KR20130131108A

KR20130131108A - Construction method for foundation using soil stabilizer

Info

Publication number: KR20130131108A
Application number: KR1020120054914A
Authority: KR
Inventors: 송기용
Original assignee: 스키너스 주식회사
Priority date: 2012-05-23
Filing date: 2012-05-23
Publication date: 2013-12-03

Abstract

The present invention provides a foundation construction method using a soil stabilizer comprising a mounding step of forming a mounding unit (100) by mounding earth and sand in a backfill area behind a building (10); a boring step of forming multiple boring holes by boring the mounding unit (100) upward and downward; a multi-layer processing step of forming multiple piles (200) by injecting the earth and sand and the soil stabilizer into the multiple boring holes; and a surface processing step of forming a reinforcing surface layer (300) by mixing and spreading the earth and sand and the soil stabilizer on the surface of the mounding unit (100) in order to reduce a construction period and to obtain enough strength by effectively solidifying the soil generated at a construction field and by-product waste soil.

Description

Basic method using soil hardener {CONSTRUCTION METHOD FOR FOUNDATION USING SOIL STABILIZER}

The present invention relates to the field of civil engineering, and in particular, to a method for constructing a foundation structure.

In the case of constructing a plurality of structures for non-flat ground, it often occurs that each structure forms a stepped structure with each other.

1 is a cross-sectional view showing a case in which the foundation structure is formed behind the building 10 constructed on the lower ground, and another structure is formed on the upper ground above it.

As shown, a solid foundation must be formed in the backfill area between the back of the building 10 and the ground (or cut surface 20), so that another structure can be constructed thereon.

Conventionally, in order to form a basic structure in such a backfill region, a method of repeatedly repeating the process of filling the soil with a thickness of about 30 cm and then compacting and then filling the soil with the same thickness thereon and compacting again has been applied.

However, such a conventional method has a problem such that it takes too much time to repeat the filling and compaction, and if the quality of the field-produced soil is not good, because the poor compaction occurs, it is necessary to bring good quality soil from outside .

The present invention was derived to solve the above problems, and to provide a basic method using a soil hardener to shorten the construction period, to effectively solidify the on-site soil or by-product waste earth to exhibit sufficient strength The purpose.

In order to solve the above problems, the present invention comprises a filling step of forming the filling section 100 by filling the earth and sand in the back-filling area behind the building (10); A perforating step of perforating the fill portion 100 in a vertical direction to form a plurality of perforation holes; Middle layer processing step of forming a plurality of piles (200) by injecting mixed soil and soil hardener in the plurality of drilling holes; It proposes a basic method using a soil hardener comprising a; surface treatment step of forming a reinforcing surface layer 300 by mixing and coating the soil and the soil hardener on the surface of the fill portion (100).

The drilling step is preferably performed so that the lower end of the drilling hole reaches the base plate 20 or the lower portion of the backfill region.

The earth and sand is preferably floating soil generated in the drilling step.

The soil toughening agent comprises 22.4 to 35.7 parts by weight of calcium chloride, 12 to 26 parts by weight of ammonium chloride, 21.42 to 34.68 parts by weight of magnesium chloride, 1.2 to 7 parts by weight of magnesium sulfate, 8 to 13 parts by weight of sodium aluminate, To 10 parts by weight, magnesium stearate 2.5 to 3.5 parts by weight, and divalent iron compound 1 to 2 parts by weight.

It is preferable to mix 1 to 2 kg of the soil solidifying agent and 70 to 100 kg of the binder with 1 m 3 of the soil to solidify it.

It is preferable to mix 30 to 35 liters of the aqueous solution of the soil stabilizer with respect to 1 m 3 of the soil.

The binder preferably includes 30 to 40 parts by weight of cement, 50 to 60 parts by weight of slag or fly ash, and 5 to 15 parts by weight of gypsum.

It is preferable that the soil solidifying agent is solidified by mixing 0.7 to 1.5 kg of the soil solidifying agent, 100 to 200 kg of the binder, 20 to 25 parts by weight of fly ash or 20 to 25 parts by weight of the stone powder per 1 m 3 of the soil.

