JP3151637B2 - Ground injection system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a consolidation time (gel time).
The present invention relates to a ground injection system suitable for a compound injection method for simultaneously injecting a plurality of injection materials (grout) having different diameters through injection ports at different positions in an axial direction of an injection pipe installed in the ground, and particularly to a gel of the injection material. Time without leaving time intervals
And a ground injection system capable of accurately achieving the composite injection.

[0002]

2. Description of the Related Art As a technique for improving a complicated ground, a so-called composite pouring method is generally used in which grout having a short setting time and long grout are poured into the ground.
Conventionally, as a composite injection method of this type, a grout with a short consolidation time is first injected into the ground using a double pipe to fill a rough part, a weak part, or a void around the injection pipe, and then a consolidation time There is known a method of injecting a grout having a long length between soil particles and infiltrating the ground.

In the composite injection method described above, grouting with a short consolidation time is simultaneously injected from the upper discharge port of the double pipe, and grout with a long consolidation time is simultaneously injected from the lower discharge port of the double pipe. Are also known.

Further, a combined liquid of two liquids separately sent from two pipes using a triple pipe (an injection liquid having a short consolidation time)
Is known from the upper discharge port, and at the same time, grout having a long consolidation time is injected from the lower discharge port.

[0005]

However, in the former method using a double pipe, grouts having different consolidation times are separately injected, so that it is necessary to switch these grouts at the time of injection. The operation is complicated and quick and simple injection is not possible. Furthermore, this method cannot increase the amount of liquid to be sent, resulting in low construction efficiency.

Further, in the above, in order to change the gelling time of the grout, it is necessary to change the circuit of the reactant compound liquid in the above-ground part. At this time, it takes time before the converted reactant is sent to the inlet of the injection tube.
Ri, a conversion of the gel time at a given injection stage,
The point of conversion of the gel time in the aerial part will not coincide. For this reason, the injection operation becomes inaccurate, and it is difficult to perform the composite injection accurately.

In the latter method using a triple pipe, grout having different consolidation times can be simultaneously injected. However, since the pipe is a triple pipe, the diameter of the injection pipe becomes large, drilling cost is high, and construction efficiency is high. Gets worse. Furthermore, in this method, it is necessary to adjust the mixing of the main material, the reactant compounding solution for instantaneous setting, and the reactant compounding solution for loosening, which is complicated.

[0008] Usually, the ground to be subjected to the injection method is soft ground. In this ground, layers having different water permeability are usually stacked horizontally in the ground formation process. The hydraulic conductivity is greater in the horizontal direction than in the vertical direction, so that the injected injection liquid (grout) deviates to a layer with a higher hydraulic conductivity through the injection pipe.

Accordingly, an object of the present invention is to rapidly and easily consolidate the ground by simultaneously injecting a plurality of injection solutions having different consolidation times (gelling times) from a plurality of injection ports having different injection pipes in the axial direction. Of course, it is possible to instantaneously change the gelation time of the injection solutions having different gelation times injected from these injection ports without time intervals.
Varied and without causing ie time lag is to provide a composite injection system of ground suitable for ground implantation method with an improved drawbacks existing in the known art described above.

[0010]

According to the present invention, there is provided a storage system for storing a base material compounding liquid and a reactant compounding liquid, and a storage system arranged in the ground and provided in the storage system. A connected injection system, and a supply system arranged between the storage system and the injection system for supplying a blended liquid of the storage system to the injection system, wherein the storage system is one or more main systems. A material mixing liquid tank and one or more reactant compounding liquid tanks, wherein the injection system has an injection pipe having at least two pipes A and B and having a plurality of injection ports at different positions in the axial direction. The inlet is provided with a discharge port communicating with one of the pipes A, and at least one of the inlets is provided with a discharge port communicating with the other pipe B, and the supply system is provided with the main material mixture. Liquid tank and the injection
The pump PA and the bus connecting the pipe A to the pipe, respectively.
A conduit a in which a lube VA is arranged, and said reactant
Connect the compounding liquid tank and the pipe B of the injection pipe, respectively
A conduit b in which a pump PB and a valve VB are arranged;
Further, the supply system further includes the main material mixing liquid tank and the bath.
A conduit for connecting the pump VA 'to the lube VA
a ', or the reactant-containing liquid tank and the valve VB
Fewer connecting conduits b 'in which the pump PB' is arranged
And the pump PA 'or PB'
Activate the main material compounding solution or the reactant compounding solution with the valve V
A or VB, where the pump PA or PB
Of the main material or the reagent mixture.
And the liquid is sent to the injection tube.
Freely change the mixing ratio between the main material compounding solution and the reactant compounding solution
It is characterized in that the liquid mixture in the storage system is supplied to the injection system .

