JPH0649836A - Grouting system - Google Patents

Abstract

PURPOSE:To improve the workability by filling plural filling liquids, of which solidification time is different from each other, from plural fill-in ports of different positions in the axial direction of a filling pipe, simultaneously, and changing each flow quantity of the main agent and the reaction agent to change the mixture ratio. CONSTITUTION:Plural fill-in ports 3 are provided at different positions in the axial direction of a filling pipe X, which consists of an outer tube 1 and an inner tube 2, and the outer tube 1 and the inner tube 2 are communicated with each other through a discharge port. At least two of the fill-in ports 3 are formed so as to have different flow quantity ratio of discharge quantity of the main agent A liquid and the reaction agent B liquid to be discharged from pipelines A, B. Plural filling liquids, which are joined for mixture inside of the fill-in port 3 and of which solidification time is different from each other, are filled from the plural fill-in ports 3 to the ground. The main agent A liquid and the reaction agent B liquid are respectively fed by pumps PA, PB, and the flow quantity is controlled by pumps PA', PB' to change the liquid feeding ratio of the A, B liquids. Ground can be thereby solidified quickly and easily, and the gelation time of the filling liquids, of which gelation time is different from each other, can be changed without generating time lag.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention has a setting time (gelation time).
The present invention relates to a ground pouring system suitable for a composite pouring method in which a plurality of pouring materials (grouts) of different porosity are simultaneously injected through pouring ports installed at different positions in the axial direction of a pouring pipe installed in the ground. The present invention relates to a ground injection system in which the liquefaction time can be changed immediately without causing a time lag and the composite injection can be accurately achieved.

[0002]

2. Description of the Related Art Generally, a so-called composite pouring method is used as a technique for improving a complicated ground, in which a grout having a short setting time and a grout having a long setting time are poured into the ground.
Conventionally, this type of composite pouring method uses a double pipe to inject grout with a short setting time into the ground to fill the rough parts, weak parts or voids around the injection pipe, and then set the setting time. It is known that a long grout is injected between soil particles to penetrate into the ground.

In the above-mentioned composite injection method, an injection method in which grout having a short setting time is injected from the upper discharge port of the double pipe and grout having a long setting time is injected from the lower discharge port of the double pipe at the same time. Is also known.

Furthermore, a confluent liquid of two liquids separately fed from two pipe lines using a triple pipe (injection liquid having a short setting time)
There is known a composite injection method in which grouting is injected from the upper discharge port and simultaneously grout having a long setting time is injected from the lower discharge port.

[0005]

However, in the former construction method using a double pipe, grouts having different setting times are separately injected, and therefore it is necessary to switch these grouts during injection. The operation is complicated and quick and easy 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 description, in order to change the gelling time of grout, the circuit of the reagent-containing liquid must be changed in the above-ground portion. At this time, there is a time lag until the converted reactant is sent to the injection port of the injection pipe, and the conversion of the gelation time at a predetermined injection stage does not coincide with the conversion of the gelation time at the above-ground part. It will be. Therefore, the injection operation becomes inaccurate, and it is difficult to perform the composite injection accurately.

In the latter method using a triple pipe, it is possible to simultaneously inject grout with different setting times. However, since it is a triple pipe, the diameter of the injection pipe hole is large, the drilling cost is high, and the construction efficiency is high. Becomes worse. Furthermore, this method requires complex adjustments of the main material, the reaction mixture composition for flash setting, and the reaction composition preparation for slow setting, which is complicated.

Usually, the ground to which the pouring method is applied is soft ground, but in this ground, it is customary that layers having different water permeability are piled up in the horizontal direction during the ground formation process. The hydraulic conductivity is larger in the horizontal direction than in the vertical direction, so that the injected injection liquid (grout) deviates through the injection pipe into a layer having a high hydraulic conductivity.

Therefore, the object of the present invention is to rapidly and easily solidify the ground by simultaneously injecting a plurality of injecting liquids having different setting times (gelling times) from a plurality of injection ports having different axial directions of the injection pipe. Needless to say, it is possible to change the gelling time of the injecting liquid with different gelling times injected from these inlets without causing a time lag, and it is suitable for the ground injection method in which the drawbacks in the above-mentioned known technology are improved. To provide a ground injection system.

