JP2003313856A - Method of filling ground reinforcing chemical - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such problems with a method of filling a ground reinforcing chemical into a ground to reinforce the ground that the chemical must be replenished frequently and a large amount of empty containers are produced as industrial wastes. <P>SOLUTION: A filling machine 38 having a liquid feed pump and a main tank storing the ground reinforcing chemical are mounted on a vehicle 34, and the chemical in the main tank is fed to a delivery pipe inserted into the ground and discharged from the delivery hole of the delivery pipe to fill the chemical into the ground for solidification to reinforce the ground. In this case, the repeatedly usable and transportable chemical container 10 as the main tank is mounted on the vehicle 34 so as to be unloaded, and the chemical in the chemical container 10 is fed to the discharge pipe by the filling machine 38. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for strengthening the ground by injecting a chemical liquid for ground strengthening into the ground to solidify it.

[0002]

2. Description of the Related Art When excavating a tunnel, especially when excavating a tunnel on a soft ground (ground), a chemical solution is injected into the ground to fill the voids in the ground and solidify the ground. By solidifying or filling a large cavity created in the ground with a chemical solution and solidifying,
Conventionally, the ground has been strengthened.

FIG. 8 shows an example of the construction method. In the illustrated example, a long hole for injecting a chemical liquid is obliquely bored toward the inner part along the tip end face and the outer periphery during tunnel excavation, and a predetermined casing pipe, here, a steel pipe 200 is inserted into the long hole. The chemical solution is injected using the injector 204 mounted on the vehicle 202 to fill the chemical solution in the steel pipe 200, and the chemical solution is permeated through the holes provided in the steel pipe 200 in the ground around the steel pipe 200, and the solidification of the chemical solution is performed. Solidify the ground,
This is an example of a case where a roof 206 (see FIG. 9) is formed in a tunnel shape, and the lower side of the roof 206 is dug to the back. The steel pipe 200 inserted in the long hole is left in the tunnel as it is, and a concrete tunnel wall 208 is formed later as shown in FIG.

In this example, a two-liquid type polyurethane foam chemical is used as the chemical, and a first chemical such as water glass and a second chemical such as isocyanate are used as the main tank 210 for the first chemical in FIG. -1, Main tank 21 for the second chemical
Nos. 0-2 and 0-2, respectively, and the first chemical liquid and the second chemical liquid inside each are sent out by the injector 204, and they are supplied in a mixed state to the discharge pipe inserted into the inside of the steel pipe 200. The mixed chemical liquid (foamed polyurethane chemical liquid) supplied to the discharge pipe is discharged from the discharge hole of the discharge pipe to fill the inside of the steel pipe 200, and further leaches into the ground through the hole of the steel pipe 200 to solidify and strengthen the ground.

In this chemical injection method, the main tanks 210-1 and 210-2 each having a capacity of about 100 liters are conventionally used. In this case, the injection of the chemical into the ground immediately consumes the internal chemical. Will be done. Incidentally, in the case of the steel pipe 200 having a length of about 3 m, the total amount of the chemical liquid used in one injection is about 30 kg including the first chemical liquid and the second chemical liquid.

For this reason, in this construction method, a one-drop can 212-1 containing about 20 kg of the first chemical liquid and about 20 kg of the second chemical liquid, respectively.
Each of the 212-2 is loaded on a pallet of about 40 cans and transported to the site, and at the site, the worker A pierces the cans one by one and opens the 1-ton cans 212-1, 212-2 to open the vehicle 202.
It was necessary to manually replenish the main tanks 210-1 and 210-2 set in the above to frequently refill them.

[0007]

However, in the case of this pouring method, it is necessary to frequently perform the replenishment work of the chemical solution from the one-tower canisters 212-1, 212-2 to the main tanks 210-1, 210-2. Therefore, there is a problem that not only the worker B who operates the injector 204 but also the worker A who replenishes the chemical liquid is stuck to the vehicle. That is, a dedicated worker A for supplying the chemical liquid is required in addition to the worker B for operating the injector 204, which causes a problem that the cost is high and the chemical liquid supply cannot be automated.

[0008] In addition, empty cans are produced in large quantities as industrial waste at the tunnel excavation work site, resulting in a large amount of processing cost and a large load on the environment. This is a big problem. In addition, there may be some residual liquid in the empty empty can, and its treatment is also a problem.

