JPS5910609A - Control of injection work - Google Patents

Abstract

PURPOSE:To raise the controllability of the quality of grout injection work as well as the control work of the grout injection into the ground by a method in which control is made on the injection work by displaying concurrently the pH value and/or density of grout and the injection pressure and the flow rate of the grout. CONSTITUTION:In solidifying the ground by injecting a grout (e.g., water glassbased grout) into the ground, the injection pressure P and flow rate Q of the grout are displayed correspondingly to the injection times T of the grout. A coefficient representing the chemical characteristic of the grout (e.g., pH value and component concentration of grout, such as density D) is displayed. Control is made by displaying concurrently pH values and/or density D and injection pressure P and flow rate Q. Control on the injection work into the ground and also on the quality of the injection work can therefore be raised.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection management method for injecting a grout into the ground and managing the injection when solidifying the ground.

In recent years, there has been a demand for the development of safe ground injection methods from the perspective of pollution prevention. Among the conventional injection methods, there are the 1 and 5 shot method and the 2.0 shot method, which inject injection liquid with a short gelation time. Now, a main agent aqueous solution (hereinafter referred to as liquid A) and a hardening agent aqueous solution (hereinafter referred to as liquid B), both of which have been adjusted to a predetermined concentration by measuring with a container or by weight, are individually pumped at a fixed ratio using two grout pumps. In the 1.5 shot method, the mixture is mixed in a Y-shaped pipe and immediately injected into the ground through the injection pipe, and in the 2.0 shot method, the injection pipe configured as a double pipe is used. The liquid is injected into the ground and mixed9, and the management of the injection liquid is as follows:
The only thing that was done was to measure and record the concentrations of liquids A and 3 in the container using a hydrometer or the like at time intervals appropriately determined by the construction manager.

In addition, in the 1,0 shot method, which is used to inject injection solutions that have a long gelation time, solutions A and B, which have been adjusted to a predetermined concentration in advance, are mixed at a predetermined volume ratio, and this mixed solution is inserted into the injection tube. However, measurements to confirm the concentration of the injected solution are not always carried out, and regular inspections by the construction manager or initial mixing after newly adjusting AM and B solutions are carried out. It was not carried out except when it was minimally necessary.

Therefore, since the conventional data regarding the quality of injectable liquid is data with large time intervals, the concentration of the injectable liquid during that time is not known, and if there is an error in the mixing operation,
There was no way to identify this, and it was undeniable that the accuracy was lower than other management data.

In addition, a method is used to measure the injection pressure P and the injection amount Q per unit time of the injection liquid, and to control the construction quality from the temporal change characteristics (hereinafter referred to as Tp Q curve). In this method, it is possible to understand whether the injection pressure and the injection volume per minute are normal or abnormal by analyzing the pressure flow curve corresponding to the injection time, but even if it is found to be abnormal, it is difficult to understand the cause. there were.

In other words, if the pressure or flow rate is abnormal, it is often the case that the injection fluid is injected in a state different from the specified injection fluid, or that the injection fluid is unsuitable for the injection ground conditions. many.

The object of the present invention is to eliminate the disadvantages present in the above-mentioned known technology,
An object of the present invention is to provide a press-in management method for controlling injection by monitoring the injection so that the injection liquid is reliably solidified in the ground.

In order to achieve the above-mentioned object, according to the present invention, when injecting an injection liquid into the ground and solidifying the ground, the injection pressure and flow rate of the injection liquid are adjusted in accordance with the injection time of the injection liquid. In addition to displaying the injection pressure and flow rate, a coefficient representing the chemical characteristics of the injection liquid and/or a coefficient representing the concentration of a compounded component of the injection liquid is displayed. The present invention is characterized in that injection is managed by displaying the injection pressure and flow rate at the same time as the injection pressure and flow rate.

Hereinafter, the present invention will be specifically explained in detail.

As described above, the present invention is characterized in that in addition to the injection pressure and flow rate of the injection liquid, the injection is managed by simultaneously displaying a coefficient representing the chemical characteristics and/or a coefficient representing the concentration of the compounded components.