[0010]

In order to achieve the above-mentioned object, according to the present invention, a storage system for storing a main material mixed solution and a reactant mixed solution, and a storage system installed in the ground, are provided in the storage system. The storage system includes a connected injection system and a supply system that is disposed between the storage system and the injection system and that supplies the mixed solution of the storage system to the injection system. Material injection tank and one or more reaction agent injection tanks, and the injection system has at least two conduits A and B, and an injection pipe having a plurality of injection ports at different axial positions. The injection port is provided with a discharge port that communicates with one of the pipe lines A, and at least one of the injection ports is provided with a discharge port that communicates with the other pipe line B, and the supply system includes the main material mixture. A pump that connects the liquid tank and the pipeline A PA, a pump PB that connects the reactant mixture liquid tank and the conduit B, and at least one other that connects the main material mixture liquid tank and the conduit A or the reactant mixture liquid tank and the conduit B. It is characterized by comprising a pump.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below 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 comprises a storage system I, an injection system II, and a supply system III.

The storage system I stores the main material mixed liquid (A liquid) and the reactant mixed liquid (B liquid), and contains one or a plurality of main material mixed liquid tanks C and one or a plurality of liquids. It is composed of a reagent mixture tank D. The main material mixture liquid (liquid A) is, for example, a water glass aqueous solution, a mixture liquid of water glass and a reaction agent, an acidic silicic acid aqueous solution, or a main material of an injection liquid other than water glass grout, and the reactant mixture liquid (liquid B) is When the gelling agent for glass, 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 conduits A and B, and also has a plurality of injection ports 3 at different axial positions as described in detail with reference to FIG. Further, as will be described in detail with reference to FIG. 3 and subsequent figures, the injection port 3 is provided with a discharge port 11 which communicates with one of the conduits A, and at least one of the injection ports 3 has a discharge port which communicates with the other conduit B. An outlet 12 is provided. Of these outlets, at least the outlet 11 that communicates with the conduit A may be an ejector, and the outlet 12 that communicates with the conduit B may also be an ejector if necessary.

The supply system III is a storage system I and an injection system I.
It is arranged between the injection systems I and I and supplies the mixed solution of the storage system I to the injection system II. In this supply system III, a pump PA that connects the main material mixing liquid tank C and the conduit A of the injection pipe X via a valve VA, and the reactant mixing liquid tank D and the conduit B of the injection pipe X via a valve VB. Connected pump PB
And the main material mixture liquid tank C and the pipeline A, or the reactant mixture liquid tank D
And at least one other pump connecting the line B via valves VA, VB, eg pump P in FIG.
A'and a pump PB '. Pump PA ',
PB 'is a pump P via valves VA and VB, respectively.
Connected to the A and PB lines, these pumps P
A ′ and PB ′ are for changing the ratio of the A liquid and the B liquid sent to the injection pipe X by increasing or decreasing the flow rate of the A liquid or the B liquid from the pumps PA and PB.

FIG. 2 is a side view of a specific example of the double pipe X used in the present invention, which basically comprises an outer pipe 1 and an inner pipe 2 arranged therein. This double pipe X includes a quick-injection injection pipe body a and a slow-injection injection pipe body b, and the quick-injection injection pipe body a has an injection port 3 for injecting an infusion liquid 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 these injection tubes a and b, the instantaneous injection tube a is arranged in the upper part of the double tube X and the loose injection tube b is arranged in the lower part in FIG. 2, but this arrangement is arbitrary. Engagement is installed at a point. 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 pipe 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 sectional view of the injection port 3 of the instantaneous injection pipe a.

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

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

First, as shown in FIG. 3 (a), perforating water is fed in the direction of the arrow through the conduit 6 of the outer tube 1. As shown in FIG. 5 (a), this drilling water is sent to the end portion c and pushes down the spring 8 of the valve 7 to open the pipeline 6 a, and through the opened pipeline 6 a in the ground. And the double pipe X is set to a predetermined depth. At this time, since the inlet 3 in FIGS. 3A and 4A is closed by the opening / closing tip 5 made of metal or synthetic resin, the perforation water does not leak from here.

