JP2003213664A - Chemical injection method, chemical injection device and soil purification method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chemical injection method and chemical injection device improved in injection effect while effectively using the advantage of the chemical injection method capable of performing water stopping, ground reinforcement, depression prevention or the like with a compact facility and applicable to fine sand, and to provide an easy and effective soil purification method. <P>SOLUTION: This chemical injection method comprises inserting a chemical injection pipe 2 to the ground, and feeding a chemical agent to the chemical injection pipe 2 while mixing air thereto by an ejection device 9 to evenly and effectively penetrate the chemical agent into the ground with the air. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical solution injecting method which is applied for stopping water, strengthening the ground, preventing deformation and the like.

[0002]

2. Description of the Related Art There is a chemical injection method which can be used to easily stop water, strengthen the ground, prevent deformation, etc. with compact equipment. There are other high-pressure injection methods, mechanical agitation methods, etc. as ground improvement methods, but the chemical solution injection method has advantages such as mobility and quick-acting, relatively cheap and little pollution compared with these methods.

The high-pressure injection method is a method in which the solidified material is jetted out at a high pressure and the ground is actively cut to replace and mix the solidified material with high strength. It is expensive and cannot be applied to gravel, cobblestone layer, hard silt, etc. There are slurry stirring method and powder stirring method as mechanical stirring method.
It cannot be constructed in high-value soil layers, and the unit price per improved soil volume is high.

As the chemical solution injection method, there are mainly a single tube rod method, a double tube strainer method and a double tube double packer method. The conventional single-tube rod method is limited in the chemicals that can be used after the accident of acrylamide-based chemicals, and the injection effect is small. The double pipe strainer method and the double pipe double packer method have a greater injection effect than the single tube rod method, but in fine sand, the injection agent enters only in the form of dumplings and a sufficient effect cannot be obtained.

[0005]

DISCLOSURE OF THE INVENTION The present invention makes use of the merit of the chemical liquid injection method that water stoppage, ground reinforcement, deformation prevention, etc. can be easily carried out with a compact facility, and at the same time, the injection effect is improved and fine sand is used. It is an object of the present invention to provide a chemical liquid injecting method and a chemical liquid injecting device that can be applied to a soil, and a simple and effective soil purifying method.

[0006]

In order to achieve the above-mentioned object, the chemical liquid injection method of the present invention is a chemical liquid injection method of inserting a chemical liquid injection pipe into the ground and injecting the chemical liquid into the ground through the chemical liquid injection pipe. Therefore, the ejecting device mixes air into the chemical liquid and sends it into the chemical liquid injection pipe. A double pipe rod may be used as the chemical injection pipe, and the first chemical mixed with air may be injected through one of the inner pipe and the outer pipe, and the second chemical may be injected through the other of the inner pipe and the outer pipe. In addition, the tip of the double-tube rod can be used as a monitor equipped with a chemical discharge port in the lateral direction. Also, drilling multiple holes with a boring machine,
It is also possible to insert a casing into each of the holes, insert the chemical liquid injection pipe into the casing, and then remove the casing to feed the plurality of chemical liquid injection pipes to the chemical liquid injection pipes at the same time. In this case, a chemical solution discharge port and a plug that closes the chemical solution discharge port are provided on the side surface near the tip of the chemical solution injection pipe, and the chemical solution injection pipe is inserted with the plug blocking the chemical solution discharge port. It is also possible to push down the stopper to open the drug solution discharge port and inject the drug solution.

In order to achieve the above object, the chemical liquid injector of the present invention comprises a vinyl chloride pipe, a chemical liquid discharge port provided on a side surface near the tip of the vinyl chloride pipe, and a plug provided near the tip in the vinyl chloride pipe. And a chemical liquid injection device having a cap provided at the end of the PVC pipe, a gap is provided between the stopper and the cap, and the stopper is located at a position that closes the chemical liquid outlet under atmospheric pressure. The stopper moves downward to open the chemical liquid discharge port by the pressure.
A conical recess may be provided at the top of the stopper, and an O-ring may be provided between the stopper and the PVC pipe.