[0011]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a flow sheet of a specific example of the ground injection system according to the present invention, which includes a storage system I, an injection system II, and a supply system III.

The storage system I is for storing a main material compounding liquid (Solution A) and a reactant compounding liquid (Solution B), and includes one or more main material compounding liquid tanks C and one or more liquid tanks. It is composed of a reactant compound liquid tank D. The main material compounding liquid (Solution A) is, for example, the main material of a water glass aqueous solution, a liquid mixture of water glass and a reactant, an acidic silicate aqueous solution or an injection liquid other than water glass grout, and the reactant compounding liquid (Solution B) is water. When the glass gelling agent, the cement suspension, or the solution A is an acidic silicic acid aqueous solution, it is water glass or alkali.

The injection system II comprises an injection pipe X and a ground Y
It is installed at a predetermined depth inside and is connected to a storage system II via a supply system III described later. The injection pipe X has at least two pipes A and B, and has a plurality of injection ports 3 at different positions in the axial direction as described in detail in FIG. Further, the inlet 3 is provided with a discharge port 11 communicating with one conduit A, and at least one of the inlets 3 is provided with a discharge communicating with the other conduit B, as will be described in detail in FIG. An outlet 12 is provided.

The supply system III comprises a storage system I and an injection system I.
I, and is for supplying the mixture of the storage system I to the injection system II. The supply system III connects a conduit A of main material blending tank C and injection tubes X, it
And a conduit a in which a pump PA and a valve VA are arranged.
For example, and contact the pipe B of the reaction blending liquid tank D and infusion tube X
The arrangement of the pump PB and the valve VB respectively
Provided conduit b . Further, the supply system III is provided with a pump PA ′ for connecting the main material mixing liquid tank C and the valve VA.
Conduit a 'or reactant-mixed liquid tank D and valve VB
And a small number of conduits b 'in which the pump PB' is arranged.
At least one. The pumps PA 'and PB' are connected to the systems of the pumps PA and PB via valves VA and VB, respectively. These pumps PA 'and PB' are used to supply the liquid A or the liquid B from the pumps PA and PB. The ratio of the solution A and the solution B sent to the injection pipe X is changed by increasing or decreasing the flow rate.

FIG. 2 is a side view of a specific example of the double tube X used in the present invention, and is basically composed of an outer tube 1 and an inner tube 2 disposed therein. The double tube X includes a flash injection tube a and a slow injection tube b. The flash injection tube a has an inlet 3 for injecting an injection solution having a short gelation time. The body b has injection ports 3, 3,... 3 for injecting an injection liquid having a long gelation time. In FIGS. 2A and 2B, the injection pipes a and b are arranged such that the instantaneous connection injection pipe a is disposed above the double pipe X and the loose connection injection pipe b is disposed below the double pipe X. It is engaged and installed at a location. c is the end of the double tube X, and 4 is a metal crown.

FIG. 3 is an enlarged cross-sectional view of the instantaneous injection tube body a in FIG. 2. FIG. 3 (a) shows a state during perforation, FIG. 3 (b) shows a state during injection, and FIG. () Shows a cross-sectional view of the injection port 3 of the flash injection tube body a.

FIG. 4 is an enlarged sectional view of the loosely-fused injection tube b in FIG. 2, wherein FIG. 4 (a) shows a state during perforation, FIG. 4 (b) shows a state during injection, and FIG. 3) shows a sectional view of the injection ports 3, 3,...

