JPS5949280A - Chemical composition for ground impregnation - Google Patents

Abstract

PURPOSE:A chemical composition for ground impregnation for making control and regulation of gel time easy, causing neither change of properties nor denaturation for a long period, obtained by combining an A solution prepared by adding NaCl or KCl or both to water-glass with a B solution containing a gelatinizing agent. CONSTITUTION:(A) An A solution prepared by adding NaCl or KCl or both to specific water-glass, diluting it with water, is combined with (B) a B solution containing a gelatinizing agent (e.g., H3PO4, H2SO4, etc.), and if necessary, MgSO4, MgCl2, etc., to give the desired composition. EFFECT:All required are blending of specific water-glass with a B solution in a plant, and blending of the specific water-glass with water and the B solution on- site, weighing of chemical, feeding, and stirring are not needed, labor is reduced, there is no danger of handling of powerful and poisonous substances, and change in gel time caused by weighing error can be prevented.

Description

[Detailed Description of the Invention] The present invention relates to the injection of chemical solutions for the purpose of strengthening and water-stopping soft ground, especially by mixing IJium or potassium chloride (or potassium chloride in advance) into a water glass stock solution. , which makes it easy to manage and control gel time, and prevents deterioration and denaturation over a long period of time. An object of the present invention is to provide a water glass-based injection drug composition that does not cause any damage.

Chemical injection has become widespread and indispensable as an auxiliary method for construction work, but its drawbacks are that it costs more than other auxiliary methods and requires skill to perform.

The following reasons can be considered for 17.

(1)/1: The cost of materials for injection chemicals used in major construction work is high.

(2) The curing agent used to gel water glass is often a mixture of two or more types, and the material of the curing agent is liquid, powder, or a combination of liquid and powder. It is complex, and in the case of powder, it is often poorly soluble in water, so it is time-consuming and requires skill to prepare on-site. Also, depending on the type of curing agent, water//shirasu reacts extremely sensitively to small mixing fluctuations, so the tolerance range for curing agent formulation is narrow, and as a result, it is extremely difficult to control the gel time of the injected chemical solution. Something.

(3) If the curing agent is commercially available in solid form, it is difficult to improve blending accuracy and save labor by automating the blending operation, and even automation increases equipment costs.

′-! In addition, the biggest drawback of the water gel and glass based chemical solutions according to the prior art is that it is difficult to control and manage the gel time. The main factors that are considered to cause gel time variation A are listed below.

(1) Error in the content of the curing agent contained in the curing agent liquid (liquid B).

(2) Fluctuation in the mixing ratio of liquid A and liquid B.

(3) Effects of differences in the type of curing agent used.

(4) Measurement error of curing agent.

(5) Changes in the discharge amount of the infusion pump over time.

- The effects of errors or fluctuations in (1) to (5) in (h) cannot be avoided in actual chemical injection operations, and the resulting variations in gel time are unavoidable as an unavoidable flaw in the chemical injection method. Currently, this is allowed.

The present invention uses an inexpensive inorganic curing agent, and the gel time can be easily adjusted, and the gel time can be easily controlled without paying particular attention to the compounding operation. The present invention relates to an injectable liquid composition that does not contain any of the following.

The injection drug composition according to this research contains one inorganic curing agent for one part.
However, by blending, it is possible to prepare a medicinal solution composition that has a sufficiently long gel duration, and the gel duration of the medicinal solution can be, for example, about 10 to 30 minutes. However, when higher strength is required, a known organic hardener may be added to the inorganic hardener used in the present invention.

The injectable solution according to the invention is made of inexpensive hydrochloride salts, especially chloride-
1-) Add Ryuno or potassium chloride to the water glass stock solution in advance, and then dilute this with water to gel A solution with B solution containing a gelling agent. , as a gelling agent, H3P0II, Sol, NA, HCO, and (t
Use an aqueous solution or suspension of cement. A mixture of H, PO, and H2SO, or NaHCO! A mixture of l and cement can also be used as a gelling agent.

Solution A used in the present invention is prepared by diluting a commercially available water glass stock solution with water and adding Naα
Or it can be made by adding α. However, preferably, a special water glass is produced by adding the necessary amount of Na (7 or α) to the water glass stock solution, and this is transported to the site by tank truck or the like and diluted with water to make liquid A into rJ-%. 1
draw

The B solution (gelling agent) of the present invention contains Mg5o, α2, N
~So4. It is also possible to add one or more of inorganic salts such as K and SO2, and organic gelling agents such as glyoxal, ethylene carbonate, and glopyrenocarbonate. When such other gelling agents are used together, H
, PO4 or H2SO4 is preferably used in the form of a one-component and highly stable hardening agent liquid for water glass.

