JPS58117124A - Injection pipe and flow path change thereof - Google Patents

Abstract

PURPOSE:To prevent the adherence of gel substances to an injection pipe by a method in which an expandible bag is provided at the entrance of the tip of an inner tube and also at the entrance of the lower part of an outer tube and the entrances are closed by the expandible bag to change the flow path. CONSTITUTION:An expandible bag 4 is attached to the entrance 3 of an inner tube, and the other entrance 7 is covered with a rubber sleeve 8. Also, a lower discharge port 5 is provided at the tip portion lower than the expandible bag 4 of the outer tube 2, and an upper discharge port 6 and a check valve 9 are provided above the lower discharge port 5. Water glass aqueous solution or a mixture of water glass and a reacting agent is sent from the flow path 2a of the outer tube 2 and at the same time a reacting agent aqueous solution is sent from the flow path of the inner tube 1, whereupon the bag 4 is expanded to block the path 2a of the outer tube 2. Furthermore, the reacting aqueous solution coming from the discharge port 7 expands the sleeve 8, is jetted toward the outside of the outer tube 2 through the discharge port 6, and then injected into the ground. In short, the flow path is changed from the lower discharge port 5 to the upper discharge port 6.

Description

[Detailed description of the invention] Regarding the method.

In recent years, injection pipes with multiple channels have been used to pump multiple fluids into the ground, where they join together and solidify.
The ground injection method, which consolidates the ground through this method, has been widely adopted.

To give an example, this method uses an injection pipe with a plurality of flow paths, first, the polling water is sent to the injection pipe to drill an injection hole in the ground, and then the plurality of injection pipes are A plurality of injection materials are sent separately through the channel, and these are combined and injected into the ground from the outlet on the side wall of the injection pipe as instant setting grout, or they can be combined outside the injection pipe. This is a so-called composite injection method in which grout is injected into the ground separately from the outlet, and then permeable grout is injected from the outlet at the bottom of the injection pipe.
The injection pipe needs to have a flow path conversion function.

Conventionally, the flow path conversion in the injection tube has been performed by manipulating the pulp by springing a spring, but this flow path conversion has the disadvantage that gelled substances adhere to the spring, making the pulp inoperable. was.

In order to improve the drawbacks of the above-mentioned known techniques, the inventor of the present invention, as a result of intensive research, attached an elastic bag to the discharge port of the inner tube of the injection tube, and applied the expansion or contraction effect of the elastic bag due to changes in fluid pressure. The present invention has been developed by improving the drawbacks of the above-mentioned known techniques.

An object of the present invention is to provide an injection tube that can freely change the flow path without being fixed by a gelled material, and a method for changing the flow path of this injection tube.

In order to achieve the above object, the injection tube of the present invention includes at least an inner tube and an outer tube, the inner tube has at least one outlet, and at least one of the outlets is injected by an elastic bag. The outer tube is closed, and the outer tube has a discharge port at least at the same height as the elastic bag or at a position lower than this, thereby facilitating flow path conversion within the tube, and further as described above. In order to achieve the above object, the method of the present invention includes at least an inner tube and an outer tube, the inner tube has at least a discharge port closed by an elastic bag, and the outer tube has at least an elastic bag. Using an injection tube that has a discharge port at the same level or at a position lower than this, fluid is sent into the inner tube to which the elastic bag described below is attached, and the elastic bag is inflated with this fluid, and this inflation The flow path in the injection tube adjacent to the inner tube is closed by the elastic bag, or the flow path in the injection tube is unblocked by stopping the supply of fluid to the inner tube, thereby closing the flow path in the injection tube. Convert freely! : Features:

Hereinafter, the present invention will be explained in detail using the accompanying drawings.

1 to 16 are specific examples of the injection tube according to the present invention, and among these, FIGS. 1 to 9 are specific examples in which a double pipe is used as the injection tube. , FIG. 10 to FIG. 16 are examples of triple tubes.

First, referring to FIG. 1, 1 is an inner tube, 1a is a flow path of the inner tube 1, 2 is an outer tube, and 2a is a flow path of the outer tube 2. The injection tube in this example is composed of an inner tube 1 and an outer tube 2, and a stretchable bag 4, for example a rubber bag, is attached to a discharge port 3 of the inner tube 1 so as to close the discharge port 3. Furthermore, the inner tube 1 has another discharge lower in addition to the above-mentioned discharge port 3, and this discharge lower is covered with a rubber sleeve 8. Also,
The outer tube 2 has a lower discharge port 5 at its lower tip than the elastic bag 4.
and has an upper discharge port 6 at a position above the elastic bag 4. As shown in (c), a check valve 9 is mounted by being connected to the opposing discharge port 6 by a spring 10. In addition, in FIG. 1, 11 is a rubber umbrella check valve, and 12 is a metal crown.

When installing the injection pipe constructed in this way, the first
As shown in Figure (a), drilling water is fed through the channel 2a of the outer pipe 2 to drill holes in the ground.