It is preferable to further solidify 60 to 90 L of liquid sodium silicate by mixing.

It is preferable to add 1 to 5 L of an aqueous solution of 3 to 5 parts by weight of an emulsion solution obtained by mixing a methacrylic resin and a silica-based solidifying agent to 1 m 3 of the soil.

The present invention shortens the construction period, and proposes a basic method using a soil hardener to effectively solidify field-produced soil or by-product waste soil to exhibit sufficient strength.

1 is a cross-sectional view of a conventional construction method.
2 to 4 is a process chart of an embodiment of the process according to the present invention.

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

As shown in Figure 2 below, the basic method using the soil hardener according to the present invention, basically, the filling step of forming the filling section 100 by filling the earth and sand in the back-filled area behind the building (10); Drilling step of drilling the fill portion 100 in the vertical direction to form a plurality of drilling holes; Middle layer processing step of forming a plurality of piles (200) by injecting a mixture of soil and soil hardener in a plurality of drilling holes; It is configured to include; surface layer treatment step of forming a reinforcement surface layer 300 by mixing and coating the soil and the soil hardener on the surface of the fill portion (100).

That is, as in the conventional method, a separate compaction step is omitted, a pile is formed using a soil hardener after the filling step, and a reinforcing surface layer is formed on the soil hardener again.

The solidified body formed by mixing the soil and the soil hardener does not have the strength as concrete, but may exhibit sufficient strength in forming the basic structure for reinforcing the ground.

Furthermore, in the construction method according to the present invention, since the double structure of the pile and the reinforcement surface layer formed by the above solidified body is taken, it is possible to achieve a more stable structure than the basic structure formed by the filling and compaction of the soil.

Therefore, it is possible to shorten the construction period, and to effectively solidify on-site generated soil or by-product waste soil, so that sufficient strength can be exerted. Therefore, it is not necessary to bring in external soil.

The drilling hole formed by the drilling step is performed so that the lower end reaches the base plate 20 or the lower part of the backfill area, so that the lower end of the pile 200 formed in the drilling hole is supported by the base plate 20. It is desirable for structural stability.

Here, the ground ground 20 refers to the original ground formed at the lower portion of the fill portion 100, and includes a cut surface and the like.

Soil mixed with soil hardener is sufficient to apply on-site soil, and it may be possible to use flotation soil generated in the drilling stage after filling.

Hereinafter, the soil strengthening agent used in the method according to the present invention will be described.

The soil stabilizer is basically composed of 22.4 to 35.7 parts by weight of calcium chloride, 12 to 26 parts by weight of ammonium chloride, 21.42 to 34.68 parts by weight of magnesium chloride, 1.2 to 7 parts by weight of magnesium sulfate, 8 to 13 parts by weight of sodium aluminate, 4 to 10 parts by weight of an acid salt, 2.5 to 3.5 parts by weight of magnesium stearate, and 1 to 2 parts by weight of a divalent iron compound such as iron sulfate.

In the case of high quality soil, it is possible to obtain a compressive strength of 20 kgf / cm 2 or more, excellent freezing and thawing property, and impermeability only by mixing 1 to 2 kg of the above soil strengthening agent and 70 to 100 kg of a binder containing cement, .

At this time, it is sufficient to apply 8 to 11 parts by weight of soda alkalate and 4 to 7 parts by weight of ligrin sulfonate.

Here, the soil hardener is in the form of an aqueous solution, it is preferable to incorporate 30 ~ 35L per 1 m 3 of the soil for the construction and structural stability.

As a binder, only cement may be applied, but when the composition includes 30 to 40 parts by weight of cement, 50 to 60 parts by weight of slag or fly ash, and 5 to 15 parts by weight of gypsum, better properties may be obtained. It may be provided in the form of a pre-mix by incorporation with a solidifying agent.

In the case of soils containing a large amount of by-product waste soil (soft clayey soil, waste micro-soil, marble, sludge, sludge, etc.), 0.7-1.5 kg of the above soil stabilizer, 100-200 kg of binder, Fly ash) or 20 to 25 parts by weight of the abrasive grains are mixed and solidified.