FIG. 5 is an enlarged sectional view of the end portion c of the double tube X in FIG. 1, and FIG.
(B) shows the state during the injection.

First, as shown in FIG. 3A, drilling water is supplied in the direction of the arrow through the conduit 6 of the outer pipe 1. As shown in FIG. 5 (a), the perforated water is sent to the end c, and the spring 8 of the valve 7 is depressed to open the conduit 6a, and through the opened conduit 6a, the ground is pierced. To set the double pipe X to a predetermined depth. At this time, since the injection port 3 shown in FIGS. 3A and 4A is closed with the opening / closing tip 5 made of metal or synthetic resin, no water leaks from the opening.

Next, as shown in FIG. 3 (b), when the main material mixed liquid A is sent from the outer pipe 6 and the reactant mixed liquid B is sent from the inner pipe 9 in the directions of the arrows, first, As shown in FIG. 5B, the reactant compound liquid B in the inner pipe line 9 is closed by dropping the cylinder 10 at the end c and closing the outer pipe 6a. Is pressurized,
The closed chip 5 shown in FIG. 3A and FIG.
And blows out outwardly to open the inlet 3.

The injection port 3 is shown in FIGS. 3B and 3C and FIG.
As shown in (b) and (c), one pipeline A, for example, outlets 11, 11,... 11 communicating with the outer pipeline 6 is provided, and at least one of the inlets 3 is provided. A discharge port 12 communicating with the other pipeline B, for example, the inner pipeline 9 is provided.

Further, at least two of the plurality of injection ports 3, 3... 3 are provided with a discharge amount from one pipe A (outer pipe 6) and another pipe B (inner pipe 9). ) Is formed so that the flow rate ratio of the discharge amount from (1) is different. Specifically, for example, one injection port 3 is shown in FIGS. 2 (a), (b), (c),
In particular, as clearly shown in FIG. 3 (c), one discharge port 11 (diameter φ1.0 mm) communicating with the outer pipe 6 is provided, and a discharge port 12 (diameter φ1. 0 mm), and the other injection port 3 is shown in FIG.
(B), (c), and especially as shown in FIG. 4 (c),
A discharge port 11 (diameter φ1.0 mm) communicating with the outer pipe 6 and a discharge port 12 (diameter φ1.0 mm) communicating with the inner pipe 9 are provided one by one. As a result, the discharge port 11 communicating with one pipe A
And at least two inlets 3 in which the ratio of the number of outlets 12 communicating with the other pipeline B is changed,
These at least two inlets 3 are formed such that the flow rate ratio between the discharge amount from one conduit A and the discharge amount from the other conduit B is different. Although the flow rate ratio of the discharge amount is not shown, the discharge amount can be changed by changing the diameter of the discharge port.

When the closed tip 5 shown in FIGS. 3A and 4A is removed and the injection port 3 is opened, FIG.
4 (c) and FIGS. 4 (b) and 4 (c), the main material compounding liquid A and the reactant compounding liquid B are respectively discharged from the discharge port 11 and the discharge port 12 into the spout 3 and mixed. Thus, a plurality of injection solutions having different consolidation times are formed.

The plurality of injection liquids are simultaneously injected into the ground from the plurality of injection ports 3, 3.
These injection liquids are supplied from the pipes A and B to the respective injection ports 3, 3,.
The consolidation time is adjusted to be within 15 minutes and the shorter consolidation time is to be within 30 seconds according to the flow rate ratio of the compounding liquid discharged into the inside. In the present invention, an infusion liquid longer than the consolidation time of these infusion liquids can be used in combination.

The ratio of the flow rates of the solution A and the solution B to the inlet may be 1: 1 or any other flow ratio. This ratio may be changed during the injection.

FIGS. 6, 7 and 8 (a) and 8 (b) are cross-sectional views showing the method of the present invention using another type of injection pipe, and FIG. 6 shows a state of feeding drilling water. 7 shows an injection state, and FIGS. 8A and 8B show examples of an injection port.