Next, a water glass aqueous solution or a mixed solution of water glass and a reactant is fed through the channel 2a of the outer tube 2, and then a reactant aqueous solution is fed through the channel 1 of the inner tube 1. The bag 4 expands due to the pressure and closes the flow path 2a of the outer tube 2, and the reactant aqueous solution pushes out the rubber sleeve 8 from the discharge lower of the inner tube 1 and is ejected into the flow path 2a to form the water glass aqueous solution. Alternatively, the mixed liquid is mixed with a mixed liquid of water glass and a reactant, and the mixed liquid is sprayed out of the outer pipe 2 through the upper discharge port 6 of the outer pipe, pushing the check valve 9 outward under the discharge pressure, and spraying it out of the outer pipe 2. injected inside.

(FIG. 1(b)) In other words, the fluid passing through the flow path 2a is converted from the lower discharge port 5 to the upper discharge port 6.

Another construction example will be shown using FIG. That is,
A blended solution having a long gelation time, which is a mixture of water glass and a reactant, is fed through the channel 2a of the outer tube 2, and the channel 1 of the inner tube 1
Send the quick-setting agent from a. These two liquids are mixed in the pipe line 2a of the outer tube 2 to form a liquid mixture with a short gelation time, as described above, and this liquid mixture is passed from the upper discharge port 6 of the outer tube 2 to the check valve 9. The liquid is spread out and injected into the ground, filling the voids in the injection pipe roll and filling the surrounding rough or weak areas.Then, the delivery of the quick-setting agent from the inner pipe 1 is stopped. Then, the elastic bag 4 expands.
(The flow path 2a is untied and closed, and therefore the flow path 2a
The mixed liquid having a long gelation time fed into i is converted into a flow path from the upper discharge port 6 of the outer tube 2 to the lower discharge port 5,
It is injected into the ground from the lower discharge port 5. The injected mixture with a long gelling time has already been filled and solidified into the rough or weak parts of the voids, so it does not deviate to the ground surface and causes soil particles to open around it quickly. Penetrates and solidifies the ground homogeneously.

FIG. 2 shows an example of an injection tube in which the fluid flowing through the inner tube 1 is directly jetted out of the outer tube 2. The operation is the same as for the injection tube in FIG. In this case, the reactant is ejected from the discharge lower of the inner tube 1, water glass or a mixed liquid of water glass and the reactant is ejected from the outlet 6 of the outer tube 2, and both liquids are combined on the outside of the injection tube. Therefore, even if the gelation time of the combined liquid is very short, there is no need to worry about gel clogging in the tube. In this injection tube as well, the flow path of the fluid flowing into the outer tube 2 can be changed freely, similar to the one in FIG. That is, in FIG. 2a), the fluid flowing into the outer tube 2 flows in the direction of the lower discharge port 5, but the fluid is fed into the inner tube 1 to inflate the elastic bag 4 and open the flow path 2a.
By closing with this bag 4, the flow path of the outer tube 2 can be converted to the direction of the upper discharge port 6. (FIG. 2(b)) o Furthermore, by stopping the supply of the fluid 1 to the inner tube 1, the flow path can be easily converted to the state shown in FIG. 2(a) again. The discharge lower of the inner pipe 1 is shown in Figure 2 (a).
), that is, as shown in FIG. Check valve 8a
is connected to a check valve 8a located opposite to it by a spring 10a. The injection pipe shown in FIG. 3 is basically the same as the injection pipe shown in FIG. 5, the lower side wall is also provided with lower discharge ports 5a, 5b, check valves 9a, 9b are attached to these lower discharge ports 5a, 5b, and the elastic bag 4 is connected to the lower discharge ports 5a, 5b. 5b, and differs from the injection tube shown in FIG. 1 in that a space is formed within the outer tube at the bottom of the elastic bag 4.

An example of the construction process for this type of injection pipe is as follows.

First, as shown in FIG. 3(a), water is introduced through the channel 2a to poll the ground, and an injection pipe is inserted at a predetermined depth. Water is ejected from the lower discharge port 5, and then the water supply is stopped and the ball valve 13 is dropped into the flow path 2a, and the lower discharge port 5 is closed by this ball pulp 13. (Figure 3(b)).

Next, when a fluid containing a reactant is introduced from the channel 1a and a fluid containing water glass and a reactant is introduced from the channel 2a, the elastic bag 4 expands due to the fluid pressure and the outer tube 2 The flow path 2a is slightly closed, and the lower discharge port 5.5a is opened by closing the flow path 2a.
, 5b and the upper discharge port 6 are separated, and the fluid from the flow path 1a pushes out the rubber sleeve 8 from the inner pipe discharge lower and flows into the flow path 2a of the outer pipe 2, where it flows into the flow path 2a.
The fluid containing the water glass and the reactant mixed with the reactant spouted from the discharge lower of the inner tube mixes, and the mixed liquid pushes open the check valve 9 from the upper discharge port 6 of the outer tube and exits the injection tube. It is discharged and injected into the ground, solidifying the void around the injection pipe and the surrounding ground. (Figure 3 (C)).