Next, as shown in FIG. 3 (b), when the main material mixture liquid A is fed from the outer pipe line 6 and the reactant mixture liquid B is fed from the inner pipe line 9 in the directions of the arrows, first, As shown in FIG. 5 (b), the reactant mixture liquid B drops the cylinder 10 at the terminal end c to close the outer pipe line 6 a. As a result, the reagent mixture liquid B in the inner pipe line 9 Is under pressure,
The closed bundle tip 5 of FIG.
It is blown off to the outside by the pressure of, and the injection port 3 is opened.

The inlet 3 is shown in FIGS. 3 (b), (c) and FIG.
As shown in (b) and (c), discharge ports 11, 11 ... 11 communicating with one pipeline A, for example, the outer pipeline 6, are provided, and at least one of the injection ports 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 inlets 3, 3, ... 3 are discharged from one pipeline A (outer pipeline 6) and the other pipeline B (inner pipeline 9). 2) are formed so that the flow rate ratios of the discharge amounts from) are different. Specifically, for example, one injection port 3 is shown in FIGS. 2 (a), (b), (c),
In particular, as clearly shown in FIG. 3C, one discharge port 11 (diameter Φ1.0 mm) communicating with the outer pipe conduit 6 is provided, and a discharge port 12 (respectively diameter Φ1.mm) communicating with the inner pipe conduit 9 is provided. 2 (0 mm), and the other one injection port 3 is shown in FIG.
(B), (c), especially as clearly shown in FIG. 4 (c),
Discharge ports 11 (diameter Φ1.0 mm) communicating with the outer pipe line 6 and discharge ports 12 (diameter Φ1.0 mm) communicating with the inner pipe line 9 are provided one by one. As a result, the discharge port 11 leading to the one pipeline A
And at least two inlets 3 having different ratios of the number of outlets 12 communicating with the other conduit B are formed,
These at least two inlets 3 are formed so that the flow rate ratio of 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 port diameter may be changed.

When the closed bundle tip 5 of FIGS. 3 (a) and 4 (a) is removed and the injection port 3 is opened, FIG. 3 (b),
As shown in (c) and FIGS. 4 (b) and (c), the main material mixed liquid A and the reactive agent mixed liquid B are discharged from the discharge port 11 and the discharge port 12 into the spout 3, respectively, and mixed. As a result, a plurality of infusates having different setting times are formed.

These plural injection liquids are simultaneously injected into the ground through the aforementioned plural injection ports 3, 3 ,.
These injection liquids are supplied from the conduits A and B to the respective injection ports 3, 3, ... 3
The setting time is adjusted within 15 minutes and the shorter setting time is adjusted within 30 seconds according to the flow rate of the compounded liquid discharged into the inside. In addition, in the present invention, it is also possible to use an infusion solution longer than the setting time of these infusion solutions together.

The flow rate ratio of these liquids A and B to the inlet may be 1: 1 and other flow ratios can be selected. Further, this ratio may be changed during the injection.

FIGS. 6, 7 and 8 (a) and 8 (b) are sectional views showing the method of the present invention using another type of injection pipe, and FIG. 6 shows the injection state, and FIGS. 7 (a) and 7 (b) show examples of the injection port.

The above-mentioned injection pipe is a double pipe X composed of an outer pipe 1 and an inner pipe 2 as in FIG. 2, but a closed bundle 14 is slidably fitted to the end of the inner pipe 2. 2 and that three injection ports 3 are provided at different axial positions, that is, different vertical positions. Moreover, these inlets 3
Are different in the ratio of the numbers of the discharge ports 11 communicating with the outer pipe conduit 6 and the discharge ports 12 communicating with the inner pipe conduit 9, respectively.
Therefore, as will be described later, the gel times of the AB confluent liquids discharged and mixed at the respective inlets 3 are all different.

First, as shown in FIG. 6, each injection port 3
With the closed bundle tip 5 fitted thereinto, the double pipe X is set at a predetermined depth in the ground by excavating the metal crown 4 while feeding the drilling water through the outer pipe line 6. Since the closed bundle tip 5 is fitted in each of the inlets 3, the drilling water is discharged into the ground through the outer pipe lines 6 and 6a without leaking.

