JPH04159390A - Equipment for mixing grout for ground - Google Patents

Abstract

PURPOSE:To realize the automatic mixing of a liquid A and a liquid B to thereby realize the continuous feeding thereof by supplying a liquid B metered in a liquid B storage tank to a liquid A mixing tank where it is mixed with an aqueous sodium silicate solution to prepare a liquid A. CONSTITUTION:A prescribed amount of water is supplied through a supply pipe 7 to a liquid B mixing tank 40 and an electrode 42 is operated and stopped. An agitator 41 is operated and a water-soluble inorganic acid (acidic salt) or organic acid is charged to the tank 40 and mixed to give a liquid B. Upon receipt of a signal from a liquid B storage tank 5, the agitator 41 is stopped, and the liquid B is fed into a reservoir 50 of the tank 5. Part of the liquid B is injected through a withdrawal pipe 53, and part of it is fed into a metering tank 80 by a pump 81. Upon receipt of a signal from a liquid A mixing tank 2, the pump 81 is stopped, and the liquid B in the tank 80 is supplied through a supply pipe 83 to the tank 2, where it is mixed with an aqueous sodium silicate solution supplied through a supply pipe 6 to prepare a liquid A. The liquid A is then fed into a liquid A storage tank 3 and injected through a withdrawal pipe 33.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention strengthens and stabilizes soil by injecting into soil a water glass grout agent obtained by mixing liquids A and B. The present invention relates to a device for preparing liquid A and liquid B in a soil stabilization method.

(Conventional technology) Generally, in order to strengthen the soil quality or to stop water from leaking ground, a water glass-based grout agent is injected into the soil to gel the water glass, thereby strengthening and stabilizing the soil quality. There are known methods to do this. In addition, in this method, the gelation time of the water glass grouting agent can be arbitrarily adjusted over a wide time range from several seconds to several tens of minutes, and the As a method that has very little effect on gelation time and can therefore reliably perform the intended soil strengthening or water stoppage, there is a soil stabilization method, for example, as seen in Japanese Patent Application Laid-Open No. 61-215685. It has been known. That is, this construction method uses PH1, which is made of sodium silicate and a hardening agent.
An aqueous solution of 1 or more (liquid A) and an aqueous solution of a curing agent (liquid B) are mixed and injected into soil.

(Problem to be solved by the invention) By the way, the A used in implementing this construction method
The liquid is made by mixing sodium silicate and a hardening agent, and has a pH of 1.
By setting the number to 1 or more, the formulation is prepared in a state that does not gel. However, since the liquid contains a curing agent that promotes the gelation of sodium silicate, if the sodium silicate and curing agent are mixed in a hurry, both components will not be sufficiently diffused, resulting in gelation. Even if the mixing ratio is such that gelation does not occur, partial gelation occurs and a stable solution A cannot be obtained. Therefore, when it is attempted to prepare such liquid A on-site, the work becomes troublesome.

Furthermore, if the amounts of liquids A and B to be used are not known in advance, the liquid preparation work and the liquid injection work must be repeated intermittently, resulting in the inconvenience of reduced work efficiency.

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a mixing device for chemical liquids for ground injection that can automatically mix and continuously supply liquids A and B in the above-mentioned construction method. It is said that

(Means for Solving the Problems) The device for preparing a chemical solution for ground injection of the present invention comprises at least one selected from the group consisting of (a) sodium silicate, (b) a water-soluble inorganic acid, an organic acid, and an inorganic acid salt. Soil stabilization by injecting into the soil a water glass grouting agent obtained by mixing liquid A containing the above-mentioned (al component and (1)) component and liquid B containing the above-mentioned ('b) component. In chemical construction methods,
A device for mixing liquids A and B, comprising a liquid A mixing tank configured to mix liquid A, a liquid A storage tank connected to the liquid A mixing tank, and a liquid B tank configured to mix liquid B. a B liquid mixing tank, and a B liquid storage tank connected to the B liquid mixing tank;
The A liquid storage tank and the B liquid storage tank are each provided with a liquid storage means for managing the amount of stored liquid so that it does not fall below a certain level. The liquid used from the storage tank is supplemented from the A liquid mixing tank and the B liquid mixing tank, and the B liquid storage tank is provided with a measuring device for measuring a fixed volume of B liquid, and this measured B liquid is supplied to the B liquid mixing tank. The liquid is supplied into an aqueous sodium silicate solution formed in a liquid A mixing tank, and liquid A is prepared.

