JPH06299536A - Injection of ground improvement agent and ingection tube - Google Patents

Abstract

PURPOSE:To simultaneously inject an agent from a plurality of outlets at a specified delivery rate to percolate an objective ground regardless of variation of ground conditions and at the same time to evenly percolate it so as to achieve the solidified effect without breakage of the structure of soil particles in the objective ground. CONSTITUTION:In an injection tube 1 having at least one pipe line 2a and provided with a plurality of outlets 4,... communicating with the pipe line at different positions in the axial direction, to supply an injection liquid to solidify the ground through the pipe line and simultaniously inject it from a plurality of outlets into the ground, a liquid chamber 6 is equipped at an arbitraly position on the way from the pipe line to the outlet 4 and communicates with the pipe line trough an injection opening 5. When the injection liquid to solidify the ground is supplied through the pipe line by use of the injection tube 1 and simultaneously inject it from the injection outlets into the ground, after the injection liquid from the pipe line is injected into the liquid chamber 6 through the injection opening 5, the injection liquid is supplied to the outlets 4 and injected into the ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a specific injection pipe having a plurality of injection ports at different axial positions to simultaneously inject a soil consolidation injection solution into the ground through the plurality of injection ports. Regarding the injection method and the injection pipe used in this method, in particular, in spite of changes in ground conditions, the injection liquid is simultaneously discharged from the plurality of injection ports and at a predetermined discharge amount,
At the same time as injecting and infiltrating into the specified injection target ground, it does not destroy the soil particle structure of the injection target ground and allows it to infiltrate homogeneously, thereby perfecting the consolidation effect and solidifying the ground very quickly and easily. The present invention relates to a ground injection method and injection pipe that can be bonded.

[0002]

2. Description of the Related Art As a technique for improving a complicated ground, usually, a single pipe rod injection method is used in which an injection material is injected into the ground from an injection port at a predetermined position of an injection pipe rod while the injection stage is pulled up. Strainer injection method using a strainer tube with a large number of discharge holes on the side wall of the tube, using a double tube, first of all, grout with a short consolidation time is injected into the ground to rough, weak, Alternatively, a so-called composite pouring method or the like is used in which the space around the pouring pipe is filled, and then grout having a long setting time is injected between the soil particles to permeate into the ground.

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

[0004]

The above-mentioned single pipe rod injection method has a drawback that the injection liquid deviates through a rough portion in the ground, and the strainer injection method also has a drawback of permeable property. The discharge holes located near the bad soil layer are likely to be clogged, and only the discharge holes located in the highly permeable soil layer survive and the injection liquid is injected only from this discharge hole.

As a means for improving the drawbacks of this strainer injection method, the injection pipe shown in FIG. 16 is used. Fig. 16
Of the injection pipe 1 has the pipe lines 2a and 2b and the side wall 3
Is provided with an inlet 4, and the inlet 4 has conduits 2a, 2
The injection ports 5 and 5 communicating with b are provided respectively.

In the injection pipe of FIG. 16 having such a structure, the injection liquids, for example, the liquids A and B are respectively supplied to the conduit 2
Liquid is sent through a and 2b, injected from the injection ports 5 and 5 to the injection port 4, respectively, and merged, and then injected from the injection port 4 into the ground. However, since the method using the injection pipe 1 is to inject the injection liquid at a high pressure from the injection port 4 and forcibly inject a predetermined discharge amount into the ground, the soil particle structure of the ground is destroyed by the high-pressure injection. As a result, homogeneous infiltration between soil particles becomes impossible.

Further, in the above-mentioned composite injection method using a double pipe, grouts having different setting times are separately injected, so that it is necessary to switch these grouts during injection, which complicates the operation. Quick and easy injection is not possible. Furthermore, this injection pipe cannot increase the amount of liquid to be sent, resulting in low construction efficiency.