After the excavation, as shown in FIG. 7, when the main material mixed solution A is fed through the outer pipe line 6 and the reactant mixed liquid B is fed through the inner pipe line 9, respectively, first, The reactant mixture liquid B pushes down the closing 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 mixture liquid B in the inner pipe line 9 is also in a pressurized state, and the closed bundle tip 5 in FIG. 7 is blown out and the injection port 3 is opened.

Thereafter, the liquid A in the outer pipe line 6 and the liquid B in the inner pipe line 9 are respectively discharged into the discharge port 1 through the opened injection port 3.
It is discharged through 1 and 12 and mixed.

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

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

In the present invention, the compounded liquid is discharged from a plurality of outlets communicating with one of the channels of the injection pipe at a high pressure (10 kgf / cm ² at the aerial part, preferably 15 kgf / cm ² ) by the injection port, and the other. The compounded liquid may be discharged from the discharge port communicating with the pipe line at a high pressure by the injection port, or may be discharged to the extent that the internal pressure of the pipe is hardly applied in some cases. The diameter of the discharge port is 0.
It is preferably about 2 to 2.0 mm. Further, in the present invention, the internal pressure of the tube may be several hundred kgf / cm ² . Further, a gas or a fluid other than the injecting liquid may be pressed into the injection pipe together with the injecting liquid or in advance of the injecting liquid, so that the injecting liquid can be easily permeated or mixed into the ground.

In general, when a liquid is pumped at a high pressure into a pipe provided with n discharge ports each having a fine hole of the same diameter, the liquid is sprayed from each discharge port in a uniformly divided amount of 1 / n. As the flow rate increases, the pipe pressure increases, and when the pressure is much higher than the resistance (ground injection pressure) outside the discharge port, the discharge is performed in a uniform amount without being substantially affected by the outside 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 thus discharged are combined and mixed in the mixing chamber of the injection port and injected into the ground.

[0035]

The present invention described above is a double injection pipe having a plurality of injection ports at different axial positions, each of the injection ports being provided with a discharge port communicating with one of the conduits A, and At least one of the inlets is provided with a discharge port that communicates with the other conduit B, and at least two of the plurality of inlets are discharged from one conduit A and discharged from the other conduit B. Since the injection pipes are formed so that the flow rate ratios of the amounts are different, it is possible to simultaneously inject a plurality of injecting liquids having different consolidating times from a plurality of injecting ports, which can consolidate the ground extremely quickly and easily. It is a thing.

Further, the present invention provides a supply system III,
Pump PA for connecting the main material mixed liquid tank and the pipeline A
And a pump PB connecting the reagent mixture tank and the conduit B, and at least one other pump connecting the main material mixture tank and the conduit A or the reagent mixture tank and the conduit B. , For example because it comprises a pump PA ′ or PB ′,
These pumps PA 'and PB' are pumps PA and P, respectively.
By increasing or decreasing the flow rate of the A liquid or the B liquid from the B, the ratio of the A liquid and the B liquid sent to the injection pipe X is changed, and as a result, a time lag of the gelation time of the injection liquid occurs. Without changing the gelation time, it is possible to easily respond to changes in the ground condition and the injection condition.

In general, in the above-ground portion, when the fluid in the injection pipe is discharged from the discharge port into the air, the pressure in the injection pipe depends on the size and flow rate of the discharge port. Further, as the flow rate is increased with respect to the diameter of the discharge port, 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 injection pipe internal pressure, that is, the discharge pressure becomes small. Also, the fluid pumped through the injection pipe line is injected from the injection port in a predetermined amount corresponding to the size of the discharge port diameter. The higher the pressure inside the pipe, the more difficult it is for the amount of injection 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 pumping water to a pipe with an inner diameter of 4 cm, almost no pump pressure is generated. 9 and 10 show the results of measuring the injection pressure (pump pressure) and the discharge amount by mounting the tip portion having the injection port at the end of this pipe. For comparison, a tip having three discharge ports each having a diameter of 1 cm was attached to the end of the pipe to feed water of 1 to 20 l / m, but almost no discharge pressure was observed. .