The above sodium silicate component (a) is usually J
No. 3 sodium silicate specified in IS K 140B is preferably used, but sodium silicate No. 1, sodium silicate No. 2, or sodium silicate equivalent to No. 3.5 can also be used.

The water-soluble inorganic acids, organic acids, and inorganic acid salts of component (b) are not particularly limited as long as they are water-soluble, but examples of inorganic acids include sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, boric acid, Examples of organic acids include acetic acid, oxalic acid, formic acid, propionic acid, butyric acid, valeric acid, acrylic acid, malonic acid, succinic acid, glutamic acid, adipic acid, glycolic acid, tartaric acid, citric acid, malic acid, etc. In addition, as inorganic acid salts, sodium dihydrogen borate, sodium hydrogen carbonate, disodium hydrogen phosphate, sodium dihydrogen phosphate, sodium hydrogen sulfate, potassium hydrogen carbonate, dipotassium hydrogen phosphate, potassium dihydrogen phosphate Representative examples thereof include acid salts of alkali metals such as , potassium hydrogen sulfate, and the like.

(Function) In the B liquid preparation tank, the preparation of the B liquid and the supply to the B liquid storage tank are repeatedly performed. In the B liquid storage tank, the B liquid reduced by use is replenished from the B liquid mixing tank.

At this time, the liquid storage means manages the amount of liquid stored in the liquid B storage tank so that it does not fall below a certain amount, so that liquid B can be used continuously. In addition, a certain volume of B in the B liquid storage tank
The liquid is metered by a metering device. In the A liquid mixing tank, first, a sodium silicate aqueous solution is prepared, and a certain volume of B liquid measured by the measuring device is supplied into this sodium silicate aqueous solution, and the A liquid is automatically prepared. . Then, in the liquid A mixing tank, the mixing of the liquid A and the liquid A are performed.
The supply to the liquid storage tank is repeated. In the A liquid storage tank,
Replenish the amount of A liquid that has been reduced due to use from the A liquid mixing tank. At this time, the liquid storage means manages the amount of liquid stored in the liquid A storage tank so that it does not fall below a certain amount, so liquid A can be used continuously.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows the overall configuration of a mixing bag W (hereinafter simply referred to as a mixing device) 1 for a chemical liquid for ground injection.

That is, this mixing bag f1 is a soil stabilization method in which a water glass grouting agent obtained by mixing liquid A containing sodium silicate and a hardening agent and liquid B containing a hardening agent is injected into soil. In the method, a device for mixing liquid A and liquid B includes a liquid A mixing tank 2 configured to mix liquid A, a liquid A storage tank 3 connected to the liquid A mixing tank, and a liquid B A liquid B mixing tank 4 configured to mix liquid;
It is equipped with a B liquid storage tank 5 connected to the B liquid mixing tank and a control device 110 for controlling these, and is capable of automatically preparing and continuously supplying A liquid and B liquid.

The A liquid mixing tank 2 includes a liquid tank 20 for mixing a liquid, a stirring device 21 for stirring the inside of the liquid tank 20, and an electrode 22 for detecting the amount of sodium silicate supplied to the liquid tank 20. is set up and configured.

Stirring device! 21 is a propeller 212 connected to a motor 211 that rotates within the liquid tank 20.
It is designed to stir within 0. Further, the liquid tank 20 is formed into a cylindrical shape with a bottom.

Therefore, by stirring by the stirring device 21, the liquid tank 2
The raw materials supplied into the tank are efficiently stirred and mixed without stagnation.