Further, in the above-mentioned composite injection method using a triple tube, it is possible to simultaneously inject grout with different consolidation times, but since it is a triple tube, the injection tube hole diameter is large and the drilling cost is high. Moreover, the construction efficiency becomes poor. Further, this method is complicated because it requires adjustment of the composition of the main material, the reaction mixture composition for flash setting and the reaction composition composition for slow setting.

Usually, the ground to which the pouring method is applied is a soft ground, but in this ground, it is customary that layers having different water permeability are piled up in the horizontal direction in the process of ground formation. Therefore, the injectable liquid easily penetrates along the horizontal permeable layer, but it hardly penetrates into the small permeable layer between them,
Therefore, it is extremely difficult to uniformly consolidate the ground to be injected.

Therefore, an object of the present invention is to use a specific injection pipe having a plurality of injection ports at different positions in the axial direction so that the injection liquid can be simultaneously discharged from the plurality of injection ports regardless of changes in ground conditions. At the same time, it is allowed to infiltrate and infiltrate into the target soil to be injected with a prescribed discharge amount, and at the same time, it is allowed to permeate homogeneously without destroying the soil particle structure of the soil to be injected, which completes the consolidation effect and is extremely quick. Further, it is an object of the present invention to provide a ground injection method and an injection pipe used for this method, which can easily consolidate the ground and have improved the above-mentioned drawbacks existing in the known art.

[0011]

In order to achieve the above-mentioned object, according to the ground pouring method of the present invention, at least one conduit is provided and is communicated with the conduit at different axial positions. When using an injection pipe having a plurality of injection ports to feed the soil consolidation injection liquid through the conduit, when simultaneously injecting into the ground from the plurality of injection ports, at least one injection port, the pipe The injection liquid from the passage is injected into the liquid chamber through the injection port, then is sent to the injection port and injected into the ground.

Further, in order to achieve the above object, according to the injection pipe of the present invention, at least one pipe line is provided, and a plurality of injection ports communicating with the pipe line are provided at different axial positions. , An injection pipe for feeding a ground consolidation injection liquid through the conduit, and simultaneously injecting into the ground from the plurality of inlets, wherein at least one of the plurality of inlets is provided from the conduit. A liquid chamber is provided at an arbitrary position on the way to the inlet, and the liquid chamber and the pipe line are connected by an injection port.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings. 1 and 2 are cross-sectional views of a specific example of the injection tube according to the present invention. First, referring to FIG. 1 in detail, 1 is an injection tube. The injection pipe 1 has one conduit 2a, and has a plurality of injection ports 4, 4 ... 4 at different axial positions, that is, at different positions on the side wall 3.

The inlets 4, 4 ... 4 communicate with the conduit 2a through the outlets 5, 5 ... 5, respectively.
At least one of these inlets 4 has a conduit 2
A liquid chamber 6 is provided at an arbitrary position on the way from a to the injection port 4, and the liquid chamber 6 and the conduit 2a are connected by the injection port 5. 7 is a sleeve.

In the present invention, the injection pipe 1 shown in FIG. 1 is used,
The ground consolidating injecting liquid is pressure-fed through the pipe line 2a, is ejected from the ejection port 5 into the liquid chamber 6, and is then fed to the injecting ports 4, 4 ... 4, and the sleeve 7 is pushed open to make a plurality of injections. Entrance 4, 4
… Injected into the ground from 4 at the same time.

At this time, as will be described later, the injection liquid is injected into the liquid chamber 6 in an amount according to the pressure inside the pipe and the size of the injection port, even if there is a difference in permeation resistance outside the injection pipe 1, and thereafter,
The sleeve 7 is pushed open from the liquid chamber 6 and injected into the ground through the inlet 4 at normal pressure. Therefore, the injection liquid is uniformly injected into the ground without destroying the structure of the soil particles, and despite the change of the ground conditions, the injection liquids 4, 4
4 from the same time and with a predetermined discharge amount, is injected and penetrated into a predetermined ground to be injected.

