JP3458097B2 - Ground injection device and construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground injection device and a method for injecting a ground injection liquid into the ground through an injection pipe installed in the ground and consolidating the ground, and particularly to a pressure during the injection. The present invention relates to a ground injection device and a construction method capable of injecting with a predetermined discharge amount despite the change. Specifically, when injecting simultaneously into a plurality of injection pipes installed in the ground, the ground of each injection pipe is The present invention relates to a ground injection device and a construction method capable of simultaneously injecting a predetermined discharge amount even if there is a difference in injection resistance pressure. More specifically, when injecting a plurality of injection pipes simultaneously, The present invention relates to a ground injection device and a construction method in which simultaneous injection is continued at a predetermined discharge amount without affecting the injection pressure of other injection pipes even if a part of the injection is stopped first.

[0002]

2. Description of the Related Art As a ground improvement technique for injecting an injection liquid into the ground to improve the ground, conventionally, an injection pipe is installed in the ground to be injected, and these injection pipes are pulled up one by one from below to above. Alternatively, a method is known in which the injection is performed while pushing down from above to move the injection stage.

[0003]

However, the target ground to be injected is mostly a soft alluvium, which is composed of soil layers with different water permeability. Therefore, the injection stage is moved. While achieving optimal injection for each soil layer, that is, achieving optimal injection pressure, injection rate, injection amount, injection rate, etc., is extremely complicated,
It took a long time, became uneconomical, and practically impossible.

In recent years, it has been required to prevent liquefaction by injecting ground. In order to prevent such liquefaction, rapid and economical construction of large-capacity soil is required. However, such rapid construction was not possible with the conventional injection method.

Particularly, as described above, the ground is formed by laminating soil layers having different water permeability, so that the pouring pressure is different between the soil layers to cause a pressure change, or the pouring pressure during pouring is changed. It was very difficult to inject the soil with a constant discharge amount due to the change in the soil pressure. Also, when simultaneously injecting from a single pump into multiple injection pipes installed in the ground, if the injection pressure of the ground at each injection pipe discharge port is different, the injection liquid will be discharged only to the low-pressure injection pipe. It was impossible to inject a predetermined amount of injection into a plurality of injection lines at the same time.

Further, a method has also been proposed in which one pump simultaneously feeds the injection liquid to a large number of injection pipes through a large number of orifices or injection ports to inject it into the ground. In this method, when the change width of the resistance pressure of the ground is large, it becomes difficult to inject a predetermined amount. Further, in this method, it is also difficult to maintain the pressure in the liquid delivery pipe that is substantially closed and bundled at a predetermined value from the initial injection to the completion of injection, and to inject at a predetermined discharge amount. In addition, after the injection of any of the many injection tubes is completed, it is difficult to inject the remaining injection tubes while maintaining a predetermined pressure and discharge amount. The reality is that it has not arrived.

For example, when the injection of some of the plurality of injection pipes is completed and the valve of this injection pipe line is closed, the pressure in the liquid delivery pipe suddenly rises and the pressure in the remaining injection pipes is increased. The injection amount increases rapidly, and it becomes difficult to maintain the constant injection amount at a constant injection pressure and continue the injection. Further, it becomes impossible to change the discharge amount from a predetermined injection pipe according to the injection situation.

Therefore, an object of the present invention is to enable injection at a predetermined discharge amount despite the change of the injection pressure at the time of ground injection, and to have different osmotic resistance pressures of a plurality of injection conduit discharge ports. Can be simultaneously injected from a plurality of injection lines at a predetermined injection rate, and even if some of the plurality of injection lines are completed and the injection is stopped, other remaining injection lines can be injected. It can easily inject up to the last single injection line without affecting the flow path and maintaining a predetermined pressure and discharge amount. Furthermore, during injection, the discharge amount from the predetermined injection line can be injected. It is an object of the present invention to provide a ground pouring device and a construction method which can be adjusted depending on the situation and have improved the drawbacks existing in the above-mentioned known art.

Further, another object of the present invention is suitable for ground improvement of large-capacity soil such as liquefaction prevention work or ground improvement for rapid construction in large-scale construction, and in particular, a plurality of injection pipes for the ground to be improved. It is an object of the present invention to provide a ground injection device and a construction method in which a channel is installed and an injection liquid can be simultaneously, selectively, and automatically injected from these plural injection lines.

[0010]

In order to achieve the above object, according to the present invention, a ground injection liquid is injected into the ground through an injection pipe installed in the ground, and the ground is consolidated. In the injection device, the ground injection liquid is sent to an injection pipe through a flow control valve, and is injected into the ground, the flow control valve is a valve body having an inlet and an outlet of the ground injection liquid, An inlet passage leading from the inlet to the inside of the valve body, an outlet passage leading from the outlet to the inside of the valve body,
A balance piston that is movably incorporated between the inlet passage and the outlet passage along these passage directions, and has a throttle portion that communicates with the inlet passage and the outlet passage leading to the inlet passage,
A stretchable elastic body for urging the balance piston is installed in the outlet passage, and the inlet can be freely throttled and opened by movement of the balance piston.

To further achieve the above object, according to the present invention, in a ground injection device for injecting a ground injection liquid into the ground through an injection pipe installed in the ground to consolidate the ground, It is characterized in that the ground injection liquid is divided into a plurality of parts through a distribution valve, respectively fed to the injection pipes, and injected into the ground. The distribution valve has a valve body having an inlet for the ground injection liquid and a plurality of distribution outlets. An inlet passage communicating from the inlet to the inside of the valve body, a plurality of distribution ports communicating from the distribution outlet to the inside of the valve body, and a movable passage built in between the inlet passage and the plurality of distribution ports in a direction crossing these passages. A spool having a throttle portion and an outlet passage, the throttle portion opening to the inlet passage and communicating with the outlet passage, and the outlet passage each opening to each distribution port and communicating with the distribution outlet,
The plurality of outlet passages can be freely throttled and opened by moving a spool.

Furthermore, in order to achieve the above-mentioned object,
According to the present invention, in the ground injection device for injecting the ground injection liquid into the ground through a plurality of injection pipes installed in the ground and consolidating the ground, an injection liquid pressurizing unit for pressurizing the injection liquid. And an injecting liquid distributor that has a plurality of branch pipes communicating with the plurality of injecting pipes, and distributes the pressurized injecting liquid from the pressurizing unit to each of the branch pipes through a distributor to send the liquid to the injecting pipes. and a part, the dispensing device (a) below or consist valve (B), or (a) and (B) Na in combination a valve <br/> is, from the injection fluid pressure portion One injection system for pressurized injection liquid
It is characterized in that the plurality of injection lines are simultaneously injected through
And

(A) A valve body having an inlet and an outlet for the injection liquid, an inlet passage communicating from the inlet to the inside of the valve body, an outlet passage communicating from the outlet to the inside of the valve body, and between the inlet passage and the outlet passage. A balance piston that is movably built in along these passage directions and that has a throttle portion that communicates with an inlet passage and an outlet passage that communicates with the inlet passage, and a stretchable member that is mounted in the outlet passage and that urges the balance piston. A flow control valve having an elastic body, the inlet of which can be freely throttled and opened by movement of a balance piston.

(B) A valve body having an inlet for the injecting liquid and a plurality of distribution outlets, an inlet passage communicating from the inlet to the inside of the valve body, a plurality of distribution ports communicating from the distribution outlet to the inside of the valve body, Built in between the inlet passage and multiple distribution ports movably across these passages,
A spool having a throttle portion and an outlet passage, the throttle portion opening to the inlet passage and communicating with the outlet passage, and the outlet passage opening to each distribution port and communicating with the distribution outlet, wherein the plurality of outlet passages are spools. A distribution valve that can be throttled and opened freely by moving the.

Further, to achieve the above object, according to the present invention, the ground injection liquid is injected into the ground through a plurality of injection pipes installed in the ground, and the ground is consolidated. In the ground injection device to be described, the injection liquid is sent to each injection pipe line through a narrowed portion and injected into the ground, and a liquid sending pressure gauge and And / or a liquid flow meter and an injecting liquid return device are provided,
The injecting liquid returning device divides the injecting liquid in the liquid feeding system from the liquid feeding system based on information from the liquid feeding pressure gauge and / or the liquid feeding flow meter so that the liquid pressure of the liquid feeding system is desired. By maintaining the pressure, the discharge amount of the injection liquid sent to each injection pipe line through the throttle part is adjusted to a predetermined amount, and injection is performed.
It is characterized in that the liquid is simultaneously injected from a plurality of injection lines .

Further, in order to achieve the above-mentioned object, according to the present invention, a ground injection device for injecting the ground injection liquid into the ground through a plurality of injection pipes installed in the ground and consolidating the ground. In, having an injection liquid pressurizing unit for pressurizing the injection liquid, and a plurality of branch pipes communicating with the plurality of injection pipe lines,
An injection liquid distribution unit for distributing the pressurized injection liquid from the pressurization unit to each branch pipe through a distribution device and sending the injection liquid to the injection pipe line, and from the injection liquid pressurization unit to the injection liquid distribution unit. A liquid feeding pressure gauge and / or a liquid feeding flow meter and a liquid feeding returning device are provided in the liquid feeding system of the pressurized liquid to be fed, and the liquid feeding returning device is provided from the liquid feeding pressure meter and / or the liquid feeding flow meter. Based on the information of the above, by dividing the injection liquid in the liquid supply system from the liquid supply system, the liquid pressure of the liquid supply system is maintained at a desired pressure, whereby the branch pipes from the respective branch pipes through the distributor. Hold the discharge amount of the injection liquid sent to the
Simultaneously inject the injection liquid from multiple injection lines ,
Even if one of the multiple branch pipes stops the injection, the injection amount of each of the remaining branch pipes is maintained at a predetermined amount and multiple injection liquids are injected.
It is characterized by simultaneous injection from a duct .

Further, in order to achieve the above-mentioned object, according to the present invention, in the ground pouring method of pouring the ground injection liquid into the ground through a plurality of injection pipes installed in the ground and consolidating the ground. An injection liquid pressurizing unit for pressurizing the injection liquid,
An injecting liquid distributor having a plurality of branch pipes communicating with the plurality of injecting pipes, and distributing the pressurized injectable liquid from the pressurizing unit to each branch pipe through a distributor and sending the liquid to the injecting pipes. A liquid feeding pressure gauge and / or a liquid feeding flow meter provided in a liquid feeding system for the pressurized liquid to be infused from the liquid injecting portion pressurizing unit to the liquid to be infused portion, an injecting liquid returning device, and the liquid feeding pressure. And / or a liquid flow meter for receiving information from these and using a ground injection device equipped with a control unit for giving an instruction to a return device based on this information When injecting into the ground through the injecting / distributing section, the injecting is performed while giving an instruction to the return device to divide the flow to maintain the liquid pressure of the liquid feeding system at a desired pressure. Liquid is sent from each branch pipe to the injection line Holding the discharge amount of the liquid inlet to the desired amount
Simultaneous injection of injection liquid from multiple injection pipe lines , and even if any of the branch pipes stops the injection, the discharge amount of each of the remaining branch pipes is maintained at a predetermined amount and the injection liquid is injected multiple times. tube
It is characterized by simultaneous injection from the road .

[0018]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view of a specific example of the flow control valve used in the present invention. FIG. 2 is a sectional view of a specific example of the distribution valve used in the present invention.

FIG. 3 is a schematic view of a specific example of the ground injection device using the flow control valve according to the present invention. FIG. 4 is a schematic view of a specific example of the ground injection device using the flow control valves according to the present invention in combination in series and in parallel. FIG. 5 is a schematic view of a specific example of a ground injection device using a plurality of flow control valves according to the present invention in parallel. FIG. 6 is a schematic view of a specific example of the ground injection device in which the flow control valves according to the present invention are combined in series and in parallel.