When using the one-component hardening agent for water glass according to the present invention,
It is mixed in the factory and provided in a stable, uniform, one-component form, which is transported by tank truck to the injection site, where it is directly poured into the injection chemical mixing tank. I'll send it to you. Therefore, when preparing the injection drug solution, there is no need for workers to adjust the amount of nE or manually add and stir chemicals, etc., which not only reduces labor, but also eliminates the risk of handling highly toxic substances and prevents erroneous operation. It is possible to prevent variations in the quality and gel time of the injected drug solution.

In addition, we have attached a transmission that can adjust the discharge IT to the pump that transports the hardening agent stock solution from the receiver/receiver, the water glass stock solution to be mixed, and the pump that pumps the water. By providing a timer etc., the preparation operation of the injection drug solution can be easily automated, and the gel time can be managed in a reliable and reliable manner. That is, by using the one-component curing agent composition for water glass according to the present invention, the required gel time of the injection drug solution, the temperature and temperature of the injection site can be reduced.
When formulating an injection drug by considering all factors such as the influence of liquid temperature on gel time and the acidity of the injection drug, these complex factors should be quantified in advance, and workers can simply follow instructions. Precise operation can be achieved by simply operating the button or the pulp. / The ability to create the stem can be achieved.

The first feature of the injectable drug solution according to the present invention is that the gel time can be extremely easily and reliably controlled over a wide range from instantaneous setting (3 to 15 seconds) to approximately 5 to 10 minutes.

Even with conventionally known technology, the gel time can be reduced from instant setting to 2~
Although there was a chemical solution that could be adjusted within a range of up to 3 minutes, this type of chemical solution according to the prior art had the drawback of poor reproducibility, and even a slight measurement error could significantly change the gel time.

The present inventor has been conducting various studies with the aim of developing a chemical solution for ground injection that has excellent properties that allow adjustment of gel time over a wide range and that has less variation in gel time due to measurement errors or temperature changes. However, as a result of researching various factors that cause variations in gel time, we have developed a scale (judgment criteria (A) and (b)) that is useful for determining the difficulty level of gel time as described above.

Variation in time (1) When the gel time is relatively short (5 to 10 minutes), the gel time (G, T,) can be expressed by the following formula.

CG, T, 55) Throat! oJI agent j%MG, T, 1
0 minutes (7), σ) rZ agent t@:) (G, T,
Curing agent A at 5 minutes) (11) When the gel time is relatively long (10 minutes to 30 minutes), gel tights (G, T,) are expressed by the following formula.

(G, T, 1 liter of curing agent for 10 minutes) Judgment criteria (b
) : Change in gel time due to difference in mixing ratio of A liquid and B liquid.
) The value obtained by dividing the difference in gel time when the mixing ratio is (1:1) by the gel time when the mixing ratio is (1:1) is a proportional relationship.

The higher the numerical value of the above criterion (a), the easier it is to manage the gel time. The closer the value of the above criterion (b) is to 1, the easier it is to manage the gel time.

Based on the decision criteria described above, we investigated the difficulty level of gel time management for various injection drug formulations and found that water glass stock solution plus salt, special KNaC7! The present invention has been completed based on the discovery that by mixing a small amount of α, α, or both of these, a drug solution with extremely easy gel time management can be obtained.

EXAMPLES The present invention will be explained in more detail with reference to Examples below. Naα, KCl, Na used in Examples
, CO, , Na2S04 and NaHCO.

is a grade 1 reagent, Portland cement is an ordinary commercially available product, phosphoric acid is 98%, and sulfuric acid is 75% industrial grade.

Mix No. 3 water glass and water in a volume ratio of 4 to 1 and mix 1° water glass-2 at room temperature with K (7440 and F dissolved in water to make 200 t,
Using a pump with a discharge ratio of 1:4, 800 tons of No. 3 water glass stock solution prepared separately was mixed in proportion to 4 L using a special conduit mixer in the mixing section to obtain water glass-1.

Water glass-3 was prepared in the same manner as above except that 40 kg of Na2Co was used.

Water glass-4 Water glass-4 was prepared in the same manner as above except that Na2So440Kf was used.