The injection pipe 1 of FIG. 2 has a structure in which a pipe line 2b is added to the upper portion of the injection pipe 1 of FIG. 1 and the pipe line 2b is directly communicated with an injection port 4a having no liquid chamber 6. In this case, when the injection liquid having a long gelation time is sent to the pipe line 2b and the composition for instantaneous setting is sent to the pipe line 2b, the injection time of the gelation time is increased from the injection port 5 through the pipe line 2a at the injection port 4a. The long injection liquid is jetted, and the mixed solution for instantaneous setting is discharged through the conduit 2b. Both solutions are combined and mixed to be injected as instantaneous connection grout into the ground through the injection port 4a, and the injection ports 4, 4 … 4
Then, the injection liquid having a long gelation time is injected from the injections 5, 5, ... 5 into the liquid chamber 6 through the pipe 2a, and the sleeves 7, 7 ,.
Is opened and is simultaneously injected into the ground from the inlets 4, 4, ... 4 as permeable grout. That is, in the injection pipe of FIG. 2, it is possible to inject instantaneous grout from above to form a packer, and at the same time, inject permeable grout from below to infiltrate soil particles. In addition, at the injection port 4a, it is not necessary to particularly discharge the mixed solution for instantaneous coupling from the conduit 2b by pressurizing.

The tip device 8 is attached to the lower end of the injection tube of FIGS. 3 and 1 and 2. For example, as shown in FIG.
First, the tip device 8 of No. 1 is attached in the state of FIG. 3 (a), and after being inserted into the ground while watering from the pipe line 2a through the pipe line 9, as shown in FIG. 3 (b), the tip device 8 is attached to the pipe line 2a. The ball valve 10 is dropped to close the pipeline 2a, and the pipeline 2 of FIG.
The injection liquid is sent to a.

4 to 5 are sectional views showing another injection pipe of the present invention, FIG. 4 is a hole drilling state, and FIG. 5 is an injection state. This injection pipe 1 has two pipe lines 2
a, 2b, and different axial positions, ie,
A plurality of inlets 4, 4, ... 4 are provided at different positions on the side wall 3. A valve 11 that is vertically slidable by the hydraulic pressure of the liquid injected from the conduit 2a is fitted between these conduits 2a and 2b. The valve 11 has a liquid chamber 6, and the liquid chamber 6 has an injection port 5, which communicates with the conduits 2a, 2b,
5 are provided. One of these injection ports 5 and 5 has a conduit 2a.
4 and when the valve 11 is located above, the other is cut off from the conduit 2b, as shown in FIG. 4, and when the valve 11 is located below, as shown in FIG. Through the pipe line 2b. In the figure, 13 is a valve, 14 is a hole, 15 is a passage, and 16 is a hole.

The valve 11 of the injection pipe shown in FIGS. 4 and 5, that is, the liquid chamber 6 is provided with at least one of a plurality of injection ports 4, 4, ... It is provided at a point on the way to communicating with 4.

Using such an injection pipe, first, as shown in FIG. 4, drilling water is sent through the pipe line 2b to carry out drilling, and then, as shown in FIG. The injection liquids composed of the liquids A and B are respectively sent through 2b. Then, as shown in FIG.
11 are pushed downward, and the valve 13 at the lower end is also pushed downward to close the pipe line 2b, and the liquid is injected into the liquid chamber 6 through the injection ports 5, 5, ...
The liquid A in the conduit 2b is jetted into the liquid chamber 6 through the hole 12 and the jet port 5. Here, the AB liquids are combined and mixed, and then the passage
Liquid is delivered to the injection port 4 through 15 and the hole 14 or through the hole 16, and the rubber sleeves 7, 7, ... 7 are pushed open to be simultaneously injected into the ground.

In this case, in the liquid chamber 6, a predetermined amount of injecting liquid corresponding to the internal pressure of the pipe lines 2a and 2b and the hole areas of the injection ports 5 and 5 is permeable to the ground outside the injecting pipe 1. Regardless of differences or changes, the solution is sent to form a predetermined grout and then injected into the ground.