Next, when the feeding of the fluid containing the reactant from the flow path 1a is stopped and the mixed liquid containing water glass and the reactant that has a long gelation time is fed from the flow path 22, this mixed liquid is transferred to the lower part of the outer tube 2. It is injected into the ground through the discharge ports 5a and 5b. (Figure 3 (
d)). At this time, since the upper ground area has already been consolidated by the mixed liquid injected from the upper discharge port 6, the mixed liquid uniformly permeates and solidifies between the soil particles without deviating upward. In addition, in FIG. 3, the check valve 9 of the upper discharge port 6 of the outer tube is connected to the check valve 9 by a spring as shown in the AA sectional view of FIG. 3(a), that is, as shown in FIG. 3(e). The stopper piece 32 is connected via the stopper 10b, and the stopper piece 32 is attached to the inner wall of the outer tube so that the upper discharge port 6 is opened when the fluid pressure in the flow path 2a increases.

In addition, in the injection pipe shown in FIG. 3, the injection of the ball pulp 13 is omitted, and the grout with a long gelation time is poured into the lower discharge port 5.
, 5s, and 5b can be injected into the ground. This also applies to the examples shown in FIGS. 4, 5, and 6 using ball pulp, which will be described later.

As described above, in the injection tube shown in FIG. It can be easily and freely converted by simply expanding or contracting it.

FIG. 4 shows that the fluid flowing through the flow path 12 of the inner tube 1 is directly ejected from the inner tube discharge lower by pushing open the check valve 8a to the outside of the outer tube 1, and the fluid in the outer tube 2 and the outside of the outer tube are This is an example of mixing,
The rest is completely the same as in FIG. 3.

Fig. 5 shows that the elastic bag 4 is installed at the same height as the lower outlet ports 5a and 5b, and when it expands, it blocks not only the lower outlet ports 5a and 5b but also the lower outlet port 5. ,
The structure is the same as in Fig. 3 except that no space is formed at the bottom of the elastic bag 4. When constructing this type of injection pipe, first, water is introduced from the channel 2a, and this water is is injected from the lower discharge port 5 to poll the ground, and the injection pipe is inserted to a predetermined depth (FIG. 5(a)).

Next, when the water supply is stopped and the ball valve 13 is dropped from the upper part of the injection pipe into the flow path 2a, this ball pulp 13
0 that blocks the discharge port 5 at the end of the outer tube (Fig. 5(b))
.

Furthermore, when a fluid consisting of a reactant is introduced into the channel 1a,
The fluid expands the elastic bag 4 and closes the entire space from the lower discharge ports 5a and 5b of the outer tube 2 to the lower discharge port 5, and the fluid in the inner tube is discharged from the inner tube discharge lower into the outer tube. do. At the same time, when water glass or a fluid containing water glass and a reactant is fed from the flow path 2a, this fluid mixes with the reactant spouted from the inner tube discharge lower in the flow path 2a, and the mixed liquid is transferred to the upper part of the outer tube. It is discharged from the discharge port 6 to the outside of the injection pipe (by changing the flow path) and injected into the ground, solidifying the void around the injection pipe and the surrounding ground. (Figure 5(C)).

Next, the supply of the fluid containing the reactant from the channel 1a is completely stopped,
When only the mixed liquid containing water glass and the reactant is sent from the flow path 2a, the elastic bag 4 contracts, and the mixed liquid is converted into a flow path and flows through the outer tube lower discharge ports 5a and 5b to the surrounding ground. Injected. (Figure 5(d)).

Next, the injection tube is pulled up to orient the stage upward and the process is repeated. In addition, for the injection tube shown in Fig. 3, the injection tube shown in Fig. 3 (C
In step 1, the mixed liquid accumulates at the bottom of the flow path 2a, but in the injection tube shown in FIG. Since the liquid is discharged from the outer tube through the outlet 5, even if sufficient time is taken to inject it from the upper discharge port 6 in the process shown in FIG. 5(c), the blended liquid will gel at the bottom of the outer tube. and then the fifth
In the process shown in FIG. 3(d), no phenomenon occurs in which the mixed liquid of water glass and reactant from the channel 2a is prevented from being discharged from the lower discharge port 5.

Figure 6 is the same as Figure 5 except that the fluid flowing into the flow path 1a of the inner tube 1 is directly ejected outside the outer tube 1, so the explanation will be omitted. Figure 7 shows the inner tube 1 and The inner tube 1 is connected at its tip to the tip of the outer tube 2 and is opened at the tip to form an inner tube outlet 3a, which is closed by an elastic bag 4. The discharge outlet 3 has a discharge port 3, and further has another inner pipe discharge lower, which is equipped with a check valve 8a connected to a spring 10a, and opens and closes according to changes in fluid pressure within the inner pipe 1. . The outer tube 2 has lower discharge ports 5, 5, . This upper discharge port 6 is a slide valve 1
It is opened and closed by vertical displacement of 4. The slide valve 14 has holes 15, 15, 15, . The tube 2a is installed on the inner wall of the outer tube 2 and the outer wall of the inner tube 1 so as to be vertically slidable.

Note that the upper end 4 of the elastic bag 4 is fixed to a metal ring 19.

When constructing this type of injection pipe, first, water is introduced through the channel 1a, this water is ejected from the inner pipe outlet 3a to poll the ground, and the injection pipe is inserted to a predetermined depth. (7th
Figure (a)).

