KR101144348B1 - Drain Construction Method for Softclay Using Conductivity Drain Board - Google Patents

Abstract

The present invention relates to a method for promoting the drainage of a soft ground using a conductive drainage, and more particularly, by vertically embedding a conductive drainage containing a conductive material in the soft ground, and then energizing the vertically embedded conductive drainage of the conductive drainage. The present invention relates to a method for promoting the drainage of soft ground using a conductive drainage material that discharges the gap water present in the soft ground using the positive and negative charge coupling principle.
The soft ground drainage promotion method using the conductive drainage material according to the present invention prevents ground environmental contamination by corrosion of the existing electrode material by embedding the conductive drainage material, as well as reducing the solidification phenomenon around the electrode material and lowering the water permeability of the drainage material. In addition, the construction time can be improved by reducing the construction time and cost by inducing the early drainage and early settlement of the soft ground and shortening the consolidation drainage time due to the horizontal drainage effect.

Description

Drain Construction Method for Softclay Using Conductivity Drain Board}

The present invention relates to a method for promoting the drainage of a soft ground using a conductive drainage, and more particularly, by vertically embedding a conductive drainage containing a conductive material in the soft ground, and then energizing the vertically embedded conductive drainage of the conductive drainage. The present invention relates to a method for promoting the drainage of soft ground using a conductive drainage material that discharges the gap water present in the soft ground using the positive and negative charge coupling principle.

In general, the soft ground is a relative concept depending on the magnitude of the load that the ground can support. The soft ground is classified into soft ground if there is an excessive gap between the viscous granules and the viscous granules, and the main objective of the soft ground improvement method is to drain the excess ground water.

In this method of improving the soft ground, a replacement method for removing part or all of the soft layer and replacing it with high quality soil, a linear reworking method for promoting consolidation by loading (filling) a load of more than the design load in advance on the ground, and an appropriate interval in the ground Vertical drainage method to reduce horizontal drainage distance and promote consolidation, chemical liquid injection method to inject coagulant into the ground and solidify it, and electric osmosis to discharge pore water in the ground by using electric potential difference. Public law is enforced.

In the soft ground improvement method as described above, a vertical drainage method is installed in the soft ground at a suitable interval so as to shorten the horizontal drainage distance and promote consolidation. The vertical drainage method includes a plastic board drain method, a sand compaction pile method, a pack drain method, and the like. The most widely applied method is a plastic board drain method.

In the plastic board drain method, as shown in FIG. 1, a permeable mat 3 and a sand drainage layer 2 are installed on the soft ground 4, and a predetermined interval 1 penetrates through the soft ground 4. ~ 2m) When the drainage material (or drainboard) 9 is inserted vertically, the moisture in the soft ground is discharged to the sand drainage layer 2 along the core material 13 due to the capillary phenomenon of the drainage material. As the method of increasing the strength of the ground, the permeability of the drainage material is drained together with fine-grained sediment and pore water, which is very limited in time, resulting in long-term permissible settlement of the soft ground, causing fatal defects on various permanent structures. There is a risk of collapse and conduction of earthwork structures due to abnormal earth pressure due to collapse and insufficient drainage in the earthwork structures in the long term.

On the other hand, in the electroosmotic drainage method, as shown in FIG. 2, a permeable mat 3 and a sand drainage layer 2 are installed on the soft ground 4, and the sand pillar 8 is disposed in the soft ground 4. Forming and installing a negative electrode (7) therein, and by installing a positive electrode (6) at a predetermined interval around the negative electrode rod to supply an external power source (5) to the electrode poles the number of gaps present in the soft ground It moves from the (cathode) to the cathode (anode) and is discharged to the top of the sand drainage layer, and the method of hardening the ground due to the settlement of the ground due to the discharge of the gap water. Such an electroosmotic drainage method may be effective in short-term construction, but may cause ground environmental pollution due to solidification phenomenon around the electrode material and corrosion of the electrode material caused by consolidation period during long-term construction.

Thus, Korean Patent No. 10-0172585 discloses an electroosmotic load drain consolidation apparatus and a method using geosynthetic fibers, but since the drainage layer is made of a sand column in which electrodes are inserted, the construction period takes a long time and a large amount of high quality sand There is a difficulty in securing the material as needed.

In addition, the Republic of Korea Patent No. 10-0491784 discloses a method for promoting the drainage of the soft ground using a drainage material covered with an anion filter cloth, an anion filter cloth is produced by adhering an anion ore powder with a hydrophilic adhesive, anion filter cloth excess gap water There is a problem in that the amount of negative ions generated is insufficient to reduce the drainage efficiency, and when the anion filter cloth absorbs the excess pore water, the anion ore powder of the filter cloth flows into the excess pore water so that the drainer cannot properly function.