FIG. 7 is a schematic view of a specific example of the ground pouring device using the distribution valve according to the present invention. FIG. 8 is a schematic view of a specific example of a ground injection device using a plurality of distribution valves in parallel according to the present invention.

FIG. 9 is a schematic view of a specific example of a ground injection device using a flow control valve and a distribution valve in series combination according to the present invention. FIG. 10 is a schematic view of a specific example of a ground injection device in which a plurality of flow control valves and distribution valves in series according to the present invention are arranged in parallel. FIG. 11 is a schematic view of a specific example of a ground injection device in which a plurality of flow control valves and a plurality of distribution valves in series according to the present invention are combined in parallel.

FIG. 12 and FIG. 13 are schematic views of a specific example of the ground injection device in which the distribution valves according to the present invention are combined in series and in parallel.

In FIG. 1, the flow control valve A is a valve body 1
, Inlet passage 4, outlet passage 5, and balance piston 6
And a spring 9.

The valve body 1 has an inlet 2 for introducing the ground injection material in the arrow direction and an outlet 3 for discharging the ground injection material in the arrow direction, and an inlet passage 4 communicates with the inside of the valve body 1 from the inlet 2 and an outlet passage 5 Communicates with the inside of the valve body 1 through the outlet 3.

The balance piston 6 is housed between the inlet passage 4 and the outlet passage 5 so as to be movable along these passage directions, and communicates with the inlet passage 7 and the outlet passage 5.
It has a narrowed portion 8 (orifice) that communicates with. In addition,
The inlet 7 can be freely throttled and opened by moving the balance piston 6 in the passage direction.

The stretchable elastic body 9 is, for example, a spring 9 as shown in FIG. 1, and is mounted in the outlet passage 5,
The balance piston 6 is biased from the direction of the outlet passage 5.
As such an elastic elastic body 9, in addition to the spring 9 shown in FIG. 1, although not shown, a synthetic resin cushion material having a spring therein, and a cushion material in which the spring is covered with an elastic film such as rubber. Alternatively, various cushion materials such as a flexible cushion material made of synthetic resin such as hard rubber may be used so that the gel of the injecting liquid is not clogged between the springs to prevent the functional deterioration.

In the flow rate control valve A shown in FIG. 1 having the above structure, when the pressure P1 increases on the inlet 2 side and the flow rate passing through the throttle portion 8 (orifice) tries to increase, the pressure P on the inlet 2 side is increased.
1 and the pressure P2 on the outlet 3 side increase P1-P2, the balance piston 6 pushes the spring 9 and the outlet 3
Move to the side. Due to this movement, the introduction port 7 is narrowed and the opening is reduced, and the flow rate of the gas flowing in through the introduction port 7 is reduced.

Further, when the pressure P1 on the inlet 2 side becomes low and the flow rate through the throttle portion 8 is reduced, the pressure P on the inlet 2 side is reduced.
The pressure difference P1-P2 between 1 and the pressure P2 on the outlet 3 side becomes small, and the balance piston 6 is urged by the spring 9 to move to the inlet 2 side. Due to this movement, the introduction port 7 is expanded and the opening is enlarged, so that the flow rate flowing from the introduction port 7 increases. That is, the flow rate control valve A according to the present invention always discharges a constant discharge amount from the outlet 3 despite the pressure change on the inlet 2 side and the outlet 3 side.

When the pressure P2 on the outlet 3 side increases during injection, the difference between the pressure P1 on the inlet 2 side and the pressure P2 on the outlet 3 side decreases, and the flow rate through the throttle portion 8 tends to decrease, the balance piston 6 Is urged by the spring 9 to move to the inlet 2 side, and the inlet 7 is expanded so as to increase the flow rate. On the other hand, when the pressure P2 on the outlet 3 side decreases and the differential pressure between the pressure P1 on the inlet 2 side and the pressure P2 on the outlet 3 side increases and the flow rate passing through the throttle portion 8 tends to increase, the balance piston 6
Presses the spring 9 and moves to the outlet 3 side, and the inlet 7 is narrowed to act to reduce the flow rate. As a result, despite the pressure changes on the inlet 2 side and the outlet 3 side, the outlet 3
Always discharges a constant amount. Therefore, even if gelation progresses during the injection and the ground resistance pressure increases, a constant discharge amount can be maintained.

In the injection, it is desirable that the injection pressure and the discharge amount are most suitable for the soil layer to be injected. It is necessary to maintain a predetermined pump pressure and inject at a discharge amount corresponding to it, but the pump pressure fluctuates due to changes in the ground during injection, changes in permeation resistance due to gelation, or variations in injection operation, The discharge rate also tends to change. On the other hand, according to the present invention, a substantially constant discharge amount can be maintained by the function of the valve, despite the pressure change on the inlet side and the outlet side.

FIG. 5 shows an example of simultaneously injecting into a plurality of injection pipes through the flow control valve A. In this case, even if there is a portion where the ground resistance pressure is high, the injection liquid is injected with a low resistance pressure. It is possible to inject into all of the infusion lines at a constant infusion rate without being concentratedly flowing into the infusion lines.

In FIG. 2, the distribution valve B includes a valve body 12, an inlet passage 13, a plurality of distribution ports 14 and 14, and a spool 17.
And is configured.

The valve body 12 includes an inlet 10 for introducing the ground injection material in the arrow direction and a plurality of distribution outlets 1 for discharging the ground injection material in the arrow direction.
1 and 11, the inlet passage 13 leads from the inlet 10 to the inside of the valve body 12, and the distribution ports 14, 14 from the distribution outlets 11, 11 to the valve body.
Open to 12 inside.

The spool 17 is built between the inlet passage 13 and the plurality of distribution ports 14, 14 so as to be movable in a direction traversing these passages, and has a plurality of throttle portions 15, 15 and an outlet passage 16,
Has 16. The throttle portions 15 and 15 open to the inlet passage 13 and communicate with the outlet passage 16, and the outlet passages 16 and 16 also open to the distribution ports 14 and 14 to communicate with the distribution outlets 11 and 11. The plurality of outlet passages 16 and 16 can be freely throttled and opened by moving the spool 17.

Distributing valve B shown in FIG. 2 and constructed as described above.
If the load on each distribution port 14, 14 is the same, each throttle unit 15,
There is almost no pressure difference around 15 and the discharge amount to each distribution port 14 is the same.

Further, when the loads on the distribution ports 14 and 14 are different, a pressure difference between the throttle portions 15 and 15 is generated.
The spool 17 moves to the distribution port side of the lower pressure (the smaller load) to expand the outlet passage 16 of the distribution port 14 of the higher pressure (the larger load), and at the same time, to the lower pressure (the smaller load). The outlet passage 16 of the (smaller) distribution port is throttled so that the pressure difference in the distribution port is eliminated and the discharge amount to each distribution port 14 is the same, and as a result, the discharge amount to the distribution port is always constant. To do.

That is, when the loads on the distribution ports 14 and 14 are different, for example, when the pressure P1 in FIG. 2 is larger than the pressure P2, the spool 17 moves until the pressure P1 and the pressure P2 become the same pressure. The outlet passage 16 of the distribution port 14 of the lower side (the smaller load) is throttled (at the same time, the throttle portion 16 of the larger load is expanded), and as a result, the pressures P1 and P2 become the same pressure, and both ports 14, The discharge amount from 14 is the same. In FIG. 2, elastic elastic bodies such as springs (not shown) may be attached to both ends of the spool 17 as in the balance piston shown in FIG.

In the present invention, the ground injection liquid is injected into the ground through an injection pipe installed in the ground, and in the ground injection device for consolidating the ground, the ground injection liquid is supplied to the flow control valve A described above. Through the distribution valve B or through the distribution valve B, or further through both the flow rate control valve A and the distribution valve B to deliver the solution to the injection conduit and inject it into the ground. The details of these are as shown in FIGS. 3 to 11.

FIG. 3 shows an example of a ground injection apparatus using one flow control valve A shown in FIG. 1 according to the present invention, in which the pump 18 and the flow control valve A are connected to each other through a connecting portion 20 in the ground. It is configured to be connected to the injection line 19.

FIG. 4 shows an example in which the flow control valves A according to the present invention are combined and arranged in series and parallel, and FIG. 5 shows an example in which a plurality of flow control valves A, A ... A are arranged in parallel. 6 shows an example in which a plurality of the arrangement examples of FIG. 4 are arranged in parallel, and any of the devices can discharge a constant amount of discharge despite the pressure change.

FIG. 7 shows an example of a ground injection device using one distribution valve B shown in FIG. 2 according to the present invention.
And the distribution valve B are connected to the injection pipe line 19 in the ground through the connecting portion 20.

Here, in FIG. 7, when the injection pressure of the pump 18 is 20 kg / cm ² and the load on the outlet side is zero, the distribution valve B
The throttle portions 15, 15 of the distribution valve B are determined so that the discharge amount of each of them is the same amount from the distribution ports 14, 14 and the total amount is 12 l / min, and the distribution outlets 11, 11 in FIG. Part 20
A needle valve (not shown) is provided at the tip of the injection pipe lines 19, 19 connected by, and the opening ratio of the needle valve is adjusted to variously change the pressure ratio of the load at the two distribution outlets 11 and 11 The discharge amount discharged from 14, 14 was measured. The measurement results are as follows.

(1) When the pressure difference between both distribution ports is zero (the same pressure), the discharge amounts discharged from these distribution ports 14 and 14 were 6.0 l / min, which were the same. (2) When one was zero and the other was 10 kg / cm ² , the discharge amount discharged from both ports was 6.0 l / min. (3) When one was zero and the other was 15 kg / cm ² , both discharge amounts were 6.0 l / min. (4) When one was zero and the other was 20 kg / cm ² , the discharge amount discharged from one distribution port was 6.2 l / min and the other discharge amount was 5.8 l / min. (5) It was almost the same when the pressure difference was reversed.

From the above measurement results, both distribution ports 14, 14
It can be seen that the discharge amount discharged from both distribution ports 14 and 14 changes little and is constant regardless of whether or not the pressure difference is given to both pressure changes.

FIG. 8 shows an example in which a plurality of distribution valves B are used in parallel. In this case, the discharge amount from the pump 18 is 60 l / min evenly divided into quarters (15 l / min). B, B
..Distribution to B, and then to each of the distribution valves B, B ... B in half (7.5 l / min). It is discharged into the ground.

FIG. 9 shows an example in which the flow control valve A and the distribution valve B are connected in series. The discharge amount of 20 l / min from the pump 18 passes through the flow control valve A, and further through the distribution valve B. Is 10 l / min, and a substantially constant amount of the ground injection material is discharged into the ground regardless of the pressure change in the ground.

FIG. 10 shows an example in which a plurality of the devices of FIG. 9 are arranged in parallel, and the respective injection pipe lines 19, 19 ... 19 are arranged.
As in the case of FIG. 9, the ejection amount is almost the same.

FIG. 11 shows an example in which a flow control valve A, a distribution valve B, two distribution valves B and B are arranged in series, and a plurality of these are arranged in parallel. And it can certainly improve. In this case, of course, in spite of the pressure change in the ground, a constant discharge amount is discharged from each of the injection pipe lines 19, 19 ... 19 into the ground.

FIGS. 12 and 13 show an example in which the distribution valves B are combined in series and in parallel. In this case as well, the discharge amount discharged from each distribution port of the distribution valve B is substantially constant,
Moreover, even if the pressure of the ground changes, a certain amount of the ground injection material is discharged into each of the injection pipes.