Next, the supply of water is stopped, and the ball pulp 13 is dropped from the upper part of the inner tube 1a of the injection tube into the flow path 1a, and the discharge port 3a of the inner tube is closed by this ball valve 13.

(Figure 7(b)).

Furthermore, when the quick-setting reactant liquid is fed into the flow path 1a, the elastic bag 4 expands due to the flow pressure of this liquid and closes the lower discharge ports 5.5...5 of the outer tube 2, and the inner tube 4 elastic bags
The slide valve 14 is slid upward by the fluid pressure inside, and the upper discharge port 6 is opened.

At the same time, when water glass or a mixed liquid of water glass and a reactant is fed from the flow path 2a, this mixed liquid mixes with the quick-setting reactant spouted from the inner pipe discharge lower in the flow path 2a, and the mixed liquid is It is discharged from the upper discharge port 6 to the outside of the injection pipe and injected into the ground, solidifying the void around the injection pipe and the surrounding ground.

(Figure 7(C)).

Next, when the supply of the quick-setting reactant liquid from the channel 1a is stopped, the elastic bag 4 contracts, and the slide valve 14 slides downward to close the upper discharge port 6. In this state, flow path 2
When the mixed liquid of water glass and reactant is sent from a, the flow path 2a of the outer tube is changed from the upper outlet 6 to the lower outlet 5.5...5, from where it is injected into the surrounding ground. . (Figure 7(d)).

Alternatively, the upper end of the elastic bag 4 may be inserted into contact with one end 14a of the ride valve 14 as shown in FIG. 7(e), and the slide valve 14 may be slid by the expansion and contraction of the bellows. This configuration is preferred because it reduces fluid leakage from the contact surface with the metal ring 19.

FIG. 8 shows the inner tube 1 except that an elastic bag 4 is attached to the discharge port 3 at the tip of the inner tube 1, and another inner tube discharge lower covered with a sleeve 8 is provided at the tip of the elastic bag 4. This is the same as the injection tube in Figure 1.

In constructing this injection pipe, first, water is introduced through the channel 2a, and this water is ejected from the lower discharge port 5 to poll the ground, and the injection pipe is inserted at a predetermined depth. (Figure 8(a)
)).

Next, the water supply is stopped and a fluid consisting of water glass and a reactant is introduced into the channel 1a, and the elastic bag 4 is inflated by the fluid pressure to close the channel 2a and the inner pipe discharge lower. The sleeve 8 is pushed open and the fluid is injected into the ground from the lower discharge port 5. (Figure 8(b)).

Alternatively, a fluid made of a reactant, a fluid made of water glass and a reactant, or a fluid made of water glass is further sent to the flow path 2a, and the check valve 9 is pushed open through the upper discharge port 6 and the fluid is poured into the ground. The process of injecting into the inside is shown in Fig. 8 (
It may be used in combination with the step shown in b). (Figure 8(C)).

In the above-mentioned injection tube shown in FIG. 8, the fluid in the flow path 2a is converted from the lower outlet 5 to the upper outlet 6 or vice versa by the expansion or contraction of the elastic bag 4. etc. can be easily and freely converted.

In FIG. 8(c), while water glass grout, which has a long gelling time, is injected into the ground from the discharge lower of the inner tube 1 through the lower outlet 5 of the outer tube 2, it is quickly set from the upper outlet 6. When the reactant is injected into the ground, the grout that has been rising from below along the injection pipe and has a long gelling time can be quickly set by the quick-setting reactant.

Fig. 9 is equipped with an inner tube 1 and an outer tube 2, an elastic bag 4 is attached to the distal end outlet 3 of the inner tube 1, and the abdomen of the elastic bag 4 of the bracket is covered with a sleeve 8. This injection tube is equipped with a discharge lower, and is equipped with a lower discharge port 57 at the tip of the outer tube 2 and a lower discharge port 5a on the side wall of the outer tube at a position that matches the discharge lower of the inner tube. When constructing the pipe, water is introduced through the square channel 2a for polling, and the injection pipe is inserted at a predetermined depth. (
Figure 9(a)).

Next, water supply is stopped, and a fluid made of water glass or a fluid made of water glass and a reactant is delivered from channel 2a, while a fluid containing a reactant is delivered from channel 1a, and the fluid pressure expands and contracts. The sex bag 4 is inflated to close the flow path 2a, and the discharge lower is driven into the lower discharge port 5a. The fluid in the flow path 2a is injected into the ground from the upper discharge port 6, and the fluid in the flow path 1a is injected into the ground from the lower discharge port 5a. (Figure 9(b)
)).

In such an injection tube, the fluid in the flow path 2a is
Similar to the injection tube shown in the figure, conversion is easy and free.0 Figure 10 is an example of an injection tube consisting of a triple tube, with an inner tube 1,
It is composed of an inner tube 20 and an outer tube 2. A check valve 24 is installed in the hole 21, and a check valve 24 is installed in the hole 22. Note that 20a indicates the flow path of the inner tube hole. This type of injection tube has basically the same structure as the injection tube shown in FIG. 8, except that it is a triple tube.

