KR870000167B1 - Method for grouting with multi-pipes - Google Patents

Abstract

This invention relates to the solidified method of weakened grounds for the purpose of homogenizing and hardening of weakened soil. The object of this method is that the solidifing agent penetrates the all of weakened grounds and hardens them in order to make hard grounds. When the solidifying agent is poured into the grounds, multi-pipes are used so that more than two solidifing agents are poured into grounds. First, one solidifing agent which is solidified within 30 sec. and formed the solidified layer (D) is poured into the grounds, and the other solidifing agent which is solidified beyond a minute is poured into grounds though multipipes and forms the solidified layer(E), and the grounds are hardened.

Description

Compound grout method

1 (a) (b) (c) (d) (e) are diagrams showing the basic principles of the present invention.

2 (a) (b) and 3 show specific examples of the process of the present invention, each using a multi-tube injection tube.

* Explanation of symbols for main parts of the drawings

1, 1 ': appearance 2: inner tube

3, 4, 4 ', 4 ": discharge port 5: switching circle

I, Ia, Ib, II, IIa, IIb, III, IIIa, IIIb, IIIc: Compound A: Multitube

B: Upper discharge outlet C: Lower discharge outlet

D: freezing part of injection material with short freezing time

E: Penetration freezing area of injection material with long freezing time

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of solidifying soft ground, and relates to a ground solidification method that homogeneously and firmly solidifies or indexes soft or leaky ground.

Soft ground is a soft ground that is usually formed by the granulated soil layer and the fine-grained soil layer as an arc layer, in which a high settlement is injected into the ground to homogeneously solidify it. It is necessary.

In recent years, in terms of environmental conservation and water quality conservation, the water glass grouts do not leak out of the injection range, and solidifying at the injection point prevents pollution. It is requested.

There is the following problem as a method of solidifying conventionally known soft ground. That is, in the rod injection method, the main material and the reactant are generally joined at the upper end of the rod and injected therein, but a gap is formed between the boring rod and the ground, and high settlement is ejected from the gap to the ground surface or the ground. Since the injection liquid is separated through this coarse layer, solidification of the fine-grained soil layer and solidification of a predetermined range are difficult. If the gelation time is shortened, gelation is performed in the injection tube.

In addition, the pure grouting method which presses and grinds the purity grout produced by joining in the ground part of the double pipe installed in the ground using the water glass as the liquid A and the gelling reagent as the liquid B. This is being implemented.

According to this, the gelation time is short, so that the grout can be prevented from being blown to the ground part along the periphery of the rod, but the gelation time is short, so the coarse layer can only be solidified into a vein and cannot penetrate between the sites. .

For this reason, a high injection pressure is applied at the time of injection, and therefore, the ground compensation becomes remarkable.

In addition, water excavation is likely to occur during excavation. On the other hand, solution type water glass grout using an ester or the like as a reactant can have a very long gelling time, so that it can be injected homogeneously into the fine-grained soil layer, but the permeability is good, but there are large gaps or granulated soil layers on the ground. Iv) If there is a part, there is a possibility that the injected grout concentrates and escapes to that part and does not penetrate into the fine layer.

In view of such a conventional problem, the present invention is directed to a method in which the injected injection material has a freezing time in a portion close to the ground surface in order to prevent the injection point from being easily separated from the gap around the injection pipe to the surface with less resistance to penetration. After filling with a short injection material and injecting an injection material with a long freezing time into the deep part, the present invention has been focused on penetrating between seto particles without separation.

An object of the present invention is to provide a soft ground freezing method of forming a high-solidified high-strength ground by infiltrating the complex ground all the way to the bottom and integrally integrated as a whole.

In the present invention, in order to achieve the above object in the injection of various injection materials having different freezing time into the ground through the injection pipe,

(A) Using multiple pipes having respective discharge ports with different axial directions as injection pipes,

(B) a few injection materials are respectively injected from discharge ports located at different axial directions of the multi-pipes,

(C) Among the several injection materials having different freezing time, the short freezing time injection material has a freezing time within 30 seconds,

(D) It provides a complex grout method characterized in that the injection material with a long freezing time is injected into the region into which the injection material is injected short.

