JPS6012386B2 - Mixing equipment for preparing ground consolidation chemicals - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixing device for preparing a chemical solution for soil consolidation by mixing water glass and an acidic reactant, and in particular, for maintaining the feed value of the resulting consolidation chemical solution in a desired pH range. Relating to a mixing device.

In recent years, in order to consolidate soft ground or stop leaking ground, a consolidation chemical solution is injected into the ground to solidify or stop the water (hereinafter simply referred to as "consolidation").

), the so-called chemical injection method has been widely adopted, but in order to prevent the risk of causing pollution such as soil contamination or water pollution, currently a water glass-based solidified chemical solution (grafting) that does not contain toxic substances is currently used. Only use is permitted. As is already known, water glass-based grafts have been used for quite some time and are very safe grafts, but water glass itself exhibits alkalinity, and the conventional method using it is based on water glass aqueous solutions. Since this method utilizes gelation in the alkaline region, there is a risk that if it flows into water without solidifying, the ground water will become alkaline. It must be carried out under construction management.

However, in the conventional injection method, only the gelation time and strength were taken into consideration, and there was no injection device or injection method that took into account the accurate formulation of the solidifying chemical solution and the accurate adjustment of the pH value.
For this reason, it has conventionally been impossible to manage water quality by controlling the pH value of groundwater.

The purpose of the present invention is to mix water glass and an acidic reactant to maintain a desired pH range, thereby adjusting and injecting grout whose multiplier value is accurately controlled. This method eliminates the drawbacks of the known techniques mentioned above and completely controls the influence of grouting on groundwater.

In order to achieve the above-mentioned object, according to the present invention, a combined water glass container, an acidic reactant supply container, and a water glass and acidic reactant supply container each connected to each of the containers through a pipe line are provided. A mixing container for mixing, a pH detector installed in the mixing container to detect the pH value of the mixed liquid, a supply adjustment device installed in each of the pipelines, each of the supply adjustment devices, and The controller includes a pH detector and a controller connected to each other, and the controller receives a signal from the mother detector and controls the supply so that the pH value of the blended liquid in the mixing device becomes a blend exhibiting a desired pH value. It is characterized in that the adjusting device is activated to supply water glass or an acidic reactant into the mixing vessel, thereby maintaining the pH value of the blended liquid at a desired pH value. As mentioned above, the present invention not only maintains the pH value of grout in a desired range, but also continuously adjusts the injection liquid having a desired pH value.
It is also useful for checking whether the L grout mixture is accurate, that is, for any mixing mistakes.It is also useful for checking what pH value the grout is currently injected into the ground. Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 each shows a specific apparatus of the present invention.

, In Fig. 1, 1 is a mixing container "for mixing a water glass aqueous solution and an acidic reactant.

The water glass is any liquid water glass having a molar ratio of 1.5 to 5.5.

The acidic reactant may be an inorganic acid such as hydrochloric acid, sulfuric acid, phosphoric acid, boric acid, carbonic acid, carbon dioxide gas, or organic acid such as acetic acid, tosuccinic acid, oxalic acid, glycolic acid to adipic acid, oxyacid, etc. ~ In addition, glyoxal, various estertamines, and lactones may also be ethylene carbonate, etc. "Also, inorganic or organic acid salts such as monosodium phosphate, sodium bisulfate, sodium bisulfite, etc. good.

Further, the carbon dioxide gas may be a gaseous gas, a carbonic acid aqueous solution, or dry ice. In the mixing container 1, the water glass aqueous solution and the acidic reactant or its aqueous solution are mixed.

Carbon dioxide gas is blown into the water glass aqueous solution through a pipe, perforated plate, etc. and dissolved in the water glass aqueous solution. The pH value of the liquid mixture thus obtained is detected by a boat detector 3 installed in the mixing container 1. The pH value is read at the end of the day. By reading the pH value,
The pH of the mixed solution can be checked continuously or at all times, so you can also check for mistakes in formulation.If the pH value is lower than the desired value, you only need to add water glass to the mixed solution; For example, by adding only the acidic reactant, it is possible to obtain a grout whose pH is maintained at a desired pH range. By the operation of 7, it is injected into the ground from the injection pipe 8.

If such injection is carried out, the pH of the grout is completely controlled, so the influence of the grout on the pH value of groundwater can be completely controlled. In the present invention, soil consolidation includes normal pressure injection, high pressure injection, mixing underground or above ground, spreading, infiltration, filling into depressions, etc.

Also, this pH detector is always installed in the mixed solution in the mixing container 1 while the injection solution is being mixed, but once the blended solution has been adjusted to the desired pH value, it is installed for washing with water, etc. Of course, it may also be extracted from the blended liquid. Furthermore, the present invention provides a mixing container 1! Kokara ~ water glass offering joint container [A
] and an acidic reactant supply container [B], and water glass and acidic reactant are filled into the mixing container through T pipes a and b, respectively, or are spouted out.

If the carbon dioxide gas is a gas, a carbon dioxide gas cylinder can be used as the supply container [B]. In addition, this pipe is used to supply the water glass or acidic reactant to the mixed liquid in the mixing container.
Of course, the distal end may be positioned so as to have a hole. Furthermore, the present invention automatically controls the pH value to continuously adjust the injection liquid having a predetermined pH value and inject it into the ground.

This will be explained in detail as follows. In addition to the above-mentioned supply containers [A] and [B], the mixing container 1 further includes an on-off valve as a supply adjustment device, an on-off valve b', and a controller 9.