Figure 10 (al = shows the poling situation, which is the same as described above. Figure 10 (bl) shows that grout, which has a long gelation time, is injected into the entire ground through the inner pipe 1a from the lower discharge port 5, while at the same time the upper A situation is shown in which a grout i having a short gelation time is injected from the discharge port 6 and solidified around the injection pipe and its surroundings.The conversion of the flow path is free and easy as described above.

Figure 11 is also an example of an injection pipe consisting of a triple pipe, with the first
Figure 1 (al and (b) shows flow path 1a and flow path 20, respectively.
(a) A combination of the above-described fluids can be flowed through the channel 2a to accomplish a poling process, a grout injection process with a short gelation time, a grout injection process with a long gelation time, etc. In this injection tube, the fluid from the flow path 20a can be interrupted or interrupted by expanding or contracting the elastic bag 4, thereby changing the combination of fluids, and in the present invention, such a change in the combination of fluids can also be performed. It is included as a path conversion.

FIG. 12 shows a triple injection tube in which an inner tube 5 having a flow path 25a is further provided in the flow path 1a of the inner tube 1 to which the elastic bag 4 is attached. flow path 25
When water glass is fed through a and a quick-setting reactant is fed through the flow path 2a of the outer tube 2, the water glass pushes open the check valve n from the hole 26 and is discharged into the flow path 2a. The water glass and the rapid setting reactant are mixed to form instant setting grout, which is injected into the ground from the lower discharge port 5.

Next, as shown in FIG. 12(b), the flow path 1 of the inner tube 1 is
When the aqueous solution of a reaction agent for loosening (aqueous solution of a reaction agent for penetration) is fed from a, the aqueous solution is introduced into the elastic bag 4 from the discharge port 3, and this elastic bag expands due to the fluid pressure of the aqueous solution to open the flow path. 2a is slightly closed, and at the same time, the aqueous solution is pushed open from the discharge lower through the check valve 8a supported by a spring 10a, and flows into the flow path 2.
a, where the water glass from the inner tube 25 and the inner tube 1
The infiltration reactant from the grout is mixed to form the infiltration grout, which is injected into the ground from the lower outlet 5.

This type of injection tube is similar to the injection tube shown in FIG.
The combination of fluids can be changed by expanding or contracting the fluid.

FIG. 13 also shows an injection tube consisting of a triple tube, in which a stretchable bag 4 having a discharge lower on the abdomen is made up of an inner tube 1 attached to the discharge port 3, an inner tube 28 outside the inner tube 2, and an outer tube 2. configured,
The inner tube 28 has a distal end connected to the distal end of the outer tube 1 and is connected to the flow path 2.
8a, and further has a hole 29 in the lower side wall at a position that matches the discharge lower. Inject water from the mass flow path 2a and perform polling in the same manner as described above (Figure 13(a)).
Next, a fluid containing a reactant is sent through the flow path 1a of the inner tube 1 to inflate the elastic bag 4, thereby inserting the discharge lower into the hole 29 of the inner tube 28 and simultaneously opening the flow path 28 of the inner tube 28.
When the tube a is closed and water glass is fed through the flow path 2a of the outer tube 2, the water glass and the reactant from the inner tube 1 are mixed in the flow path 2a, and this is mixed into the upper discharge port 6 of the outer tube. It is injected into the ground. (Figure 13(b)).

When the supply of fluid to the flow path 1a is stopped, the hole 2 of the inner tube 28
9 is opened, and the water glass from the outer tube flow path 2a and the reactant from the inner tube flow path 28a are combined and injected into the ground from the lower discharge port 5. (Figure 13(C)).

This flow path conversion situation is the same as that described above, so a description thereof will be omitted.

Fig. 14 shows a triple injection tube having two elastic bags; an elastic bag 4a is attached to the discharge port 3a in the upper position of the inner tube 1, and an elastic bag is attached to the discharge port 3b in the lower position. 4b is attached, and a discharge lower opening to the outside of the outer tube 2 is further provided. An inner tube 30 is provided on the outside of the inner tube 1, and an outer tube 2 is further provided on the outside.

FIG. 14(a) shows the state of the poling process. For example, water is introduced through the channel 30a of the inner tube 30 to perform the poling process. Next, as shown in FIG. 14(b), for example, a quick-setting reactant is introduced from the inner tube flow path 1a, and then the rapid setting reaction agent is introduced into the outer tube flow path 2.
When water glass or a mixed solution of water glass and a reactant is introduced from a, the elastic bag 4a expands due to the fluid pressure and closes the inner tube channel 30a, and the elastic bag 4b also expands due to the fluid pressure. Then, it expands and closes the outer pipe flow path 2a, and furthermore, the quick-setting reactant in the inner pipe groove 1a pushes open the check valve 8a supported by the spring 10a and flows from the discharge lower to the outer pipe. Injected outside of 2,
At the same time, the fluid in the outer pipe flow path 2a flows from the upper discharge port 6 to the check valve 9.
is pushed open and injected outside the outer tube 2, and both are merged outside the injection tube to form flash-setting grout.