Explaining the point of the present invention,

(1) Several injection materials with different freezing time are injected into the ground through the injection pipe.

Specific examples of the injection material of the present invention having different freezing time,

(A) Suspension injection material containing cement or clay as an active ingredient

(B) An injection material containing a suspension, such as cement or water glass grout, wherein the whole liquid gels.

(C) Solution waterglass injections containing no suspension.

The freezing time of the injection material with a short freezing time is within 30 seconds, and the freezing time of the injection material with a long freezing time is a freezing time longer than the freezing time of the injection material with a short freezing time.

(2) The multiple pipe which has a discharge port in the part from which the axial direction of the said injection pipe differs is used.

In this case, the multi-pipe refers to a double pipe (consisting of an inner pipe, an outer pipe, and a double structure), or several pipes (flow paths) in parallel.

(3) Various injection materials with different freezing time are injected into the ground through the pipelines in the injection pipes of multiple pipes, respectively.

(4) Injection materials with different freezing time and short freezing time have a freezing time of less than 30 seconds.

(5) In the injection, the injection material with long freezing time penetrates into the area where the injection material with short freezing time is injected. For this purpose, the injection stage is discharged from one discharge port to discharge the injection material with a short freezing time, and the injection material with a long freezing time is discharged from the other discharge port to move the injection stage so that the injection material with a long freezing time is injected into the area where the injection material with the short freezing time is injected. Let's do it.

For example, the injection material with a long fixing time may be discharged from the inner tube tip by interposing the outer tube and the inner tube tip, and the injection material having a short fixing time may be discharged from the discharge port installed about 1m above the distal tip. If the stage is placed up so that the ejection opening of the injection material with a long freezing time is positioned so as to be injected into the area where the injection material is injected with a short freezing time, the injection material with a long freezing time penetrates into the area where the injection material with a short injection time is injected and the freezing time is increased. Long freezing time penetrates into the microlayer or the minute where the short injection material does not penetrate.

Also, by alternately injecting the injection material with a short freezing time and the injection material with a long freezing time, the injection time is injected so that the injection material with a long freezing time penetrates into the area in which the injection material with the short freezing time is injected. Also good.

By using this method, if the injection material with short freezing time is first injected into the ground, it is filled with coarse body of short injection material with high strength and high strength in the gap between the injection pipe and the ground as well as the coarse large bad gap in the ground. Next, when the injection material with a long freezing time is injected into this area, it is already filled and filled into the ground gap or gap as a short freezing time injection material, so the long freezing injection material completely penetrates into the fine grain layer without leaking to the surface or the gap. . After injecting a predetermined amount, the injection tube is pulled up to a suitable height, and the above injection is performed again, and then the injection operation is repeatedly performed several times while pulling up the injection tube. The method can be carried out.

1 is a view illustrating the basic principle of the present invention, where A is a multi-pipe, B is an upper discharge port, C is a lower discharge port, D is a freezing portion of the injection material with a short freezing time, and E is a penetration of the injection material with a long freezing time. It is an integral part.

FIG. 1 (a) shows a state (part of D) in which the injection material having a short freezing time discharged from the upper discharge port B of the multi-pipe A solidifies the perimeter boundary between the injection pipe and the upper part.

FIG. 1 (b) shows a state (part of E) where the injection material with a long freezing time discharged from the lower discharge port C is prevented from leaking to the periphery of the injection pipe and the ground surface and solidified at a desired position.

FIG. 1 (C) shows that the injection material with a short freezing time is injected by raising the stage again, and FIG. 1 (d) shows the injection material with a long freezing time.

As shown in FIG. 1 (e), by injecting an injection material with a long freezing time into a region where an injection material with a short freezing time is injected by moving the injection stage upward as described above, penetrating and infiltrating a portion where the injection material with a short freezing time has not penetrated. Indicates.

In FIG. 2, (I) is an injection material with a short freezing time, (II) is an injection material with a long freezing time, (Ia) (IIa) is a compounding solution containing water glass, and (Ib) (IIb) is a war (1) is the external appearance through which the injection liquid with a short freezing time passes, and (2) shows the inner tube through which the injection liquid with long freezing time passes.