A sodium silicate supply pipe 6, a water supply pipe 7, and a B liquid supply pipe 83 are connected to this liquid tank 20. Among these, the supply port (not shown) of the B liquid supply pipe 83 is a shower-shaped supply port consisting of a plurality of small holes so as to spray out the B liquid in a diffused state. In addition, the liquid tank 20
A valve 23 is provided at the bottom of the tank 2, and the A liquid is supplied to the A liquid storage tank 3 via the valve 23.

The A liquid storage tank 3 includes a storage tank 30 for storing liquid, a stirring device 31 for stirring the inside of the storage tank 30, and a stirring device 31 for stirring the inside of the storage tank 30.
An electrode 32 for detecting the amount of stored liquid is provided. The stirring device 31 is configured to stir the inside of the storage tank 30 by rotating a propeller 312 connected to a motor 311 inside the storage tank 30 . This allows the liquid in the storage tank 30 to maintain a homogeneous state without stagnation.

This storage tank 30 has a valve 2 of the A liquid mixing tank 2.
A supply pipe with 3 is in communication. In addition, the storage tank 30
A lead-out pipe 33 is provided at the bottom of the tank, and the liquid A is injected from the lead-out pipe 33 via a liquid A injection pump (not shown).

In the B liquid mixing tank 4, a stirring device 41 for stirring the inside of the liquid tank 40 and an electrode 42 for detecting the amount of water supplied to the liquid tank 40 are provided in a liquid tank 4° for mixing liquids. It is constructed according to the following. The stirring device 41 is configured to stir the inside of the liquid tank 4o by rotating a propeller 412 connected to a motor 411 inside the liquid tank 40. Further, the liquid tank 4o is formed into a cylindrical shape with a bottom. Therefore, by stirring by the stirring device 41, the raw materials supplied into the liquid tank 4o are efficiently stirred and mixed without stagnation.

A curing agent supply device 9 and a water supply pipe 7 are connected to this liquid tank 40 . Further, a valve 43 is provided at the bottom of the liquid tank 40, and via this valve 43,
The B liquid is supplied to the B liquid storage tank 5.

The supply bag w9 is composed of a chime and a pilot lamp 91 that notify when the curing agent is added, and an injection completion button 92 that is pressed when the curing side injection is completed. That is, the curing agent is introduced by a chime and a pilot lamp 91, and by pressing the injection completion button 92 after the addition of the curing agent is completed, the compounding device 1 itself is operated to proceed to the next step. However, in this case, the curing agent is added manually, but it is also possible to automate all of this by providing a means for measuring the curing agent.

The B liquid storage tank 5 includes a storage tank 50 for storing liquid, a stirring device 51 for stirring the inside of the storage tank 50, and a stirring device 51 for stirring the inside of the storage tank 50.
An electrode 52 for detecting the amount of stored liquid is provided. The stirring device 51 is configured to stir the inside of the storage tank 50 by rotating a propeller 512 connected to a motor 511 inside the storage tank 50 . Thereby, the liquid in the storage tank 50 is kept in a homogeneous state without stagnation.

This storage tank 50 has a valve 4 of the B liquid mixing tank 4.
A supply pipe with 3 is in communication. In addition, the storage tank 50
A lead-out pipe 53 is provided at the bottom of the tank, and the B-liquid is injected from the lead-out pipe 53 via a B-liquid injection pump (not shown).

The storage tank 50 also includes a measuring tank 80 with a constant volume.
is located adjacent to it. Liquid B is supplied to this measuring tank 80 from a pump 81 provided in the storage tank 50.
It overflows the measuring tank 80 and returns to the storage tank 50 again.

Then, in this overflow state, a certain amount of liquid B is measured into the measuring tank 80. The measuring tank 80 also includes an electrode 82 for detecting the water level of liquid B.
and B supplying the B liquid in the measuring tank 80 to the A liquid mixing tank 2.
A liquid supply pipe 83 is provided to constitute the metering device 8. That is, the electrode 82 first stops supplying the B liquid from the pump 81 while the B liquid is measured in the measuring tank 80 .

Then, the B liquid in the measuring tank 80 is pumped out from the B liquid supply pipe 83, and when a certain amount has been pumped out, the pumping from the B liquid supply pipe 83 is controlled to be stopped.