In order to achieve the above object, the soil purification method of the present invention is a soil purification method in which a chemical solution injection pipe is inserted into the ground to inject a chemical solution for soil purification into the ground through a chemical solution injection pipe. The device mixes air with the chemical liquid and sends it to the chemical liquid injection pipe.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below. FIG. 1 is a front view showing an example of a chemical liquid injecting method according to the present invention. This example is an example using a single tube rod, and although it can be easily installed, it is the basis of other embodiments. The chemical injection pipe 2 is inserted into a place where the boring machine 1 is used for construction. A swivel 3 is provided at the upper end of the chemical injection pipe 2,
The swivel 3 is connected to the concentrator 5 by a hose 4. In this example, the drug solution to be injected is a slow infusion agent having a gel time of several minutes. Water glass (A)
Liquid) and a hardening agent (B liquid) such as cement which is a reaction agent are sent to the grout pump 6 by separate hoses, and after the grout pump 6 is mixed, the A liquid and the B liquid are mixed and concentrated with one hose. It is a so-called one-shot method of sending to the device 5.
A flow meter 7 is provided between the grout pump 6 and the concentrator 5 so that the amount of injected chemical solution can be controlled. An air compressor 8 is connected to the concentrating device 5, and the air sent from the air compressor 8 is mixed with the chemical liquid in the ejecting device 9 and sent to the chemical liquid injection pipe 2. FIG. 2 shows a sectional view of the eject device 9. The injection material (medicine) is supplied from the right side of the figure, but the flow path of the injection material is narrow in the eject device, and a supply port to which air is supplied from the air compressor is provided in the narrowed portion. Has been.

As described above, the injection liquid in which the liquid A, the liquid B and the air are mixed is injected into the ground through the chemical injection pipe 2. In this method, the injection material contains air, so the injection material effectively enters the gaps in the soil. In the conventional method, the pouring effect was not sufficient, and especially in the case of fine sand, the pouring material entered only in the form of dumplings, but according to this method, the pouring material can be spread evenly in any soil type. Even when water is contained in the ground, pressure is applied to the air to send the injectable material, so that the water is pushed up and the injectable material remains in the ground, which is excellent in permeation of the injectable material. The effect can be improved with less injection material. In particular, in the single-tube rod construction method as in the present embodiment, the conventional method was not able to exert a sufficient effect after the use of the acrylamide system was restricted, but according to the present construction method, the single-tube rod construction method is also available. Effective chemical injection is possible.

The construction method of this example can be applied to water stopping and bending over of a section of a sheet pile. FIG. 3 shows an example of a water stop for a section of a sheet pile. 4 as shown in FIG.
The chemical solution is injected into the injection points provided at 0 cm pitch.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, a double pipe rod is used as the chemical liquid injection pipe 2. By using a double tube rod, it is possible to use an injection material of any gel time. In the example of FIG. 4, the instant binding material is used, but it goes without saying that a loose binding material can be used. The chemical liquid injection pipe 2 is inserted into the ground by the boring machine 1. At the time of insertion, the chemical liquid injection pipe 2 can be drilled while ejecting air or water from the tip of the chemical liquid injection pipe 2. The chemical injection pipe 2 is a double pipe, but the drilling method is to send air to both the inner and outer pipes.
There are a method of sending air for the inner tube and water for the outer tube, and a method of sending water for both the inner tube and the outer tube. If there is a road or the like, using air and water will reduce the amount of water used so that the road will not be flooded, but if the water does not cause a problem, drill with water only. May be. When water glass (sodium silicate: A liquid) is used as the main agent and a curing agent (B liquid) such as gypsum, an oxidation reaction agent, and a metal salt reaction agent is used as a reaction agent, the A solution is a grout pump 6 Is sent to the swivel 3 above the chemical injection pipe. A flow meter 7 is provided between the grout pump 6 and the swivel 3 so that the amount of injected liquid A can be controlled. B
The liquid is sent by the grout pump 6 through the concentrator 5 to the swivel 3. The central device 5 is provided with an eject device 9 and is connected with an air compressor 8.
The air sent from the air compressor 8 and the B liquid are mixed. In the chemical liquid injection pipe 2, the liquid A is sent through the outer pipe, and the mixture of liquid B and air is sent through the inner pipe to the ground. Liquid A and liquid B injected into the ground contact and react with each other, and solidify after a predetermined gel time has elapsed. In this method, since the injecting material is injected by mixing air, the injecting material can be satisfactorily infiltrated between the soil particles even in a fine sand layer which is difficult with the conventional chemical solution injecting method.