Fly ash or stone powder is an inorganic material that is soil aggregate and plays a role of reinforcement material. Therefore, when a large amount of by-product waste earth is present, it is mixed with soil with a hardener, so that the compressive strength, tensile strength, abrasion resistance, freeze-thawing It serves to provide a granular material having excellent properties.

In addition, when 60 to 90 L of liquid sodium silicate is further added to 1 m 3 of soil, more excellent solidification effect can be obtained.

The alkali component (Na2O) contained in the liquid sodium silicate (Na2O-nSiO2-xH2O) activates the silica component contained in the pozzolan, and forms the silica or the anion moiety with the calcium silicate compound.

This shortens the gel time between the soil, cement and sodium silicate so that it has the properties of the fastener.

Particularly, since the liquid sodium silicate modified with sodium silicate (3 sec. Succulent) corresponds to a strong alkaline aqueous solution having a low molar ratio (2.0 to 2.5), the water-resistant property of sodium silicate can be obtained, Since it is composed of SiO2, Al2O3, Fl2O3, CaO or the like as a main component, a permanent structure by a strongly bonded cured body can be obtained.

Accordingly, the liquid sodium silicate increases pozzolanic reactivity, thereby obtaining effects such as early strength expression, hardening promotion, and excellent durability.

Item 3 types (No. 3) Specific gravity (20 ℃) 1.380 or more Silicon Dioxide (SiO2) (%) 28 to 30 Sodium oxide (Na2O) (%) 9-10 Fe (%) 0.03 or less Mole rain 2.0 ~ 2.5

Table 1 shows the physical properties of the liquid sodium silicate (KS M 1415).

Even in the case of this embodiment, only the cement may be used as the binder, but when the composition including 30 to 40 parts by weight of cement, 50 to 60 parts by weight of slag or fly ash, and 5 to 15 parts by weight of gypsum is obtained, And they can be incorporated in the pre-mix form with the stomach soil stiffening agent.

In the case of the soft ground, only 1 ~ 3 kg of soil, 1 ~ 2 kg of the soil soil strengthening agent and 70 ~ 100 kg of the binder containing cement are mixed and solidified to achieve a compressive strength of 10 to 50 kgf / (Permeability coefficient 1 x 10-7 cm / sec) can be obtained.

In the case of soft viscous soils and clay coarse clays, high molecular weight compounds are dispersed in organic matter (Humic acid) and are dissolved in the adhering water around the granules. There is a problem of forming an impermeable membrane on the surface of the cement hydrate by reacting with calcium ions.

In this embodiment, soil stabilizers use 11.1 to 13 parts by weight of sodium aluminate and 7.1 to 10 parts by weight of leucine sulfonate, which improves the uniformity of the soft soil particles and improves the bonding of the soft soil and induces a stable hydration reaction Feature.

In addition to the above soil solidifying agent, when adding 3 ~ 5 parts by weight of the aqueous solution of the emulsion solution mixed with the methacrylic resin and the silica-based hardener 1 ~ 5L, the three-dimensional network structure is formed by the chemical bond between the granules crosslinking curing reaction This further promotes the advantage.

Hereinafter, test examples for demonstrating the effects of the method of the present invention and the soil strengthening agent will be described.

29.4 parts by weight of calcium chloride, 20 parts by weight of ammonium chloride, 28 parts by weight of magnesium chloride, 3 parts by weight of magnesium sulfate, 9 parts by weight of sodium aluminate, 6 parts by weight of lignin sulfonate, 3 parts by weight of magnesium stearate, 1.6 parts by weight.

The specimens were prepared by adding 1kg / ㎥ to the target soil.

Based on the waste process test standard (Ministry of the Environment Notice No. 2011-3), the following relevant standards were applied.

KS F 2302 Particle size test method

KS F 2303 Liquid Limit, Firing Limit Test Method

KS F 2306 Water content test method

KS F 2308 Density test method of soil

KS F 2312 Compaction test method of soil

KS F 2322 Test method of soil permeability

KS F 2324 Classification of soil engineering

KS F 2328 Compressive strength test method of soil-cement

How to make and cure specimens for soil-cement compression and strength test in KS F 2329 test room

KS F 2331 Relationship between water content and density of soil-cement mixture Test method

For the cement, Portland cement (OPC), which is one kind of domestic cement, was used. For the target soil, 2mm sieve, density of 2.615, chloride content of 0.02%, SM were used and general tap water was used.