The above-mentioned injection tube is a double tube X composed of an outer tube 1 and an inner tube 2 as in FIG. 2, but a closed body 14 is slidably fitted to the end of the inner tube 2. 2 in that three injection ports 3 are provided at different positions in the axial direction, that is, at different positions in the upper and lower directions. Moreover, these injection ports 3
Are different from each other in the ratio of the number of the discharge ports 11 communicating with the outer pipe line 6 and the number of the discharge ports 12 communicating with the inner pipe line 9,
Therefore, as will be described later, the gel time of the AB combined liquid discharged and mixed at each injection port 3 is all different.

First, as shown in FIG.
Is drilled with the metal crown 4 while feeding drilling water through the outer pipeline 6 with the closing tip 5 fitted therein, and the double pipe X is set to a predetermined depth in the ground. The drilling water is discharged into the ground through the outer pipelines 6 and 6a without leaking from the closed tip 5 fitted in each injection port 3.

After the excavation, as shown in FIG. 7, when the main material compounding liquid A is sent through the outer pipe line 6 and the reactant compounding liquid B is sent through the inner pipe line 9 in the directions of the arrows, first, The reactant mixture B pushes down the closed bundle 14 fitted to the end of the inner pipe 6 to close the outer pipe line 6a. As a result, the outer pipe line 6 is closed, and the reactant compound liquid B in the inner pipe line 9 is also in a pressurized state, so that the closing tip 5 in FIG.

Thereafter, the liquid A in the outer pipe 6 and the liquid B in the inner pipe 9 are supplied to the opened injection port 3 respectively.
Discharged through 1 and 12 and mixed.

As shown in FIG. 8A, for example, the injection port 3 has two discharge ports 11 and 11 communicating with the outer pipe 6.
(Each diameter φ1.0 mm) and one discharge port 12 (diameter φ1.0 mm) communicating with the inner pipe 9, and the ratio of the number of these discharge ports 11 and 12 is 2: 1; As shown in FIG. 8 (b), one discharge port 11 (diameter Φ1.0 m) communicating with the outer pipe line 6 is formed.
m) and two discharge ports 12 and 12 (each having a diameter of Φ1.0 mm) communicating with the inner pipe line 9, and the ratio of the numbers of these discharge ports 11 and 12 is 1: 2. As shown in
Each of the outlets 11 and 12 communicates with the outer pipe 6 and the inner pipe 9, and the ratio of the number of the outlets 11 and 12 is 1: 1. Therefore, the flow rates of the AB merged liquids at the respective injection ports 3 are all different, and injection liquids having different gel times are injected into the ground from the respective injection ports 3.

The diameter of the discharge port is determined so that the injection material from the discharge port generates a pressure with respect to the flow rate in the injection pipe at the above-ground portion, and the discharge pressure is preferably 10 kgf / cm ² , more preferably 15 kgf / cm ^2. That is all.

[0033] In the present invention, a high pressure by the injection port of the liquid combination from a plurality of discharge ports leading to one of the conduit of the injection tube (10 kgf / cm ² on the ground portion, preferably 15 kgf / cm ²⁾ discharge at, and the other The mixed liquid may be discharged from the discharge port communicating with the pipe at a high pressure by the injection port, or may be discharged to such an extent that the pressure in the pipe is hardly applied in some cases. The hole diameter of the discharge port is 0.
It is preferably about 2 to 2.0 mm. In the present invention, the pressure in the pipe may be several hundred kgf / cm ² . Further, a gas or a fluid other than the injection liquid is injected into the ground together with or prior to the injection liquid into the injection pipe, so that the injection liquid can easily permeate or mix into the ground.

In general, when a liquid is pumped at a high pressure into a pipe having n discharge ports of the same diameter and provided in a pipe, an amount of the liquid equally divided into 1 / n is ejected from each discharge port. The pipe pressure increases as the flow rate increases, and when the pipe pressure is much higher than the resistance outside the discharge port (ground injection pressure), the pipe is discharged in a uniform amount almost without being affected by the external resistance. If the pipe pressure is the same, the discharge amount increases as the discharge port diameter increases. The injection pipe used in the present invention is configured so that the liquid A and the liquid B discharged in this manner are mixed and mixed in the mixing chamber at the injection port and injected into the ground.