FIG. 14 shows an example in which the ground injection device according to the present invention using the flow control valve A in FIG. 3 is provided with an injection liquid return system RS. Injection liquid return system RS
Is a liquid delivery system to the flow control valve A of the injection liquid, that is, a conduit F
The liquid delivery pressure gauge P ₀ and / or the liquid delivery flow meter f ₀ ,
And an injection liquid return device RA, and these are signal-connected via the flow rate pressure control device C. Then, the injection liquid passes from the injection liquid tank T through the conduit F by the operation of the pump 18, and the flow rate is controlled through the injection liquid return device RA, the liquid sending flow meter f ₀ , and the liquid sending pressure gauge P ₀ provided in the conduit F. It reaches the valve A and is injected into the ground from the connecting portion 20 through the injection pipe line 19.

At this time, in the injection liquid return device RA, the flow rate pressure control device C receives signal information from the liquid delivery pressure gauge P ₀ and / or the liquid delivery flow meter f ₀ , and based on this information, the liquid delivery system (conduit). The valve of the injection liquid return device RA is adjusted so that the injection liquid in F) is kept at a predetermined pressure, and a part of the injection liquid is diverted to the return pipe R and returned to the injection liquid tank T.

As a result, the pressure of the injecting liquid in the conduit F is always kept at a predetermined pressure, whereby the discharge amount of the injecting liquid sent to the injecting conduit 19 through the flow rate control valve A is adjusted to a desired amount. .

Here, using the apparatus shown in FIGS. 1 and 14,
When the injection pressure of the pump 18 is 20 kg / cm ² , the throttle portion 8 of the flow control valve A is determined so that the discharge amount of the flow control valve A becomes 12 l / min when the load on the outlet side is zero, and the connecting portion A needle valve (not shown) is provided at the tip of the injection conduit 19 connected by 20, and the opening of this needle valve is adjusted to adjust the flow control valve A.
The discharge amount was measured by variously changing the pressure on the outlet side (corresponding to the resistance pressure of the ground). The measurement results are as follows.

Ground resistance pressure (kgf / cm ² ) Discharge rate (l / min) 0 11.1 5 11.1 10 11.0 15 11.0

A similar test was conducted using a valve provided with an orifice of the same area without using the flow control valve A. When the ground resistance pressure exceeded 10 kgf / cm ² , the discharge rate was 5 l / min or less. Decreased to. Moreover, when a test was conducted without using a return device, adjustment to keep the pump pressure at 20 kgf / cm ² in response to changes in ground resistance pressure was made unless adjustment was made with the inverter in FIG. It was very difficult, and therefore it was difficult to keep the discharge amount constant.

On the other hand, by using the above-mentioned return device, the predetermined pump pressure can be maintained easily and automatically without adjusting with the inverter, and the pressure on the outlet side of the flow control valve A can be changed. Regardless of (change in ground resistance pressure), the discharge amount is always a substantially constant amount, and therefore the practicality is dramatically improved.

FIG. 15 shows a specific example of a modification of the injection liquid return device RA and the return pipe R according to the present invention. The return line R from the injection liquid return device RA does not necessarily have to be connected to the injection liquid tank T, and
May be connected to a conduit F leading to the pump 18 from which the infusate is returned to the conduit F.

FIG. 16 shows an injection liquid return system R for the ground injection apparatus according to the present invention using the distribution valve B shown in FIG.
An example with S is shown. This device is similar to FIG. 14 except that a distribution valve B is provided instead of the flow control valve A in FIG.
Is the same as. That is, a liquid delivery system to the injecting liquid distribution valve B, specifically, a conduit F is provided with a liquid delivery pressure gauge P ₀ and / or a liquid delivery flow meter f ₀ , and an injectate return device RA. The injection liquid return device RA is a liquid delivery pressure gauge P.
₀ and / or based on information from the liquid flow meter f ₀ ,
That is, the liquid sending pressure system P ₀ and / or the liquid sending flow meter f
Based on the information from the flow control device C signaled to ₀ , the injection liquid in the liquid supply system is diverted from the liquid supply system via the return pipe R and returned to the injection liquid tank T to transfer the liquid. The hydraulic pressure of the system is maintained at a desired pressure, whereby the discharge amount of the injection liquid sent to the injection pipes 19, 19 through the distribution valve B is adjusted to the desired amount.

Hereinafter, using the distribution apparatus according to the present invention, that is, the flow control valve A of FIG. 1 or the distribution valve B of FIG. 2, the ground injection liquid is passed through a plurality of injection pipelines installed in the ground. A ground injection device for simultaneously injecting the same will be specifically described in detail. Note that FIG. 17, FIG. 18, and FIG.
0, FIG. 21, and FIG. 22 correspond to the flow control valve A of FIG. 1 or the distribution valve B of FIG. 2 in any of the various combinations shown in FIGS.

FIG. 17 is an explanatory view of a concrete example of a ground injection apparatus for simultaneously injecting through a plurality of injection pipe lines, and includes a control section X, an injection pressurization section Y, an injection liquid distribution section Z, an injection section W and a liquid sending. It is composed of system A. FIG. 18 is an explanatory diagram of another specific example of the injection distribution unit in FIG. Here, the liquid delivery system A refers to a range in which the pressurized injection liquid up to the throttle portion or the branch valve is being sent under pressure by the injection liquid pressurizing portion. Further, the branch valve V may also serve as the throttle portion.

As shown in FIG. 17, the injecting liquid pressurizing unit Y pressurizes the injecting liquid from the injecting liquid tank 21 by the grout pump 22, and as the pressurized injecting liquid, the injecting liquid distributing unit via the liquid sending system A. Transfer to Z. The grout pump 22 receives an instruction from the injection monitoring board X1 of the controller X and pressurizes the injection liquid to a desired pressure. As shown in FIG. 19, the pressurizing unit Y in FIG. 17 may use a compressor 23 instead of the grout pump. That is, the injection container 25 is filled with the injection liquid 25, and the operation of the compressor 23 pressurizes the injection liquid 25 from the injection liquid tank 21 to form a pressure injection liquid.

The injecting liquid distributing section Z comprises a plurality of branch pipes S, S.
..S is provided. Each of the branch pipes S, S ... S has a connecting portion 20 which is connected to the injection pipe lines 19, 19 ... 19 at the tip. This connecting portion 20 is a predetermined injection pipe line 19,
At the time when a predetermined injection amount is completed through 19 ... 19 or when a predetermined injection pressure is reached, the branch pipe S is connected to another injection pipe line 19, 19 ... 19. You can also The branch pipes S, S ... S are arranged so as to extend from the distribution device 26 as shown in FIG. 17, and are connected to the injection conduit 19 at the connecting portion 20 at the tip. Then, the pressurized injection liquid from the pressurizing section Y is passed through the distribution device 26 to each branch pipe S,
It is distributed to S ... S and is sent to the injection conduit 19. Further, in FIG. 17, the branch flow rate systems f ₁ , f _2, ...
If the total amount of f _i and f _n is measured, the flow rate of the liquid sending flow system f ₀ can be grasped, and in this case, the liquid sending flow system f ₀ is not always necessary.

17 to 18, the branch pipes S, S.
Each ·· S, the branch valve _{V 1, V 2 ··· V i} ,
V _n is attached, and if necessary, a branch flow meter f ₁ ,
f ₂ ... F _i , f _n , and / or branch pressure gauges P ₁ , P ₂ ... P _i , P _n are mounted. These branch pipes S, S ... S send the pressurized injection liquid from the pressurization unit Y to the respective injection pipe lines 19, 19 ... 19 via the connecting portion 20. In addition,
Branch flow meter f ₁ ~f _n may also be provided on the upstream side of the branch valve V ₁ ~V _n. Further, the branch valves V _{1 to} V _n
The liquid feed valve V ₀ is not necessarily required by providing the function of the stop valve.

A liquid feeding flow meter f ₀ and / or a liquid feeding pressure gauge P ₀ is provided in the liquid feeding system A of the pressurized liquid to be infused from the liquid injecting portion Y to the liquid distributing portion Z, that is, in the conduit 27. To be Further, a liquid feeding valve V ₀ is provided in the conduit 27 downstream of the liquid feeding flow meter f ₀ and / or the liquid feeding pressure gauge P ₀ or upstream of the branch pipe S. In addition, the above-mentioned liquid transfer system A
Is a system up to the throttle part of the injecting liquid distribution part Z or a branch valve.

The control section X is mainly composed of the injection monitoring board X1.
In addition to this, operation panel X2, injection recording panel X3, and data
Built-in input device X4, or these are outside control unit X
From the signal circuit to the control unit X.
This control unit X is a liquid flow meter f ₀, Liquid delivery pressure gauge P₀, Branch
Flow meter f1`<sub>n</sub>And branch pressure gauge P0`_nOne of
Or two or more, and the signal pressurizing unit Y
Liquid flow meter f connected by a line₀And / or send
Liquid pressure gauge P₀Information from the branch pressure gauge P₁, P
₂... P_i, P_nAnd / or branch flow meter f₁, F
₂... f_i, F_nInjection pressurization unit Y based on the information from
To control.

As a result, the injection liquid is supplied from one liquid supply system to a plurality of injection pipe lines 19, 19 ... 19 at a predetermined set flow rate or set pressure of the pressurized injection solution or at a flow rate or pressure within a limit range. In addition, at the same time, selectively or additionally, liquid is automatically fed or injected. Further, it is possible to obtain a predetermined discharge amount corresponding to the predetermined pressure of the pressurized injection liquid and the area of the flow passage of the throttle portion or the branch valve.
Rapid and reliable improvement of a wide range of ground.

Further, the branch valve V₁, V₂...
V_i, V_nThe operation of can be done manually, but it
It is also possible to operate the control unit X by the respective signal circuits.
Then, the above-mentioned liquid flow rate meter f₀And / or delivery pressure
Total P₀Based on information from the
And / or branch valve based on information from the branch pressure gauge
V ₁, V₂... V_i, V_nOn / off and squeezing
The injection liquid tank of the injection liquid pressurizing unit Y as shown in FIG.
Switching system to return pipes R, R ... R leading to 21
Furthermore, although not shown, switching control to the flush pipe line is possible.
Branch valve V₁, V₂... V_i, V_nDone by
Be done. Further, the other injection conduits 19 of the branch pipes S, S ... S,
19 ... 19 will also be changed.

In FIG. 17, the return line R is directly provided to the branch valves V ₁ , V ₂ ... V _i , V _n . Then, when the predetermined injection amount from each of the branch pipes S, S ... S is completed, the injection liquid is returned to the injection liquid tank 21 through the return pipe R, or the branch pipes S, S.
By connecting S to the other injection pipe lines 19, 19, ... 19, all branch pipes S, S ... With the same liquid supply pressure without adjusting the inverter 23 to adjust the liquid supply flow rate. -The injection can be continued until the injection from S is completed. Although not shown in the drawing, the washing lines are branch valves V ₁ , V ₂ ... V _i , V _n.
The branch pipe, the distribution device, etc. are washed with water by switching.

Further, a liquid feeding valve V provided in the conduit 27
_{Although 0} can also be manually operated, it can also be operated by connecting to the control unit X by a signal circuit. Then, similar to the above, based on the information from the liquid flow meter f ₀ and / or the liquid pressure gauge P ₀ , or alternatively, the branch flow meters f ₁ , f ₂ ,.
..F _i , f _n and / or branch pressure gauges P ₁ , P ₂
· · P _i, based on information from the P _n, on-off control of the liquid feed valve V _0, it is possible to perform the throttle control of the opening degree of the liquid supply valve V _0. An electromagnetic valve, an air valve, a hydraulic valve, or the like is used as the liquid feeding valve or the branch valve.

Further, branch flow meters f ₁ , f ₂ ... f _i , f _n and / or branch pressure gauges P ₁ , P _2, ... P _i and P _n are also connected to the control unit X by a signal circuit. Then, the same control as described above can be performed based on the information from the branch flow meter and / or the branch pressure gauge, or further based on the information from the liquid feed flow meter f ₀ and / or the liquid feed pressure meter P _0. is there.