The combination of the solidifying agent and the cement according to the present invention was as follows.

(Unit: kg / m ³ ) No. Name of sample Unit Cement Amount Target Sat Binders 5000 One C70B1 70 2571 One 2 C80B1 80 2563 One 3 C100B1 100 2546 One

Here, C70B1 means that 70kg of cement and 1kg of solidifying agent are mixed into 1㎥ of soil, and C80B1 means that 80kg of cement and 1kg of solidifying agent are mixed into 1㎥ of soil.

Compressive strength tests were carried out at 3, 7 and 28 days compressive strength test according to KS F 2328 using hydraulic compressive tester with addition of solidifying agent in soil - cement specimens.

For the permeability test, C70B1 was applied based on KS F 2322 and the permeability test was carried out according to the presence or absence of the solidifying agent in the soil - cement specimens.

Toxic substances the dissolution profile test are the waste process test criteria (MOE Notice No. 2011-3) tests Pd, Cd, Cr ⁺ ^6, Cu, Hg, As, CN using a solidifying agent of the present invention according ^to-the organic , Trichlorethylene, tetrachlorethylene, and oil components were tested for the presence or absence of hazardous substances.

According to KS F 2331 test method, the maximum dry density and optimum water content according to the amount of unit cement are as follows.

No. Unit Cement Amount (kg / m ³ ) Maximum dry density (kg / m ³ ) Optimum water content (%) One 50 1928 9.8 2 70 1933 9.7 3 75 1935 9.7 4 80 1936 9.7 5 90 1939 9.6 6 100 1942 9.5 7 120 1946 9.5 8 150 1955 9.3 9 200 1972 9.0

The relationship between the maximum dry density and the optimal water content for the unit cement amount is shown in the graph of FIG.

The compressive strength was tested in accordance with KS F 2328, and the results of the compressive strength tests at 3, 7 and 28 days were as follows according to the addition of soil strengthening agent in soil - cement specimens.

No. Name of sample Compressive strength (MPa) 3 days 7 days 28th One C70B0 0.2 0.7 1.0 2 C70B1 0.6 1.0 1.6 3 C100B0 1.1 1.4 - 4 C100B1 1.2 1.8 - 5 C120B0 1.5 2.1 - 6 C120B1 1.5 2.5 -

Here, C70B0 means that 70kg of cement and 0kg of solidifying agent are mixed into 1㎥ of soil, and C100B0 means that 100kg of cement and 0kg of solidifying agent are mixed into 1㎥ of soil.

The permeability test was carried out on the specimens of 5 days of age using the combination of C70B0 and C70B1 based on KS F 2322. The results of the permeability coefficient (k) test are as follows.

division Permeability Coefficient (cm / s) C70B0 6.1 × 10 ^-5 C70B1 2.5 x 10 ^-5

Cd, Cr ⁶ ⁺ , Cu, Hg, As, CN ^- , organic phosphorus, trichlorethylene, tetrachlorethylene, and the like were tested using a solidifying agent according to the waste process test standard (Ministry of the Environment Notice No. 2011-3) The following results were obtained by conducting a leaching test for harmful substances against oil components and the like.

Test Items unit Test result Test Methods Pd mg / L Not detected Waste process test standard
(Ministry of Environment Notice No. 2011-3) CD mg / L Not detected Waste process test standard
(Ministry of Environment Notice No. 2011-3) Cr ⁶ ⁺ mg / L Not detected Waste process test standard
(Ministry of Environment Notice No. 2011-3) Cu mg / L Not detected Waste process test standard
(Ministry of Environment Notice No. 2011-3) Hg mg / L Not detected Waste process test standard
(Ministry of Environment Notice No. 2011-3) As mg / L Not detected Waste process test standard
(Ministry of Environment Notice No. 2011-3) CN ^- mg / L Not detected Waste process test standard
(Ministry of Environment Notice No. 2011-3) Organic phosphorus mg / L Not detected Waste process test standard
(Ministry of Environment Notice No. 2011-3) Trichlorethylene mg / L Not detected Waste process test standard
(Ministry of Environment Notice No. 2011-3) Tetrachlorethylene mg / L Not detected Waste process test standard
(Ministry of Environment Notice No. 2011-3) Oil component mg / kg Not detected Waste process test standard
(Ministry of Environment Notice No. 2011-3)

The direct image analysis was performed on images taken at a magnification of × 100 after surface polishing of the C70B0 and C70B1 test specimens, and the cross sections were as shown in the photographs of FIGS.