Examples of coefficients representing chemical characteristics of the injection liquid include PH value, or electrical values such as electrical conductivity and specific resistance. Further, as coefficients representing the concentration of compounded components, measured values such as density, viscosity, electrical conductivity (or specific resistance), sound waves (or ultrasonic waves), and elastic waves can be cited.

As an example, a method for managing injection by simultaneously displaying the injection pressure and flow rate, P)(value), and density in accordance with the injection time of the injection liquid will be described below.

Figure 1 shows various concentrations of water glass with a molar ratio N = 3.21, that is, the N8203.218i02 concentration is n O,
05,0,10゜0.21.0.74.1.06 (mol/1) This is a graph showing the relationship between the pH value and gelation time for various injection liquids, and the pH value can be displayed from this graph. It is possible to identify whether a water glass injection solution that gels in a region where the irritability occurs is a water glass injection solution that gels in an acidic region, a neutral region, or an alkaline region, and the type of injection solution used. The relationship between water glass concentration, PH value 1, and gelation time can be known in advance.

Figure 2 is a graph showing the relationship between water glass blend concentration (mol/1) and density (f/crll・20°C) for the molar ratio N = 3.21 of the injection solution.0 Figure 2 shows the density. This makes it possible to identify the blended concentration of water glass, which is the main component, and to know in advance the relationship between the water glass blended concentration and the density of the injection solution to be used. Furthermore, from FIGS. 1 and 2 it can be identified that the water glass-based injection solution to be used has a composition that can gel within what time.

Figure 3 (a), (b), and (c) show the PH value and density (I) of the injected liquid corresponding to the injection time (1"), respectively.
A specific example according to the present invention will be shown in which values of injection pressure (P), and flow rate (Q/min) are displayed simultaneously to manage injection.

Figure 3(a) shows that P gradually increases after a predetermined injection amount is injected.
The curve rises, indicating a normal injection situation.

Figure 3 (bl is the injection pressure (Pl) that suddenly increases with a small injection amount
has increased, indicating an abnormal injection situation, but this is due to a decrease in the pH value, and therefore, the decrease in water glass concentration is still due to the acidic reactant being sent too much. Since it can be seen from the zero curve that the water glass concentration is being sent correctly, it can be seen that the reason for this is that the amount of reactant mixed is too large.

Figure 3 (c) shows an abnormal injection condition in which the maniac pressure (P) does not increase no matter how much pressure is injected.The cause of this is an increase in the water glass concentration or an insufficient amount of acidic reactant rather than an increase in the pH value. It is estimated that this is due to the 0 curve, and it can be determined that the water glass concentration is too low from the 0 curve.

In this way, the present invention records a curve indicating the characteristic values of the injectable liquid, which is composed of qualitative and quantitative characteristics, along with the PQ curve, thereby making it possible to identify the currently injected injectable liquid, determine whether the formulation is appropriate, analyze abnormalities, etc. This makes it possible to perform reliable injection management, making it possible to establish an injection method that is both safe and reliable in terms of pollution.

FIG. 4(a) is a longitudinal cross-sectional view of a concentration measuring device using a radiation transmission type densitometer used when carrying out the method of the present invention, and FIG. In the cross-sectional view taken from the line, (1) is a pipe body, and (2) is a flange, which are connected so as to constitute a part of a flow path for an injection liquid leading to an injection tube shown later. (3) is a radiation source, (4) is a radiation detector,
(5) is a radiation-fast material, (6) is a high-voltage power supply for the detector (4), and (7) is a circuit that counts the pulse signals detected by the detector (4). A counting/calculating device (8) having a calculation circuit for calculating the concentration is a container for housing these, and (1) to 8) constitute a radiation transmission type concentration measuring device (9).