Next, when the supply of fluid to the inner tube flow path 1a is stopped, the injection tube returns to the state shown in FIG. When the penetrating reactant is fed from the grout, the two join together to form the penetrating grout, which is injected from the lower discharge port 5.

The flow path conversion situation of this injection tube is also the same as described above, so a description thereof will be omitted.

FIG. 15 is the same as the injection tube of FIG. 1I, except that the inner tube 1 has no other outlet than the outlet 3 which is closed by the elastic bag 4.

First, in the state shown in FIG. 15(a), water is introduced from the outer tube flow path 2a, and this water is jetted out from the lower discharge port 5 to perform polling. Next, water or gas is introduced into the inner tube flow path 1a and pressurized, thereby expanding the elastic bag 4 and closing the flow path 20a of the inner tube 20. In this state, water or gas is supplied from the outer tube flow path 2a. A mixed solution of water glass and a reactant, which has a slow gelling time, is introduced and injected into the ground from the lower discharge port 5. (Figure 15 (
b)).

Furthermore, the supply of fluid to the inner tube flow path 1a is stopped to return to the state shown in FIG. Reactants are introduced through the channel 20a, and the combined liquid (grout with a fast gelling time) is injected into the ground through the lower discharge port 5.

The flow path change in this injection tube is performed by changing the combination of fluids as in FIG. 11.

FIG. 16 is the same as the injection tube of FIG. 10, except that the inner tube has no other outlet other than the outlet 3 fitted with an elastic bag.

First, water is introduced from the outer tube flow path 2a in the state shown in FIG. In this state, flow path 2
Water glass and a reactant are introduced through the flow path 20a and the flow path 20a, and the combined liquid is injected into the ground through the upper discharge port 6 of the outer tube 2. (Figure 16(b)).

The flow path in this injection tube can be changed by simply inflating and deflating the elastic bag 4, etc., to convert the fluid from the lower outlet 5 to the upper outlet 6, or vice versa. It is.

Fluids that merge and solidify in the present invention can be classified, for example, as follows.

A: Water glass aqueous solution B: A mixed solution of water glass and a reactant (a liquid mixed in a mixer may be used, or a liquid obtained by combining a water glass aqueous solution and a reactant aqueous solution at an arbitrary point or point) B': Water A mixture of glass and acid whose pH value is in the acidic to neutral range.

C: Cement suspension D: Reactant aqueous solution E: Carbon dioxide The combinations that combine and solidify these fluids are A-C, A-
D, A-E, B-C, B-D.

B-EXC-D etc., especially in the case of B', B'-C, B'-D (alkaline aqueous solution), B'-A, B'-CXB' -(C
and (D)) B'-B (when the pH of the mixture is in the alkaline region).

In the above, especially since carbon dioxide gas is a gas, it can be mixed into A or B and gelled without changing the water glass concentration, and it is extremely strong in terms of high strength, gelling in a short time, and ease of construction. It is excellent.

It is also suitable for inflating the elastic bag of the present invention.

The reactant in the present invention is an acid (
(inorganic acids, organic acids, etc.), salts (inorganic salts, organic salts, basic salts,
Neutral salts, acidic salts, etc.) esters, aldehydes, amides, alcohols, alkalis such as lime, cements, etc. can be used as desired; however, the following example is only an example. Yes, but not limited to these. In addition, as water glass, the molar ratio (5i02/M20)
: 1.5 to 5.0 An alkali metal salt of silicic acid in any molar ratio including liquid water glass, anhydrous water glass, hydrous water glass, crystalline water glass, etc., or an alkali metal salt of silicic acid and silicic acid. A mixture.

[Reactant]

Esters: Fatty acid esters of monohydric alcohols such as ethyl acetate, methyl acetate, butyl acetate, and amyl acetate.

Fatty acid esters of polyhydric alcohols such as ethylene glycol diacetate, glycerine triacetate, and succinic acid diester. (Total ester) Intramolecular ester such as δ-butyrolactone and ε-caprolactone. (Cyclic esters: lactones) Ethylene glycol monoformate, ethylene glycol monoacetate, ethylene glycol monopropionate, glycerin monoformate, glycerin monoacetate, glycerin monopropionate, glycerin digitate, glycerin diformate Ethylene carbonate (ethylene carbonate), propylene carbonate (propylene carbonate), such as acetate ester, sorbitol monoformate ester, sorbitol monoacetate ester, glycolic acid monoacetate ester, low polymerization degree partially saponified vinyl acetate, etc.
Carbonates such as cyclic carbonates such as glyceryl carbonate.

Aldehydes: glyoxal, succinic dialdehyde, malondialdehyde, succinic aldehyde, glutardialdehyde,
・Dialdehydes such as furfural dialdehyde.

Amides: formamide, dimethylformamide, acetamide,
Dimethylacetamide, propionamide, butyramide, acrylamide, malondiamide, pyrrolidone, caprolactam, etc.

Alcohol: Ethyl alcohol, methyl alcohol, amyl 7/L
/ :l-/L/, monohydric or polyhydric alcohol, such as RIJ serine, hollyvinyl alcohol, or synthetic polymeric alcohol.