The second chemical liquid such as isocyanate in the foamed polyurethane chemical liquid is treated as a dangerous substance, and the chemical liquid is transferred from the one-tower canister 212-2 to the main tank 210-2 as described above. Frequently, worker A has more opportunities to touch the dangerous materials,
In addition to being unfavorable from the viewpoint of safety, the worker A may be allergic to the drug solution in some cases.

Further, since the chemicals in the main tanks 210-1, 210-2 are immediately consumed, the chemicals in the main tanks 210-1, 210-2 are always in a proper amount and in a proper ratio. It is necessary to constantly monitor whether or not it is being replenished, and in addition to the problem that the work load due to it is large, it is also possible to use the one-toed cans from the factory to the work site.
When carrying 12-2, the safety is also a problem, especially when carrying the one-dose can 212-2 containing the second chemical liquid, which is a dangerous substance.

To solve this problem, a steel pipe 200 having a long length and a large thickness is used, and a plurality of discharge pipes having different lengths are inserted into the steel pipe 200, and a multiple injection type is adopted in which the chemicals are simultaneously discharged from them. This is a particularly big problem.

In this multiple injection method, a steel pipe 200 having a length of, for example, about 12 m is used, and a plurality of discharge pipes having different lengths, for example, three discharge pipes are inserted into the steel pipe 200, and the discharge holes are formed at the respective tip portions. At the same time, the chemical solution is discharged. In this case, the discharge amount of the chemical liquid for one time is, for example, about 150 kg in total of the first chemical liquid and the second chemical liquid, which is 5 times the above 30 kg.

In the case of this multiple injection method, it is possible to form the long roof 206 in the tunnel advancing direction by one injection of the chemical liquid, and thus the efficiency of the construction is improved, while the number of times of replenishment of the chemical liquid by the worker A is increased. The above problem becomes a greater problem in that the number of empty cans generated in a certain period of time increases and the number of empty cans increases in addition to a significant increase in load on workers.

[0014]

Means for Solving the Problems The method for injecting a chemical liquid for ground reinforcement of the present invention has been devised to solve such problems. According to the first aspect of the present invention, an injector including a liquid feed pump and a main tank containing a ground strengthening chemical solution therein are mounted on a vehicle, and the chemical solution in the main tank is ground by the injector. A method for injecting a chemical liquid for ground reinforcement for supplying to a discharge pipe inserted therein, discharging from a discharge hole of the discharge pipe, injecting and filling into a void or cavity of the ground and solidifying to solidify the ground, A drug solution container having a container for containing a drug solution and configured to be reusable and transportable is mounted as a main tank on and off the vehicle, and the drug solution in the drug solution container is discharged by the injector. It is characterized in that it is supplied to a pipe.

According to a second aspect of the present invention, in the first aspect, the chemical liquid is a two-liquid type polyurethane foam chemical liquid consisting of a first chemical liquid and a second chemical liquid, and at least the first chemical liquid and the second chemical liquid. One of the chemical liquids is supplied from the chemical liquid container to the discharge pipe by the injector.

According to a third aspect of the present invention, in any one of the first and second aspects, a plurality of the chemical liquid containers are mounted on the vehicle,
First, the internal chemical liquid is supplied from one of the chemical liquid containers, and when the inside becomes empty, the supply is switched to another chemical liquid container.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a chemical liquid container is provided on a passage of the chemical liquid from the chemical liquid container to the infusion machine for preventing the chemical liquid from running out when the container is switched. It is characterized in that a small capacity auxiliary tank is inserted, and the chemical solution is supplied from the chemical solution container to the infusion machine through the auxiliary tank.

A fifth aspect of the present invention is characterized in that, in the fourth aspect, the auxiliary tank has a capacity capable of accommodating the amount of the liquid chemical required for at least one injection operation.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a chemical liquid amount detecting means for detecting when the chemical liquid container supplying the chemical liquid to the vehicle is empty. It is characterized in that it is equipped with a chemical liquid management means including.

According to a seventh aspect of the present invention, in the sixth aspect, the chemical liquid management means notifies the worker by a display or an alarm when the chemical liquid amount detecting means detects that the chemical liquid container is empty. It is characterized by having a notification means.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, a leakage prevention tank is mounted on the vehicle, and the chemical liquid container is placed on the leakage prevention tank. When the chemical liquid leaks from the container, the leaked chemical liquid is received in the leakage prevention tank.

According to a ninth aspect of the present invention, in any one of the first to eighth aspects, the injection method includes a plurality of discharge pipes having different lengths, and the chemicals are discharged from different positions substantially at the same time to the ground. It is characterized by a strengthening method.