This concentration measuring device (9) uses cobalt-60 as a radiation source (3).
When using a gamma ray source such as G N, I counter etc. as the detector (4), it is possible to measure the density of the solution flowing inside the tube body (1), and from this density value, the The concentration of the solution can be determined. That is, if the incident intensity of the gamma ray is Io, the transmitted intensity is D, and the density of the solution is ρ, then I/Io = eXp(-al)) (where a is a constant), and the density ρ and the intensity ratio I/Io There is an exponential regression relationship between them. Therefore, if the transmission intensity 1 is measured, the solution density ρ
can be calculated, and if the solution is one in which the solute and solvent have different densities, such as water glass grout, the concentration C can be determined from the density ρ. In addition, since the counting rate n of the detector (4) is proportional to the transmitted intensity of gamma rays, if the relationship between a solution whose concentration (density) is known and the counting rate n is determined in advance, the counting rate n of the detector (4) can be calculated. The concentration C of the solution can be determined from n.

FIG. 4(C) is a diagram showing the relationship between the counting rate n, the concentration C, and the density ρ for water glass grout.

In addition, this concentration measuring device (9) uses a fast neutron source such as californium-252 as the radiation source (3), and the detector (
For example, 4) may be configured using a radiation transmission swelling moisture meter using a high-speed neutron detector in which a -lium(3) neutron detector is wrapped in a neutron moderator. In this case, the pipe body (1)
The amount of hydrogen, ie, the amount of water, in the solution flowing inside can be measured, and the concentration C of the solution can be determined from this.

Figure 4(d) is a diagram showing the relationship between the counting rate n determined for water glass grout of known concentration and the water content of the solution;
Similarly, el is a diagram showing the relationship between the counting rate 1] and the concentration C of the solution.

FIG. 5 is a cross-sectional view of another radiation reflection type concentration measuring device (101) used to carry out the method of the present invention, (II) is a solution container, and α2 is a recorder for recording output data of a counting/computing unit. It is.

This concentration measurement device uses a radiation reflection density meter that combines a gamma ray source and a gamma ray detector, and a device that uses a fast neutron source and a thermal neutron detector such as a -lium(3) neutron detector. There is a type that uses a radiation reflection type moisture meter, and the former can measure the density of a solution, and the latter can measure the water content of a solution. The concentration al can be determined.

Next, an injection control method according to the present invention using this concentration measuring device and PH detector together with a pressure gauge and a flow meter will be explained.

Fig. 6 is a block diagram of an embodiment in which the present invention is applied to the injection method using the 1.0 shot method, where θ3) is the A liquid tank, (1
4) is the B liquid tank, 0■ is the mixing tank, (16) is the injection pump,
a7) is a flow meter, position is a pressure gauge, a9) is an injection pipe, (20
) is an arithmetic and control unit (hereinafter abbreviated as CPU), G3+ is a PH detector, (34) is a branch pipe, (2υ) is a valve, and the detected value or PH value of the concentration measuring device (9) is predetermined. Adjust the opening degree of valve CD (22) to the value set, or
It is also possible to adjust the composition of liquid and B liquid.

Further, with the recorder 02), it is also possible to record each data of the concentration C of the injection liquid, the PH value, the injection amount, and the injection pressure P over time. Although not shown, it is of course possible to automatically perform these operations using a controller that includes a sequence circuit.

Therefore, in addition to the conventional 'I''-P-Q curve, data on the concentration C of the injected liquid or even PH value data are also recorded, which has the effect of more reliable management of construction quality. ○ Figure 7 is a block diagram of another embodiment in which the present invention is applied to the injection method using the 1. o shot method. The concentration of liquid A is measured by the detector (33) and the concentration is measured by the concentration measuring device 00.
) is configured to measure and record each. In this way, the mixing ratio of the injection liquid is determined based on the detected values of the concentration measuring devices (9) and (10), and the mixing ratio of liquids A and B is determined based on the concentration of liquid A, so that An advantage added to the embodiment shown in FIG. 6 is that the mixing ratio of the active ingredients contained in the injection solution can be adjusted within a certain range.