Therefore, in the present invention, the pipelines 2a, 2b are
So that the ratio of the injection amount from
5 is changed, or the number of injection ports 5, 5 ... 5 is changed, it is possible to simultaneously inject the injection liquid having a changed gelation time into the ground through the injection ports 4, 4, 4. For example, it is possible to selectively inject a quick-grouting grout from the upper injection port 4 and an osmotic grout from the lower injection port 4, or an injection solution in which the gelation time alternates from the upper injection port to the lower injection port. Can be injected simultaneously. Moreover, since the injection ports 4, 4, ... 4 are provided at locations from the pipe lines 2a, 2b to the liquid chamber 6, even though the internal pressure of the pipe lines 2a, 2b is high, the injection ports 4, 4, ... The injection liquid is injected into the ground at low pressure. Therefore, the injection liquid can be injected without destroying the structure of the soil particles.

FIGS. 6-7 show cross-sectional views of yet another injection tube of the present invention, which is exactly the same as FIGS. 4-5 except that the valve 11 has a hole 16 and is shown in FIG. The detailed description is omitted because the injection pipes shown in FIGS. 4 to 5 are exactly the same except that the injection liquid mixed and mixed in the liquid chamber 6 is sent to the injection port 4 through the hole 16. To do.

FIG. 8 is a sectional view of still another injection tube of the present invention. This injection pipe 1 has two pipe lines 2a, 2 as described above.
b, and at different axial positions, that is, the side wall 3
Has a plurality of inlets 4, 4, ... 4 at different positions, and these are connected to the inlet 4 from the conduits 2a, 2b in at least one inlet 4 of the inlets 4, 4, 4. The liquid chamber 6 is provided at an arbitrary position on the way, and both the liquid chamber 6 and the pipe lines 2a and 2b are respectively provided with the injection port 5,
It differs from the above in that it is connected by 5.

FIG. 9 is also a cross-sectional view of another injection pipe of the present invention, which has two conduits 2a and 2b and is located at different axial positions, that is, at different positions of the side wall 3. A plurality of inlets 4, 4, ... 4, which communicate with both of the two conduits 2a, 2b, are provided. In particular, the two conduits 2a, 2
A liquid chamber 6 is provided at an arbitrary position on the way from b to at least one inlet 4, that is, a middle position between the pipes 2a and 2b, and the liquid chamber 6 and the two pipes 2a,
2b are respectively communicated with the injection ports 5 and 5.

In the present invention, using the injection pipe of FIG. 9 as described above, liquid A and liquid B are sent through two pipe lines 2a and 2b,
Both of these liquids are sprayed from the spray ports 5 and 5 to the liquid chamber 6, and after joining, the rubber sleeve 7 is pushed open to send the liquid to the injection port 4 and simultaneously injected into the ground.

FIG. 10 is a cross-sectional view of still another injection pipe of the present invention, which is similar to FIG. 2, and shows a mode in which the instantaneous setting grout is injected from the upper injection port and the permeable grout is injected from the lower discharge port. Is. The injection pipe 1 has two pipe lines 2a and 2b, and these two pipe lines 2 are provided at different axial positions.
Inlet (I) at an upper position communicating with a and 2b, respectively.
4 and an inlet (II) 4 at a lower position, which communicates only with the conduit 2b. In particular, the liquid chamber 6 is provided at an arbitrary position on the way from the two conduits 2a, 2b to the upper inlet (I) 4, that is, an intermediate position between the conduits 2a, 2b, and the liquid chamber 6 is provided. The tip of the conduit 2a is connected to the chamber 6, and the conduit 2b and the liquid chamber 6 are communicated with each other by the injection port 5. Furthermore, the inlet (II) below the pipe line 2b
The liquid chamber 6 is also provided at an arbitrary position on the way to communicate with the liquid chamber 4, and the liquid chamber 6 and the conduit 2b are communicated with each other through the injection port 5.