[0023]

As described above, according to the present invention, a drug solution container configured to be repeatedly usable and transportable is mounted on a vehicle so as to be able to get in and out of a vehicle, and the container is used as a main tank to discharge the drug solution inside by an injector. It is designed to be injected into the ground through its discharge pipe.

This chemical solution container has a larger capacity (for example, a capacity capable of accommodating 1 t of chemical solution) than the above-mentioned one-dose can. Therefore, according to the present invention, it occurs in the conventional injection method shown in FIG. It is possible to solve the above problem, that is, to load a large number of Ito cans in advance on a number of vehicles and frequently transfer chemicals from there to the main tank, thus significantly reducing the burden on workers. While you can
It is also possible to solve the problem that a large amount of empty cans are generated as industrial waste at tunnel excavation work sites and the like.

In some cases, it is possible to eliminate the need for a dedicated worker who replenishes the chemical liquid. It is possible to further automate the supply of chemicals, which in turn makes it possible to automate the injection of chemicals, and at the same time, it is possible to reduce the cost of processing industrial waste and the cost of injections of chemicals. Become.

In addition, since it is possible to eliminate the need to transfer the chemical liquid to the main tank by using the one-dose can as described above, the chemical liquid remains in the emptied one-dose can and the treatment thereof becomes a problem. In addition, since the worker does not have to transfer the chemical liquid frequently, the worker has almost no chance to touch it even when using a chemical liquid designated as a dangerous substance. be able to.

Further, according to the injection method of the present invention, the chemical solution can be filled in the chemical solution container at the factory, transported to the construction site and used as it is as the main tank, so that it is safe during transportation. In addition, since a large-capacity chemical liquid container can be used as the main tank, the worker frequently monitors the remaining amount of the chemical liquid of the first chemical liquid and the second chemical liquid during the injection work. This can also be omitted (when the two-liquid type chemical liquid of the first chemical liquid and the second chemical liquid is used as the chemical liquid), and in this respect as well, the burden on the worker can be reduced.

Further, for example, even if the chemical liquid is handled as a dangerous substance, this regulation can be easily satisfied by using the chemical liquid container, that is, by making the chemical liquid container a structure satisfying the regulations of the Fire Service Law. .

Here, the chemical solution container can be made of a metal pressure vessel (for example, pressure resistance of 1.9 kgf / cm ³ G or more). Further, the container can be made to have a large capacity of at least 1000 liters or more.

Further, the above chemical liquid container may be provided with a support frame for supporting the container, and further, the container may be provided with an outlet for letting out the internal chemical liquid, and the outlet may be piped. Can be connected. Further, the outlet may be provided with a valve for opening and closing the outlet. In addition, Japanese Patent Application No. 200 proposed by the present applicant as such a chemical liquid container.
2-064728 can be used.

In the present invention, it is possible to use, as the chemical liquid, a two-liquid type polyurethane foam chemical liquid consisting of a first chemical liquid and a second chemical liquid. In this case, at least one of the chemical liquids is discharged from the above chemical liquid container by an injector. It is possible to supply to (claim 2).

Further, a plurality of the chemical liquid containers are mounted on a vehicle, first the chemical liquid inside is supplied from any of the chemical liquid containers, and when the inside becomes empty, the supply is switched to another chemical liquid container. It is possible (claim 3). By doing so, it becomes possible to continuously supply a larger amount of the liquid medicine to the discharge pipe through the injector without replenishing the liquid medicine on the way.

When switching the supply of the chemical liquid from one chemical liquid container to another chemical liquid container, this may be performed manually or automatically.

Further, in the present invention, a small capacity auxiliary tank is provided on the passage of the liquid medicine from the liquid medicine container to the injector, and the liquid medicine is supplied from the liquid medicine container to the injector through the auxiliary tank. It is possible (Claim 4).

For example, it is possible to directly supply the liquid medicine from the liquid medicine container to the injector without interposing such an auxiliary tank. In this case, when the liquid medicine container becomes empty, air is supplied to the injector. There is a risk of being inhaled. If air is sucked into the injection machine, for example, in the case of the above-mentioned two-liquid type polyurethane foam chemical solution, the chemical solution may be hardened by the moisture in the air.

However, when the chemical solution is supplied from the chemical solution container to the injector through the auxiliary tank according to the fourth aspect, the chemical solution is supplied from the auxiliary tank to the injector even when the chemical solution container becomes empty. Therefore, it is possible to avoid the disadvantage that the air is sucked into the injector as it is.

