between the first cover part and the second cover part and having a reactivity to contaminants so that the contaminants in the gap water can be purified. It is also achieved by a pile for construction.

The lower end of the first cover part and the first contaminant reaction part may be spaced apart from the lower end of the second cover part and the second contaminant reaction part by a predetermined interval upward.

The second contaminant reaction part may include at least one of steelmaking slag, zeolite, and sand satisfying a permeability coefficient of 10 ⁻³ to 10 ⁻¹ cm / sec.

The object is, according to the invention, (a) forming a drain hole in the soft ground using a mandrel; (b) filling a predetermined region of the lower end of the drain hole with a reactive material having reactivity to the pollutant so that the pollutant in the gap water of the soft ground can be purified; (c) introducing a pile for the reactive column type vertical drainage process along the drain hole to be disposed above the reactive material; And (d) filling the reactive material into a space between an inner circumferential surface of the drain hole and an outer circumferential surface of the reactive column type vertical drainage method pile, wherein the reactive column type vertical drain method pile includes: the drain hole A hollow first cover part penetrated along and provided with an impermeable material that does not pass through the gap water of the soft ground; And a first contaminant reaction part filled in the hollow part inside the first cover part and having a reactivity to contaminants so that contaminants in the pore water flowing from the lower side of the soft ground and moving upwards can be purified. It is also achieved by a method for improving the soft ground using a pile for the reactive column type vertical drainage method.

The method of improving the soft ground using the pile for the reactive column type vertical drainage method, after the step (d), except for (e) a portion of the ground of the soft ground except for the portion in which the pile for the reactive column type vertical drainage method is disposed. The method may further include installing an order impermeable member on the ground of the part.

In the method of improving the soft ground using the reactive column type vertical drainage method pile, after the step (e), the gap number is moved from the lower side to the upper side of the soft ground in a direction substantially parallel to the ground of the soft ground. The method may further include installing a drainage mat to cover the top surface of the order member and the top surface of the pile for the reactive column type vertical drainage method so as to be moved along.

The order member may be an impervious geotextile.

According to the present invention, a hollow first cover part made of an impermeable material which does not pass through the gap water of the soft ground, and a first contaminant filled in the hollow part inside the first cover part and having reactivity with contaminants. It is possible to provide a file for the reactive column type vertical drainage method that can simultaneously promote the drainage and purify the pollutants by simultaneously purifying the contaminants in the pore water while draining the pore water in the soft ground including the reaction part.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, descriptions of already known functions or configurations will be omitted to clarify the gist of the present invention.

FIG. 2 is a perspective view of a file for the reactive column type vertical drainage method according to an embodiment of the present invention, and FIG. 3 is a front view of the file for the reactive column type vertical drainage method shown in FIG. 2.

2 and 3, according to an embodiment of the present invention, the column type vertical drainage method pile 100 (hereinafter, referred to as the vertical drainage process pile 100) is provided with an impervious material. The hollow first cover part 110, the first pollutant reaction part 120 filled inside the first cover part 110, and the first cover part 110 are spaced apart from the first cover part 110 and provided with a water-permeable material. The second cover part 130, the second pollutant reaction part 140 filled between the first cover part 110 and the second cover part 130, and a lower end portion of the first cover part 110. A covering first drain mat 150 and a second drain mat 160 covering the upper end of the first cover portion 110.

The first cover part 110 provides a space in which the first pollutant reaction part 120 can be filled, and the gap water (W, see FIG. 8) flowing from the soft ground (SG, see FIG. 8) is firstly provided. It is a member provided with an impervious material to be moved to the lower side of the pollutant reaction unit 120.

The first cover part 110 is provided as a high-density polyethylene (HDPE) HDPE pipe or PVC (Polyvinyl Chloride) PVC pipe, where the HDPE is a synthetic resin used for extrusion molded products such as wires, hoses, pipes, ropes PVC is a homopolymer of vinyl chloride or a copolymer containing 50% or more of vinyl chloride, and PVC refers to a material used for the production of water pipes by sheet, film or extrusion molding for packaging and agriculture. However, the material of the first cover part 110 is not limited to the above-described example.

As shown in FIG. 2, the first cover part 110 having a circumferential shape has a hollow portion formed therein, and the first pollutant reaction part 120 is filled along the hollow portion.

On the other hand, the first pollutant reaction unit 120 is introduced from the second cover 130, the gap water (W) moved to the lower side of the soft ground (SG) by the first cover 110 is moved upwards While the contaminants contained in the gap water (W) is configured to be purified.