A third embodiment of the present invention will be described with reference to FIG. Most of the apparatus is common to the above-described double tube rod embodiment, but in this embodiment, the tip of the chemical injection pipe 2 is a monitor having a chemical discharge port in the lateral direction. An enlarged view of the tip portion of the chemical liquid injection pipe 2 is shown in FIG. The upper part is a double tube with an outer diameter of 40.5 mm, and the lower part is a monitor with an outer diameter of 50 mm. The outer tube of the double tube is connected to the discharge port provided on the side of the monitor.
On the other hand, the inner pipe is divided into a passage connected to the discharge port provided on the side surface and a passage connected to the discharge port provided at the tip inside the monitor. When the chemical injection pipe 2 is inserted into the ground, water or air (or both water and air) is sent through the inner pipe, and a hole is formed while discharging from the discharge port provided at the tip. When digging to a predetermined depth and injecting the chemical liquid, an iron ball is put into the inner pipe from above the chemical liquid injection pipe 2.
The iron ball that reached the inside of the monitor blocks the passage leading to the discharge port provided at the tip. Similar to the second embodiment, the liquid A is sent to the outer pipe and the mixture of liquid B and air is sent to the inner pipe. The liquid A passing through the outer pipe is naturally discharged laterally from the side discharge port, but the mixture of liquid B and air passing through the inner pipe is also blocked by the iron ball and cannot proceed downward, and the side discharge port It is discharged more laterally. Also in this embodiment, since the injecting material is injected by mixing the air, the injecting material can be satisfactorily penetrated between the soil particles even in the fine sand layer.

A third embodiment of the present invention will be described with reference to FIG. In this embodiment, the chemical solution injection pipe 2 is inserted into the ground by a procedure similar to the double packer method. That is, first, a boring machine is used to make a hole to a predetermined depth, the cylindrical casing 10 is inserted into the hole, and then the chemical liquid injection pipe 2 is inserted into the casing. After inserting the chemical injection pipe 2, the casing 10 is pulled out from the ground. The above procedure is repeated to install about 10 to 20 chemical injection pipes 2 in the ground. In this embodiment, so-called non-chemical liquid type such as cement milk and cement / bentonite, solution type having a gel time of about 5 minutes, or gel time of about 1 minute can be used as the injecting material. It is also possible to combine materials and inject sequentially. The chemical liquid injection pipe 2 is made of a PVC pipe having a diameter of 2.54 cm, which is called an inch PVC pipe. The tip is covered with a cap, and a discharge port for discharging the injection material is provided on the side surface slightly above it. 10
When about 20 chemical solution injection pipes 2 are installed in the ground, a cap is put on the upper end of the chemical solution injection pipe 2 and the hose 4 is connected. The configuration of the device upstream of the hose 4 is the same as that of the first embodiment, so details thereof will be omitted.
Connect a hose for injection of chemicals to all of and make injections at the same time. In this method, the injection amount of the injection material is 8 liters /
The standard is from 12 to 12 liters / minute.

As an example of the chemical injection device used in this embodiment, FIG. 8 is a sectional view of a chemical injection pipe. In this example, the discharge ports are provided in four directions. Further, a substantially cylindrical plug 11 is provided near the tip in the PVC pipe. When the chemical injection device (chemical injection pipe) is inserted into the ground, the stopper 11 is at the position shown in FIG. 8 (a) and the discharge port is blocked. Although there is a slight gap between the stopper 11 and the cap, the O-ring provided at the bottom of the stopper 11 causes the stopper 11
Does not fall downward when only atmospheric pressure is applied. Therefore, when the chemical injection pipe is inserted into the ground, the discharge port is closed by the plug 11, so that the earth and sand do not enter the inside of the chemical injection pipe.
When the injection material is fed into the chemical liquid injection pipe, the stopper 11 is pushed by the injection material and moves down to the position shown in FIG. 8B. As a result, the discharge port that has been blocked by the plug 11 is opened, and the injection material is discharged into the ground. The cap of this example is provided with a small hole so that the air under the stopper 11 is allowed to escape and the lowering of the stopper 11 is not hindered. Also,
The top surface of the stopper 11 is provided with a conical recess so that the stopper 11 can effectively receive the pressure of the injection material, and the injection material released into the ground can be sent upward.

FIG. 9 shows an arrangement example of the injection points. Figure 9
As shown in (a), it is standard to arrange them in two rows in a staggered pattern. The distance between the rows is about 50 cm, and each row is 100 cm.
An injection point is provided every other time. Arrangement methods such as (b) arrangement in a large number of rows, (c) arrangement in concentric circles, (d) arrangement in ellipse, etc. can be appropriately selected according to the place and purpose of construction.