Accordingly, the present inventors have made efforts to solve the problems of the prior art, as a result of the conductive material contained in the core material and / or filter material used in the conventional vertical draining method to produce a conductive drain material, using the produced conductive drain material When embedded in the soft ground, and then energized by an external power source, it was confirmed that the construction efficiency is improved by improving the submerged section of the soft ground due to early drainage and early settlement of the soft ground, and completed the present invention.

An object of the present invention is to provide a soft ground drainage promoting method using a conductive drainage material that prevents corrosion of the electrode material and blockage of the filter material, and enables early drainage and early settling to improve construction efficiency.

In order to achieve the above object, the present invention comprises the steps of (a) installing a water-permeable mat on the soft ground, then laying a horizontal drainage layer to form a horizontal drainage layer; (b) vertically placing conductive drainage material through the horizontal drainage layer at a predetermined interval on the soft ground; And (c) provides a method for promoting the drainage of the soft ground using a conductive drainage, comprising the step of discharging the gap water by applying an external power source to the conductive drainage protruding to the horizontal drainage layer.

The soft ground drainage promotion method using the conductive drainage material according to the present invention prevents ground environmental contamination by corrosion of the existing electrode material by embedding the conductive drainage material, as well as reducing the solidification phenomenon around the electrode material and lowering the water permeability of the drainage material. In addition, the construction time can be improved by reducing the construction time and cost by inducing the early drainage and early settlement of the soft ground and shortening the consolidation drainage time due to the horizontal drainage effect.

1 is an exemplary view of a soft ground drainage promotion method using a conventional drain board.
Figure 2 is an illustration of a soft ground drainage promotion method using a conventional electroosmotic consolidation method.
Figure 3 is an illustration of a soft ground drainage promotion method using a conductive drainage material according to the present invention.
4 is an exemplary view of a conductive drain material according to the present invention.
Figure 5 is an exemplary view of the core material of the conductive drainage material according to the present invention, (a) is harmonica type, (b) is concave-convex type, (c) is filament type.
6 is an exemplary view illustrating the construction of a conductive drainage material according to the present invention.
7 is a layout view of the conductive drainage according to the present invention, (a) is a triangular layout of the conductive drainage, (b) is a rectangular layout of the conductive drainage.
8 is a comparative graph according to the conduction treatment of the soft ground drainage promotion method using the conductive drainage according to the present invention, (a) is a settlement comparison graph, (b) a water content comparison graph, (c) consolidation drainage comparison graph and (d ) Shear strength comparison graph.
9 is a comparative graph according to the voltage change of the soft ground drainage promotion method using the conductive drainage according to the present invention, (a) is a settlement comparison graph, (b) a water content comparison graph, (c) consolidation drainage comparison graph and (d ) Shear strength comparison graph.

The present invention comprises the steps of: (a) installing a water-permeable mat on the soft ground, then installing a horizontal drainage layer to form a horizontal drainage layer; (b) vertically placing conductive drainage material through the horizontal drainage layer at a predetermined interval on the soft ground; And (c) relates to a method for promoting the drainage of the soft ground using a conductive drainage, comprising the step of discharging the gap water by energizing an external power source to the conductive drainage protruding above the horizontal drainage layer.

Specifically, in the soft ground drainage promoting method using the conductive drainage of the present invention by using the conductive drainage can reduce the corrosion of the electrode material and the solidification around the electrode material generated in the existing electroosmotic drainage method, By using the combined principle of positive and negative charges to facilitate the discharge of gap water from the soft ground, early drainage and early settling are possible, thereby reducing the water-permeability degradation caused by the long-term plastic board drain process.

In addition, the construction is based on the plastic board draining method that embeds a good permeability drainage into the soft ground, so that it can be applied to super soft ground, minimizes disturbance of surrounding ground, and the construction equipment is small and light, even in soft ground. It is possible to work and at the same time obtain the effect of electroosmotic drainage method, that is, shorten drainage time to increase the rate of consolidation settlement, and as the consolidation progresses not only the engineering properties of the soil are established but also the electrochemical reaction of soil and conductive drainage. The effect of increasing the shear strength of the base can be obtained.

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

3 and 4 is an exemplary view of a conductive drain material according to the present invention.

The conductive drainage material 1 according to the present invention includes a conductive core material 10 and a conductive filter material 11 surrounding the conductive core material 10, and the conductive core material 10 and the conductive filter material 11. The conductive core may include the conductive material in the core material and / or the filter material, or the conductive member 12 may be inserted into the conventional drain material 9 to manufacture the conductive drain material 1.