Acids: Inorganic acids such as sulfuric acid, hydrochloric acid, and phosphoric acid; organic acids such as formic acid, acetic acid, malonic acid, succinic acid, maleic acid, and tartaric acid.

Inorganic salts = (acidic salts, neutral salts, basic salts, etc.) calcium chloride, sodium chloride, magnesium chloride, potassium chloride,
Chlorides such as aluminum chloride, sulfates such as calcium sulfate, sodium sulfate, aluminum sulfate, aluminates such as sodium aluminate, potassium aluminate, hydrochlorides such as ammonium chloride, zinc chloride, aluminum chloride, sodium chlorate IJ Chlorates such as um, potassium chlorate, sodium perchlorate, potassium perchlorate, carbonates such as sodium carbonate, potassium carbonate, ammonium carbonate, sodium bicarbonate, potassium bicarbonate, ammonium bicarbonate, bisulfuric acid Bisulfites such as sodium, potassium bisulfite, and ammonium bisulfite, bisulfites such as sodium bisulfite, potassium bisulfite, and ammonium bisulfite; fluorosilicates such as sodium fluorosilicate and potassium fluorosilicate; alkalis of silicic acid. Silicates such as metal salts, alkaline earth metal salts, and aluminum salts; borates such as sodium borate, potassium borate, and ammonium borate; phosphoric acids such as sodium hydrogen phosphate, potassium hydrogen phosphate, and ammonium hydrogen phosphate; Hydrogen salts, pyrosulfates such as sodium pyrosulfate, potassium pyrosulfate, and ammonium pyrosulfate; pyrophosphates such as sodium pyrophosphate, potassium pyrophosphate, and ammonium pyrophosphate; sodium dichromate, potassium dichromate, and ammonium dichromate. Permanganates such as dichromates, potassium permanganate, sodium permanganate, etc.

Ca, kl in metal oxides such as quicklime, alumina, iron oxide, magnesium oxide, etc., slag, fly ash, calcium silicate, cement, clay, etc.

Mg salt.

Organic salts: Sodium acetate, sodium phosphate, potassium formate, sodium formate, their low carbon dioxide gas, carbonated water, etc.

Example 1 Test injection was carried out using the injection pipe shown in Fig. 3 in the ground consisting of alternating layers of sandy gravel, fine sand, and silty clay layers from the top up to 10 m from the surface layer.

The composition of the injection solution is as follows.

A: 100 m is applied B: After inserting carbon dioxide gas to the depth of the injection pipe QIOm and passing the discharge port at the end of the outer pipe, feed liquid A from the outer pipe at a distance of 1017 m, and pump B from the inner pipe at 9 m. It was ejected with the injection pressure of atmospheric pressure and was injected from the bottom to the top of the stage. The injection stage was set at every 50 crn, and the injection amount of liquid A was set at 100 t at each stage.

The silty clay layer at the bottom and the sandy clay layer at the top are A.
:Only the B combined liquid is injected, and for the intermediate fine sand layer, 50% of the A:B combined liquid is injected at each stage, then the B combined liquid is stopped, and the A:B combined liquid is injected.
5OL of liquid alone was injected.

The gelation time of the A:B combined solution was 5 seconds.

An excavation survey revealed that the silty clay layer had penetrated into fine veins and solidified. In addition, the fine sand layer was filled with an instant-setting gel mainly around the injection tube, and was uniformly solidified by the liquid A as a whole.

In addition, the entire sandy gravel layer was solidified with an instant-setting gel.Example-2 Test injection was carried out on the sandy ground using the injection pipe shown in Figure 5.

The composition of the injection solution is as follows.

A: Hit 100 B: Hit 100 C: Insert the carbon dioxide gas injection pipe f to a depth of 10 m, pass the outlet at the end of the outer tube, and then pour liquid A from the Y-shaped tube attached to the upper end of the outer tube:
Equal amounts of liquid B were combined, and the combined liquid was sent from the outer pipe at a rate of 15 tons per tube, and B was jetted out from the inner pipe at an injection pressure of 8 atmospheres, and the stage was moved from the bottom to the top and injected. The injection stage was set every 5Ocrn, the inflow amount per stage was 100t, and when 50% of the A:B combined liquid (into which carbon dioxide gas was blown) was injected, the injection of carbon dioxide gas was stopped and A;B
Only the combined solution was injected at 50 ml.

The gelation time of the A:B combined liquid was 1 minute, and the gelation time when carbon dioxide gas was ejected was 4 seconds.As a result of excavation inspection, the entire gravel layer was solidly consolidated and was outside the injection range. No deviation was observed. For comparison, there was no overall dense consolidation observed along the injection pipe to the ground surface.

Further, although the gelation time of the A:B combined solution was 1 minute and the injection time per stage was solo minutes, no gel-H phenomenon occurred in the injection tube.

Example 3 Test injection was carried out in silt-containing fine sand ground using the injection pipe shown in Fig. 1.

The composition of the injection solution is as follows.

A: A mixed solution prepared by adding water glass to sulfuric acid and adjusting the pH to 1, gelation time 10 hours.