[0035]

According to the present invention, there is provided a double injection pipe having a plurality of injection ports at different positions in the axial direction, wherein each of the injection ports is provided with a discharge port communicating with one conduit A, and At least one of the inlets is provided with a discharge port communicating with the other pipeline B, and at least two of the plurality of injection ports have a discharge amount from one pipeline A and a discharge amount from the other pipeline B. Since the injection pipes formed to have different flow rate ratios are used, a plurality of injection liquids having different consolidation times can be simultaneously injected from a plurality of injection ports, thereby consolidating the ground very quickly and easily. Things.

Further, the present invention provides a supply system III comprising:
A conduit a, in which a pump PA and a valve VA are respectively connected , is provided for connecting the main material compounding liquid tank and the pipe A of the injection pipe.
And a pump PB and a valve VB , respectively , for connecting the reactant-containing liquid tank and the pipe B of the injection pipe.
Conduit b, and a main material mixture tank and a valve VA.
And a conduit a 'in which the pump PA' is arranged,
Other connects and the valve VB reaction blending tank, pump
At least one of the conduits b 'in which the PB's are arranged,
Activate pump PA 'or PB' to mix
Introduces the reagent mixture into valve VA or VB, where
Liquid or reactant from pump PA or PB
Combine with the formulation to change these flow rates
Therefore, these pumps PA 'and PB' increase the flow rate of the liquid A or liquid B from the pumps PA and PB, respectively.
The ratio of the solution A and the solution B sent to the injection tube X is changed, for example, by reducing the amount, and as a result, the gelation time of the injection solution is temporally reduced.
It can be changed instantly without leaving an interval, and it can easily respond to changes in ground conditions and injection conditions.

In general, when the fluid in the injection pipe is discharged into the air from the discharge port in the above-ground portion, the pressure in the injection pipe depends on the size and flow rate of the discharge port. Also, as the flow rate increases with respect to the discharge port diameter, the pressure in the injection pipe, that is, the discharge pressure, increases. Further, when the discharge port diameter is large with respect to the flow rate or when the flow rate is small with respect to the discharge port diameter, the pressure in the injection pipe, that is, the discharge pressure becomes small. Further, a predetermined amount of the fluid pumped through the injection pipe line corresponding to the size of the discharge port diameter is injected from the injection port. And, as the pressure in the pipe is higher, the injection amount is less likely to change even if the resistance pressure outside the injection port changes.

Here, the injection function by injection in the present invention will be described. When water is pumped into a pipe having an inner diameter of 4 cm, almost no pump pressure is generated. FIGS. 9 and 10 show the results of measuring the injection pressure (pump pressure) and the discharge amount by attaching a tip having an injection port at the end of the pipe. For comparison, a tip having three discharge ports with a diameter of 1 cm was attached to the end of the pipe and water was supplied at a rate of 1 to 20 l / m. However, almost no discharge pressure was observed. .

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the injection system shown in FIG. When the solution A and the solution B are respectively fed into the injection tube at a rate of 10 l / min using an injection tube provided with an injection port having a fine injection port having a diameter of 1.0 mm on the side of the injection tube, the injection solution is supplied to each injection port. Dispensed in equal amounts.

Therefore, if five injection ports are provided in the liquid A side pipe and six injection ports are provided in the liquid B side pipe, the respective injection amounts are 2 l / min and 1.67 l / min. When the pressure in the pipe was measured on the ground, the liquid A side was 20 kgf / cm ² and the liquid B side was 15 kgf / cm ² .
f / cm ² .