It is desirable that the auxiliary tank has a capacity capable of accommodating the amount of chemical liquid required for at least one injection operation (claim 5). By doing this, at least the next 1
It is possible to perform the injection operation once, without interruption, and by supplying the chemical solution to the auxiliary tank from another new chemical solution container during that time, the injection operation can be continuously performed without interruption.

This auxiliary tank can be used to prevent the chemical solution from running out when switching the chemical solution supply from one of the plurality of chemical solution containers mounted on the vehicle at the same time to the other, and a single chemical solution container is mounted on the vehicle. Even when the liquid medicine container is mounted and another liquid medicine container is mounted on the vehicle when the liquid medicine container is empty, the liquid medicine supply can be continued and the liquid medicine can be prevented from running out.

Next, according to the sixth aspect, when the chemical liquid container supplying the chemical liquid becomes empty, the chemical liquid management means including the chemical liquid amount detection means for detecting the empty is mounted on the vehicle. It is a thing. By providing the chemical liquid amount detecting means in this way, when the chemical liquid container is emptied, it can be easily known by the chemical liquid amount detecting means, or the container based on the chemical liquid amount detecting means can be used. It is also possible to switch automatically.

In this case, the chemical liquid management means may be provided with a notification means for notifying the worker of this by means of a display or an alarm when the chemical liquid detection means detects that the chemical liquid container is empty (claim) Item 7). Thereby, the worker can know this by notifying by the notifying means even if the amount of the liquid medicine inside the liquid medicine container is not always monitored.

According to the present invention, the vehicle is equipped with a leakage prevention tank, and the above-mentioned chemical solution container is placed on the leakage prevention tank. If a chemical solution leaks from the chemical solution container, the leakage prevention tank is placed in the leakage prevention tank. Can be received (claim 8). According to the eighth aspect, even if the chemical liquid leaks from the chemical liquid container, it is possible to reliably prevent the leaked chemical liquid from leaking to the outside.

As is apparent from the above description, the present invention is particularly effective when applied to an injection method in which a plurality of discharge pipes having different lengths are provided and the chemicals are discharged from different positions at substantially the same time to strengthen the ground. It is great (Claim 9).

[0043]

EXAMPLES Next, the present invention is applied to a water glass type chemical solution (first chemical solution).
An embodiment in the case of applying a two-component type foamed polyurethane chemical liquid of an isocyanate chemical liquid (second chemical liquid) as a ground strengthening chemical liquid will be described in detail with reference to the drawings.

In FIG. 4, reference numeral 10 denotes a chemical liquid container for containing a second chemical liquid, which is a stainless steel and pressure resistant container 11
And a support frame 16 having a vertical frame member 12 at the corners and upper and lower horizontal frame members 14 to support the container 11 and a gas cylinder 20. Here, circular legs 18 are provided so as to project downward at the lower portion of the vertical frame member 12 at each corner.

The gas cylinder 20 is connected to the container 1 through a conduit 22.
The purpose of this is to guide the gas pressure into the inside of 1 to give the internal pressure (however, in this example, the addition of the internal pressure by the gas cylinder can be omitted). Reference numeral 24 is a regulator for adjusting the internal pressure applied to the container 11 to a predetermined internal pressure.

The container 11 is provided with a chemical solution supply port 2 on the upper portion thereof.
6 and a pressure gauge 28 are provided. Further, at the lower part, an outlet 30 for letting out the internal chemical solution and the outlet 30
A valve 32 for opening and closing the
A connection pipe 54 described later can be connected to 0.
The container 11 has a pressure resistance of 1.9 kgf / cm ³ G or more.

In FIG. 1, reference numeral 34 denotes a vehicle (truck) equipped with a chemical liquid injecting facility, and the two chemical liquid containers 10 for supplying the second chemical liquid and the tank 36 for supplying the first chemical liquid.
And an injector 38. In this example, the chemical liquid container 10 has a capacity to store 1 t of the second chemical liquid, and the tank 36 has a capacity to store 2000 liters of the first chemical liquid.

The tank 36 is provided with a stirrer 40 for stirring the first chemical liquid inside. This stirrer 4
0 has a stirring unit 42 and a drive unit 44 thereof. A suction pipe 46 extends from the tank 36, and a tip end portion of the suction pipe 46 is connected to the injector 38.
The chemical solution is sent to the injector 38 through the suction pipe 46.