FIG. 9 shows a nozzle having a nozzle diameter of 1.0 mm, and FIG. 10 has a tip having a discharge port of 1.5 mm, which is attached to a pipe, and various pump pressures are changed to send water so that the pump pressure maintains a predetermined pressure. Liquid is also connected to the downstream side of the injection port by a pipe line, and a resistance pressure is applied by a valve in the pipe line to generate a pressure equivalent to the resistance pressure of the ground, and the flow rate discharged from the injection port in that case ( 1 / min) and resistance pressure (kgf / cm ² ) were measured, and the results are shown in the graph. As can be seen from FIGS. 9 and 10, for example, using a pump pressure of 80 kg / cm ² , the resistance pressure (kg / cm ² ) changes even if the resistance pressure in the ground changes.
The flow rate from the nozzle is constant up to about 50 kg / cm ² . That is, it can be seen from FIGS. 9 and 10 that there is a region where a constant discharge amount can be obtained despite the change in the ground resistance pressure.

[0040]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described using the injection system of FIG. Using an injection pipe equipped with an injection port having a fine injection port with a diameter of 1.0 mm on the side wall of the injection pipe, and when the liquid A and the liquid B are respectively fed into the injection pipe at 10 l / min, the injection liquid is injected into each injection port. The same amount is distributed.
1

Therefore, if five injection ports are provided in the A liquid side conduit and six injection ports are provided in the B liquid side conduit, the respective injection amounts are 2 l / min and 1.67 / min. Also, when the pipe pressure is measured on the ground, A liquid side is 20 kgf / cm ² , B liquid side is 15 kgf / cm ² .
It becomes cm ² .

In the case of the PA and PB supply system paths shown in FIG. 11, the process is as follows. Injection ratio of AB liquid at the injection port of instantaneous setting grout (gelation time 5 seconds) = 1: 1.67 Injection amount of instantaneous setting grout: 5.3 l / min Injection ratio of AB liquid during injection of slow setting grout (gel Infusion time 20 minutes) = 1: 0.84 loose grout injection rate: 14.7 l / min

The flow rate of the liquid A was 10 l / min, and in order to shorten the gelation time, the pump PB 'line was opened and
When the liquid flow rate is 15 l / min, the result is as follows. The injection amount of the A liquid side injection port is 2 l / min, and the injection amount of the B liquid side injection port is
15 ÷ 6 = 2.5 l / min. Therefore, the injection ratio of the AB liquid at the inlet of the instantaneous setting grout is 2: 2.5 × 2 = 2:
5 = 1: 2.5, the gelation time became 15 seconds (Fig. 12), and the injection ratio of AB liquid at the inlet of the slow-flowing grout changed to 2: 2.5 = 1: 1.25, resulting in gelation. The time will be 5 seconds. (Fig. 12)

Thus, if the liquid feed ratio of AB liquid is changed,
In response to this, the injection ratios at the upper injection port and the lower injection port also change, and it is possible to obtain a plurality of gelation times corresponding thereto.

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

As shown in FIG. 11, the liquid A and the liquid B are injected at a rate of 10 l / min, and a separate pump is used to inject only the instantaneous grout as the instantaneous injection. Then, 5 l / min was added as shown by the dotted line in FIG. 11, and the solution B was injected at 15 l / min.

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

The use ratio of the injection liquid is 10% for instantaneous injection and 90% for basic injection. At the bottom of the injection stage, the total amount of instantaneous injection per injection is injected, and then the basic injection is performed per injection depth of 1 m.
After injecting 360 l each, the injection stage was moved.

After injection, the face of the starting part was observed,
A strong solidified body with a diameter of 15 to 20 cm is formed around the injection tube, a homogeneous solidified body is formed around it, and the solidified bodies of the adjacent injection tubes are completely continuous and solidified. It was In addition, neither uplift of the ground nor deviation of the injected liquid to the ground surface was observed.