At this time, as shown in FIG. 2, by reducing the cross-sectional area of the lower part of the metering tank 80 and reducing the amount of capacity fluctuation due to water level fluctuations, a small amount of capacity adjustment can be performed.

Note that the blending device 1 as described above is provided with a level (not shown) because a large number of electrodes for detecting the water level are used. That is, by setting the blending device 1 in a horizontal state in advance using this level, errors due to water level fluctuations are prevented from occurring.

Next, the control by the control device 10 of the blending device 1 as described above will be explained based on FIG. 3.

First, in the B liquid mixing tank 4, water is supplied from the water supply pipe 7 into the liquid tank 40 (step 1).
It is controlled by the electrode 42, and when the predetermined amount is reached, the electrode 4
2 is activated, and the supply of water from the supply pipe 7 is stopped (step 2). Next, stirring by the stirring device 41 is started (step 3), and the chime and biloft lamp 9
1 instructs to input the curing agent (step 4).

Then, a predetermined amount of hardening agent was added & (Step 5).
Press the input completion button 92 (step 6). Then, the instructions by the chime and biloft lamp 91 are stopped. Thereafter, stirring by the stirring device 41 is continued, water and curing agent are sufficiently mixed, and the preparation of liquid B is completed (
Step 7). Then, while stirring the B liquid in the liquid tank 40, it waits for a signal from the B liquid storage tank 5 (step 8), and when the signal from the B liquid storage tank 5 is received, the stirring device 41 starts stirring. Stop step 9), liquid tank 4
All of the B liquid in 0 is supplied to the B liquid storage tank 5 (step 1
0), then the operations from step 1 onwards are repeated.

In the B liquid storage tank 5, the B liquid supplied through the valve 43 is stored in the storage tank 50 (step 11).The storage of this B liquid is managed by the electrode 52, and when a predetermined amount is reached, the B liquid is stored. The electrode 52 is activated to instruct the supply of B liquid from the B liquid preparation tank 4 (step 12). This instruction is issued when the amount of liquid in the storage tank 50 has decreased to the extent that all of the B liquid in the B liquid preparation tank 4 can be put in at once. However, since liquid B is continuously used in the storage tank 50, if this instruction is issued when the amount of liquid in the storage tank 50 has decreased too much, the liquid B used for the injection operation will run out. It happens. Therefore, this instruction is issued after a certain amount of liquid B remains in the storage tank 50. In addition, storage tank 5
Since the B liquid in 0 has been continuously stirred by the stirring device 51 since the end of storage of the first B liquid after the start of the device operation,
The B liquid in the storage tank 50 is managed to be in a homogeneous state. Then, a liquid B injection pump (not shown) is connected to the outlet pipe 53.
Injection of liquid B is carried out via (step 13).

Further, a part of the B liquid is supplied to the measuring tank 80 by the pump 81 (step 14), and the state of overflowing from the measuring tank 80 continues, and the homogeneous state of the liquid is maintained.

Then, while maintaining the B liquid in the measuring tank 80 in a homogeneous state,
Waiting for a signal from the A liquid preparation tank 2 (step 15),
When the signal from the A liquid mixing tank 2 is received, the pump 81 is stopped (Step 16), and the B liquid in the measuring tank 80 is supplied to the A liquid mixing tank 2 via the B liquid supply pipe 83. (Step 17). Then, the B liquid in the measuring tank 80 drops to a certain level, that is, - a fixed amount of the B liquid is lowered to a certain level.
When the liquid is supplied to the liquid mixing tank 2, the electrode 82 is activated and the supply from the liquid B supply pipe 83 is stopped (step 18). Sodium silicate is supplied from the sodium silicate supply pipe 6 (step 19).The supply amount of sodium silicate is controlled by the electrode 22, and when a predetermined amount is reached, the electrode 22 is activated, and the sodium silicate is supplied from the sodium silicate supply pipe 6. The supply of sodium silicate from the supply pipe 6 is stopped (step 20). Next, stirring by the stirring device 21 is started (step 21), supply of the B liquid is instructed (step 22), and the B liquid supply pipe is inserted into the sodium silicate aqueous solution thus supplied. B liquid from 83 is supplied, which makes sodium silicate and B
The mixture is sufficiently mixed with the liquid A, and the preparation of liquid A is completed (step 23).Then, while the liquid A in the liquid tank 20 is being stirred, a signal from the liquid A storage tank 3 is waited for (step 24).
), and upon receiving the signal from the liquid A storage tank 3, the stirring by the stirring device 21 is stopped (Step 25), the liquid tank 2
All A liquid in 0 is supplied to A liquid storage tank 3 (step 2
6) After that, the operations from step 19 onwards are repeated.