Figs. 2 and 3 relate to C70B0, and Figs. 4 and 5 relate to C70B1.

As a result of the test, the compressive strength of the soil-cement specimen due to the addition of the solidifying agent according to the present invention was 1.6MPa in which the compressive strength was increased by 60% at the age of 28 days C70B1, 1.8MPa , And the compressive strength of C100B1 was increased by 19% to 2.5 MPa.

The permeation coefficient of C70B1 according to the present invention was found to be 2.5 × 10 ^-5 cm / s, which was 40% lower than that of C70B0.

Hazardous Material eluted according to the solidifying agent added in accordance with the present invention test results Pd, Cd, Cr ^6+, Cu, Hg, As, CN ^-, 11 gaji tests such as organophosphorus, trichlorethylene, tetrachlorethylene, oil And no leakage of harmful substances.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

10: building 20: base plate
100: fill 200: file
300: reinforcement surface layer

Claims

Filling step of filling the earth and sand in the back-filled area behind the building (10) to form the fill portion 100;
A perforating step of perforating the fill portion 100 in a vertical direction to form a plurality of perforation holes;
Middle layer processing step of forming a plurality of piles (200) by injecting mixed soil and soil hardener in the plurality of drilling holes;
A surface layer treatment step of forming a reinforcement surface layer 300 by mixing and coating the soil and the soil hardener on the surface of the fill portion 100;
Basic method using soil hardener containing.

The method of claim 1,
The drilling step is a foundation method using a soil hardener, characterized in that the lower end of the drilling hole is carried out to reach the base plate 20 or the lower portion of the backfill region.

The method of claim 1,
The earth and sand is a foundation method using a soil hardener, characterized in that the floating soil generated in the drilling step.

The method of claim 1,
The soil-
22.4 to 35.7 parts by weight of calcium chloride, 12 to 26 parts by weight of ammonium chloride, 21.42 to 34.68 parts by weight of magnesium chloride, 1.2 to 7 parts by weight of magnesium sulfate, 8 to 13 parts by weight of soda aluminate, 4 to 10 parts by weight of ligline sulfonate, 2.5 to 3.5 parts by weight of magnesium stearate, and 1 to 2 parts by weight of a divalent iron compound.

5. The method of claim 4,
A basic method using a soil hardener, characterized in that by mixing 1 ~ 2kg of the soil hardener, 70 ~ 100kg of binder to solidify the soil 1 ㎥.

The method of claim 5,
For 1 m3 of soil,
Basic method using a soil hardener, characterized in that to mix 30 ~ 35 L of the aqueous solution of the soil hardener.

The method of claim 5,
The binder
30 to 40 parts by weight of cement, 50 to 60 parts by weight of slag or fly ash, and 5 to 15 parts by weight of gypsum, the foundation method using a soil hardener.

5. The method of claim 4,
A basic method using the soil hardener, characterized in that by mixing the soil solidifying agent 0.7 ~ 1.5kg, binder 100 ~ 200kg, fly ash or 20 to 25 parts by weight to 1m 3 of the soil.

9. The method of claim 8,
Basic method using a soil hardener, characterized in that the mixture of liquid sodium silicate 60 ~ 90ℓ further solidified.

9. The method of claim 8,
The binder
30 to 40 parts by weight of cement, 50 to 60 parts by weight of slag or fly ash, and 5 to 15 parts by weight of gypsum, the foundation method using a soil hardener.

The method of claim 5,
A basic method using a soil hardener, wherein 1 to 5 L of an emulsion solution in which a methacryl resin and a silica-based hardener are mixed is further added to 1 m 3 of the soil.