The first pollutant reaction unit 120 is made of a steel slag or zeolite material having reactivity to the pollutant in order to purify the pollutant in the pore water (W). Steelmaking slag refers to the residue left after removing metal from the ore, and zeolite refers to crystalline aluminum silicate mineral.

The first pollutant reaction unit 120 is provided with steelmaking slag or zeolite that satisfies the particle size range of 0.074 to 4.75 mm and the permeability coefficient range of 10 ^-3 to 10 ^-1 cm / sec, thereby reacting to contaminants in the pore water (W). To improve.

That is, the gap water (W) flowing from the lower side of the first contaminant reaction unit 120 moves to the upper side of the first contaminant reaction unit 120 and constitutes the steel slag or the first contaminant reaction unit 120. It will react with the zeolite and the contaminants will be purified accordingly.

However, the material of the first contaminant reaction unit 120 is not limited to the steelmaking slag or zeolite described above, and may be provided by using an oyster shell having a similar particle diameter and permeability coefficient as necessary.

The pile 100 for the vertical drainage method of the present embodiment including the first cover part 110 and the first pollutant reaction part 120 guides the flow of the gap water W to the lower side of the soft ground SG. Then, by allowing the first contaminant reaction unit 120 to be moved from the lower side to the upper side, it is possible to secure a sufficient reaction distance and reaction time to remove the contaminants in the pore water (W), thereby further purifying the outside. Even if no facility is installed, it is possible to simultaneously improve the soft ground (SG) and purify pollutants.

Meanwhile, the second cover part 130 is a member provided to contact the inner circumferential surface of the drain hole DH (see FIG. 6) at a predetermined interval from the first cover part 110. Unlike the first cover part 110, the second cover part 130 is made of a water-permeable material so that the gap number W flowing from the soft ground SG can be moved to the inside of the second cover part 130. do.

In the present embodiment, the second cover part 130 is a geotechnical porous porous product formed by weaving synthetic fibers such as polypropylene, polyester, polyethylene, polyacrylonitrile, or nylon. It is available in style (Geotextile) material. However, the material of the second cover part 130 is not limited to the above-described example.

The second pollutant reaction part 140 is primarily filled in the space between the first cover part 110 and the second cover part 130 to purify the pollutants in the gap water (W) flowing from the soft ground (SG). That's the part. The second pollutant reaction unit 140 is provided to include at least one of steelmaking slag, zeolite, oyster shell and sand satisfying the particle size range of 0.074 to 4.75 mm and the permeability coefficient range of 10 ^-3 to 10 ^-1 cm / sec. (W) to improve the responsiveness to contaminants.

The second pollutant reaction unit 140 may be provided with any one of steelmaking slag, zeolite, or oyster shell in the same manner as the first pollutant reaction unit 120, and may mix steelmaking slag and sand or mix zeolite and sand as needed. It can be prepared by mixing. That is, the second pollutant reaction unit 140 may be provided to include various components.

However, when any one of the steelmaking slag, zeolite, or oyster shell forming the second pollutant reaction unit 140 is mixed with sand, the pore water W rapidly purifies the contaminants in the pore water W. Via the pollutant reaction unit 140 has the advantage to be able to move to the lower side of the soft ground (SG).

Meanwhile, the first drain mat 150 and the second drain mat 160 are members of a water-permeable material provided to cover the lower side and the upper side of the first cover part 110, respectively. The pore water W in the soft ground SG introduced through the second cover part 130 is first purified through the second pollutant reaction part 140 and is made of an impermeable material. After moving to the lower side of the soft ground (SG) by the unit 110 is moved to the first pollutant reaction unit 120 through the first drain mat 150.

In addition, the first pollutant reaction unit 120 to ensure a sufficient spatial distance and time to move the pore water (W) to secondary purification of the contaminants in the pore water (W), purified pore water (W) Is leaked to the outside via the second drain mat (160).

The first drain mat 150 and the second drain mat 160 are the same as the above-described second cover part 130, respectively, polypropylene, polyester, polyethylene, and polyacrylonitrile. (Polycrynitril) or a porous permeable product formed by weaving synthetic fibers such as nylon (Geotextile) material is provided.

However, the scope of the present invention is not limited by the materials of the first drain mat 150 and the second drain mat 160.

The pile 100 for the vertical drainage method of the present embodiment includes a first cover part 110, a first pollutant reaction part 120, a second cover part 130, and a second pollutant reaction part 140. It is prepared to be ready to be inserted immediately after drilling the drain hole (DH) in the soft ground (SG).