The branch flow meters f ₁ , f ₂ ...
An arbitrary flow meter such as a rotary flow meter or an electromagnetic flow meter can be used for f _i and f _n , and an electric signal output as a pulse is input to the control unit X and counted. Further, the inverter 23 is controlled by an instruction from the control unit X to the injection liquid pressurizing unit Y based on the information from the liquid flow meter and / or liquid pressure gauge, and the branch flow meter and / or the branch pressure meter, The rotation speed of the grout pump 22 is adjusted, the flow rate f ₀ per minute and the injection pressure P ₀ are controlled, and the flow rate of the branch pipe S is controlled.

Further, the injection liquid distribution section Z in FIG.
As shown in FIG. 18, from each branch pipe S, S ... S
Branch flow meter f₁, F₂... f_i, F_nAnd branch pressure
Total P ₁, P₂... P_i, P_nWas removed
May be.

The reason for this is that the distribution amount of the injection liquid to each branch pipe is determined by the pressure of the liquid sending system and the area of the throttle portion or the area of the flow path of the branch valve. Are almost the same. Therefore, even if the branch flow meter is not provided, if it is considered that the injection liquid is distributed and injected evenly in the entire improved block, only the measurement of the liquid supply flow meter f ₀ and the liquid supply pressure gauge P ₀ is required. The device can be simplified. This can also be an advantage of the present invention. As a matter of course, as shown in FIG. 21, it is also possible to provide a liquid feed pressure gauge P ₀ or a liquid feed flow meter f ₀ on any of the branch pipes to check them.

As shown in FIG. 17, the injection part W is the ground.
It consists of a plurality of injection pipe lines 19, 19 ... 19 installed in 27, and each branch pipe S of the injection liquid distribution part Z, S ...
A plurality of injection pipe lines 19, 19, ... Are connected to the S injection liquid and the pressurized injection liquid from the injection liquid pressurizing section Y is passed through the branch pipes S, S.
It is injected into the ground 27 through 19 to solidify the ground 27.

FIG. 23 shows an example in which an injection liquid return system RS is provided in the ground injection device shown in FIG. First,
The return line R in FIG. 17 is not necessary. Therefore, the device becomes very simple. Then, the delivery pressure gauge P ₀ and the injection liquid P are supplied to the delivery system A of the injection liquid from the injection liquid pressurization unit Y to the branch valve of the injection liquid distribution unit Z, that is, to any portion of the conduit 27 or the distribution device. A return device RA is provided, and a flow rate pressure control device C is provided in the controller X. Then, the liquid delivery pressure gauge P ₀ and / or the liquid delivery flow meter f ₀ is connected to the flow rate pressure control device C, and the injection liquid return device RA is also connected to the flow rate pressure control device C.

The injection liquid return device RA is a delivery pressure gauge P _0.
And / or based on the information from the liquid flow meter f ₀ , the injection liquid in the liquid supply system A is branched from the liquid supply system A to the return pipe R to return a part of the injection liquid to the injection liquid tank 21. As a result, the liquid pressure of the liquid supply system A is maintained at a desired pressure, whereby liquid is supplied from the respective branch pipes S, S ... S to the injection pipe lines 19, 19 ... 19 through the distributor 26. While adjusting the discharge amount of the injection liquid to a desired amount, a plurality of branch pipes S, S.
..Even when one of the S ends or stops the injection, the pressurized injection liquid in the distribution device does not change in pressure, and thus the remaining branch pipes S, S are kept at a predetermined pressure.
It is possible to inject while maintaining the discharge amount of S at a predetermined amount, and automatically inject the same discharge amount up to the last one. The above-mentioned return device can also be provided in FIGS. 17, 18, 20, 21, and 22.

The advantage of providing such a return device is that one distribution device passes through a plurality of branch pipes and has a predetermined pressure. Therefore, the cross-sectional area of the flow path of the branch pipe (if a branch valve is attached to the branch pipe, The cross-sectional area of the flow rate is the cross-sectional area of the flow path of the branch pipe.) The injection liquid can be distributed with a predetermined discharge amount. This is possible even without a valve in the line from the distributor to the branch pipe.

The reason for this is that if the cross-sectional area in the flow direction of the injection liquid in the distributor is larger than the total of the cross-sectional areas of the plurality of branch pipes, the injection liquid in the distributor upstream of the branch pipe will be sent by the pump. If the amount is increased, it will always be in a pressurized state. Therefore, if the above-mentioned return device is provided, the injection liquid in the distribution device can be maintained at a predetermined pressure, so that the partial flow rate corresponding to the cross section of the branch pipe can be obtained and the discharge amount can be controlled to a predetermined discharge amount. A possible infusion system.

Further, if a branch flow meter is provided in the branch pipe,
You can inject it while checking it. In addition, the number and cross section of the plurality of branch pipes are set so that the pressure of the injection liquid from the branch pipes to the injection pipe line is lower than the pressure of the injection liquid in the distributor, and the return device described above is used. If injection is performed, it is possible to maintain a predetermined discharge amount from a plurality of injection pipes and perform injection at the same time.

The above-mentioned distributor 26 may be the flow control valve A or the distribution valve B having the throttle portion (orifice) inside as shown in FIGS. 3 to 13, or the combination of the flow control valve A and the distribution valve B. It may be a throttle portion described later, that is, an orifice, an injection nozzle, a throttle valve or a throttle adjusting valve.

The advantage of the throttle portion in the present invention is that the throttle portion is made into a fine hole to have a minimum required pump flow rate,
In addition, the return amount can be minimized to easily increase the pressure in the distributor, and a large number of branch pipes are provided to maintain a large pressure difference between the upstream side and the downstream side of the throttle portion. Therefore, even if the ground resistance pressure of each injection pipe varies,
Further, even if the ground resistance pressure fluctuates, the same discharge amount can be maintained, and a large amount of soil can be rapidly injected by simultaneously injecting from a large number of branch pipes.

The narrowed portion in the present invention has a diameter of 0.2 mm to 3 mm.
Is preferable, and in particular, about 0.5 mm to 2 mm is more preferable.
Further, the pressure of the liquid feeding system is preferably 10 kgf / cm ² or more, and usually 20 to 50 kgf / cm ² is used. Depending on the size of the throttle and the delivery pressure, 1 to 10 liters per branch pipe
A discharge amount of about / minute can be obtained. Of course, if necessary, it is also possible to use a larger diameter of the throttle and to inject at a high delivery system pressure and a large discharge amount.

FIG. 24 shows a ground injection device for sending an injection liquid to an injection pipe line through a large number of narrowed portions and injecting it into the ground. An injection liquid return system RS is provided in a liquid feeding system reaching the narrowed portion of the injection liquid. Is an example in which is provided. That is, a liquid feeding pressure gauge P ₀ and an injecting liquid returning device are provided in the liquid feeding system (conduit) F that reaches the narrowed portions T _r1 ... T _rn of the injecting liquid. And
The flow rate pressure control device C receives signal information from the liquid delivery pressure gauge and transmits this signal to the injecting liquid return device RA. The injecting liquid return device RA divides the injecting liquid in the liquid feeding system F from the liquid feeding system F into the return pipe R and returns it to the injecting liquid tank T based on the information from the liquid feeding pressure gauge P _0. The liquid pressure of the liquid system F is maintained at a desired pressure, and thereby, the discharge amount of the injecting liquid sent from the branch pipe S to the injecting pipe through the throttle portion T _r is maintained at a predetermined amount.

In FIG. 24, the injection liquid is injected from the high pressure portion on the upstream side of the throttle portion T _r to the low pressure portion on the downstream side. In this case, if the pressure difference between the injection pressure P ₀ of the pressurized injection liquid and the injection pressure P ₁ ′ _n of the injection ground is sufficiently large, the throttle portion T
_{Even if} the injection pressure of each branch pipe S on the downstream side of _r varies, the discharge amount (injection speed) of each branch pipe S is substantially the same if the area of the throttle portion T _r is the same. The discharge amount is determined by the injection pressure P ₀ and the area of the hole of the narrowed portion T _r .

However, in FIG. 24, the injection liquid is not always injected in exactly the same way from all the branch pipes S, S ... S from the beginning to the end of the injection, or depending on the target injection region, the injection liquid may be injected earlier. There is also a branch pipe S that completes and ends the injection. However, when a part of the branch pipes S, S ... S has finished the injection, this injection amount remains for the other branch pipes S, S.
..Since it is distributed to S, the remaining branch pipes S, S ... S
The amount of discharge from is increased. In order to prevent this, it is necessary to adjust the inverter of the pump to reduce the rotation speed, and it is difficult to adjust the injection pressure P ₀ to a predetermined value.

Therefore, as shown in FIG. 24, a liquid delivery pressure gauge P ₀ and an injecting liquid return device RA are provided in the liquid delivery system F reaching the narrowed portion T _r of the injecting liquid to maintain a predetermined injecting pressure P ₀ . As described above, the flow rate pressure control device C controls the return device RA to return a part of the injection liquid to the injection liquid tank T through the return pipe R. As a result, the pressure in the liquid supply system F is maintained at a predetermined pressure and the injection of a predetermined flow rate from each branch pipe S, S ... can do.

Further, in FIG. 24, the injection pressure P _{0 is set} by the injection liquid return system RS from the start to the completion of the injection.
To an arbitrary value to automatically return the infusate,
It is also possible to arbitrarily obtain the discharge amount corresponding to the injection pressure P ₀ and the number of operating branch pipes S, S ... S.

FIG. 25 is a flow sheet of another specific example of the injection liquid return system RS used in the present invention, in which a plurality of pumps 18 are used in parallel to increase the injection pressure P ₀ or a very large number of injections are made. Can be infused simultaneously from the line. As a result, the present invention enables rapid construction by installing several tens or 100 or more branch pipes S, S ... S in the ground at one time. For example, 1 to 5 l per discharge port
Permeation between soil particles is possible due to the low discharge rate of / min. That is, when 100 ejection ports are simultaneously injected as one ejection port 31, an injection pump of 300 l / min is required. However, there is currently no chemical injection pump of 300 l / min. However, by using the apparatus shown in FIG. 25, it is possible to set 10 sets of 10 30 l / min chemical solution injection pumps as one set and inject from 100 discharge ports at once. Moreover, by using this injecting liquid return system RS, a constant amount of pressure P ₀ can be applied to a predetermined amount even if the number of discharge ports varies from a large number of discharge ports without adjusting the discharge amount of each pump. It is possible to automatically continue the injection with the discharge amount of, and by using the above-mentioned return device, it became possible to put such an epoch-making injection method into practical use.

FIG. 26 is an explanatory view of a ground injection device according to the present invention using another type of injection liquid return system RS. The delivery pressure gauge P ₀ is arranged in the delivery system before or after entering the distribution apparatus 26, and the injection solution return apparatus RA is disposed in the delivery system F after passing through the distribution apparatus 26, but both are restricted. It is installed in the liquid feeding system F to the section T _r .

The return device operates continuously during the injection, and the flow rate pressure control device which has received the signal from the liquid sending pressure gauge instructs the injection liquid return device to divert and return the injection liquid, and the pressure in the distribution device is returned. To control the discharge amount. further,
Controls the pressure in the distributor by receiving the signal from the branch flow meter,
Control is performed so that the discharge amount of the most appropriate branch pipe is obtained. In addition, even if a part of the branch pipe finishes the predetermined injection and then the injection is stopped, the remaining branch pipes can be injected with the same discharge amount to the last one.