In the present invention, such an injection pipe as shown in FIG. 10 is used to feed the permeable grout as the liquid A from the conduit 2b and the instantaneous curing agent as the liquid B from the conduit 2a, respectively. The liquid is jetted from the jet port 5 to the liquid chamber 6, and B
The liquid is also introduced into the liquid chamber 6, the AB liquid is merged in the liquid chamber 6, the rubber sleeve 7 is pushed open, and it is injected into the ground from the upper inlet (I) 4 as a quick-grouting grout, and at the same time, Pipeline 2
After injecting the liquid A from the injection port 5 into the liquid chamber 6 through b, the rubber sleeve 7 is pushed open to feed the liquid to the lower injection port (II) 4, and is injected into the ground as a permeable grout.

In the above-mentioned various injection tubes according to the present invention, the injection liquid may be injected by closing the lower end with the tip structure shown in FIGS. 4 to 7, or, although not shown, a cone may be provided at the tip. Even if you attach and place it in the ground,
Alternatively, the casing can be dug and then inserted into the ground, or the tip device shown in FIG. 3 can be attached to the tip of the injection pipe and inserted into the ground while spraying water in the state shown in FIG. 3 (a). Then, as shown in FIG.
For example, the ball valve 10 may be dropped into the pipe line 2a, the pipe line may be sealed, and then the injection liquid may be sent.

In addition, in each of the above-described various injection pipes of the present invention, the injection port 5 is formed with a narrowed diameter. The squeezing of the caliber is performed to such an extent that the injection liquid from the injection port 5 produces a pressure with respect to the flow rate in the injection pipe in the above-ground portion, that is, to the extent that the injection liquid is injected at a certain speed. This injection pressure is 1 kgf / cm ² or more, preferably 10 kgf / cm ² or more,
More preferably, it is 15 kgf / cm ² or more. The diameter of this injection port is about 1.0 mm to 1.5 mm, and one or any plural number may be provided for one liquid chamber.

The ground consolidating injectable solution used in the present invention is water glass or an injecting solution capable of consolidating itself, and examples thereof include a mixed solution of water glass and a reactant, a non-alkaline water glass grout, and a cement grout. Further, the reaction agent is various caking agents or caking accelerators, for the mixed solution of water glass and the reaction agent, salt, alkali such as lime, non-alkaline water glass compounded solution, carbon dioxide gas, Examples of the non-alkaline water glass grout such as carbonated water include water glass, cement, various salts of alkali, water glass grout and the like, and water glass, various salts of the cement grout, non-alkaline water glass compounding liquid and the like.

FIG. 11 shows an application example in which a plurality of injection pipes according to the present invention are used. As shown in FIG. 11, a plurality of injection pipes 1 of the present invention are installed on a predetermined injection target ground X, and Liquids A and B are simultaneously sent to the injection pipe 1 via the pumps P1 and P2, and the ground X is injected and solidified. In this case, the construction efficiency is immeasurably improved.

[0034]

[Action]

1. Even if the water permeability of the ground outside the injection pipe is different, or even if gelation progresses during injection and there is a difference in the permeation resistance outside the injection port for each injection port, the pipe internal pressure and the hole diameter of the injection port, It is possible to obtain a predetermined discharge amount corresponding to the number of holes and the area.

2. By changing the confluence ratio of the injection liquid from each pipe into the liquid chamber, it is possible to set a predetermined ratio without changing the injection liquid to be fed into the pipe or changing the composition. It is possible to inject a predetermined amount of the injection liquid having a gelation time of 3 to a predetermined injection position, and therefore, it is possible to extremely efficiently achieve the injection purpose. In particular, it is possible to simultaneously form the function of preventing the grout having a long gelation time from escaping by forming a packer with the grout having a short gelation time and the function of allowing the grout having a long gelation time to penetrate into the ground between particles. It is possible and extremely efficient construction becomes possible.