In the liquid A storage tank 3, liquid A supplied through the valve 33 is stored in the storage tank 30 (step 27). This A
Storage of the liquid is managed by the electrode 32, and when a predetermined amount is reached, the electrode 32 is activated to instruct the supply of the liquid A from the liquid A mixing tank 2 (step 28). This instruction is issued when the amount of liquid in the storage tank 30 has decreased to the extent that all of the A liquid in the A liquid mixing tank 2 can be put in at once. however,
Since the A liquid is continuously used in the storage tank 30, if this instruction is issued when the amount of liquid in the storage tank 30 has decreased too much, the A liquid used for the injection operation may run out. Become. Therefore, this instruction is issued after ensuring a certain amount of liquid A remains in the storage tank 30. In addition, the storage tank 30
The A liquid in the storage tank 30 has been continuously stirred by the stirring device 31 since the end of storage of the first A liquid after the device operation started, so that the A liquid in the storage tank 30 is managed to be in a homogeneous state.

Then, liquid A is injected from the outlet pipe 33 via a liquid A injection pump (not shown) (step 29).

Next, a specific example of using the blending device 1 as described above will be described.

〔Concrete example〕

As a compounding device, there are a liquid A mixing tank 2004' (mixing allowance), an A liquid storage tank 400jt (liquid storage allowance), a B liquid mixing tank 320/ (mixing allowance), and a B liquid storage tank 640Il (liquid storage allowance). I used something. And, A of this compounding device
In a liquid preparation tank and a liquid B preparation tank, liquids A and B, which are of the so-called water glass solution type instant setting type and have the components shown in Table 1, were prepared.

Table 1 In the B liquid preparation tank, when the curing agent was added to tap water at about 20°C and stirred, a completely dissolved B liquid could be obtained after about 5 minutes.

In addition, in the A-liquid mixing tank, while stirring the No. 3 sodium silicate, a predetermined amount of B-liquid is added at 407% per minute. When the solution was added over a period of 3 minutes at a speed of 1, no gel-like substance was observed and a clear aqueous solution, Solution A, could be obtained.

In other words, in the B liquid preparation tank, 3201 parts of B liquid can be prepared in a cycle of about 8 minutes, including the time for supplying tap water, so in one hour 320 x 60/8 = 240 (1 (
Among them, B liquid injection bone 15001, A liquid formulation 90 (1) B
This means that the liquid can be used in the B liquid storage tank.

In addition, in the A liquid mixing tank, 2001 liquid A can be prepared in a cycle of about 6 minutes, including the supply time of No. Since it is supplied in cycles, calculating with an 8 minute mixing cycle, 200 x 60/8 = 1500 f (
This means that the A liquid of the A liquid injected bone can be used in the A liquid storage tank.

(1) Working ability of the blending device A double-pipe Rondo injection device was connected to each outlet pipe of the liquid A storage tank and the liquid B storage tank of the above-mentioned mixing device via an injection pump, and injection work was performed.

In addition, the working capacity of this double tube Rondo injection device for 1 cent is 5 to 101/min (300 to 6001/hour) for liquid A,
B liquid is 5-101/min (300-600127 hours),
Since this was used for 2 cents, the amount of liquid A and liquid B prepared per hour was 600 to 1200/hour, respectively.

As a result, since the blending device had a processing capacity that exceeded the amount of liquid required for the work, it was possible to perform the injection work continuously without interrupting the work.