FIG. 27 shows an example of the ground pouring device according to the present invention using a cylindrical annular distributing device. In general, the distributor exhibits an excessive pressure immediately after pumping the injection liquid into the distributor, which makes it difficult to operate. On the other hand, as shown in FIG. 27, an injection liquid return system RS, that is, a liquid supply pressure gauge P ₀ , an injection liquid return device RA, a return pipe line R, and a flow rate pressure are connected to the liquid supply system F reaching the throttle portion T _r. By providing the control device C, the injection pressure P ₀ is gradually increased while the pump 18 is started in the normal operating state, and the injection pressure is grasped while grasping the discharge amount from the branch pipes S, S ... S. By setting P ₀ , the injection operation can be performed safely and easily. In such a cylindrical annular distribution device, the pressure in the distribution device is evenly distributed, so that the discharge amount to each branch pipe is accurate. The liquid delivery pressure gauge P ₀ can also be provided in the distribution device.

FIG. 28 shows an example of the ground pouring device according to the present invention which uses a throttle control valve as the throttle portion T _r , specifically a throttle control valve T _r . Generally, in FIG. 28, when the pressure of the pressurized injection liquid in the distributor 26, that is, the injection pressure P ₀ is constant and the cross-sectional area of the throttle portion T _r is constant, each branch pipe S,
The flow rate of S ... S is almost always constant. On the other hand, the ground pressure P _f increases during the injection, if the lower the discharge amount f _i want injection remains low, the area of the throttle portion for each branch pipe by using a control valve T _r throttle as a throttle portion T _r Adjust
It becomes possible to adjust the injection pressure and the injection amount to correspond to the injection pressure.

That is, the flow rate pressure control device C receives the signals of P _i and f _i from the branch pipes S, S ... S and sends the signals to the throttle control valve T _r to adjust the valve opening. The cross-sectional area of the narrowed portion T _r is adjusted. As a result, the injection pressure P ₀ and
It is possible to adjust the pressure P _i and the flow rate f _{i according} to the adjusted cross-sectional area of the throttle portion T _r , and to inject appropriately.

In addition to this, as a method of varying the discharge amount in each branch pipe during the injection step, it is necessary to replace the orifices with different opening areas or to arrange the orifices with different opening areas in parallel. It is also possible to adopt a method such as switching the circuit to one of them or opening a plurality of orifices to one branch pipe at the same time.

FIG. 29 shows an example in which an injection liquid return device RS is attached to the ground injection device shown in FIG.
₀ , the injection liquid return device RA is the distribution device 26 as described above.
Is installed in the liquid delivery system. In this case, the pressure / flow rate control device integrally controls a plurality of liquid feeding systems. In the present invention, a plurality of injection devices (A
It is also possible to inject the liquid, the liquid B, etc.) through a plurality of branch pipes or injection pipes, respectively, or to discharge the liquid from the tip of the injection pipe to cause a confluent reaction in the ground to inject.

As the injection conduit 19 used here, various kinds of injection conduits are used.
1, 32, 33, 34, 35, 36.

The injection conduit 19 of FIG. 30 is composed of a plurality of thin tubes 28, 28.
28 is a bundling injection tube configured by bundling 28 through fixing plates 29, 29. The fixing plate 29 may be a binding band. Each thin tube 28, 28 ... 28 has a tip discharge port 30, 30 ... 30
Are respectively opened at different positions in the axial direction, and the rubber sleeves 31, 31 ...
The sleeve grout 33 is installed and injected into the injection hole 32.
It is installed in the ground 27 so as to be buried inside. The liquid injected from the discharge port 30 breaks the solidified sleeve grout 33 and
Infiltrated and injected into 27. The rubber sleeve 31 and the sleeve grout 33 do not have to be used.

The injection conduit 19 of FIG. 31 is composed of a plurality of thin tubes 28, 28.
..Bundling 28 with band 34 and a plurality of bag packers 35,
35 ... 35 is configured by mounting at intervals in the axial direction. Then, the thin tube 28 is bound by a band 34 so that the tip discharge port 30 is located inside the bag packer 35 and between the bag packers 35, 35, respectively. Ground such an injection line 19
When installing on the bag 27, first, insert the bag packer 35 into the injection hole 32 without inflating it, and then insert it into the bag packer 35 through the thin tube 28 from the discharge port 30 to solidify the bag packer 35 by inflating it and water. The bag packer 35 is inflated by being filled with various fluids such as muddy water and inert gas such as air nitrogen gas. Furthermore, the injection liquid is discharged from the discharge port 30 and the bag packer
The injection liquid permeates and injects into the ground 27 from the space 36 between the 35 and 35.

The injection pipe 19 of FIG. 32 is a double pipe double packer injection pipe line and is composed of an inner pipe 19A, an outer pipe 19B and a narrow pipe 28. The inner tube 19A is separated from the top and bottom by a packer.
37, 37 are provided, and the inner pipe discharge port 30A is provided between them. First, the injection pipe line 19 is inserted into the injection hole 32 of the ground 27, and then from the discharge port 30A of the inner pipe 19A to the bag packers 35, 35 ...
35 is filled with hardened material and expanded, and bag packers 35, 35 ...
Form 35. In this state, the ground injection material is injected into the ground 27 from the discharge port 30A of the thin tube 28 to solidify the ground 27. Although the discharge port 30 of the outer tube 19B is provided between the bag packers 35, 35 that are vertically adjacent to each other, this is not always necessary. It should be noted that through this outer pipe discharge port 30, a water permeation test of the ground 27 can be performed after the injection, and if the result of the test is that the injection is insufficient, the injection material should be re-injected from the discharge port 30 of the outer pipe 19B. You can also

In the injection conduit 19 of FIG. 33, (a) is the tip discharge port.
A single pipe having 30, (b) an inner pipe 19A and an outer pipe 19B, and a double pipe having an inner pipe discharge port 30A and an outer pipe discharge port 30B at the tip, (c) an inner pipe 19A, an outer pipe 19B And middle tube 9
It is a triple pipe made of C and having an inner pipe discharge port 30A, an outer pipe discharge port 30B and a middle pipe discharge port 30C. Arbitrary plural pipelines may be provided in parallel in the outer tube, and the discharge ports thereof may be provided at different positions in the axial direction of the outer tube.

These injection pipes 19 are bored while boring.
It is installed at a predetermined position of 27, and the injection pipe is moved after each injection of a predetermined injection stage, and finally pulled up to the above-ground part. It is possible to inject a plurality of chemical liquids constituting the injecting liquid into the flow paths formed in the above-mentioned multiple pipe to inject the injecting liquids having different gelation times into the ground. In the present invention, this injection is called a multi-tube injection method.

FIG. 34 shows a double pipe double packer method.
The injection tube 19 is composed of an inner tube 19A and an outer tube 19B. The inner tube 19A is provided with packers 37, 37 which are vertically separated from each other at the tip portion,
An inner pipe discharge port 30A is provided on the side wall between these packers 37. The inner tube 19A is a packer 37, and the outer tube 19B is composed of 37 parts.
It can move up and down while sliding on the inner wall of the. The outer tube 19B has a plurality of discharge ports 30, 30 ... 30 in the axial direction,
Each is covered by a rubber sleeve 31.

The inner pipe may be a single pipe, a multiple pipe or a parallel pipe of a plurality of pipes, and the packers may be provided at two positions above and below or more. The injection method using these injection tubes is expressed as a multi-tube triple packer method in the present invention, including the double-tube double packer method.

The multi-pipe multi-packer injection pipe line 19 having the above-described structure is inserted into the injection hole 32 formed in the ground 27, and the sleeve grout 33 is filled in the injection hole 32 and solidified to solidify the ground 27. It is installed inside.

When injecting the injection liquid, first, the inner tube 19A is moved so that the discharge port 30 at the lowermost end of the outer tube 19B is located between the upper and lower packers 37, 37 of the inner tube 19A, and then the inner tube 19A is passed through. The injection liquid is introduced, penetrates into the ground 27 from the inner pipe discharge port 30A through the discharge port 30 of the outer pipe 19B, breaks the sleeve grout 33, and is injected.

Next, the next outlet 30 of the outer tube 19B is packed.
The inner pipe 19A is pulled up until it is located between 37 and 37, the injection liquid is permeated into the ground 27 in the same manner as described above, and this operation is repeated until the discharge port 30 at the uppermost end is reached, and injection is completed. The outer pipe 19B is buried in the ground 27.

The injection line 19 of FIG. 35 is also the same as above.
The double pipe double packer injection pipe line is composed of an inner pipe 19A and an outer pipe 19B. The inner tube 19A is provided with packers 37, 37 vertically separated from each other at its tip portion, and an inner tube discharge port 30A is provided on the side wall between these packers 37, 37, and operates in the same manner as in FIG. At the time of injection, the bag packer 35 is filled with the hardened material in the same manner as in FIG. 32 to expand the bag packers 35, 35 ... 35 to form the packers 35, 35. Next, the upper and lower bag packers 35, 35
The injection material from the outer pipe discharge port 30 between
Inject. The injection method using the injection tube of FIG. 35 is also referred to as a multi-tube multipacker method in the present invention.

The injection line 19 of FIG. 36 is a plurality of injection lines in one injection line, for example, three injection lines 19a, 19b, 19c.
Are provided so that these discharge ports 30, 30, 30 respectively open at different positions in the axial direction. These discharge ports 30, 30, 30 are covered with rubber sleeves 31, 31, 31, respectively.

The injection pipe shown in FIG. 36 may be buried in the ground. Alternatively, a boring machine may be attached to the tip of the injection pipe to excavate the product to a predetermined depth for injection, and then the injection pipe is pulled up and recovered. You may. In addition, a metal crown for drilling is attached to the tip, and it is an injection pipe having a plurality of conduits inside, and a part of the plurality of conduits in the injection pipe is filled with a fluid such as air, an inert gas, or water. Through, cover the discharge port with an elastic body such as rubber, pressurize the fluid and expand it to act as a bag packer, and use the other conduits as the injection liquid injection flow path or drilling water flow path. It may be an injection tube for injection. In the present invention, the method of using this injection pipe is classified as a multi-tube injection method.

The ground injection method for injecting the ground injection liquid into the ground through a plurality of injection pipes installed in the ground by using the ground injection apparatus according to the present invention and consolidating the ground will be described in detail below.

The above-mentioned ground injection method is, for example, as shown in FIG.
As shown in FIG. 23, injection liquid pressurization for pressurizing the injection liquid
Part Y and the pressurizing part Y are connected to each other, and
Branch valve V leading to injection lines 19, 19 ... 19₁, V
₂... V_i, V_n, And branch flow meter f as required
₁, F₂... f_i, F_nAnd branch pressure gauge P₁, P₂・ ・
・ P_i, P_nEither one or both
It has several branch pipes S, S ...
The pressurized injection liquid of is distributed to each branch pipe S, S ...
Injecting liquid distribution section Z for supplying liquid to inlet pipes 19, 19 ... 19
Delivery of pressurized injection liquid from the injection liquid pressurization unit Y to the injection liquid distribution unit Z
System A, that is, the liquid flow meter f provided in the conduit 27₀And
And / or delivery pressure gauge P₀And the liquid flow meter f₀and/
Or liquid pressure gauge P₀, Injection pressurizing unit Y, branch valve
V₁, V₂... V_i, V_n, And branch flow meter f₁,
f₂... f_i, F_nAnd branch pressure gauge P₁, P₂... P
_i, P _nOne or both of them and their respective signal circuits
Operation panel X2, injection recording panel X3 and
And data input device X4 are connected to injection monitoring board X1
An apparatus having a control unit X to be used is used.

[0113] Incidentally, the branch valve V1` _n is not necessarily required and may not necessarily be connected by a signal circuit. Further, as the distributor 26 of the injection liquid distributor Z, the device shown in FIGS. 3 to 13 using the flow rate control valve A of FIG. 1 or the distributor valve B of FIG. 2 of the present invention is used.