Here, the injection function by injection in the present invention will be described with reference to FIGS. 12 and 13. When pumping water into a tube with an inner diameter of 4 cm, pump pressure does not occur. 12 and 13 show examples of the results of measuring the injection pressure (pump pressure) and the discharge amount by mounting the tip end portion having the injection port at the end of this pipe. For comparison, the tip of the tube, which has three outlets with a diameter of 1 cm, was attached to the end of the tube.
Although water was delivered up to 20 l / m, almost no discharge pressure was observed.

FIG. 12 shows a nozzle having a nozzle diameter of 1.0 mm, and FIG. 13 has a tip portion having a discharge port of 1.5 mm, which is attached to a pipe, and the pump pressure is changed variously to supply water so that the pump pressure maintains a predetermined pressure. The liquid is also liquefied, and the downstream side of the injection port is also connected 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 is clear from FIGS. 12 and 13, for example, using a pump pressure of 80 kgf / cm ² ,
Even if the resistance pressure (kgf / cm ² ) in the ground changes, the flow rate from the nozzle is constant up to a resistance pressure of 50 kgf / cm ² .

That is, there is a region where a constant discharge amount can be obtained despite the change in the ground resistance pressure.
And it can be seen from FIG. Further, according to the experiment, for example, when injecting at a pump pressure of 30 kgf / cm ² , the injection amount on the ground (when the ground resistance pressure is zero) is approximately 3 l / min when the nozzle diameter is 1.0 mm, and the nozzle diameter is 1. At 5 mm, it is almost 6 l / min. This means that if the number of injection ports is adjusted to double the injection amount, the nozzle diameter of 1.0 mm should be increased to two. To adjust the size of the nozzle, the nozzle diameter of 1. It is sufficient to increase 0 mm to 0.5 mm.

Therefore, even if the injection materials having different setting times are discharged from the respective injection ports, a constant discharge amount can be obtained even if the water permeability of the ground is different, and the ground is surely solidified. You can In other words, the injection material with a short setting time is harder than the injection material with a long setting time, so the injection resistance of the surrounding ground is large, but nevertheless a constant flow rate corresponding to the nozzle diameter is secured. It
In addition, the soil has different water permeability in each of the upper and lower layers, and therefore has different injection resistance, but nevertheless a constant flow rate is secured. Further, although the ground pressure (resistance pressure) changes in the ground due to various causes, a constant flow rate is always ensured nevertheless. Therefore, according to the injection pipe of the present invention, the pump pressure can be selected to a desired value. As a result, a constant discharge amount is secured, and the ground is reliably solidified.

[0040]

As described above, according to the present invention, by using a specific injection pipe having a plurality of injection ports at different positions in the axial direction, the plurality of injection liquids can be supplied in spite of a change in ground conditions. At the same time from the injection port of and at a predetermined discharge amount, it is allowed to infiltrate and infiltrate into the prescribed target soil, and at the same time, it is allowed to permeate homogeneously without destroying the soil particle structure of the target soil. (EN) A ground injection method that can be solidified and can be solidified very quickly and easily, and an injection pipe used in this method.

[Brief description of drawings]

FIG. 1 is a sectional view of a specific example of an injection tube according to the present invention.

FIG. 2 is a sectional view of a specific example of another injection tube according to the present invention.

3A and 3B are cross-sectional views of a specific example of the tip device used for the injection tube of the present invention, in which FIG. 3A shows a drilled state and FIG.

FIG. 4 is a cross-sectional view of yet another specific example of the injection pipe of the present invention, showing a drilled state.

5 shows an injection state of the injection tube of FIG.

FIG. 6 is a cross-sectional view of yet another specific example of the injection pipe of the present invention, showing a drilled state.

FIG. 7 shows an injection state of the injection tube of FIG.

FIG. 8 is a cross-sectional view of yet another embodiment of the injection tube of the present invention.

FIG. 9 is a cross-sectional view of still another embodiment of the injection tube of the present invention.

FIG. 10 is a cross-sectional view of yet another embodiment of the injection tube of the present invention.