The case of the supply system of PA and PB in FIG. 9 is as follows. Injection ratio of AB liquid at the injection port of flash grout (gel time: 5 seconds) = 1: 1.67 Injection amount of flash grout: 5.3 l / min Injection ratio of AB liquid during injection of loose grout (gel = 1: 0.84 Injection rate of loose grout: 14.7 l / min

In order to reduce the gelation time by setting the flow rate of the solution A to 10 l / min, further open the pump PB 'line,
When the liquid flow rate is 15 l / min, the following is obtained. The injection amount of the injection port on the liquid A side is 2 l / min, and the injection amount of the injection port on the liquid B side is
15 ÷ 6 = 2.5 l / min. Accordingly, the injection ratio of the AB liquid at the injection port of the instantaneously set grout is 2: 2.5 × 2 = 2:
5 = 1: 2.5, the gel time was 15 seconds (FIG. 10), the injection ratio of AB solution at the inlet of the above-mentioned loose grout was changed to 2: 2.5 = 1: 1.25, and the gel was formed. The time will be 5 seconds. (Figure 10)

As described above, if the feeding ratio of the AB solution is changed,
Accordingly, the injection ratio at the upper injection port and the lower injection port also changes, and a plurality of gel times corresponding to the injection rates can be obtained.

Injection liquid used: Solution A: aqueous solution of acidic silicic acid A water solution having a molar ratio of 2.7 and a specific gravity of 1.32 / 20 ° C. was mixed with sulfuric acid to prepare an aqueous solution of acidic silicic acid having a pH of 2.0. The water glass concentration is 25% by volume. Solution B: 25% by volume of water glass described above The gelation time corresponding to the confluence ratio of Solution A and Solution B is shown in FIG.

As shown in FIG. 9, the basic injection is to inject the liquid A and the liquid B at a rate of 10 l / min. When the injection of only the instantaneous grout is performed as the instantaneous injection, another pump is used. As indicated by the dotted line in FIG. 9, the solution B was added at a rate of 5 l / min and the solution B was injected at a rate of 15 l / min.

The present invention was tested at the launch site in the injection propulsion method. The site is an alluvial ground with a complex alternation of relatively soft cohesive and sandy soils with high groundwater. Using the present invention at an inlet pitch of 1 m, a section of GL-2.0 to 5.0 m, per 1 m of injection depth
400 l were injected. In the injection stage, the sample was shifted from the bottom to the top every 1 m.

The use ratio of the injection solution is 10% for instantaneous injection and 90% for basic injection. At the bottom of the injection stage, the entire amount of flash injection per one is injected, and then the basic injection is performed at an injection depth of 1 m.
The injection stage was shifted by injecting 360 l each.

After injection, the face of the starting part was observed.
A solid compact with a diameter of 15 to 20 cm is formed around the injection pipe, a uniform compact is formed around it, and the compacts of adjacent pipes are completely continuous. Was. In addition, no uplift of the ground or deviation of the injected liquid to the ground surface was observed.

FIG. 11 is a schematic view showing an injection state when the injection port of the injection tube of the present invention is continuously installed up to the upper side.
In this case, all stages can be injected at once with one injection tube without raising the injection stage upward. Even if the number of outlets is large, the gelation time of each outlet is different, and even if the injection resistance of the surrounding ground is different, a predetermined injection can be ensured and the injection with a short gelation time can be ensured. When the liquid injection port 3a and the injection liquid with a long gelling time are simultaneously injected from the injection port 3b, the injection liquid with a short gelation time is mainly pulsating, and the injection liquid with a long gelation time is soil particles. Since the former mainly fills the gap, the former fills the rough and weak parts around the former earlier, and the latter gradually penetrates into the finer parts.
This is because reliable composite injection is possible. In FIG. 11, the injection port for the injection liquid having a short gelation time and the injection port for the injection liquid having a long gelation time may be provided alternately in the vertical direction.

FIGS. 12 and 13 are explanatory views of another embodiment according to the present invention, wherein an injection pipe X is connected to a predetermined ground Y to be injected.
In this example, liquid A and liquid B are simultaneously supplied to these injection pipes X via pumps PA, PB, PA ', and PB', and the ground Y is injected and solidified. In this case, the construction efficiency is immeasurably improved.

[0051]

As described above, according to the present invention, the ground can be extremely quickly and easily formed by simultaneously injecting a plurality of injection solutions having different consolidation times (gelling times) from a plurality of injection ports different in the axial direction of the injection pipe. Can be consolidated, and the gelation time of the injection solutions having different gelation times injected from these injection ports can be changed without causing a time lag, which is a practically useful invention.