FIG. 13 is a schematic view showing the injection state when the injection port of the injection pipe of the present invention is continuously installed up to the upper side.
In this case, it is possible to inject all the stages at once with one injection tube without pulling the injection stage upward. What is required is that even if the number of discharge ports is increased, the gelation time of each discharge port is different, and the injection resistance of the surrounding ground is different, the prescribed injection can be secured and the injection with a short gelation time is possible. When the injection port 3a for the liquid and the injection port 3b for the long gelation time are simultaneously injected, the injection liquid for the short gelation time is mainly composed of veins, and the injection liquid for the long gelation time is the soil particles. Since the penetration mainly takes place, the former will fill the rough and weak areas around the area earlier, and the latter will gradually penetrate into the smaller areas.
This is because reliable composite injection is possible. Note that, in FIG. 13, the injection port for the injection liquid having a short gel time and the injection port for the long injection liquid may be alternately provided in the vertical direction.

FIGS. 14 and 15 are explanatory views of another specific example according to the present invention, in which the injection pipe X is replaced with a predetermined ground Y to be injected.
In this example, a plurality of liquids A and B are simultaneously supplied to these injection pipes X via pumps PA, PB, PA ', PB' to inject and solidify the ground Y. In this case, the construction efficiency is immeasurably improved.

[0052]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a plurality of injection liquids having different setting times (gelation times) are simultaneously injected from a plurality of injection ports in different axial directions of the injection pipe, which makes the ground extremely quick and easy. Of course, it is possible to change the gelation time of the injection liquids having different gelation times injected from these injection ports without causing a time lag, which is a practically useful invention.

[Brief description of 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.

3A and 3B are enlarged cross-sectional views of the instantaneous injection tube body in FIG. 2, where FIG. 3A is a state during perforation, FIG. 3B is a state during injection, and FIG. 3C is a cross-sectional view of an injection port. .

4A and 4B are enlarged cross-sectional views of the loose injection tube body in FIG. 2, in which FIG. 4A shows a state during perforation, FIG. 4B shows a state during injection, and FIG. 4C is a sectional view of an injection port. .

5 is an enlarged cross-sectional view of the distal 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 being sent.

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

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

FIG. 9 is a graph showing a relationship between a resistance pressure and a flow rate from a nozzle due to a change in pump pressure for a nozzle diameter Φ1.0 mm.

FIG. 10 is a graph showing a relationship between a resistance pressure and a flow rate from a nozzle due to a change in pump pressure for a nozzle diameter Φ1.5 mm.

FIG. 11 is a flow sheet of a specific example of the system of the present invention.

FIG. 12 is a graph showing the relationship between the ratio of solution B / solution A and the gelation time.

FIG. 13 is a schematic diagram showing an injection state of a modified example of the present invention.

FIG. 14 is an explanatory diagram of another specific example according to the present invention using a plurality of injection tubes.

FIG. 15 is an explanatory diagram of still another specific example according to the present invention using a plurality of injection tubes.

[Explanation of symbols]

 1 Outer pipe 2 Inner pipe 3 Injection port 6 Outer pipe line 6a Outer pipe line 9 Inner pipe line 11 Discharge port 12 Discharge port 13 Closed layer 14 Closed bundle a Instant blink injection pipe b Loose injection pipe X Double pipe I Storage system II Injection system III Supply system

Claims (3)

[Claims] 1. A storage system for storing a main material mixed solution and a reactant mixed solution, an injection system installed in the ground and connected to the storage system, and arranged between the storage system and the injection system. A supply system for supplying the liquid mixture of the storage system to the injection system, the storage system including one or more main material mixture liquid tanks and one or more reactant mixture liquid tanks, The injection system has at least two conduits A and B, and is composed of an injection pipe having a plurality of injection ports at different axial positions, and the injection port is provided with a discharge port communicating with one of the conduits A, Further, at least one of the injection ports is provided with a discharge port that communicates with the other pipe line B, and the supply system is a pump PA that connects the main material mixture liquid tank and the pipe line A, and the reactant mixture liquid tank. And pipeline B
A pump PB for connecting the above, the main material mixture liquid tank and the pipeline A,
Alternatively, a ground injection system including at least one other pump that connects the reactant mixture tank and the pipeline B. 2. The number or diameter of the outlets is set so that at least two of the plurality of inlets have different flow rate ratios of the discharge amount from one pipeline A and the discharge amount from the other pipeline B. The ground injection system according to claim 1, wherein 3. The ground injection system according to claim 1, wherein at least the discharge port communicating with the conduit A is an injection port.