In the present invention, the conductive core material 10 is an extruded product consisting of harmonica type (Fig. 5a), concave-convex type (Fig. 5b) and filament type (Fig. 5c), having a large drainage capacity, filtration area and strength, low temperature and Any material can be used as long as it has good workability at high temperature, good flexibility, and durability that does not cause shrinkage or deformation due to moisture, and is preferably selected from the group consisting of polypropylene, polystyrene, polyethylene, and mixtures thereof. Can be.

In the present invention, the conductive filter material 11 is in the form of a nonwoven fabric or a web, any material can be used as long as it has a high tensile strength and excellent water permeability and filtration effect, preferably polyester, polyethylene terephthalate, polystyrene, nylon , Viscose rayon and mixtures thereof.

The conductive material capable of imparting conductivity to the conductive drainage material 1 according to the present invention may be selected from the group consisting of conductive polymers, conductive metals, conductive fillers and mixtures thereof.

In the present invention, the conductive polymer is polyaniline, polypyrrole, polythiotene, poly (3,4-ethylenethiophene), poly (3,4-ethylenedioxythiophene), polystyrenesulfonate, polyacetylene, polyisocyanaphthalene, Polyethylene dioxythiophene, polyparaphenylene vinylene, poly (2,5-dialkoxy) paraphenylene vinylene, polyparaphenylene, polyheptadiene and mixtures thereof.

In addition, in the present invention, the conductive metal may be selected from the group consisting of gold, silver, copper, nickel, zinc and alloys thereof, and the conductive filler may be carbon black, carbon nanotubes, carbon fibers, graphite, titanium oxide. , Aluminum oxide, tin oxide, tetraethylammonium, tetrabutylammonium, octadecyltrimethylammonium, dodecyltrimethylammonium, and mixtures thereof.

In the present invention, the conductive drainage material 1 is based on 100 parts by weight of the conductive material, 55 parts by weight to 70 parts by weight of the conductive polymer, 10 parts by weight to 15 parts by weight of the binder, 1 part by weight of the dispersing agent to assist the dispersion of the composition components ~ 5 parts by weight and 15 parts by weight to 30 parts by weight of solvent are coated, impregnated and deposited by various coating methods such as gravure, roll, comma, and micro gravure on the surface of the drainage material, or when manufacturing drainage material, the conductivity specified above in the raw material of the drainage material. The metal is produced by internally adding 1 part by weight to 30 parts by weight with respect to 100 parts by weight of raw materials for drainage.

In addition, as shown in Figure 4, the conductive drainage material 1 of the present invention is coated with a conductive material as described above in the existing drainage material, or 1 to 30 parts by weight based on 100 parts by weight of the conductive metal or filler A conductive drainage material may be manufactured by inserting a conductive member 12 such as a conductive film, a conductive nonwoven fabric, and the like, which is internally treated.

In the present invention, the binder may be selected from the group consisting of modified curable silicone resins, acrylic-urethane hybrid resins and mixtures thereof modified with organic materials such as urethane resins, epoxy resins, acrylic resins or alkyd resins.

In the present invention, the solvent is polar such as dimethyl sulfoxide (DMSO), dimethylformamide (DMF), N-methyl-2-pyrrolidinone (NMP), 2-butanone, 4-methyl-2-pentanone and the like. The organic solvent may be selected from the group consisting of methyl alcohol, ethyl alcohol, isopropyl alcohol, isobutyl alcohol, t-butyl alcohol, benzyl alcohol, ethylene glycol and mixtures thereof.

In the present invention, the dispersant is a surfactant such as alkyl benzene sulfonate, α-olefin sulfonate, alkyl sulfate ester salt, alkyl ether sulfate ester salt, alkanesulfonate salt, polyethylene glycol derivative, fluorine surfactant, silicone surfactant, stearic acid , Amine dispersants and mixtures thereof.

Hereinafter, the construction process of the drainage promotion method of the soft ground using the present invention.

First, geotechnical fibers with even grounding of the soft ground (4) are carried out, and the soft ground (4) and the horizontal drainage layer (2) do not mix on the ground of the soft ground, the excellent permeability, geosynthetic fibers with high tensile strength After the water-permeable mat (3), such as synthetic resin, is installed, the horizontal drainage layer (2) is laid to form a horizontal drainage layer. The horizontal drainage layer 2 may be formed by laying sand on the soft ground (FIG. 6).