In FIG. 2 (a), the injection material (I) having a short freezing time is obtained as a confluence of (Ia) (Ib), which is injected into the ground from the upper discharge port (4), and the injection material having a long freezing time (II). ) Is obtained as a (IIa) (IIb) confluence, which is injected into the ground from the lower discharge port (3).

FIG. 2 (b) shows an external appearance 1 'having the external appearance 1 doubled therein, and in the pipeline of the external appearance 1, the compound liquid Ia containing water glass is connected to the pipeline 1'. Into the compounding solution 1b containing the reactant, the injection material with a short freezing time is formed by joining the two solutions.

(3) is a discharge port through which the injection material II is discharged through the inner tube 2, (4 ') is a discharge port through which the compounding liquid Ia is discharged and (4 ") is discharged.

The upper glass solution (Ia liquid) is sent from the exterior (1) to the rapid reaction solution aqueous solution (Ib) from the exterior (1 '), and the nutrient solution is mixed outside the discharge ports (4') and 4 "to shorten the solidification time. An injection material is formed and injected into the ground, while a long freezing time injection material II composed of a mixture of water glass and a reactant is discharged from the lower outlet port 3 from the inner tube 2, and the injection stage is upwardly upward. When the transfer is carried out and injected, an injection material with a long freezing time can be injected into a region where the injection material with a short freezing time is injected.

In addition, in the method of the present invention of FIG. 2 (b), an example is shown in which (Ia) liquid from (1) and (Ib) from external appearance (1 ') are mixed outside the injection tube. The injection material may be injected into the ground while mixing inside the injection pipe to form an injection material having a short freezing time in the pipe (not shown).

FIG. 3 shows the freezing time by combining the compounding liquids sent through the pipe of this double pipe using a heavy pipe having switching cocks 5 and 5 respectively in the above-mentioned pipe connected to the outer pipe 1 and the inner pipe 2. The method of switching between this short injection | pouring material and the injection material with long fixing time is shown as an example.

In addition, the switching of FIG. 3 shows only one example, and this invention can use not only this example but any other switching method.

First, the double tube is inserted into the ground, and the aqueous water glass solution III is sent, and at the same time, the aqueous reagent solution IIIa (or IIIc) is sent.

At this time, the formulation of the III liquid (IIIa) liquid is blended so that the solidification time of the confluence liquid is a rapid gelation time within 30 seconds.

As the injection material with short freezing time, after filling the periphery of the injection tube or the coarse bed layer, the confluence of (IIIa) is stopped, and the reaction solution (IIIb) is added to the (III) solution. Inject.

In this case, the mixing of the liquid (III) and the liquid (IIIb) allows the solidification time of the confluence to be longer than that of the confluence of (III) (IIIa).

Thereby, the part which the confluent liquid of (III) (IIIa) liquid did not penetrate can penetrate the confluent liquid of (III) (IIIb) liquid.

In addition, a long solidifying time mixture containing a mixture of water glass and a reactant may be sent to one pipe line, and a short solidification time injection material may be formed by transferring the reactant aqueous solution from the other pipe line to join.

Example 1

combination

If the same amount of solution III and IIIb are combined, the gelation time is 5 minutes. If the same amount of solution III and IIIa are combined, gelation occurs in 2 seconds.

Insert the double tube to a predetermined depth, and inject the Ⅲ liquid into the inner tube by combining the same amounts of Ⅲa liquid into the inner tube. After that, we raise the stage and repeat it again.

Example 2

combination

Ⅲliquid: No.3 water glass mixed with aqueous sulfuric acid solution

[SiO ₂ ]: 7 molarity

PH: 1.0 The gelling time of 15 hours gelling liquid is prepared.

IIIb solution: 10% sodium bicarbonate solution

IIIa liquid: 3. Water glass 20% liquid

First, the solution III was transferred from the inner tube to the solution IIIa. The solution was combined with PH 7.5 and the gelation time was about 2 seconds. The confluence of solution IIIa was stopped and the solution IIIb was added to solution III. Injecting the confluence liquid which represents the above, raise the stage, and repeat the above operation.

Example 3

combination

First, Ⅲ liquid from the inner tube was fed into the inner tube, and the fusion solution containing 5 seconds of gelation time was injected. The confluence of Ⅲa solution was stopped. Inject the liquid and raise the stage to repeat the above operation.