B: Mixed solution prepared by adding water glass to sulfuric acid and adjusting the pH to 3, gelling time: 2 hours C: After inserting the water glass aqueous solution injection tube to a depth of 1.0 m, injection stages were taken every 50 crn. For each stage, liquid A was fed at a rate of 1017 m from the outer tube, and liquid C was fed from the inner tube at a rate of 10 t/mm. Liquid B was injected from the tube at 10 t/M.

The gelation time of the A:C combined solution was 7 seconds.

When the ground was excavated and prepared, the entire injection ground was solidified homogeneously.

Despite the long gelation time of solution B, no deviation of the injection solution was observed.

[Brief explanation of drawings]

(a) in Figures 1, 2, 8 and 13
, (b), (c), (a) in Figures 3 and 7
- (e), (a) - ( in Fig. 4, Fig. 5, Fig. 6)
d), Figure 9, Figure 10, Figure 11, Figure 12, Figure 14
(a) and (b) in FIGS. 15 and 16 each show a specific process diagram of the injection tube assembly 51J according to the present invention and the method of the present invention. 1... Inner tube, 1a... Inner tube flow path, 2... Outer tube, 2
a...Cat tube flow path, 3.3a, 3b, 7-M tube outlet, 4.4a. 4b: Elastic bag, 5.5a, 5b: Outer tube lower outlet, 6... Outer tube upper outlet. Patent applicant Shima 1) Shunsuke @ distance's engraving (no change in the inside) (Cn (C) paper, 9th circle (α) Teri (e) 'lq ward (Nni and,)
(gunminato q2 1 and non-recruitment 5 times (ω)
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(Ot) Salary 7 figure (1≦l, n
(IA) @) Fu 9 prisoners @) (1) Raku 10 diagram (α) (C) Jo 11 times ((1) (11) Jun 13 diagram (Cnno? Note R diagram (α)
(4?)洟e)ノ? 1πzonoαη ノ2 Procedural auxiliary device Showa Rido February 26, 2008 Commissioner of the Japan Patent Office Shima 1) Haruki Tono 2, Name of the invention Injection tube and flow path conversion method for the injection tube 3, Relationship with the person making the amendment case Patent applicant 3-30-1 Kasuya, Setagaya-ku, Tokyo 5, Date of amendment order Vol.

Claims (1)

Scope of Claims: (1) At least an inner tube and an outer tube are provided, the inner tube has at least one outlet, at least one of the outlet is closed by an elastic bag, and the outer tube has at least one outlet. The tube has a discharge port at least at the same height as the elastic bag or at a position lower than the stretchable bag, and the flow path inside the tube can be easily changed. (2. In the injection tube according to claim 1,
an inner tube and an outer tube, the inner tube has at least one outlet, at least one of the outlets is closed by an elastic bag, and the outer tube is the same as the elastic bag. an injection tube 0 having at least one lower outlet at or below the height and at least one upper outlet at a position above the elastic bag; At least one of the inner tubes has at least one outlet, at least one of the outlet ports is closed by an elastic bag, and the outer tube has at least one distal end. An injection tube having a discharge port. (4) In the injection tube according to claim 2 or 3, the inner tube having an elastic bag has another outlet in addition to the outlet closed by the elastic bag. Injection tube. (5) At least an inner tube and an outer tube are provided, the inner tube has at least a discharge port blocked by an elastic bag, and the outer tube is located at least at the same height as or below the elastic bag. is inflated by the discharge port, and the inflated elastic bag closes the flow path of the injection tube adjacent to the inner tube, or the flow path of the injection tube close to the inner tube is stopped, and the flow path of the injection tube is stopped. 1. A method for converting a flow path in an injection tube, the method comprising solving the problem and freely converting the flow path in the injection tube. (6) The method according to claim 5, comprising an inner tube and an outer tube, the inner tube having at least a discharge port closed by an elastic bag, and the outer tube having a discharge port closed by the elastic bag. An inlet tube having at least one lower outlet at or below the height of the elastic bag and at least one upper outlet at a position above the elastic bag is used to direct fluid to the elastic bag. to inflate the elastic bag, and the expanded elastic bag closes the flow path of the outer tube or prevents the introduction of fluid into the inner tube. The flow path to the lower outlet of the outer tube is changed to the upper outlet, or vice versa, so that the injection tube flow path can be freely converted. The way I did it. (7) In the method according to claim 5, two or more inner tubes are arranged side by side, and at least one of the inner tubes has at least one outlet, and the inner tube has at least one outlet. At least one of the outer tubes is closed by an elastic bag, and the outer tube has a discharge port at least at its tip, so that the fluid can be passed through the elastic bag and into the flow path of the injection tube adjacent to the inner tube. A method in which the injection tube is closed or the supply of fluid to the inner tube is completely stopped to unblock the inner tube, thereby freely converting the flow path within the injection tube. (8) In the method according to claim 6 or 7, the inner tube has another outlet in addition to the outlet closed by the elastic bag, and the inner tube has another outlet to allow the fluid to flow into the inner tube. The elastic material is introduced into a tube and fully inflated, thereby closing the flow path in the outer tube and discharging the fluid in the inner tube out of the inner tube through the other outlet of the inner tube. How I did it.