FIG. 11 is an application example of the ground pouring method according to the present invention using the pouring pipe of the present invention.

[Fig.12] Resistance pressure (kgf /
3 is a graph showing the relationship between cm ² ) and the flow rate from a nozzle (l / min).

[Fig. 13] Resistance pressure (kgf /
3 is a graph showing the relationship between cm ² ) and the flow rate from a nozzle (l / min).

FIG. 14 is a cross-sectional view of a known injection tube.

[Explanation of symbols]

 1 Injection pipe 2a Pipe line 2b Pipe line 3 Side wall 4 Injection port 5 Injection port 6 Liquid chamber 7 Rubber sleeve 8 Tip device 11 Valve 13 Valve

Claims (6)

[Claims] 1. An injection pipe having at least one pipe line and having a plurality of injection ports communicating with the pipe line at different positions in the axial direction is used, and the injection liquid for soil consolidation is passed through the pipe line. At the time of delivering the liquid and simultaneously injecting into the ground from the plurality of injection ports, at least one of the injection ports, after injecting the injection liquid from the conduit into the liquid chamber through the injection port, then delivering the solution to the injection port. Ground injection method characterized by injecting into the ground. 2. An injection pipe having two pipe lines and having a plurality of injection ports respectively communicating with the two pipe lines at different positions in the axial direction, and the injection liquid is passed through the two pipe lines. The liquid is sent, and after merging, when simultaneously injecting into the ground from the plurality of injection ports, at least one injection port, injecting the injection liquid from the two pipes into the liquid chamber through the injection ports, respectively, 2. The ground pouring method according to claim 1, wherein after the confluence, the liquid is sent to the pouring port and the liquid is poured into the ground. 3. An injection port (I) having two conduits and communicating with the two conduits at different axial positions, and one conduit of the two conduits. An injection tube having an injection port (II) communicating with each other is used, and the permeable grout and B as the liquid A are passed through the two conduits.
After sending the curing agent for flashing as a liquid and joining them,
It is injected into the ground as an instantaneous grout from the injection port (I), and the solution A is injected into the ground at the same time as the injection from the injection port (I) as the permeable grout from the injection port (II). At this time, in at least one of the injection ports (I), the liquid A or the liquid B from the at least one conduit is injected into the liquid chamber through the injection port, and the liquid AB is merged, and then the injection port (I). ) To inject into the ground, and in at least one of the injection ports (II), after injecting the liquid A into the liquid chamber through the injection port, the solution is sent to the injection port (II).
The ground injection method according to claim 1, wherein the ground injection method is carried out. 4. At least one pipe line is provided, and a plurality of injection ports communicating with the pipe lines are provided at different positions in the axial direction, and the ground consolidation injection liquid is sent through the pipe lines. An injection pipe for simultaneously injecting into the ground from the plurality of injection ports, wherein a liquid chamber is provided at an arbitrary position on the way from the conduit to at least one injection port of the plurality of injection ports. An injection pipe in which the liquid chamber and the pipe line communicate with each other through an injection port. 5. An injection pipe having two pipe lines and having a plurality of injection ports respectively communicating with the two pipe lines at different axial positions, wherein the two pipe lines include: A liquid chamber is provided at an arbitrary position on the way to communicate with at least one of the plurality of inlets, and the liquid chamber and the two pipelines are respectively communicated with each other through an outlet. 4 injection tubes. 6. An injection port (I) having two pipelines and communicating with the two pipelines at different axial positions, and one pipeline of the two pipelines. An injection pipe having an injecting port (II) communicating therewith, wherein a liquid chamber is provided at an arbitrary position on the way from the two pipelines to at least one of the injecting ports (I). The liquid chamber and at least one of the pipes are connected by an injection port, and a liquid chamber is provided at an arbitrary position on the way from the one pipe to at least one of the injection ports (II). The injection pipe according to claim 4, wherein the liquid chamber and the pipe line are connected to each other by an injection port.