In addition, the injection material containing the water glass shows an example through the outer pipe, but may be through the inner pipe.

The tip of the multi-pipe can be used having a known structure in addition to those shown in the drawings, the present invention is not limited thereto, the discharge port may be in the side wall surface, but may be in the side wall surface and the lower end.

In addition, using an injection tube covered with a metal crown on the exterior or inner tube, the ground may be drilled, but may be drilled as high pressure water. It may also be injected while rotating the inner tube, the outer tube or something.

In addition, the injection material may be injected into the injection material is sent through a plurality of pipes in the multi-pipe conduit in the pipe is discharged, may be injected from the outside of the discharge port in the ground.

In the present invention, the solidification time of less than 30 seconds is particularly important in the case of solution type grout because it forms an effective gel film in the gap between the injection tube and the ground.

Accordingly, when the injection liquid having a long freezing time is injected thereafter, the injection liquid can be prevented from being ejected to the ground portion through the injection tube, and the gel film of the injection liquid discharge port is destroyed so that the injection liquid having a long freezing time is prevented. Can penetrate the soil layer of the stage part.

However, in the conventional rod injection, the compounding liquid having a solidification time of less than 30 seconds may become impossible to be injected due to blockage in the rod when it is joined from the Y-shaped tube at the upper end of the rod. Joining at enables the use of these shorter solidification injections.

If the freezing time of this injection material is more than 1 minute, the injection material is ejected to the ground from around the injection tube, so that the sealing of the gel film can not be made around the injection tube. It is ejected from the surface to the surface and injection at a predetermined depth is impossible.

For this reason, by inject | pouring the injection material within 30 second of solidification time, it is inject | poured into the ground, without deviating even if the injection material is injected more than 1 minute.

In the present invention, as a reaction agent of the water injection material, acids (inorganic acids, organic acids, etc.), salts (inorganic salts, organic salts, basic salts, neutral salts, acid salts, and the like), esters, aldehydes, amides, and the like are shown in the following examples. Arbitrs, alcohols, alkalis, such as lime, arbitrary things can be used.

(Reactant)

Esters:

Fatty acid ester of monohydric alcohols, such as ethyl acetate, methyl acetate, butyl acetate, and amyl acetate.

과 같은 불포화 지방산에스테르, 탄산에틸렌(에틸렌 카아보네이트), 탄산프로필렌(프로필렌카아보네이트), 글리세린카아보네이트 등의 환상 카아보네이트와 같은 카아보네이트류.Intramolecular esters (cyclic esters: lactones) ethylene such as fatty acid esters (polyesters) δ-butylolactone and ε-caprolactone of polyhydric alcohols such as ethylene glycol diacetic acid ester, glycerin triacetic acid ester and succinic acid diester Glycool mono formic acid ester, Ethylene glycol monoacetic acid ester, Ethylene glycol monopropionic acid ester, Glycerine mono formic acid ester, Glycerine monoacetic acid ester, Glycerine monopropionic acid ester, Glycerin dicarboxylic acid 1 ester, Glycerin acetic acid ester, Sorboolool mono formic acid ester Polyhydric alcohol partial esters such as sorbobiol monoacetic acid ester, glycoic acid monoacetic acid ester, low polymerization degree vinyl acetate, etc., diacetoxy ethylene

Carbonates, such as cyclic carbonates, such as unsaturated fatty acid ester, ethylene carbonate (ethylene carbonate), propylene carbonate (propylene carbonate), and glycerol carbonate.

Aldehydes:

Dialdehydes, such as glyoxal, hobasanaldehyde, malondialdehyde, succinaldehyde, glutaraldehyde, and furfuraldialdehyde.

Amides:

Formamide, dimethylformamide, acetami, dedimethylacetamide, propionamide, butylamide, acrylamide, malondiamide, pyrrolidone, caprolactam and the like.

Alcohol:

Monohydric alcohol or synthetic polymer alcohol, such as ethyl alcohol, methyl alcohol, amyl alcohol, glycerin, and polyvinyl alcohol.

Acids:

Inorganic acids such as sulfuric acid, hydrochloric acid and phosphoric acid, organic acids such as formic acid, acetic acid, malonic acid, succinic acid, maleic acid and tartaric acid.