FIG. 8 is a block diagram of an embodiment in which the present invention is applied to a 1.5 shot injection method.
) + (Ibb) is a double infusion pump, (23) is a)'-shaped tube, (24) is a brushing mixer, (25
), (261 is a return pipe. In this example, as in the example shown in FIG. 7, the concentration of the A solution, the concentration of the injected solution, and the PH value are measured and recorded together with the Q and P values, respectively. It has similar advantages.

FIG. 9 is a block diagram of still another embodiment of the present invention, in which liquid A and liquid B are injected into the ground using a double injection pipe.
, injection by the zero shot method]-method. In the figure, (27) is an injection pipe configured as a double pipe;
(28) is a double pipe swivel attached to the head of the injection tube (27), which moves the injection pump (16a), (
16b), liquids A and B are injected at a constant volume ratio, so the flow rate and injection pressure of liquid A are in a constant relationship with the flow rate and injection pressure of liquid 13, and the mixing of liquids 9A and B. The ratio will be a constant ratio. If it can be guaranteed that the concentration of liquid B is adjusted to the specified value, measure the concentration of A'e or even the PH value as in this example, It is considered that simply recording the information is sufficient for managing the injected drug solution.

Figure 10 is a block diagram of an embodiment in which the present invention is applied to the step injection method using the 2.0 shot method. Two combinations of liquids A2 and B2 are prepared, and the injection liquid with a short gel time and the injection liquid with a long gel time are switched and injected according to a predetermined program, and then the injection position is sequentially moved. It is.

Conventionally, such switching of the injection liquid has not been performed by operator operation, but an injection program is stored in advance in the CPU (20), and the valve (29) is changed according to this program.
By controlling the opening and closing of ) to (32), the switching of the injection liquid can be automated, and the switching of the injection liquid can be recorded as a change in concentration, which can be used as reliable data for construction management.

Note that this example describes an example of program control, but
In addition, even if the injection liquid is switched based on the integrated value of the injection pressure P and the injection amount Q, the switching state can be recorded as a change in the concentration of the injection liquid or a change in Pi, which can be used for construction management as in the above example. , it can be used as a nagingan deri.

Note that the concentration measurement device (9) and the position of the Po detector are not limited to the positions shown in each of the above embodiments, and the concentration of the target injected liquids A and B is uniform. Anywhere within the flow path is acceptable.

Although the above embodiments show examples in which measurements are taken continuously and recorded, measurements may also be made at appropriately determined regular time intervals.

In the above example, the concentration was calculated and recorded from the counting rate n, but since the division rate n of the radiation detector may be approximately proportional to the concentration of the solution within a certain range, In that case, even if the divisor ratio n is recorded as is, it will not be used as management data.

In each of the above embodiments, the concentrations of liquid A 1, liquid B, and injection liquid are measured and recorded, but the detected values of liquid density and water content are used as management data as they are. However, it is also possible to record the detected value as an index symbol, etc., and use this as a management data.

The above is an example of a combination of a pressure gauge, a flow meter, a PH detector, and a density detector, but it is also possible to use a conductivity detector (or specific resistance value detector), viscosity detector, elastic wave measurement, and sonic wave measurement. You can also make a skewer by combining a device (or an ultrasonic measuring device).

Among these, the value of conductive dust (u U / cm ) increases when there are many dissolved ions in water, and decreases when there are few dissolved ions.The degree differs depending on the individual ions, but if there is only one type of dissolved ion, Even if there are many types of dissolved substances, if the composition ratio is constant, a proportional relationship will almost be established between the concentration of dissolved substances (ionic) and conductive dust.

Therefore, by measuring conductive dust, the type and concentration of the components can be estimated, and this is particularly effective for water glass grout.

For example, the relationship between water glass concentration and conductive dust is shown in Table 1.1 Table 1 From this, conductive dust (same as the specific resistance value) is also a coefficient representing chemical properties, and is a coefficient representing the concentration of the ingredients of the injection liquid. It turns out that it also becomes.

Furthermore, the relationship between viscosity and concentration in water glass (No. 3 water glass stock solution) is shown in FIG.