In FIGS. 1 and 2, reference numeral 48 denotes a leakage prevention tank mounted on the vehicle 34, which has a rectangular box shape with an open upper surface as clearly shown in FIG. The leak prevention tank 48 is for receiving and containing the chemical liquid should the chemical liquid container 10 leak, and prevents the second chemical liquid from flowing out. It is placed on the prevention tank 48. In this example, the leakage prevention tank 48 has an internal capacity of about 220.
It is said to be 0 liter.

As shown in FIG. 3, a total of eight cylindrical receiving portions 50 are provided on the upper surface of the leakage prevention tank 48. The two chemical liquid containers 10 are placed side by side on the upper side of the leakage prevention tank 48 in a state where the legs 18 are fitted into the receiving portions 50.

Inside the leakage prevention tank 48, an auxiliary tank 52 having a smaller capacity than the chemical liquid container 10 is also installed. And this auxiliary tank 52 and two chemical liquid containers 1
The respective outlets 0 of 0 are connected to each other by a connection pipe 54. That is, the second chemical liquid in each chemical liquid container 10 is supplied to the auxiliary tank 52 through the connection pipes 54.

However, when the second chemical liquid is being supplied from one of the chemical liquid containers 10 to the auxiliary tank 52, the valve 32 of the other chemical liquid container 10 is closed, and one of the chemical liquid containers 10 can be selectively used. The second chemical solution inside is supplied to the auxiliary tank 52.

The auxiliary tank 52 has a capacity capable of accommodating an amount of the liquid medicine required for at least one injection. From this auxiliary tank 52, another connecting pipe 5
6 extends inside the leakage prevention tank 48, and its tip is connected to the suction pipe 58 outside the leakage prevention tank 48, and the second chemical liquid from the auxiliary tank 52 is injected through the connection pipe 56 and the suction pipe 58. It will be sent to 38.

An emergency shutoff valve 60 is provided at the connection between the connection pipe 56 and the suction pipe 58. The emergency shutoff valve 60 is an emergency valve that shuts off the supply of the chemical liquid if the second chemical liquid leaks from the chemical liquid container 10.

As shown in FIG. 2, the auxiliary tank 52
A liquid level tube 62 extends vertically upward from the liquid level tube 62 so that the liquid level of the second chemical solution inside the chemical solution container 10 connected to the auxiliary tank 52 appears on the liquid level tube 62. The liquid level tube 62 is fixed to a column 66 and is supported by the column 66.

The liquid level tube 62 is provided with a liquid level detection sensor 64 as a liquid chemical amount detecting means at a position lower than the bottoms of the pair of chemical liquid containers 10, and the liquid level in the liquid level tube 62 descends. Then, when the position of the liquid level detection sensor 64 is reached, the liquid level detection sensor 64 detects this. That is, the liquid level detection sensor 64 detects when the liquid medicine in the liquid medicine container 10 is empty.

When the liquid level detection sensor 64 detects that the chemical liquid container 10 connected to the auxiliary tank 52 is empty, that is, the chemical liquid currently supplying the chemical liquid to the injector 38. When it is detected that the container 10 is empty, an alarm 68 is issued under the control of the control unit to notify the worker that the drug solution container 10 currently being supplied with the drug solution has been emptied. It

Therefore, the worker can switch the supply of the second chemical liquid from one chemical liquid container 10 to the other chemical liquid container 10 by the alarm. The switching at that time is performed by closing the valve 32 of the empty chemical solution container 10 and opening the valve 32 of the other chemical solution container 10.

In FIG. 2, reference numeral 70 designates a liquid level tube 62, a liquid level detection sensor 64, an alarm 68, and a chemical liquid management unit (chemical liquid management means) including a controller for activating the alarm 68 based on the detection of the liquid level detection sensor 64. ) Is represented.

The injector 38 has a first pump unit 72-1 and a second pump unit 7 as shown in FIG.
It has 2-2, 3rd pump unit 72-3, and the control panel 74 which controls them in common.

As shown in an enlarged scale in FIG. 6, the first pump unit 72-1 includes a first pump portion 76-1 for supplying a first chemical liquid and a second pump portion 78 for supplying a second chemical liquid. -
1 and. These first pump section 76-1 and second
The pump unit 78-1 is operatively connected to a common drive motor 80, and the drive motor 80 allows the first drive motor 80 to
The pump part 76-1 and the second pump part 78-1 are activated and deactivated.

The other second pump unit 72-2 and third pump unit 72-3 are basically the first pump unit 7 as well.
It has the same structure as 2-1. The first pump parts 76-1, 76-2, 76-3 of the first, second and third pump units 72-1, 72-2, 72-3 respectively have a tank for containing the first chemical liquid. The suction pipe 46 extending from 36 is connected, and each pump unit 72-1 and
72-2, 72-3 second pump section 78-1, 78-2, 7
A suction pipe 58 for the second chemical liquid is connected to each of 8-3.