Opening/closing valves a'e and b' are installed in pipes a and b, respectively. The controller 9 controls the on-off valve ar? b' and the pH detector 3, respectively. As the above-mentioned supply adjustment device, a supply pump may be used instead of the on-off valves a' and b', or the on-off valves and the supply pump may be used together.

In any case, by activating the feed conditioning device, e.g.
Water glass or acidic reactant is supplied from the supply containers [A] and [8] to the mixing container 1 by opening and closing the on-off valve or by operating or stopping the combined pump. Although it is installed in both the pipes a and b, it is not necessarily necessary to install it in both, and it may be installed in either one of the pipes a and b.

In the apparatus shown in FIG. 1 constructed in this way, first, the mixing container 1
The pH of the mixed liquid in the tank is continuously measured by the pH detector 3, and the detected value is transmitted to the controller 9 as a signal.

For example, when the controller 9 is set to maintain the bait value area in the neutral area (value range: 5 to 9), if the bait value becomes 5 or less, the relay circuit in the controller 9 works, the on-off valve a' opens, and the water glass is supplied to the container [
A] is automatically fed into the mixing container 1 to increase the feed value, and when the pH value reaches 5 or higher, the on-off valve a'
closes. Also, if the boat value is 9 or more, as mentioned above,
The on-off valve opens and the acidic reactant is automatically fed into the mixing container 1 from the supply device [B] to lower the pH value, and eventually, when the FH value becomes 9 or less, the on-off valve b' is opened. close. In this way, the multiplier value of the liquid mixture can be automatically maintained within the neutral range. The grout obtained by the first illustrated device passes through the discharge port 5 and the supply pipe 6, and is injected into the ground from the injection pipe 8 by the operation of the pump 7.

This grout is also the same as the grout obtained with the first illustrated apparatus, and since the pH value is completely controlled, it does not cause pollution such as groundwater contamination. In addition, when injecting the grout into the ground, the grout is first transferred from the mixing container 1 to a storage tank (not shown) prepared separately, and the grout is flowed from the storage tank into the supply pipe 6, and then pump 7 , injection tube 8
It may also be injected into the ground after

In this way, the grout for subsequent use can be prepared during the injection, and the grout can be poured continuously with a single device without loss of time. Further, in the present invention, two mixing containers 1 may be installed in parallel or one above the other.

In this way, in the same manner as described above, after preparing the grout in one mixing container, switch to the other container, and while grout is injected from the former container, further grout is prepared in the switched latter container, It can be kept ready for the next injection and continuous injection is possible. In addition, in the figure, a water glass supply container [A] is used as the supply V supply container of the present invention.
], only the supply container [B] for the acidic reactant is shown, but it goes without saying that a water supply container, a supply container for an alkaline material, etc. may be further added.

Furthermore, in order to automatically fill the mixing container 1 with a water glass aqueous solution and an acidic reactant or carbon dioxide gas,
For example, an automatic metering layer or an automatic liquid level metering device may be installed in the container.

In this way, the water glass aqueous solution and the acidic reactant are automatically supplied into the mixing container 1, and a predetermined amount is automatically maintained in the mixing container at all times during mixing. For example, if this automatic measuring device is installed in the device shown in FIG. It becomes possible to drive and has extremely high practicality. As described above, according to the present invention, it is possible to prepare a liquid mixture that exhibits an arbitrary multiplication value in an alkaline region, a neutral region, and an acidic region, and use it to consolidate the ground.

Alternatively, an acidic aqueous solution having an arbitrary multiplier value obtained by adding water glass to an acidic aqueous solution can be prepared,
By adding alkali or basic salt to acidic silicic acid aqueous solution, any F
It is also possible to increase the H value or adjust it to a neutral value. As described above, the mixing device of the present invention not only maintains the pH value of the grout within the desired range, but also automatically adjusts the injection liquid that shows the desired multiplication value, and also determines whether the grout composition is accurate. In other words, it is useful for checking for mixing mistakes.
Furthermore, it is a highly practical device that is useful for checking what multiplier value of grout is currently injected into the ground, and the consolidation method using this device can reduce the effect of grout on the multiplier value of groundwater. This method is completely controllable, and is an extremely innovative method not only for improving the accuracy of injection formulation and streamlining the injection process, but also for preventing pollution.

[Brief explanation of the drawing]

Each of FIGS. 1A and 1B shows a specific apparatus of the present invention. 1...Mixing container, 2...Agitator,
3...pH detector, 4...meter, 5...discharge port, 6...supply pipe, 7...pump, 8...
Injection tube, 9... Controller, [A], [B]
...Supply container, a, b...Pipeline, a', b'...
・Opening/closing valve. Many. Z. figure

Claims (1)

[Claims] 1. A water glass supply container, an acidic reactant supply container, a mixing container for mixing the water glass and the acidic reactant, each connected to each of the containers via a pipe line, and installed in the mixing container. The system includes a pH detector that detects the pH value of the mixed liquid, a supply adjustment device installed in each of the pipelines, and a controller connected to each of the supply adjustment devices and the pH detector, and The controller receives the signal from the pH detector and adjusts the pH of the blended liquid in the mixing device.
The supply adjustment device is operated to supply water glass or an acidic reactant into the mixing container so that H has a composition with a desired pH value, and as a result, the pH value of the blended solution is maintained at the desired pH value. A mixing device for adjusting the chemical solution for ground consolidation.