A casing (not shown) made of a steel pipe (not shown) is formed in order to vertically cast the conductive drainage material 1 manufactured by the above-described method through the horizontal drainage layer 2 formed as described above. In the state in which the conductive drainage material 1 is inserted into the inside thereof, the steel pipe is inserted into the required depth while maintaining the vertical degree into the soft ground 4 by using vibration or hydraulic method, and then casing to the required depth. If it is confirmed that the penetration of the (not shown) is made by removing the casing (not shown) to the outside of the soft ground to remove the conductive drainage to the required depth of the soft ground (4).

Here, the number, spacing interval and depth of the conductive drainage of the conductive drainage 1 can be adjusted according to the conditions of the soft ground, preferably can be arranged in a triangle (Fig. 7a) or a rectangle (Fig. 7b), the consolidation process By changing the middle electrodes (+,-), the settlement speed of the soft ground can be increased.

As described above, by applying an external power source 5 for supplying power of different polarities to a portion protruding upward from the horizontal drainage layer 2 of the conductive drainage 1 vertically cast at a predetermined interval on the soft ground, the conductive drainage material ( Due to the coupling of the positive and negative charges or the voltage difference generated in 1), the gap water inside the soft ground 4 is absorbed by the filter material in the drainage material, and the gap water absorbed by the conductive filter material 12 is a capillary tube of the conductive core material 11. The phenomenon is raised upward along the conductive core material 11. The gap water discharged through the conductive core material 11 is discharged to the outside of the soft ground 4 through the horizontal drainage layer 2.

In the present invention, the external power source 5 may be efficiently determined in consideration of the soft ground condition, the composition mineral type, the type interval, the time of consolidation settlement, etc., but preferably 1V to 50V may be applied. This causes a problem that the drainage effect is reduced when the external power supply is less than 1V, and the drainage effect may be increased when it exceeds 20V, but a problem may occur in terms of safety management.

The drainage promotion method of the soft ground using the conductive drainage according to the present invention forms a horizontal drainage layer compared to the existing electroosmotic drainage method, thereby shortening the drainage distance to promote consolidation settlement and causing excess pore water pressure to drainage capacity and shear strength. By using a conductive drainage material, sand consumption can be reduced compared to the existing electroosmotic drainage method, it can prevent ground environmental pollution by electrode material corrosion, and it can prevent the solidification phenomenon around electrode material. Can be.

Meanwhile, the method for promoting drainage of the soft ground using the conductive drainage according to the present invention uses the conductive drainage as compared to the conventional plastic board drainage method, thereby improving the properties of the soil as the consolidation progresses, and the electrochemical properties of the soil and the conductive drainage. As a result, the shear strength of the ground can be increased by the reaction, and the ground improvement effect can be obtained. As a result, the drainage time and the consolidation time can be shortened, thereby reducing the construction time and reducing the construction time and cost.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention, and it will be apparent to those skilled in the art that the present invention is not to be construed as limited by these examples.

Example  1: conductivity Drainage  Drainage promotion method of soft ground using

1-1: conductive film Filter material  Inserted conductivity Drainage  Drainage promotion method of soft ground using

A model soft ground is made by mixing soil and water in a reactor made of acrylic (170mm × 270mm × 250mm), and sputtering method of indium tin oxide (ITO) inside the filter material of the conventional vertical drainage method. After producing a conductive drainage material inserted into the film deposited with a thickness of 25nm in PET, the produced conductive drainage was embedded in the model soft ground and then applied with a power of 7V.

1 -2: Performance Evaluation of Drainage Promoting Method of Soft Ground Using Conductive Drainer Coated with Conductive Polymer in Core Material and Filter Material

13 wt% of water-soluble acrylic-urethane hybrid resin (Hybridur 540, Air Product Co.) as a water-soluble binder in 70 wt% of Baytron PH (Bayer Co.) containing poly (3,4-ethylenedioxythiophene) and polystyrenesulfonate 2% by weight of dispersing agent (disperbyk 110, BYK Co.), 5% by weight of distilled water and 10% by weight of isopropyl alcohol, and then the mixture is coated on both sides of the core material and filter material of the conventional vertical draining method to produce a conductive drainage material. Then, the prepared conductive drainage material was inserted into the same soft ground as in Example 1-1, and then a power of 7V was applied.

1-3: In the core material  conductivity Filler Internal  conductivity Drainage  Performance Evaluation of Drainage Promoting Method of Soft Ground Using

The conductive drain material produced by adding 10 wt% of copper filler to the core material of the conventional vertical drainage method was inserted into the same soft ground as in Example 1-1, and then a power of 7V was applied.