From this, it can be seen that viscosity is a coefficient representing the concentration of the ingredients of the injection solution.

Since the measured values of elastic waves and the measured values of sonic waves (or ultrasonic waves) are related to the density of the liquid, these can also be used as coefficients representing the concentration of the components of the injection liquid.

Note that the detector that measures the characteristic values of the injected liquid, such as Pi (value, electrical conductivity, specific resistance value, density, and viscosity), can be installed at any location along the route from the mixing tank to the injection pipe. Further, it may be located in either or both of the main material pipe and the reactant pipe, or in the pipe for the mixed liquid of the main material and the reactant.

If measurement is still difficult under pressure due to injection pressure, it may be arranged in a branch pipe extending from the pipe line or in a container connected to the branch pipe, and it is particularly preferable to arrange P and the detector in this manner.

As described above, the present invention 1 is effective not only for construction management but also for construction quality management, and is a practically extremely useful invention.

[Brief explanation of the drawings] Figure 1 shows a graph showing the relationship between water glass concentration, PH value, and gelation time, and Figure 2 shows a graph showing the relationship between water glass concentration and density. Figure 3(a), (
b) and (c) are PH value, density 0, and injection pressure CP, respectively.
) and flow rate (Q) are displayed simultaneously corresponding to time ■.
) is a longitudinal cross-sectional view of the radiographic concentration measuring device used in the present invention, FIG. 4(b) is a cross-sectional view taken from line II-■ in FIG. 4(a), and FIG. 4(c) is a gamma-ray transmitting type. Figure 4(d) is a diagram showing the correlation between the counting rate of the densitometer and the density (concentration) of the solution. FIG. 4(e) is a diagram showing the correlation between the counting rate and the concentration of the solution, FIG. 5 is a cross-sectional view of another radiation reflection type concentration measuring device used in the present invention, FIGS. 6, 7, FIG. 8, FIG. 9, and FIG. 10 respectively show block diagrams of embodiments of the injection management method according to the present invention using a concentration measuring device and a PH detector together with a flow meter and a pressure gauge. FIG. 11 shows a graph showing the relationship between the concentration and density of water glass. 1...Pipe body, 2...Flange, 3...Radiation source, 4...Radiation detector, 5...° radiation fastening material, 6...High voltage power supply, 7...Counting arithmetic unit,
8... Container, 9... Radiographic concentration measuring device, 1
0...Radiation reflection type concentration measuring device, 11...Container, 12...Recorder, 1:...A liquid tank, 14...
...B liquid tank, 15...mixing tank, lt], 1lia,
1bb...pressure pump, 17...flow meter, 18.
... Pressure gauge, 19 ... Injection pipe, 20 ... Arithmetic processing unit (CP [J bar 2+, 22, 29.: 30, 3], 32
Valve, 23... Y-shaped pipe, 24... Brushing mixer, 25.26... Return pipe, 27... Double injection pipe,
28...Double tube, swivel, 33...PH detector,
34...Branch pipe. Patent Applicant Reinforced Soil Engineering Co., Ltd. Figure 2 Nazo 3.215i02 tl-'1-r-9 Answer Figure 9 te) (C) Boq area ship? 5 area should Figure 11 sa, zo i, zy 5ioz J and (?72~U procedural amendment sound (riho) Commissioner of the Patent Office, Wakasaita /41 ta Tonochibo 57J
f-chigo-sinkarishin//, 9θθ/Relationship with the Sawa incident Patent applicant

Claims (1)

[Claims] When injecting liquid into the ground to solidify the ground,
In the injection management method for managing the injection by displaying the injection pressure and flow rate of the injection liquid corresponding to the injection time of the injection liquid, in addition to displaying the injection pressure and flow rate, the chemistry of the injection liquid is displayed. 1. An injection management method, characterized in that the injection is managed by displaying a coefficient representing a characteristic characteristic and/or a coefficient representing a concentration of a component of the injection liquid simultaneously with the display of the injection pressure and flow rate.