In the above ground injection device, as shown in FIG. 17 or 23, the pressurized injecting liquid distributor 26 in the injecting liquid distributor Z is connected to the liquid sending system A (conduit 27).
In this case, the respective branch pipes S, S ... S are provided so as to extend from the distribution device 26, respectively, and the pressurized injection liquid from the pressurizing section Y is transmitted through the distribution device 26 to the respective branch pipes S, S. ..Distribute to S

The operation panel X2 of the control section X, the injection recording board X3 and the data input device X4 are built in the control section X and connected to the injection monitoring board X1, or the control section is provided from outside the control section X by a signal circuit. Connected to X.

Using the above-mentioned ground injection device, first, the pressure of the liquid supply system, the discharge amount from the branch pipe, and the diversion return of the injection liquid by the return device are controlled by the pressure flow control device. Set the predetermined pressure of. Next, according to the desired set values of the branch flow meters f ₁ , f ₂ ... F _i , f _n and / or the branch pressure gauges P ₁ , P ₂ ... P _i , P _n , that is, the ground condition. The desired setting value or limit range is stored in the data input device X4 of the controller X.

Further, the liquid flow rate meter f ₀ and / or the liquid pressure meter P ₀ , or the branch flow meters f ₁ , f _2, ...
f _i , f _n and / or branch pressure gauges P ₁ , P ₂ ...
The data during injection from P _i and P _n are converted to the respective branch pipes S, S ...
・ Sequentially record every S on the injection recording board X3 of the control unit X.

Branch flow meter f₁, F₂... f_i, F_nOh
And / or branch pressure gauge P₁, P₂... P_i, P_nof
When the data reaches the set value or exceeds the set value,
The injection monitoring board X1 of the control unit X indicates that the specified limit range has been exceeded.
Indicates that each branch pipe is operated by the operation panel X2 of the control unit X.
S, S ... Branch valve V for each S₁, V₂... V_i,
V_nTo close the injection to end the infusion, or if necessary,
Adjust the return device by the control unit X to adjust the pressure of the liquid sending system.
Control and adjust the discharge amount or pressure of the branch pipe
Injection amount from branch pipe and / or branch pressure gauge
P₁, P₂... P _i, P_nHas reached the set value
Or exceeds the set value, repeat the same operation to inject
Do.

As described above, the liquid flow rate meter f₀And send
Liquid pressure gauge P₀Information is sent to the control unit X, and based on that information,
Based on this, the control unit X instructs the injection liquid pressurizing unit Y to return the device.
To adjust the optimum injection speed F₀, Injection pressure P₀Will be
Can be controlled. That is, FIG. 17 or
As shown in FIG. 23, the branch pipes S, S ...
Branch flow meter f₁, F₂... f_i, F_nAnd branch pressure
Total P₁, P₂... P _i, P_nAnd control that information
Injection speed f transmitted to the part X within a predetermined range₀, Injection pressure
P₀It is of course possible to inject a pressurized infusion solution with
When there is a change in the ground conditions or the vertical outlet
It is possible to inject in the same manner when injecting simultaneously from.

In the above operation, a manual operation may be performed if necessary. In addition, for a branch pipe that has finished injection after reaching a predetermined amount, or for a branch pipe that has completed injection because the injection pressure reached a limit value, even if the branch valve is closed, the return device automatically leaves the same discharge amount. Since it continues to flow into the branch pipe, the condition of the pressurized injection liquid does not change even if the injection is partially completed. Therefore, even if the injection pressurizing unit Y is not adjusted, the injection is achieved under the same conditions until the injection of all the branch pipes is completed.

In this case, as shown in FIG. 22, when the injection of the branch valves V ₁ , V ₂ , V ₃ ... V _i , V _n is completed, the branch pipes S, S. Connection part 20,
20 ... 20 from the first injection block to another injection block,
That is, it is possible to switch to the injection conduit of the second injection block and continue the injection as it is.

In the ground injection method of the present invention, the injection liquid is injected into the injection stage of approximately the same depth through the plurality of injection conduits 19, 19, ... 17-like solidified layer, that is, the first improved block shown in FIG. 17 is formed, and this injection is repeated. For example, a plate-shaped solidified layer, that is, the second improved block is further formed on the lower layer to form a laminate. And

In the present invention, the term "substantially the same depth" means, for example, in the case of tunnel excavation work in which the injection is performed in the horizontal direction, the injection depths of the injection pipe lengths that are almost the same in the horizontal direction. In the present invention, the first improved block and the second improved block may be provided in the vertical direction as shown in FIG. 17 or the like, or may be provided in the horizontal direction as shown in FIG.

Further, as shown in FIG. 17, when the ground conditions for each block in the horizontal direction are almost the same, a simple device without a branch pressure gauge or a branch flow meter is used to measure almost the same soil layer or depth. Simultaneous injection can be performed by simultaneously injecting from a plurality of injection conduits that are spaced apart in a plane. In this case, the average injection speed of each injection line in the improved block is controlled, and the total injection amount is also controlled.
A plurality of injection pipe lines 19, 19 ...
·······································································································································.

More specifically, the soil layers generally have the same hydraulic conductivity in the horizontal direction. Under such ground conditions, the hydraulic conductivity is larger in the horizontal direction than in the vertical direction. Utilizing this, an improved block is assumed in the horizontal direction as shown in FIG. Then, if a plurality of discharge ports are installed in this assumed improvement block and the injection is performed simultaneously, it is possible to obtain almost f ₀ / _n (f ₀ in the liquid delivery flow meter from each discharge port without measuring the flow rate of each pipeline). The flow rate per minute is shown). In this case, even if the injection amount of some of the discharge ports becomes small due to the variation of the soil layer in the horizontal direction, the injection amount will be automatically distributed to the other discharge ports, and as a result, the entire block will be affected. A fixed amount of injection is made and the whole is consolidated homogeneously. In this case, as shown in FIG. 21, it is possible to confirm by providing a branch flow meter and a branch pressure gauge in some of the branch pipes.

In this way, by taking an injection stage for each soil layer and stacking the solidified layers, for example, from top to bottom,
Even if the injection in the upper part is insufficient, a part of the injection liquid in the improvement block in the lower part is automatically transferred to the insufficient consolidating part in the upper part, and the improvement can be made evenly as a whole. Then, when the improvement block is completed, then, the connecting portion 20 at the tip of the branch pipe S is connected to a plurality of injection pipe lines provided in another supposed improvement block and injected, and this operation is repeated to sequentially form the improvement block. And improve the ground for all consolidation.

FIG. 22 shows an example in which the connecting portion 20 of the branch pipe is connected and changed to another improved block. In this example, when the injection of the first injection block is completed at the same depth, the connection is changed to the injection conduits of the other second injection blocks, and the depth is sequentially moved downward.

The principle of the pouring method is to replace the water in the pores of the soil particles with the pouring liquid. For this reason, in the simultaneous pouring method, even when pouring into a large amount of soil from multiple outlets at the same time, if the underground water loses its escape area due to the pouring liquid, a pocket of water will be created in the ground, or the pouring liquid will be water. It is diluted and the target injection cannot be achieved. In order to prevent this, the present inventor, for example, as shown in FIG. 37, the assumed improvement blocks (1), (2), (3), (4) having substantially the same soil condition on the soil 27 to be consolidated. ), (5), and at the same time, from a plurality of discharge ports (not shown), first, at the same time, the assumed improved blocks (1) and (2), which are defined at intervals, are simultaneously injected to remove groundwater outside the block, and then, Simultaneous injection into the assumed improved blocks (3), (4), and (5) in the same manner as above to remove groundwater outside the block, and sequentially solidify the whole to solidify almost the same soil layer while allowing groundwater to escape. I found out what to do. 38 shows an example in which the whole is solidified in multiple layers in the same manner as in FIG.

In FIG. 20, a plurality of thin pipes 28, 28 ... 28 shown in FIG. 2 using the distribution valve B of FIG. 2 and the distribution device 26 arranged as shown in FIG. 13 and comprising a control unit, an injection liquid pressurizing unit, and an injection liquid distribution unit configured as shown in FIG. An example of ground injection using is shown.

The injection pipes 19, 19 ... 19 have respective discharge ports 30, 30 ... 30 at different positions in the axial direction respectively located at the first to n-th stages having different soil layers in the ground 27. As the ground
Installed in 27.

In general, since alluvial deposits are horizontally accumulated, the hydraulic conductivity in the horizontal direction is larger than that in the vertical direction. Therefore, in FIG. 20, the soil layer of the first stage has almost the same hydraulic conductivity near any discharge port, for example, medium sand, and the soil layer of the nth stage has almost the same hydraulic conductivity near any discharge port. So, for example, fine sand. In FIG. 13, six distribution valves B in FIG. 2 are shown.

When performing ground injection using the apparatus shown in FIG. 20, for example, prior to the injection in the first stage, a water injection test or an injection test with an injection solution having a long gelation time is performed, and P shown in FIG. A -q curve (curve 1), that is, P (injection pressure P) -q (injection rate or flow rate 1 / min) curve is generated. FIG. 39 is an injection pressure-flow rate (injection amount per minute) curve. In FIG. 39, the injection speed and the injection pressure are in a proportional relationship up to the O ₁ point, so that ground penetration does not occur and complete infiltration injection is performed. However, the injection speed and the injection pressure are not in a proportional relationship up to the O ₁ -O ₂ points, and although partial cracking occurs, there is no decrease in the injection pressure at which the ground breaks and the injection liquid deviates. The injection pressure at the O ₂ point is the limit injection pressure P _r0 , the limit water injection speed (or the limit injection speed).
(Flow rate) q _r0 . In this way, the limit injection pressure P _r0 and the limit injection flow rate q _r0 (injection speed) at which the ground breaks
You can know.

Also, unlike the water injection test, the chemical solution is injected.
In this case, the ground is strengthened as the injection proceeds. Figure 2
In 9, F₁There is a linear relationship up to the point, F₁~ F₂
It is not a straight line up to the point, but has not been destroyed. Shi
Therefore, F₂P at the point _rfThe limit pressure, q_rfLimit note
Use the incoming flow rate. In this way, the final limit injection pressure
And the limit injection flow rate (injection speed) are P_rfand
q_rfAnd set the design injection amount (integrated injection amount)
It will be done within this limit. These values are sent to the control
Remember, and when this design dose is injected,
If the design injection amount is not reached, this limit
When the input pressure is reached, the injection is terminated at that point.

The soil layer of the first stage has almost the same water permeability, but q of each of the ejection ports 1 to n has some variation. Therefore, the time required to complete the predetermined injection at each ejection port is different. For this reason, a predetermined electromagnetic valve is activated and turned off sequentially from the ejection port where the instruction from the control unit X and the injection are completed. (It may be a manual valve instead of an electromagnetic valve). Even if some valves are closed, the flow rate from the remaining outlets is kept the same by the return device.
Of course, depending on the case, the return device may be adjusted by an instruction from the control unit or the injection speed may be adjusted by adjusting the inverter.
The injection pressure can be adjusted.

In this manner, permeation consolidation by simultaneous injection from the discharge port is achieved in a plane for each stage to form a slab. This solidified layer is continuously formed from the first stage to the nth stage. Furthermore, the osmotic consolidation by simultaneous injection from the discharge port can be formed in the vertical direction, and further, can be made to proceed in both the horizontal direction and the vertical direction at the same time. It is also possible to selectively inject through a discharge port or a discharge port opened in a portion having high water permeability. Further, in FIG. 20, it is of course possible to simultaneously inject the liquid feed valves V _{01 to} V _0n .

FIG. 21 shows another embodiment of the injection device using the device of the present invention, in which the injection liquid distributor Z is combined with the flow control valve A of FIG. 1 and the distributor valve B of FIG. This is an example in which a plurality of distribution devices 26 are installed in parallel, and the branch pipes of each distribution device 26 are made to correspond to each injection stage.It is suitable for injection of almost the same ground conditions in the horizontal direction, and ground improvement is simple Becomes Hereinafter, this device will be described in detail.