The chemical liquid injection method and the chemical liquid injection device of the present invention have been described above with reference to the first to fourth embodiments. However, these are applied to civil engineering works such as water stoppage, ground reinforcement, and deformation prevention. It was an example applied. However, the chemical liquid injection method and the chemical liquid injection device of the present invention are not limited to this, and can be applied to the purification of contaminated soil. In this case, a chemical that neutralizes and decomposes contaminants is used as the injection material. Alternatively, microorganisms that decompose pollutants can be injected. Although any of the construction methods according to the first to fourth embodiments described above can be applied to the soil purification method, the construction method according to the fourth embodiment is particularly suitable for soil purification. Since the chemical injection pipe is left in the ground, it can be injected multiple times, and if it is found that the cleaning is not sufficient in one construction, re-inject the chemical using the remaining chemical injection pipe. Good. Further, even in the case of complex contamination by a plurality of substances, it is possible to inject a drug corresponding to each contaminant at different times. Regardless of which of the construction methods according to the first to fourth embodiments is used, the chemical liquid is injected together with air, so that it can be applied to all types of soils and can evenly permeate into the ground. Also, since it is injected together with air, it is also effective for feeding aerobic microorganisms.

[0018]

According to the present invention, it is possible to realize a chemical liquid injection method and a chemical liquid injection device in which water stoppage, ground reinforcement, deformation prevention, etc. can be easily carried out with compact equipment. Since the injection material penetrates into the ground together with the air, it has a high injection effect and can evenly penetrate into the ground, and it can be applied to a fine sand layer which was difficult with the conventional method. It has high versatility because various injection materials can be selected. Furthermore, a highly effective soil purification method can be realized by using a chemical or a microorganism that removes pollutants as an injection material.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating an example of a first embodiment of a chemical liquid injection method according to the present invention.

FIG. 2 is an enlarged cross-sectional view of an eject device.

FIG. 3 is a plan view showing an example in which the present invention is applied to a water stop for a section of a sheet pile.

FIG. 4 is a block diagram illustrating an example of a second embodiment of a chemical liquid injection method according to the present invention.

FIG. 5 is a block diagram illustrating an example of a third embodiment of a chemical liquid injection method according to the present invention.

FIG. 6 is a cross-sectional view showing an example of a monitor used in the chemical liquid injection method according to the present invention.

FIG. 7 is a cross-sectional view illustrating an example of a fourth embodiment of a chemical liquid pouring method according to the present invention.

FIG. 8 is a cross-sectional view showing an example of a chemical injection device according to the present invention.

FIG. 9 is a plan view showing an arrangement example of injection points.

[Explanation of symbols]

1. Bowling machine 2. Chemical injection pipe 3. swivel 4. hose 5. Centralized device 6. Grout pump 7. Flowmeter 8. Air Compressor 9. Eject device 10. casing 11. plug

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2D040 AA00 AA04 AC02 BA02 CA02                       CB03 CC02 CC03 CD01 CD03                       CD09 DA01 DA03 DA07 DA09                       DA11 DC02

Claims (8)

[Claims] 1. A chemical injection method for inserting a chemical injection pipe into the ground to inject the chemical into the ground through the chemical injection pipe,
A chemical injection method in which air is mixed into the chemical by an eject device and sent to the chemical injection pipe. 2. The chemical liquid injection pipe is a double pipe rod, and the first chemical liquid mixed with air is injected through one of the inner pipe and the outer pipe, and the second chemical liquid is introduced through the other of the inner pipe and the outer pipe. The method for injecting a chemical liquid according to claim 1, wherein 3. The chemical injection method according to claim 2, wherein the tip of the double pipe rod is a monitor provided with a chemical discharge port in a lateral direction. 4. A boring machine is used to drill a plurality of holes, insert a casing into each of the holes, insert a chemical injection pipe into the casing, and then remove the casing.
The chemical solution injection method according to claim 1, wherein the chemical solution is simultaneously sent to a plurality of chemical solution injection pipes. 5. A drug solution outlet and a stopper for closing the drug solution outlet are provided on the side surface near the tip of the drug solution injection pipe, and the drug solution injection pipe is inserted with the plug blocking the drug solution discharge port. The chemical solution injection method according to claim 4, wherein the chemical solution is injected by pressing down the stopper by pressure to open the chemical solution discharge port. 6. A drug solution having a PVC pipe, a drug solution discharge port provided on a side surface near the tip of the PVC pipe, a stopper provided near the tip in the PVC pipe, and a cap provided at the tip of the PVC pipe. It is an injection device, and there is a gap between the stopper and the cap, and the stopper is located at a position where it blocks the chemical solution outlet under atmospheric pressure. A chemical injection device designed to be opened. 7. A conical recess is provided on the top of the stopper, and an O-ring is provided between the stopper and the PVC pipe.
The chemical injection device according to. 8. A soil purification method in which a chemical injection pipe is inserted into the ground to inject soil into the ground through a chemical injection pipe, and air is mixed into the chemical by an eject device and sent to the chemical injection pipe. Soil purification method.