Further, the first pump parts 76-1, 76-2, 76
The discharge pipe 82 is connected to the discharge port of −3, and the discharge pipe 84 is connected to the discharge ports of the second pump portions 78-1, 78-2, 78-3. And 84 form a pair and are connected to a discharge unit 85 which will be described later.

Each pump unit 72-1, 72-2, 7
In the 2-3, a pressure sensor 86 and an integrating flowmeter 88 are provided on the discharge pipe 82 in the vicinity of the discharge ports of the first pump units 76-1, 76-2, 76-3. Here, the pressure sensor 86 detects the pressure of the discharge pipe 82, and the integrated flow meter 88 detects the integrated flow rate of the delivered chemical solution.

As shown in FIG. 5, in the discharge unit 85, the first chemical liquid and the second chemical liquid are mixed, and the mixed liquid (polyurethane foam chemical liquid) is injected into the long hole 90 formed in the ground G. . As shown in FIG. 7, the discharge unit 85 has a steel pipe 92 as a casing pipe inserted into the long hole 90 of the ground G.

Holes are formed in the steel pipe 92 at a pitch of about 30 mm (not shown), and the polyurethane foam chemical solution is injected into the ground G through these holes. In this example, the steel pipe 92 has a length of 12 m, and the amount of the chemical liquid for filling the inside of the steel pipe 92 is about 150 kg.

The discharge unit 85 has three merging portions 94 corresponding to the above-mentioned pump units 72-1, 72-2, 72-3 and three discharge pipes 96 connected to the merging portions 94. -1,96-2,96-3 and each discharge pipe 96-
It further has a longitudinal center member 98 that holds 1, 96-2, 96-3 at positions spaced by 120 ° in the circumferential direction.

Here, each discharge pipe 96-1, 96-2, 96-
Discharge holes 100 are provided at the tip of each of the three.
A static mixer is mounted in front of each discharge hole 100, and the static mixer mixes the first chemical liquid and the second chemical liquid.

These discharge pipes 96-1, 96-2, 96-3
Have different lengths, and as shown in FIG. 5, the discharge pipe 96-1 having the longest length is located on the far side of the long hole 90 of the ground G (No. 1 improvement zone in FIG. 5), The discharge pipe 96-2 of the second length is in the middle portion (No. 2 improvement zone in FIG. 5) in the long hole 90, and the discharge pipe 96-3 of the shortest length is the inlet side in the long hole 90. (Around No. 3 improvement zone in Figure 5)
Then, the foamed polyurethane chemical liquid from each pump unit 72-1, 72-2, 72-3 is discharged and injected therein.

Further, as shown in FIG. 7A, the central member 98 is provided with recesses 102 extending in the axial direction at three locations in the circumferential direction, and three recesses 102 are formed along the recess 102. The discharge pipes 96-1, 96-2, 96-3 are simultaneously inserted into the steel pipe 92.

As shown in FIG. 6, the control panel 74 is provided with an alarm 104 for issuing an alarm when a pressure abnormality occurs.
Is prepared. The alarm 104 issues an alarm based on the detection by the pressure sensor 86, for example, when the liquid medicine leaks from the liquid medicine container 10 and the second liquid medicine is not sucked into the injector 38 by a set amount.

In the method of injecting the chemical liquid of this example, the second chemical liquid is filled in the chemical liquid container 10 at the factory, and the second chemical liquid is placed on the vehicle 34 and transported to the chemical liquid injection site such as tunnel excavation work. Alternatively, the chemical solution container 10 filled with the second chemical solution at the factory is independently transported to the construction site where the vehicle 3
The chemical liquid container 10 is mounted on the container 4.

Then, either one of the tank 36 mounted on the vehicle 34 and the chemical liquid container 10 is used as a main tank, and the first chemical liquid and the second chemical liquid are supplied from there to the discharge unit 85 of FIG. And is injected into the ground G. At this time, either one of the chemical liquid containers 10
The second chemical solution from the injection tank 38 is mediated by the auxiliary tank 52.
Is supplied to.

The chemical solution container 10 has a capacity of 50 one-tower cans, so that the same chemical solution container 10 can be used for multiple injection operations. When the chemical solution container 10 on the side supplying the chemical solution is emptied during the tunnel excavation work, an alarm 68 is issued based on the detection by the liquid level detection sensor 64.