First, as in the case of FIG. 20, a plurality of injection pipes constituted by bundling a plurality of thin tubes 28, 28 ... 28 shown in FIG. 20 as an injection pipe T are installed in the ground 27. This injection conduit is installed in the ground 27 so that the discharge ports 30, 30 ... 30 at different positions in the axial direction are located at each of the first to nth stages of different soil layers in the ground. When the soil conditions in the horizontal soil layer are almost the same, only one of the n branch pipes may be provided with a branch flow meter and a branch pressure gauge as a representative.

The injection pressurizing section is operated to simultaneously deliver the injection liquid from the distribution device 26 through the thin pipe 28 of the injection pipe in which the discharge port 30 is located at the first stage, and through the injection pipes T _{11 to} T _n1 . Inject into the first stage. As the injection progresses, the injection of the total injection amount Q _{1 at} the discharge port in the first stage reaches the limit injection pressure P _1f.
If the injection can be made within the above range, the injection of the first stage of the first injection block is terminated, the connecting portion of the branch pipe is connected to the injection pipe line of the second block, and the injection is transferred to the first stage of the second block. Completes the first stage of all injection blocks.

The above steps were sequentially repeated to complete the implantation from the first stage to the nth stage in all the implantation blocks. In the above, when the characteristics of the ground are two-dimensionally different, or when it is necessary to accurately grasp the injection pressure and flow rate in each injection pipe, or as shown in FIG. 20, the injection is performed simultaneously from a plurality of vertical discharge ports. If
It is desirable to provide a branch flow meter and a branch pressure gauge for each branch pipe.

An example of this case will be described with reference to FIG. 22. In the injection in the first stage of the first block, one of the injection pipes of T _{11 to} T _n1 is injected at a predetermined injection amount earlier than the other. Each time the injection is completed or the limit injection pressure is reached, the connection part of the branch pipe is continuously connected to the predetermined injection pipe line of the second injection block to repeat the connection. Infusion can be continued.
By repeating the above steps up to the n-th stage of each injection block, rapid construction can be easily performed. Note that FIG.
Although not shown in the drawing,
An injecting liquid return system RS can be provided in the liquid feeding system to the distributor.

Here, the injection liquid applied to the present invention and its application method will be described below.

In the present invention, if the gel of the injecting liquid adheres at the narrowed portion, it becomes difficult to obtain a predetermined discharge amount at a predetermined pressure. Further, when the injecting liquid is returned by the return device, even if the gelling time of the injecting liquid is long, the injecting liquid becomes highly viscous with the passage of time, and soon it becomes difficult to inject it into the ground.

As a result of various tests, the inventors of the present invention have found that water glass grout in the alkaline region as an injecting liquid tends to cause the above-mentioned problems. That is, the alkali content in the water glass increases the viscosity, so that the squeezed portion is likely to be clogged with gel before the gelation. Further, due to the high viscosity, the viscosity rapidly increases and gels while the injected liquid is returning.

On the other hand, the non-alkaline silica liquid obtained by neutralizing the alkaline component in the water glass with an acid has a low viscosity and a long gelation time, and therefore the gel does not adhere to the narrowed portion. . Further, since the gelation time can be set to ten and several hours, there is no concern that the solution will thicken and gel until the injection is completed even if the injection liquid is returned.

This is because a non-alkaline silica solution obtained by removing the alkali of colloidal silica or water glass with an ion exchange resin or an ion exchange membrane, or
The same applies to a non-alkaline silica solution obtained by removing acid radicals and alkali metal ions from an acidic silica liquid obtained by mixing water glass and an acid with an ion exchange resin or an ion exchange membrane.

More specifically, (1) water glass is mixed with sulfuric acid or phosphoric acid to obtain a pH of 0.5 to 0.5.
5. An acidic silica aqueous solution having a [SiO ₂ ] value of 0.5 to 3.4 is prepared. Such a silica solution has a gelation time of 1 hour to
It can be adjusted to dozens of hours, and it is 1.5 to 3.0 cp until just before gelation.
A low viscosity of s / 20 ° C. can be maintained, and the strength can be a uniaxial compressive strength of 1 to 8 kgf / cm ² with consolidated standard sand. Therefore, the injection device of the present invention can operate normally even if these injection liquids are injected while returning for several hours, so that the injection liquid can be said to be an extremely excellent injection liquid suitable for the device of the present invention.

Further, this acidic silica solution was used as the liquid A, the alkaline aqueous solution was used as the liquid B, and these two types of injecting liquids were sent by the liquid sending system according to the present invention and merged at the tip of the injecting conduit to form the ground. If it is injected into the ground, an injection liquid having a short gel time can be injected into the ground without clogging the device of the present invention with gel.

(2) Treatment of water glass with an ion exchange resin or an ion exchange membrane to remove the alkali and heating the resulting active silicic acid aqueous solution to stabilize the bond to a molecular weight of tens of thousands or more, and then to stabilize the SiO ₂ content. The colloidal silica is manufactured by concentrating it to 20 to 30 percent and stabilizing the pH value to about 9 to 10.

This colloidal silica solution was diluted to obtain Si.
The silica solution has an O ₂ content of about 0.1 to 20%. After adding a neutral property such as NaCl or KCl to this to adjust the gelation time to a dozen hours or more, it is injected into the ground.

Further, a non-alkaline silica solution having a pH value of about 0.5 to 6 obtained by mixing colloidal silica, water glass and an acid also has a long gelling time of a dozen hours and a high strength. A solidified body is obtained, which is an injection solution suitable for the device of the present invention. All of the above infusion solutions are solidified standard sand.
It exhibits a uniaxial compressive strength of 0.2 to 10 kgf / cm ² .

(3) Non-alkaline activated silica solution in which alkali content is removed by treating water glass with an ion exchange resin or an ion exchange membrane, or stable high molar ratio water glass in which a part of alkali is removed Are prepared and mixed with an acid to produce a non-alkaline activated silica solution.

Further, water glass is added to acidic activated silica obtained by dealkalizing water glass to prepare stabilized alkaline activated silica, and an acid is added to this to produce a non-alkaline activated silica solution.

Further, acid is added to water glass to obtain acidic water glass, which is treated with an ion exchange resin or an ion exchange membrane to produce a non-alkali activated silica solution.

Each of these non-alkaline activated silica solutions has a low viscosity (1.5 to 3.0 cps / 20 ° C.), a long gelation time of ten and several hours, and a SiO ₂ concentration of 1 to 1.
It is an injectable solution suitable for the apparatus of the present invention, which has a uniaxial compressive strength of 1 to 8 kgf / cm ² of standardized consolidated sand at 0 weight percent.

On the other hand, the water glass grout in the alkaline region is an aqueous solution of water glass as the solution A, and an aqueous solution of a reaction agent as the solution B (organic reaction agents such as glyoxal and ethylene carbonate, potassium bicarbonate, sodium bicarbonate, potassium chloride, etc.). Inorganic Reactant), and by using the two liquid-feeding systems to combine and react these solutions A and B in the injection pipe or in the ground, the throttling part is clogged with gel and increased by the return device. The present invention can be carried out without causing problems such as stickiness. Of course, the above-mentioned non-alkaline silica solution is liquid A, the gelling accelerator is liquid B, or water glass is liquid A, and the acidic reactant aqueous solution is liquid B. It can also be infused with a formulation.

[0156]

As described above, the ground injection device according to the present invention uses the flow control valve A, the distribution valve B, or a combination of these, so that a constant amount of ground is always maintained despite the pressure change in the ground. The injection material can be injected into the ground to rapidly and reliably improve a wide area of the ground.

[Brief description of drawings]

FIG. 1 is a sectional view of a specific example of a flow rate control valve used in the present invention.

FIG. 2 is a cross-sectional view of a specific example of a distribution valve used in the present invention.

FIG. 3 is a schematic view of a specific example of a ground injection device using a flow control valve according to the present invention.

FIG. 4 is a schematic view of a specific example of a ground injection device using a flow control valve according to the present invention in combination of series and parallel.

FIG. 5 is a schematic view of a specific example of a ground injection device using a plurality of flow control valves according to the present invention in parallel.

FIG. 6 is a schematic view of a specific example of a ground injection device in which a plurality of flow control valves according to the present invention are combined in series and in parallel.

FIG. 7 is a schematic view of a specific example of a ground injection device using a distribution valve according to the present invention.

FIG. 8 is a schematic view of a specific example of a ground injection device using a plurality of distribution valves in parallel according to the present invention.

FIG. 9 is a schematic view of a specific example of a ground injection device using a flow control valve and a distribution valve according to the present invention in combination in series.

FIG. 10 is a schematic view of a specific example of a ground injection device in which a plurality of flow control valves and distribution valves combined in series according to the present invention are arranged in parallel.

FIG. 11 is a schematic view of a specific example of a ground injection device in which a plurality of flow control valves and a plurality of distribution valves combined in series according to the present invention are further arranged in parallel.

FIG. 12 is a specific example of a ground injection device in which a plurality of distribution valves according to the present invention are combined in series and in parallel.

FIG. 13 is a specific example of a ground injection device in which a plurality of distribution valves according to the present invention are combined in series and in parallel.

FIG. 14 is an explanatory diagram of a specific example of an application example of the device of the present invention using an injection liquid return system.

15 is an explanatory diagram of another specific example of the injectate return system in FIG.

FIG. 16 is an explanatory diagram of another specific example using the injection liquid return system.

FIG. 17 is an explanatory diagram of another specific example of application of the device of the present invention.

FIG. 18 is an explanatory diagram of another specific example of the injecting liquid distributor of the device of the present invention.

FIG. 19 is an explanatory diagram of another specific example of the injection liquid pressurizing unit of the device of the present invention.

FIG. 20 is an explanatory diagram of another specific example of application of the device of the present invention.

FIG. 21 is an explanatory diagram of another specific example of application of the device of the present invention.

FIG. 22 is an explanatory diagram of another specific example of application of the device of the present invention.

23 is an application of FIG. 17 with an infusate return system.

FIG. 24 is an explanatory diagram of a specific example of the device of the present invention including an injection liquid return system.

FIG. 25 is an explanatory diagram of a specific example of the device of the present invention including an injection liquid return system.

FIG. 26 is an explanatory diagram of a specific example of the device of the present invention including an injection liquid return system.

FIG. 27 is an explanatory diagram of a specific example of the device of the present invention including an injecting liquid return system.

FIG. 28 is an explanatory diagram of a specific example of the device of the present invention including an injection liquid return system.

FIG. 29 is an explanatory diagram of a specific example of the device of the present invention including an injection liquid return system.

FIG. 30 is a cross-sectional view showing a specific example of the injection conduit of the injection part in FIG. 17, showing a state of being installed in the ground.

FIG. 31 is a cross-sectional view showing a specific example of an injection conduit provided with the bag packer of the injection part in FIG. 17, which is installed in the ground.

FIG. 32 is an example of a double tube double packer.

33 is another specific example of the injection pipe line of the injection part in FIG. 17, (a) is a single pipe, (b) is a double pipe, (c)
FIG. 4 is a cross-sectional view showing a triple pipe.

FIG. 34 is another example of a double-tube double packer.

FIG. 35 is a cross-sectional view showing still another specific example of the injection pipe line of the injection unit in FIG. 17, showing a state where the inner pipe of the double pipe is slid upward to perform injection.

FIG. 36 is still another specific example of the injection conduit of the injection part in FIG. 17, in which a plurality of injection conduits are provided in the injection pipe so that these discharge ports open at different axial positions. FIG.

FIG. 37 is a specific example showing a mode of forming a horizontal consolidation layer.