Inorganic salts: (acid salts, neutral salts, basic salts, etc.)

Chlorides such as calcium chloride, sodium chloride, magnesium chloride, potassium chloride, aluminum chloride, sulfates such as calcium sulfate, sodium sulfate, aluminum sulfate aluminate, sodium aluminate, potassium aluminate, hydrochloride such as ammonium chloride, zinc chloride, aluminum chloride Chlorates such as sodium chlorate, potassium sorbate, sodium perchlorate, potassium perchlorate, carbonates such as sodium carbonate, potassium carbonate, ammonium carbonate, sodium bicarbonate, potassium bicarbonate, ammonium bicarbonate, sodium bisulfate, potassium bisulfate, ammonium bisulfate Bisulfite such as sulfate, sodium bisulfite, potassium bisulfite, potassium bisulfite, ammonium bisulfite, silicate salts such as sodium silicate and potassium silicate, alkali metal salts of silicic acid, silicates such as alkaline earth metal salts and aluminum salts, sodium borate Borate salts such as ammonium borate, sodium hydrogen phosphate, potassium hydrogen phosphate, hydrogen phosphate such as ammonium hydrogen phosphate, pyrosulphur Pyrosulfates such as sodium sulphate, potassium pyrosulfate and ammonium pyrosulfate, pyrophosphates such as sodium pyrophosphate, potassium pyrophosphate and ammonium pyrophosphate, bichromates such as sodium dichromate, potassium dichromate and ammonium dichromate, and calcium permanganate and sodium permanganate Such as permanganate.

Ca, Al, Mg salts, such as metal oxides, such as quicklime, alumina, iron oxides, and magnesium oxides, slag, fly ash, calcium silicate, cement, and clay.

Organic salts:

Sodium acetate, sodium succinate, potassium formate, sodium formate and the like.

Suspending reagents are not soluble in themselves, such as oxide slack of aluminum, iron and magnesium such as alumina and magnesium oxide, fly ash, calcium silicate, and Ca, Al and Mg salts of silicic acid such as cement. Although formed, Ca, Al, Fe, etc. of glass react with the silicic acid in water glass.

As the water glass, alkali metal salts of silicic acid having an arbitrary molar ratio including liquid water glass having a molar ratio (SiO ₂ / M ₂ O) of 1.5 to 5.0, anhydrous water glass, hydrated water glass, crystalline water glass, and the like. Or a mixture of an alkali metal salt of silicic acid and silicic acid.

As a mixture containing water glass, a solution containing a reaction glass in water glass other than a water glass solution or a mixed aqueous solution of water glass and a reactant gels itself, and its pH value is alkali, neutral, Any pH such as acid may be used.

As described above, the present invention is characterized in that various injection materials having different gelation times can be used at will, and the method is simple and excellent effect can be obtained.

[Test Construction Example]

The test construction is carried out using the method of the present invention in the bottom-floor dead sand layer with groundwater.

Prepare I and II solutions as follows.

I liquid (confluence of Ia liquid and Ib liquid):

Ia liquid: The compound liquid adjusted to PH1 by adding water glass to sulfuric acid.

Ib solution: Water glass solution

The formulation is set so that the Ia liquid and the Ib liquid are combined to form I liquid and gel in 3 seconds.

Solution II: Adjust the pH to 3 by adding water glass to sulfuric acid, and set the formulation so that the gelation time is 1 hour.

In the method of FIG. 2b, after the I liquid is injected, II liquid is injected to raise the stage. Repeat this operation to continue the injection.

When excavated after injection, I liquid was solidified in the granulated soil layer of the ground, and II liquid was infiltrated and solidified in the fine grain soil layer.

There was no deviation of II liquid.

Claims (1)

In the compound grouting method in which various injection materials having different freezing time are injected into the ground by using multiple pipes having discharge holes at different axial positions, injection material having a short freezing time having a freezing time of less than 30 seconds from the upper discharge port of the multi pipes. And the injection stage of the injection is changed by injecting the injection material having a long freezing time from the lower discharge port, and then moving the multi-pipe upwards to thereby change the injection stage in the injection. Composite grout method characterized in that to inject the injection material with a long solidification time in the injected region.

Images