That is, after the plurality of drain holes DH (see FIG. 5) are drilled in the soft ground SG using the mandrel M (see FIG. 5), the pre-prepared vertical drainage method piles 100 are respectively drain holes (DH). ), Cover the impermeable degree member (WP, see FIG. 7), lay a drainage mat (SM, see FIG. 7), build a fill layer (not shown), or apply a vacuum pumping device (not shown). By improving the soft ground (SG) by the installation will be to purify the pollutants at the same time.

However, it is also possible to provide only the first cover 110 and the first pollutant reaction unit 120 of the pile 100 for the vertical drainage method of the present embodiment in advance, the details of which will be described later in one embodiment of the present invention It will be described in detail in the improvement method of the soft ground according to the example.

The pile 100 for the vertical drainage method of the present embodiment is a hollow first cover portion 110 and the first cover portion 110 is made of an impermeable material that can not pass the gap water (W) of the soft ground (SG). Including a first pollutant reaction unit 120 filled in the hollow inside and having a reactivity to pollutants, while simultaneously draining the pore water W in the soft ground SG, the pollutant in the pore water W may be purged at the same time. By doing so, it has the advantage of performing drainage promotion and pollution purification together.

Figure 4 is a flow chart of a method for improving the soft ground using a pile for vertical drainage method according to an embodiment of the present invention, Figure 5 is a schematic diagram of the step of forming a drain hole in the soft ground of Figure 3, Figure 6 5 is a schematic view showing a state in which a vertical drainage method pile is inserted into a drain hole of FIG. 5 and then a reactive material is filled, and FIG. 7 is a view showing an order member and a drain mat after filling the reactive material of FIG. 8 is a schematic diagram showing the principle that the soft ground is improved and pollutants are purged at the same time according to the method of improving the soft ground of FIG. 4.

Referring to these drawings, the method of improving the soft ground (hereinafter referred to as the "improving method of the soft ground") using the pile for vertical drainage method according to this embodiment step of forming a drain hole in the soft ground (S11), Filling a reactive material into a predetermined region of the lower end of the drain hole (S12), injecting a pile for vertical drainage process along the drain hole (S13), and in a space between an inner circumferential surface of the drain hole and an outer circumferential surface of the pile for vertical drainage process Filling the reactive material (S14), and the step of installing a water-repellent member of the impermeable material on the ground of the other parts of the ground except for the portion where the pile for the vertical drainage method is disposed (S15), and vertical drainage And installing a drainage mat to cover the upper surface of the pile for the process (S16).

Forming a drain hole in the soft ground (S11) is a step of drilling a plurality of drain holes (DH) in the soft ground (SG) using a mandrel (M). In the step S11, a plurality of drain holes DH are drilled through the mandrel M in consideration of various factors such as the state and area of the soft ground SG.

The filling of the reactive material into a predetermined region of the lower end of the drain hole (S12) is a step of filling the reactive material C1 along the plurality of drain holes DH which are drilled through the previous step S11. In the step S12, the reactive material C1 is filled in a predetermined region of the lower end portion of the drain hole DH in order to infiltrate the pile 100 for the vertical drainage method, wherein the reactive material C1 is formed in the above-described embodiment. 2 is the same as the material constituting the contaminant reaction unit 140.

Injecting the vertical drainage pile along the drain hole (S13) is to arrange the vertical drainage pile 100 above the reactive material C1 filled in the drain hole DH. In the step S13, the vertical drainage method pile 100 is disposed on the upper side of the reactive material C1 that is already filled in a predetermined region of the lower end of the drain hole DH, where the vertical drainage process pile 100 is placed. In the above-described embodiment means a pile composed of the first cover 110 and the first pollutant reaction unit 120.

Filling the reactive material in the space between the inner circumferential surface of the drain hole and the outer peripheral surface of the vertical drainage pile (S14) after the arrangement of the vertical drainage pile 100 is completed, the reactive material (C2) along the outer peripheral surface drain hole (DH) is the filling step. In this step (S14) by filling the entire drain hole (D2) with the same reactive material (C2) as the reactive material (C1) filled in the previous step (S12), the pile 100 for the vertical drainage method is a reactive material (C1) , Surrounded by C2).