In addition, by using this device, liquid B for preparing liquid A,
There is no need to manually measure each time, there is little measurement error, and the stirring and feeding speed of liquid B are controlled by the program when mixing liquid A, so it can be done manually based on conventional intuition and experience. It was possible to always prepare a homogeneous, transparent, and gel-free drug solution without any trouble. Furthermore, by using bicarbonate, which is highly safe, as a curing agent, and there was no water glass-based solution-type instant-setting chemical solution, by using this device to prepare the chemical as shown in Table 1, only sodium bicarbonate can be used. It is now possible to mix and match the social demand for low-cost grouting agents.

(2) Performance test of liquids A and B Using liquids A and B, which are so-called water glass solution type instant setting type liquids prepared by the above-mentioned compounding device, the gel time, -axial compressive strength, and stability of liquid A were tested. Performance tests were conducted on each.

Gel time: 1:1 of solution A and solution B adjusted to 20°C.
When the mixture was mixed at a ratio of 1 (volume ratio) and the time until it stopped flowing was measured, the gel time was 5 seconds.

Unconfined compressive strength: 1 = liquid A and liquid B adjusted to 20°C
1 (volume ratio), and quickly poured into a mold with a diameter of 5 as and length Local until gelatinized, and after curing for 60 minutes, molding was performed and the uniaxial pressure line strength was measured. The strength of the homogel was 0. It was 6 kg/-.

Stability of Solution A: Solution A 500- was placed in a beaker, sealed, and tested for stability at 30°C. It was found to be stable with no increase in viscosity even after 3 days or more.

From the above results, it was confirmed that the A liquid and the B liquid prepared by this compounding device had sufficient performance as a so-called water glass solution type instant setting type ground stabilizing chemical liquid.

(Effects of the Invention) As described above, according to the present invention, liquids A and B can be automatically mixed and continuously supplied, so that liquids containing sodium silicate and a curing agent with a pH of 11 or more can be used. A soil stabilization method in which a certain aqueous solution (liquid A) and an aqueous solution of a curing agent (liquid B) are mixed and injected into the soil can be effectively performed.

[Brief explanation of drawings]

FIGS. 1 to 3 are drawings according to the present invention, and FIGS.
2 is a system configuration diagram showing an outline of the overall configuration of a mixing device for chemical liquid for ground injection, FIG. 2 is a vertical cross-sectional view showing an example of a measuring tank, and FIG. 3 is a flowchart showing the operation of the mixing device. 1... Mixing device for ground injection chemical solution 10... Control device 2... Liquid A mixing tank 3... Liquid A storage tank 32... Electrode (liquid storage means) 4... Liquid mixing tank B 5... B liquid storage tank 52... Electrode (liquid storage means) 8... Measuring device patent applicant Representative of Sekisui Chemical Co., Ltd. Hiroshi 1) Kaoru Figure 2 Figure 3 (a)

Claims (1)

[Scope of Claims] 1) Contains at least one component (a) and (b) selected from the group consisting of (a) sodium silicate (b) water-soluble inorganic acids, organic acids, and inorganic acid salts. In a soil stabilization method in which a water glass grouting agent obtained by mixing Solution A and Solution B containing the above component (b) is injected into the soil, The apparatus comprises: a liquid A mixing tank configured to mix liquid A; a liquid A storage tank connected to the liquid A mixing tank; a liquid B mixing tank configured to mix liquid B; It is equipped with a B liquid storage tank connected to the B liquid mixing tank and a control device to control these, and the A liquid storage tank and the B liquid storage tank have liquid storage tanks that are managed so that the amount of stored liquid does not fall below a certain level. Means are provided respectively, and the liquid used from these A liquid storage tank and B liquid storage tank is A.
The liquid is replenished from the liquid mixing tank and the liquid B mixing tank, and the liquid B storage tank is equipped with a measuring device that measures a certain volume of liquid B, and the measured liquid B is supplied to the liquid mixing tank A. A is fed into the aqueous sodium silicate solution formed.
A device for preparing a chemical liquid for ground injection, characterized in that the liquid is mixed.