[Brief description of the drawings]

FIG. 1 is a flow sheet of a specific example of a ground injection system according to the present invention.

FIG. 2 is a side view of a specific example of an injection tube used in the present invention.

3 is an enlarged cross-sectional view of the flash injection tube shown in FIG. 2, (a) shows a state during perforation, (b) shows a state during injection, and (c) is a cross-sectional view of an injection port. .

4 is an enlarged cross-sectional view of the loosely-fused injection pipe body in FIG. 2, wherein (a) shows a state during perforation, (b) shows a state during injection, and (c) is a cross-sectional view of an injection port. .

5 is an enlarged cross-sectional view of an end portion of the injection tube in FIG. 2, (a) showing a state during perforation, and (b) showing a state during injection.

FIG. 6 is a cross-sectional view of another type of injection pipe according to the present invention, showing a state in which drilling water is supplied.

7 is a cross-sectional view of an injection tube of the type shown in FIG. 6, showing an injection state.

FIG. 8 is a cross-sectional view of a specific example of an injection port according to the present invention, in which (a) is an example in which two discharge ports communicate with an outer pipeline and one discharge port communicates with an inner pipeline. (B) is an example in which there is one discharge port leading to the outer pipeline and one discharge port leading to the inner pipeline.

FIG. 9 is a flow sheet of a specific example of the system of the present invention.

FIG. 10 is a graph showing the relationship between the ratio of solution B / solution A and the gelation time.

FIG. 11 is a schematic diagram showing an injection state according to a modified example of the present invention.

FIG. 12 is an explanatory view of another specific example according to the present invention using a plurality of injection tubes.

FIG. 13 is an explanatory view of still another specific example according to the present invention using a plurality of injection tubes.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer pipe 2 Inner pipe 3 Inlet 6 Outer pipe 6a Outer pipe 9 Inner pipe 11 Discharge port 12 Discharge port 13 Blocking layer 14 Closed body a Flash-injected pipe b Loose-injected pipe X Double tube I Storage system II Injection system III Supply system

Continuation of the front page (56) References JP-A-1-163310 (JP, A) JP-A-64-83719 (JP, A) JP-A-50-9914 (JP, A) JP-A-2-204520 (JP, A) , A) JP-A-60-252685 (JP, A)

Claims (2)

(57) [Claims] 1. A storage system for storing a main material mixed liquid and a reactant mixed liquid, an injection system arranged in the ground and connected to the storage system, and an injection system arranged between the storage system and the injection system. A supply system that supplies the liquid mixture of the storage system to the injection system, wherein the storage system includes one or more main material compound liquid tanks and one or more reactant compound liquid tanks, The injection system has at least two pipelines A and B, and includes an injection pipe having a plurality of injection ports at different positions in the axial direction, and the injection port is provided with a discharge port communicating with one of the pipelines A. In addition, at least one of the injection ports is provided with a discharge port communicating with the other pipe line B, and the supply system includes a pipe of the main material mixing liquid tank and the injection pipe.
Pump PA and valve V, respectively, connecting to
A comprising a conduit a disposed therein, and the reactant-containing liquid
Pumps for connecting the tank and the pipe B of the injection pipe, respectively
A conduit b in which the PB and the valve VB are arranged;
The supply system includes the main material mixture tank and the valve VA.
And a conduit a 'in which the pump PA' is arranged,
Or connecting the reactant-containing liquid tank to the valve VB.
At least one of the conduits b 'in which the pump PB' is located.
To operate the pump PA 'or PB'
Then, the main material compounding solution or the reactant compounding solution is supplied to the valve VA or
Is introduced into VB, where the mains from pump PA or PB
And the flow rate of these
Of the main material supplied to the injection pipe.
While freely changing the mixture ratio of the mixture and the reactant mixture
Supplying the liquid mixture of the storage system to the injection system.
And the composite injection system of the ground. 2. The number or diameter of the outlets of at least two of the plurality of inlets is such that the flow ratio of the amount of discharge from one of the pipes A to the amount of discharge from the other of the pipes B is different. 2. The composite ground injection system according to claim 1, wherein