In the step S15 of installing the impermeable material on the ground of the ground of the soft ground except for the portion where the vertical drainage method pile is disposed (S15), the reactive material is filled in the entire drain hole (DH) and then vertically filled. It is a step of installing the order member WP on the ground other than the portion where the drainage method pile 100 is disposed. In the step (S15), the gap water (W) flowing from the soft ground (SG) is drainage mat (SM) by installing the order member (WP) on the ground of the remaining portion except the upper end of the vertical drainage pile (100) It is blocked so that it can not flow directly to the side, and the flow of the gap water (W) is guided to the lower side of the soft ground (SG).

The order member WP is installed in a manner adjacent to the first cover portion 110 of the pile 100 for vertical drainage method, but not coupled to each other. The reason why the order member WP and the first cover part 110 are not coupled to each other is that the order member WP is gradually lowered when the upper end of the soft ground SG is gradually consolidated downward according to the weight of the fill layer. To be able to move.

Installing the drainage mat to cover the upper surface of the vertical drainage pile (S16) is a step of installing the drain mat (SM) over the entire surface of the order member WP and the vertical drainage pile (100). In the step S16, the vertical drainage method pile 100 is installed from the lower side of the soft ground SG by installing the drainage mat SM over the entire upper surface of the order member WP and the vertical drainage process pile 100. The gap water W, which is moved upwardly, may be moved along a direction substantially parallel to the ground of the soft ground SG.

After this step (S16) to cover the fill layer (not shown) on the upper side of the drain mat (SM) so that the soft ground (SG) can be consolidated. However, if necessary, the fill layer may be omitted and in this case, it is possible to suck the gap water (W) flowing out to the upper portion of the pile 100 for the vertical drainage method through a vacuum pump (not shown).

According to the method of improving the soft ground of the present embodiment, the principle of simultaneously purifying and improving the pollution of the soft ground is as follows.

Referring to FIG. 8, the pore water W in the soft ground SG consolidated by the fill layer moves to the reactive material C2 filled in the drain hole DH, and the contaminants are primarily purified. Next, due to the order member WP covering the upper portion of the reactive material C2, the gap water W does not flow out to the drainage mat SM and continues to move toward the first cover part 110. As described above, since the first cover part 110 is made of an impermeable material, the gap water W cannot pass through the first cover part 110 to the first contaminant reaction part 120 and eventually becomes soft ground. It moves to the lower side of SG.

Pore water (W) moved to the lower side of the soft ground (SG) is moved to the first contaminant reaction unit 120 side through the first drain mat 150 and from the lower side of the first contaminant reaction unit 120 to the upper side Purification of the contaminants in the pore water (W) during the movement to the secondary is made secondary. Unlike the related art, while the pore water W is moved throughout the first pollutant reaction unit 120, the reactive material constituting the first pollutant reaction unit 120 and the contaminants in the pore water W are sufficiently reacted. Therefore, the purification efficiency of the contaminants will increase dramatically.

The sufficiently purified gap water W passing through the first pollutant reaction part 120 flows out to the outside through the second drain mat 160, and covers the order member WP and the vertical drainage pile 100. According to the drainage mat SM, the gap water W flows in a direction parallel to the ground of the soft ground SG.

In this embodiment, the improvement method of the soft ground can achieve both the improvement of the soft ground (SG) and the purification of the contaminants at the same time. Has the advantage of purifying the material.

While specific embodiments of the invention have been described and illustrated above, it is to be understood that the invention is not limited to the described embodiments, and that various modifications and changes can be made without departing from the spirit and scope of the invention. It is self-evident to those who have. Therefore, such modifications or variations are not to be understood individually from the technical spirit or point of view of the present invention, the modified embodiments will belong to the claims of the present invention.

1 is a schematic diagram of a conventional sand drain method.

2 is a perspective view of a pile for a reactive column type vertical drainage method according to an embodiment of the present invention.

3 is a front view of the pile for the reactive column type vertical drainage method of FIG.

Figure 4 is a flow chart of a method for improving the soft ground using a pile for vertical drainage method according to an embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating a step of forming a drain hole in the soft ground of FIG. 3.

6 is a schematic diagram showing a state in which a reactive material is filled after injecting a pile for vertical drainage into the drain hole of FIG. 5.

FIG. 7 is a schematic view illustrating a state in which the order member and the drain mat are disposed after the reactive material of FIG. 6 is filled.

8 is a schematic diagram showing the principle that the soft ground is improved and the pollutants are purged at the same time according to the method of improving the soft ground of FIG. 4.