38 is a specific example showing a mode of forming a laminated consolidated layer of the consolidated layers of FIG. 37. FIG.

FIG. 39 is a graph showing the relationship between injection pressure and injection speed.

[Explanation of symbols]

A Flow control valve A liquid transfer system B distribution valve 1 valve body 2 entrance 3 exit 4 entrance passages 5 exit passages 6 Balance piston 7 entrance 8 Squeezing part (Olyphus) 9 springs 10 entrance 11 distribution outlet 12 valve body 13 entrance passage 14 Distribution port 15 Aperture 16 exit passage 17 spool 18 pumps 19 injection line 26 Distributor RS injection liquid return system RA injection liquid return device R return circuit C Flow rate pressure control device Tr throttle T injection tank F conduit (liquid delivery system)

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-57-81516 (JP, A) JP-A-54-94123 (JP, A) JP-A-2000-213665 (JP, A) JP-A-9-142193 (JP, A) JP 56-111713 (JP, A) JP 3-93916 (JP, A) JP 59-68424 (JP, A) JP 61-109819 (JP, A) Kaihei 9-291526 (JP, A) JP 2000-80663 (JP, A) JP 7-158051 (JP, A) Actual Kaihei 6-45198 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) E02D 3/12 101 C09K 17/12 C09K 103: 00

Claims (19)

(57) [Claims] 1. A ground injection device for injecting the ground injection liquid into the ground through a plurality of injection pipes installed in the ground to consolidate the ground, and an injection liquid pressurizing unit for pressurizing the injection liquid. , Having a plurality of branch pipes leading to the plurality of injection pipe lines,
An injection liquid distribution unit that distributes the pressurized injection liquid from the pressurization unit to each branch pipe through a distribution device and sends it to the injection pipe line. This distribution device has the following (A) or (B): Valve, or by combining the valves of (A) and (B)
The pressurized injection liquid from the injection liquid pressurizing unit through one liquid supply system.
And simultaneously injecting into the plurality of injection lines.
Ground injection device that. (A) a valve body having an inlet and an outlet for the injection liquid,
An inlet passage communicating from the inlet to the inside of the valve main body, an outlet passage communicating from the outlet to the inside of the valve main body, and an inlet opening incorporated between the inlet passage and the outlet passage so as to be movable along these passage directions and leading to the inlet passage. And a balance piston having a throttle portion that communicates with the outlet passage, and an elastic elastic body that is mounted in the outlet passage and biases the balance piston, and the inlet is throttled and opened by movement of the balance piston. Free flow control valve. (B) A valve body having an inlet of the injectate and a plurality of distribution outlets, an inlet passage communicating from the inlet to the inside of the valve body, a plurality of distribution ports communicating from the distribution outlet to the inside of the valve body, the inlet passage, and It is incorporated between a plurality of distribution ports so as to be movable in a direction crossing these passages, and has a throttle portion and an outlet passage, the throttle portion opens to the inlet passage and communicates with the outlet passage, and the outlet passages open to the respective distribution ports. And a spool communicating with the distribution outlet, and the plurality of throttle portions can be throttled and opened by the movement of the spool. 2. The liquid feed flow meter and / or liquid feed pressure gauge according to claim 1 , further provided in a liquid feed system for the pressurized injecting liquid from the injecting liquid pressurizing unit to the injecting liquid distributing unit, A liquid feed valve provided in the liquid feed system and / or a branch valve provided in the branch pipe, and the injection liquid pressurization based on information from the liquid feed flow meter and / or the liquid feed pressure gauge. One or two or more of the section, the liquid feeding valve and the branch valve are operated to simultaneously feed the injection liquid from one liquid feeding system to a plurality of injection pipes at a predetermined flow rate or pressure of the pressurized injection liquid. 2. The ground injection device according to claim 1 , wherein the liquid is injected as a liquid, or by connecting to another injection pipe line and then injected to improve the ground rapidly and surely over a wide area. 3. The liquid feeding pressure gauge and / or liquid feeding flow meter in the liquid feeding system of the pressurized injecting liquid from the injecting liquid pressurizing unit to the distributor of the injecting liquid distributing unit in claim 1 . An injecting liquid return device is provided, and the injecting liquid returning device divides the injecting liquid in the liquid feeding system from the liquid feeding system based on the information from the liquid feeding pressure gauge and / or the liquid feeding flow meter to send the liquid. The liquid pressure of the liquid system is maintained at a desired pressure, whereby the discharge amount of the injection liquid sent from each branch pipe to the injection pipe through the distributor is adjusted to a desired amount, and any of the plurality of branch pipes is adjusted. The ground injection device according to claim 1 , wherein the discharge amount of each of the remaining branch pipes is maintained at a predetermined amount even if the infusion is stopped. 4. A ground pouring device for pouring the ground pouring liquid into the ground through a plurality of pouring pipes installed in the ground to consolidate the ground, and the pouring liquid is passed through a squeezing portion to each of the pouring liquids. It is characterized in that the liquid is sent to an injection pipe and injected into the ground, and a liquid delivery pressure gauge and / or a liquid delivery flow meter and an injecting liquid return device are provided in a liquid delivery system that reaches the throttle portion of the injecting liquid. The injecting liquid return device divides the injecting liquid in the liquid feeding system from the liquid feeding system based on the information from the liquid feeding pressure gauge and / or the liquid feeding flow meter to thereby divide the liquid pressure of the liquid feeding system. Hold the desired pressure, thereby adjusting the discharge amount of the injection liquid sent to each injection pipe line through the throttle portion to a predetermined amount ,
A ground injection device characterized by simultaneously injecting an injection liquid from a plurality of injection lines . 5. The method of claim 4, narrowing part orifice injection nozzle, throttle valve or soil injection device according to claim 4, wherein the aperture adjustment valve. 6. The control unit according to claim 4 , further comprising a control unit, which is connected to a liquid delivery pressure gauge and / or a liquid delivery flow meter to receive information from these and to a return device based on this information. The ground injection device according to claim 4 , wherein an instruction is given, and the return device receives the instruction from the control unit and diverts the injection liquid from the liquid supply system so that the injection liquid being supplied maintains a predetermined pressure. . 7. A ground injection device for injecting the ground injection liquid into the ground through a plurality of injection pipes installed in the ground to consolidate the ground, and an injection liquid pressurizing section for pressurizing the injection liquid. , Having a plurality of branch pipes leading to the plurality of injection pipe lines,
An injection liquid distribution unit for distributing the pressurized injection liquid from the pressurization unit to each branch pipe through a distribution device and sending the injection liquid to the injection pipe line, and from the injection liquid pressurization unit to the injection liquid distribution unit. A liquid feeding pressure gauge and / or a liquid feeding flow meter and a liquid feeding returning device are provided in the liquid feeding system of the pressurized liquid to be fed, and the liquid feeding returning device is provided from the liquid feeding pressure meter and / or the liquid feeding flow meter. Based on the information of the above, by dividing the injection liquid in the liquid supply system from the liquid supply system, the liquid pressure of the liquid supply system is maintained at a desired pressure, whereby the branch pipes from the respective branch pipes through the distributor. Hold the discharge amount of the injection liquid sent to the
Simultaneously inject the injection liquid from multiple injection lines ,
Even if one of the multiple branch pipes stops the injection, the injection amount of each of the remaining branch pipes is maintained at a predetermined amount and multiple injection liquids are injected.
Ground injection device characterized by simultaneous injection from a pipeline . 8. The method of claim 7, injection pressing is ground injection apparatus according to claim 7 comprising a single or a plurality of pumps. 9. The injection liquid distributor according to claim 7, wherein the injecting liquid distributor has a throttle portion, and the throttle portion is an orifice, an injection nozzle, a throttle valve, a throttle control valve or a branch valve.
The ground injection device according to 7 . 10. The number of branch pipes and the flow passage cross section of the branch pipe according to claim 7 , wherein the pressure of the injection liquid in the distributor is higher than the pressure of the injection liquid in the injection pipe. The ground injection device according to 7 . 11. The method according to claim 7, wherein the total flow passage cross section of the branch pipe is smaller than the liquid delivery cross section of the distributor.
The ground injection device according to claim 7 , wherein the number of branch pipes and the flow path cross section are set. 12. The method of claim 7, ground injection apparatus according to claim 7 to at least one of the plurality of branch pipes provided branching flow meter and / or branched pressure gauge. 13. The control device according to claim 7 , further comprising a control unit, which is connected to a liquid delivery pressure gauge and / or a liquid delivery flow meter to receive information from these and to a return device based on this information. The ground injection device according to claim 7 , wherein an instruction is given and the return device receives the instruction from the control unit and diverts the injection liquid from the liquid supply system so that the injection liquid being supplied maintains a predetermined pressure. . 14. An injecting liquid pressurizing section for pressurizing the injecting liquid in a soil injecting method for injecting the injecting liquid into the soil through a plurality of injecting conduits installed in the soil and consolidating the soil. An injection liquid distributor having a plurality of branch pipes communicating with the plurality of injection pipes, and distributing the pressurized injection liquid from the pressurizing unit to the respective branch pipes through a distributor and sending the liquid to the injection pipes. A liquid feed pressure gauge and / or a liquid feed flow meter provided in a liquid feed system for the pressurized liquid to be injected from the liquid injector to the liquid distributor, and a liquid return device; The injection liquid is injected and pressurized using a ground injection device that is connected to a pressure gauge and / or a liquid flow meter and receives information from these and provides a return device with an instruction based on this information. When injecting into the ground from the injection part through the injection distribution part, this injection Is performed while instructing the return device to divide, and the liquid pressure of the liquid feeding system is maintained at a desired pressure, whereby the injection liquid sent from each branch pipe to the injection pipe through the distributor is The injection amount is maintained at a desired amount and the injection liquid is simultaneously injected from a plurality of injection pipe lines. Hold multiple injection solutions
The ground injection method is characterized by simultaneous injection from the injection line . 15. The branch flowmeter and / or the branch pressure gauge is provided in the branch pipe as a liquid feed pressure gauge and / or a liquid feed flowmeter of the ground injection device according to claim 14 , and is connected to a control unit. The control unit receives information from these and gives a return flow instruction to the return device based on this information, and at least one of the branch pressure gauge and / or the branch flow meter shows a predetermined value or is within a limit range. As described above, the return device is controlled to set the pressure and / or the flow rate of the liquid sending system within a predetermined range, and the value of one of the branch pressure gauges reaches a limit value during injection, or the value of the branch flow meter is set to a predetermined value. When the injection amount is reached, the injection from the branch pipe is stopped, or the return device is controlled so that the pressure and / or the flow rate of the liquid feeding system is set within a predetermined range so that the injection is repeated. 15. The ground injection method according to claim 14 . 16. The ground injection liquid according to claim 14, wherein a) is an injection liquid whose main component is a silica solution in a non-alkaline region obtained by removing alkali in water glass, and b) acid of alkali in water glass. The ground injection method according to claim 14 , which is selected from the group consisting of an injection liquid containing a silica solution in a non-alkaline region as a main material obtained by neutralization with c) and an injection liquid containing c) colloidal silica as a main material. 17. The method according to claim 14, wherein a plurality of ground injection liquids are sent by different liquid feed systems and merged in an injection pipe line, or a plurality of ground injection liquids are separately fed into the ground from a plurality of injection pipe lines. The ground injection method according to claim 14 , wherein the ground injection method is performed so as to merge into the ground. 18. The method according to claim 14, wherein the injection liquid is injected into an injection stage having substantially the same depth through a plurality of injection pipes installed in the ground to form a continuous plate-shaped solidified layer,
The ground injection method according to claim 14 , wherein the injection is repeated to form a laminate of plate-shaped injection layers. 19. The method of claim 18, ground grouting method of claim 18, wherein the injection layer is formed while relief groundwater.