By this, the worker can know that the inside of the chemical liquid container 10 has become empty, and then the valve 32 of the chemical liquid container 10 on the side supplying the chemical liquid is closed,
Then, by opening the valve 32 on the side of the one chemical liquid container 10, the chemical liquid supply can be switched from the empty chemical liquid container 10 side to the other full chemical liquid container 10 side.

Further, at the time of switching, even if one of the chemical liquid containers 10 becomes empty, the supply of the second chemical liquid is performed through the auxiliary tank 52, so that the injector 38 is used.
Does not cause the inconvenience of inhaling air.
That is, one chemical liquid container 10 to the other chemical liquid container 1
Switching to 0 can be smoothly performed without trouble.

In the method for injecting the chemical solution of this example,
Large-capacity chemical liquid container 10 that can be repeatedly used and transported
Since the vehicle is mounted on and off the vehicle and used as a main tank, it is possible to solve the conventional problem that the second chemical solution is frequently transferred during the chemical solution injection work, and the burden on the operator is significantly reduced. In addition to reducing the problem, it is possible to solve the problem that a large amount of empty cans are generated as industrial waste at a tunnel excavation work site or the like.

Further, in some cases, it is possible to eliminate the need for a dedicated worker who replenishes the chemical liquid. Further, it becomes possible to automate the supply of the chemical liquid, and it is possible to automate the injection work of the chemical liquid, and at the same time, it is possible to reduce the industrial waste processing cost and the chemical liquid injection work cost.

Further, unlike the conventional case, it is no longer necessary to transfer the second chemical liquid, which is treated as a dangerous material, to the main tank by using the one-dose can, so that the chemical liquid remains in the emptied one-dose can and its treatment is a problem. In addition to eliminating the problem that the worker may frequently contact with dangerous materials when frequently transferring the chemical solution, the problem can be eliminated. Further, the chemical liquid container 10 used as the main tank is configured to be repeatedly usable and transportable, and the problem of safety during transportation can be solved.

Further, since the chemical solution container 10 has a large capacity for 50 cans of one-tower can, unlike the conventional case where a main tank of about 100 liters is used, the worker always keeps the first chemical solution during the injection work. It is possible to omit frequent monitoring work of the remaining amount of the chemical liquid with the second chemical liquid, and also in this respect, it is possible to reduce the burden on the worker.

Further, in this example, since the chemical liquid management unit 70 including the liquid level detection sensor 64 is mounted on the vehicle 34,
By the alarm from the alarm 68 in the chemical liquid management unit 70, even if the worker does not constantly monitor the liquid level inside the chemical liquid container 10, this can be known when the inside of the chemical liquid container 10 becomes empty, Then, the container switching work can be performed based on the alarm. Further, in some cases, the switching may be automatically performed instead of the switching by the worker.

Further, in this example, since the large-capacity leak prevention tank 48 is installed under the chemical liquid container 10, the second chemical liquid may leak from the chemical liquid container 10, such as the valve 32. Even in this case, the leakage prevention tank 48 can receive this and reliably prevent the second chemical liquid from flowing out.

Although the embodiment of the present invention has been described in detail above, this is merely an example. For example, in the above example, as the first chemical liquid in the polyurethane foam chemical liquid, which is not regarded as a dangerous substance is used. Therefore, although the chemical liquid container 10 is not used as the main tank in this embodiment, the first chemical liquid is regarded as a dangerous substance. When using such a container, it is possible to use the chemical liquid container 10 as the main tank. In addition, the chemical liquid container 10 as described above can be used as a main tank when supplying a chemical liquid that is not treated as a dangerous substance in some cases.

The present invention can also be applied when injecting a polyurethane foam chemical using a first chemical and a second chemical having various compositions other than the above example, or a chemical for strengthening the ground. It is also applicable when injecting various chemicals other than the foamed polyurethane chemical.

Further, not only in the case of strengthening the ground by injecting a chemical solution into the void of the ground and consolidating it, but also by injecting the chemical solution into a large cavity formed in the ground and filling it, and solidifying it, the ground is strengthened. The present invention can be applied to the case where

In the above example, the two chemical solution containers 10 are used and the chemical solution supply is continued by switching the containers. However, depending on the circumstances, only one chemical solution container 10 is mounted on the vehicle 34 and this is used as the main tank. It is also possible to replace the new chemical liquid container 10 with the chemical liquid container 10 on the vehicle 34 when the chemical liquid container 10 is emptied and to continue the chemical liquid injection thereafter. Others The present invention can be implemented in a mode in which various changes are made without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a diagram showing a chemical liquid injection facility used in one embodiment of the present invention.