Water glass-5 was prepared in the same manner as above except that NILα40Ky was used.

Preparation of hardener liquid Hardening agent-A 25% phosphoric acid was used diluted with water.

Hardening agent-B 75% sulfuric acid 145t and magnesila sulfate J・200 Kp
was mixed with 800 tons of water to make the total amount 1000J.

Hardening agent-C Sodium bicarbonate was dissolved in water.

Preparation of injection drug composition 50 t of each of the above water glass solutions was diluted with 50 t of water to prepare a solution A. Separately, a predetermined amount of each of the above curing agent liquids was diluted with water to obtain liquid B. Equal amounts of liquid A and liquid B were mixed to prepare a drug solution for injection. At this time, variations in the gel time of the injected chemical solution when the predetermined amounts of each curing agent used in Solution B were changed were investigated and plotted in a graph.

In the graphs in Figures 1 to 3, which show changes in Gel Tights with respect to changes in the amount of hardening agent added, the horizontal axis shows the hardening agent concentration (inverted scale), and the vertical axis shows the measured gel time on a logarithmic scale. It is.

As is clear from the attached drawings, when α or Naα is added in advance, compared to the case without addition,
The line indicating the change in gel time has shifted to the right, and #4 has become more negative. This means that the horizontal axis is on an inverted scale (that is, it moves to the right.
Considering that the number of mixing needles of the hardening agent decreases), the difference between gelatin and the hardening agent mixed in m,
means that it is more insensitive to fluctuations in im.

A similar trend is observed with Boltlad cement as a hardening agent.
It was also observed when tl 17-1.

As described above, since the variation in the gel tights is insensitive to the variation in the amount of curing agent mixed in, the injection chemical solution according to the present invention has a wide tolerance range for formulation errors in the field. In order to show the effect more clearly, when a phosphoric acid aqueous solution is used as a hardening agent, the mixing ratio of liquid A: liquid B is 90:1.
(Figure 4 shows an example of the case where the ratio is varied in the range of 1 to 100:90. While the gel time changes greatly with changes in the ratio, in the case of the water glass used in the present invention (Water Glass-2), the change in gel time due to changes in the mixing ratio is small and the gel swim is It turns out that it is easy to manage.

Fourth, based on the graphs shown in FA1 to FIG. 4, the calculated values of the judgment criteria (a) and (b) described in 2 are calculated and summarized in the table below.

As is clear from the above table, adding salts to the water glass in advance has the effect of making it easier to manage the gel time. This effect is KC! ! In the case of containing (water glass-2)! This is noticeable in samurai. Add N to the water glass in advance.
When aα was included, the same effect as in the case of KCI was observed.

[Brief explanation of the drawing]

Figures 1 to 3 show changes in gel time corresponding to changes in curing agent addition when a water glass liquid in which salts have been added to the water glass stock solution in advance and a hardening agent liquid are combined. Figure 1 shows the case where phosphoric acid is used as the hardening agent, Figure 2 shows the case where a one-component hardening agent consisting of sulfuric acid and magnesium sulfate is used as the hardening agent, and Figure 3 shows the case where the hardening agent is used as the hardening agent. The case where a sodium bicarbonate solution is used as the solution is shown. FIG. 4 is a chart showing that the variation in the blending ratio of liquid A: liquid B has no effect on the gel time of the injectable liquid obtained by mixing AB painting liquid. 16′;

Claims (4)

[Claims] (1) Add N a (l or Kct or No.
A chemical composition for ground injection, characterized by combining a liquid A obtained by adding both α and KCJ in advance and a liquid B containing a gelling agent. (2) As described in claim (1), the gelling agent is phosphoric acid, sulfuric acid, a mixture of phosphoric acid and sulfuric acid, sodium bicarbonate, cement, or a mixture of sodium bicarbonate and cement. chemical composition for ground injection. (3) Using a gelling agent (7), use an aqueous solution of phosphoric acid or sulfuric acid, or a mixed aqueous solution of phosphoric acid and sulfuric acid, and add magnesium sulfate, magnesium chloride/rum chloride, sodium sulfate, potassium sulfate, gliogyder, and ethyl chloride to this aqueous solution. /carbonate and propylene carbonate
The chemical liquid composition for ground injection according to claim 1, characterized in that one or more species are added. (4) Percentage of Claims A method for producing a chemical composition for ground injection according to claim (1), characterized by mixing a water glass stock solution, water, and NaCt or α at room temperature. how to.