* Description of the symbols for the main parts of the drawings *

100: file for the vertical drainage method 110: the first cover portion

120: first pollutant reaction part 130: second cover part

140: second pollutant reaction unit 150: the first drain mat

160: second drain mat

Claims (13)

A hollow first cover part inserted into a sand drain inserted along a drain hole penetrated through the soft ground and formed of an impermeable material that does not pass through the gap water of the soft ground; And And a first contaminant reaction part filled in the hollow part inside the first cover part and having a reactivity to the contaminant so that the contaminant in the pore water flowing from the lower side of the soft ground and moving upward is purified. A file for the reactive column type vertical drainage method characterized by the above-mentioned. The method of claim 1, The first cover part and the first pollutant reaction part, Reactive column-type vertical drainage method pile, characterized in that penetrated into the sand drain spaced apart from the lower end of the sand drain. The method of claim 1, A first drain mat provided to cover the lower end of the first pollutant reaction part so that the gap water flows from the lower side of the soft ground to the first pollutant reaction part; And Reactive column type vertical, characterized in that it further comprises a second drain mat is provided to cover the upper end of the first contaminant reaction portion so that the gap water moved upward along the first contaminant reaction portion to the outside Drainage file. The method of claim 1, The first pollutant reaction unit, Reactive column type vertical drainage method file, characterized in that provided with a steelmaking slag or zeolite material having a permeability coefficient of 10 ^-3 ~ 10 ^-1 cm / sec. The method of claim 1, The first cover part, File for reactive column type vertical drainage method, characterized in that the HDPE (High Densitity Polyethelene) pipe or PVC pipe. The method of claim 3, The first drain mat and the second drain mat, respectively Reactive column type vertical drainage method, characterized in that the pile is provided by a geotextile having a water permeability. A hollow first cover part inserted through a drain hole penetrated through the soft ground and provided with an impermeable material which does not pass through the gap number of the soft ground; A first contaminant reaction part filled in the hollow portion inside the first cover part and having a reactivity to the contaminant so that the contaminant in the pore water flowing from the lower side of the soft ground and moving upward is purified; A second cover part spaced apart from the first cover part to be adjacent to an inner circumferential surface of the drain hole and formed of a water-permeable material; And Reactive column type vertical drainage method characterized in that it comprises a second contaminant reaction portion that is filled between the first cover portion and the second cover portion and has a reactivity to the contaminants so that the contaminants in the gap water can be purified. File. The method of claim 7, wherein Lower ends of the first cover part and the first pollutant reaction part, Reactive column type vertical drainage method pile, characterized in that spaced apart a predetermined interval from the lower end of the second cover portion and the second contaminant reaction portion. The method of claim 7, wherein The second pollutant reaction unit, A file for reactive column type vertical drainage method, comprising at least one of steelmaking slag, zeolite, and sand satisfying a permeability coefficient of 10 ⁻³ to 10 ⁻¹ cm / sec. (a) forming a drain hole in the soft ground using a mandrel; (b) filling a predetermined region of the lower end of the drain hole with a reactive material having reactivity to the pollutant so that the pollutant in the gap water of the soft ground can be purified; (c) introducing a pile for the reactive column type vertical drainage process along the drain hole to be disposed above the reactive material; And (d) filling the reactive material into a space between the inner circumferential surface of the drain hole and the outer circumferential surface of the pile for the reactive column type vertical drainage method; The file for the reactive column type vertical drainage method, A hollow first cover part inserted through the drain hole and formed of an impermeable material that does not pass through the gap water of the soft ground; And And a first contaminant reaction part filled in the hollow part inside the first cover part and having a reactivity to the contaminant so that the contaminant in the pore water flowing from the lower side of the soft ground and moving upward is purified. A method for improving the soft ground using a pile for the reactive column type vertical drainage method. The method of claim 10, After step (d), (e) a reactive column further comprising the step of installing an impermeable material on the ground of the other part of the ground of the soft ground except for the portion where the reactive column-type vertical drainage method is disposed; Improvement method of soft ground using pile vertical drainage method. The method of claim 11, After step (e), To cover the upper surface of the order member and the upper surface of the reactive column-type vertical drainage process pile so that the gap number moved from the lower side to the upper side of the soft ground can be moved in a direction substantially parallel to the ground of the soft ground. Method for improving the soft ground using a pile for the reactive column type vertical drainage method, characterized in that it further comprises the step of installing a drainage mat. The method of claim 11, The order member, A method for improving soft ground using piles for reactive column type vertical drainage, characterized in that it is an impermeable geotextile.

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