FIG. 2 is a view showing a liquid medicine container and its peripheral portion in the embodiment.

FIG. 3 is a diagram showing a leakage prevention tank and a peripheral portion thereof in the embodiment.

FIG. 4 is a diagram showing a configuration of a chemical liquid container in the same embodiment.

FIG. 5 is an explanatory diagram showing a main part of the embodiment.

FIG. 6 is an enlarged view of the pump unit and the control unit of FIG.

FIG. 7 is an enlarged view showing a discharge unit in FIG.

FIG. 8 is an explanatory diagram showing an example of a conventional chemical liquid injecting method.

FIG. 9 is a diagram showing an example of forming a ground consolidation layer by the pouring method.

[Explanation of symbols]

10 Chemical solution container 11 containers 34 vehicles 38 injection machine 48 Leakage prevention tank 52 Auxiliary tank 64 Liquid level detection sensor (chemical liquid amount detection means) 68 Alarm (Notification Means) 70 Chemicals Management Unit (Medicine Management) 96-1, 96-2, 96-3 Discharge pipe 100 discharge holes G ground

Continued front page    F-term (reference) 2D040 AA06 AB01 BB09 CA02 CA10                       CB03 CD02 CD06 DA02 DA12                       EB04                 2D054 FA02

Claims (9)

[Claims] 1. An injection machine including a liquid-sending pump and a main tank containing a ground-strengthening chemical solution inside a vehicle, and the chemical solution in the main tank is inserted into the ground by the injection machine. A method for injecting a chemical liquid for ground strengthening, which comprises supplying to a pipe, discharging from a discharge hole of the discharge pipe, injecting and filling into a void or cavity of the ground and solidifying to solidify the ground, the container containing the chemical liquid. And a reusable and transportable chemical liquid container is mounted as a main tank on and off the vehicle, and the chemical liquid in the chemical liquid container is supplied to the discharge pipe by the injector. A method for injecting a chemical liquid for ground reinforcement, which is characterized by 2. The chemical liquid according to claim 1, wherein the chemical liquid is a two-liquid type polyurethane foam chemical liquid consisting of a first chemical liquid and a second chemical liquid, and at least one of the first chemical liquid and the second chemical liquid is A method for injecting a chemical liquid for ground reinforcement, which comprises supplying the discharge pipe from a chemical liquid container to the discharge pipe. 3. The chemical solution container according to claim 1, wherein a plurality of the chemical solution containers are mounted on the vehicle, the chemical solution inside is first supplied from one of the chemical solution containers, and another chemical solution is supplied when the inside becomes empty. A method for injecting chemical liquid for ground reinforcement, which is characterized by switching to supply from a container. 4. The auxiliary tank of any one of claims 1 to 3, which has a capacity smaller than that of the chemical liquid container for preventing the chemical liquid from running out when the container is switched, on the path of the chemical liquid from the chemical liquid container to the injector. A method for injecting a ground strengthening chemical solution, characterized in that the chemical solution is supplied from the chemical solution container to the injecting machine through the auxiliary tank. 5. The method for injecting a ground strengthening chemical liquid according to claim 4, wherein the auxiliary tank has a capacity capable of accommodating a chemical liquid amount required for at least one injection operation. 6. The chemical liquid management means according to claim 1, wherein the vehicle includes a chemical liquid amount detection means for detecting when the chemical liquid container supplying the chemical liquid is empty. A method for injecting a chemical liquid for ground reinforcement, characterized by being equipped with. 7. The chemical liquid management means according to claim 6, further comprising notification means for notifying a worker by a display or an alarm when the chemical liquid amount detecting means detects that the chemical liquid container is empty. A method for injecting a chemical liquid for ground reinforcement, which is characterized in that 8. The leak prevention tank according to claim 1, wherein a leakage prevention tank is mounted on the vehicle, the chemical liquid container is placed on the leakage prevention tank, and a chemical liquid leaks from the chemical liquid container. A method for injecting a chemical liquid for ground reinforcement, characterized in that the leaked chemical liquid is received in the leakage prevention tank when there is a problem. 9. The injection method according to claim 1, wherein the injection method includes a plurality of discharge pipes having different lengths, and the chemicals are discharged from different positions at substantially the same time to strengthen the ground. A method for injecting a chemical liquid for ground reinforcement, which is characterized in that