1-4: Filter material  Conductive metal deposited Drainage  Performance Evaluation of Drainage Promoting Method of Soft Ground Using

The conductive drain material produced by depositing copper on the filter material of the conventional vertical drainage method was inserted into the same model soft ground as in Example 1-1, and 7V power was applied thereto.

1-5: Core  And Filter material  conductivity Filler Internal  conductivity Drainage  Performance Evaluation of Drainage Promoting Method of Soft Ground Using

A conductive drain material produced by adding 10 wt% of copper filler to the core material and filter material of the conventional vertical drainage method was inserted into the same model soft ground as in Example 1-1, and then a power of 7V was applied.

Comparative example  1: normal plastic Board Drain  Performance evaluation of construction method

In the same model soft ground as in Example 1-1, a drainage material of the conventional vertical drainage method, which was not subjected to conductive treatment at both ends, was embedded.

Experimental Example  1: conductivity Drainage  Evaluation of Efficiency of Drainage Promoting Method Using Soft Ground

1-1: conductive In drainage  Following settlement, Water content , Consolidation  And Shear strength  evaluation

A power supply of 7 V was applied to the drains of the examples and the comparative examples, and after 24 hours, the change in settlement amount, water content change, consolidation drainage amount, and shear strength were measured.

As a result, as shown in Table 1 and Figure 8, Example 5 is about 3.8 times better in the settlement, about 2.4 times in the water content, about 2.0 times in the consolidation drainage, about 3.7 times better in shear strength than the comparative example appear.

In addition, it was found that imparting conductivity to both the core material and the filter material rather than providing the conductivity alone to the core material and the filter material alone showed excellent settlement, water content, consolidation drainage, and shear strength. It was found that imparting conductivity by adding internally rather than coating method showed superior settlement, moisture content, consolidation drainage and shear strength.

Item Comparative example Example 1 Example 2 Example 3 Example 4 Example 5 Settlement change 7.6mm 11.8mm 10.5mm 18.1mm 23.8 mm 28.5mm Water content change 9.9% 15.5% 13.9% 17.3% 19.8% 23.4% Consolidation multiple change 635 ml 665 ml 657ml 862 ml 956 ml 1.270ml Shear strength change 0.23 kpa 0.37 kpa 0.32 kpa 0.59 kpa 0.68 kpa 0.85 kpa

1-2: settlement amount according to the voltage change, Water content , Consolidation  And Shear strength  evaluation

The power of 0V, 3V, 5V, and 7V was applied to the wastewater of Example 1-5, and after 24 hours, the change of settlement amount, water content change, consolidation drainage amount, and shear strength were measured.

As a result, as shown in Table 2 and Figure 9, as the voltage applied to the drainage increases, the settlement amount, water content, consolidation drainage amount and shear strength can be seen that the water is well discharged from the model soft ground.

Item 0 V 3 V 5 V 7 V Settlement change 7.9 mm 12.6mm 16.9 mm 28.5mm Water content change 9.5% 13.8% 17.6% 23.4% Consolidation multiple change 629ml 785 ml 862 ml 1270ml Shear strength change 0.25kpa 0.38kpa 0.59 kpa 0.85 kpa

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereby. something to do. Thus, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

1: conductive drainage 2: horizontal drainage layer
3: permeable mat 4: soft ground
5: external power source 6: positive electrode
7: negative electrode 8: sand column
9: drainage material (drainboard) 10: conductive core material
11: conductive filter material 12: conductive member
13: core material 14: filter material

Claims (10)

A method for promoting drainage of soft ground using conductive drainage, comprising the following steps:
(a) installing a water-permeable mat on top of the soft ground, and then forming a horizontal drainage layer;
(b) vertically placing conductive drain material containing 1 part by weight to 30 parts by weight of copper filler with respect to 100 parts by weight of the drain material including a core material and a filter material surrounding the core material through the horizontal drainage layer at predetermined intervals at a predetermined interval. Making; And
(c) discharging the gap water by energizing an external power source to the conductive drainage material protruding above the horizontal drainage layer.
delete delete delete delete delete The method of claim 1, wherein the core material is selected from the group consisting of polypropylene, polystyrene, polyethylene, and mixtures thereof.
The method of claim 1, wherein the filter material is selected from the group consisting of polyester, polyethylene terephthalate, polystyrene, nylon, viscose rayon, and mixtures thereof.
The method of claim 1, wherein the step (b) further comprises the step of performing a site stop to evenly ground the soft ground before installing the permeable mat on the soft ground of the soft ground using a conductive drainage material Drainage promotion method.
The method of claim 1, wherein the external power source of step (c) is a voltage of 1V ~ 20V to promote the drainage of the soft ground using a conductive drainage.

Images