JPS603574B2 - Chemical injection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for injecting a chemical into the ground.

An inner tube with a bottom wall is placed between the outer tube and the outer tube, and a valve chamber is formed in the inner and outer tubes above the bottom wall. An outer valve and an inner valve are arranged with a constant upward tendency, and when the outer valve descends, the upper hole drilled in the inner pipe and the hole drilled in the inner valve communicate, and the inner and outer valves descend. When this happens, the upper hole of the inner tube fits into the outer tube, and the upper hole drilled in the outer tube connects with the lower hole drilled in the inner tube through the hole drilled in the outer valve.
When the inner valve is lowered, the lower hole drilled in the inner and outer tubes passes through the hole in the outer valve and the valve chamber.The drug injection device was developed in 1986, filed by the same applicant. 1
It has already been proposed as seen in No. 75765.

By the way, this device has holes in the upper and lower parts of the inner tube, and when forming an instant-fed gelling material, the long-set gelling material supplied to the inner tube and the long-set gelling material supplied to the outer tube are passed through the upper hole into the inner tube. Since the hardening agent that has flowed into the pipe is merged with the instant setting type gelling material that is poured out through the lower hole, there is a drawback that the stroke of the inner and outer valves becomes larger, making it easier to cough up foreign substances. .

Also, when there is a diamond in the biasing force that gives an upward tendency to the inner and outer valves, or when there is a pressure difference between the liquids in the inner and outer pipes, liquid flows back from one pipe to the other during the downward movement of the inner and outer valves. Then, it becomes a gelatinous material and hardens, potentially clogging the tube. SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid drug injection device that can eliminate the drawbacks of the previously proposed devices as described above.

The present invention will be described below with reference to embodiments shown in the drawings.

In FIG.
It is a heavy pipe, and a digging blade 4 is provided at the tip of the outer pipe 3, and a bottom wall 5 is provided between the inner and outer pipes 2 and 3 above it.
is closed.

Above this bottom wall 5, a valve chamber 7 is provided between the inner and outer pipes 2 and 3.
A tubular outer valve 6 is disposed in the valve chamber 7 so as to slide along both the inner and outer pipe walls, and an extension spring 8 is disposed between the bottom surface of the valve 6 and the top surface of the bottom wall 5. The spring 8 always gives the valve 6 an upward tendency, and the upper limit position of the valve 6 is determined by the stopper 9.

As shown in FIG. 2, this outer valve 6 has a plurality of notches 10 and 11 formed in the upper and lower parts, and a hole 12 bored in the upper part at a predetermined interval from the notches 10 in the circumferential direction. ing.
Inside the inner pipe 2, a tubular inner valve 13 with a closed top is disposed so as to float along the pipe wall, and the bottom surface of this valve 13 and the upper surface of a seat 14 provided inside the inner pipe 2 are connected to each other. An extension spring 15 is inserted between the two, and the spring 15 always gives the valve 13 an upward tendency, and the upper limit position of the valve 13 is determined by the stopper 6.

As shown in FIG. 3, this inner valve 13 has a plurality of notches 17 formed in its lower part. In the valve chamber 7 portion, the pipe wall of the inner pipe 2 has a plurality of first holes 18 and the first holes 18.
A second hole 19 is bored at the same height as the second hole 19 at a predetermined interval in the circumferential direction. A plurality of upper holes 20 located on a straight line and a plurality of lower holes 21 which are always open are bored.

When only the outer valve 6 is lowered, the first hole 1 of the inner pipe
8 and the upper notch 10 of the outer valve 6 communicate with each other (FIG. 4),
When the inner and outer valves 13 and 16 are lowered, the first hole 18 of the inner tube 2 and the upper notch 10 of the outer valve 6 fit together, and the second hole 19 of the inner tube 2 and the upper hole of the outer tube 3 fit together. 20 passes through the hole 12 of the outer valve 6 (FIG. 5), and when only the inner valve 13 is lowered, the first hole 18 of the inner tube 2 and the lower part 11 of the outer valve 6 communicate with each other. (Figure 6).

The required material source is supplied to the inner and outer tubes 2, 3 of the injection device 1 as described above as shown in FIG. In this figure, 22 is a long gelling material tank connected to the inner pipe 2 by a pipe 23, and a pump 24 and a valve 2 are connected to this pipe 23.
5 is installed. Reference numeral 26 denotes a curing agent tank, which is connected to the outer pipe 3 by a pipe 27. A pump 28 and valves 29 and 30 are installed in the pipe 27 before and after the pump 28, respectively, and a water tank 31 for boring water is connected to the valve 29 by a pipe 32. ing.

Operations such as drilling a hole 37 in the ground 36 and injecting a chemical solution are performed using the above-mentioned device, and these operations will be explained below.

1 Hole drilling work (Figures 4, 7, and 11) Boring water is supplied from the water tank 31 by the pump 28 into the outer pipe 3 of the injection device 1, and while the device 1 is rotated, the same method as in the normal drilling method is carried out. excavation is carried out in the ground 36.

At this time, the pressure of the water supplied into the outer tube 3 causes the outer valve 6 to descend against the upward force of the spring 8, and the first hole 18 of the inner tube 2 is connected to the upper notch 10 of the valve 6. become suitable.

The water that has descended through the valve 6 in this way enters the inner pipe 2 through the upper part 10 of the valve 6 and the first hole 18 of the inner pipe 2, as shown by the arrows in FIGS. Drill a hole 37 from the tip of device 1
In this way, a hole 37 of a predetermined depth is formed. 2 Injection of instant-setting gelling material (5th, 8th, 12th
Figure) When the drilling of the borehole 37 is completed as described above, the water supply to the outer tube 3 is stopped, and the long-set gelling material is applied to the inner tube 2 by the pump 24, and hardened to the outer tube 3 by the pump 28. Both agents are supplied at the same time.

As a result, the inner and outer valves 13 and 6 simultaneously descend against the upward force of the springs 15 and 8, respectively, as shown in FIGS. 5 and 8, and the first and second holes 18 and 19 of the inner tube 2 are closed. , first hole 18
The second hole 19 fits into the upper notch 10 of the valve 6, and the second hole 19 fits into the upper hole 20 of the outer tube 3 through the hole 12 of the valve 6. The long-setting gelling material and the curing agent are mixed in the inner pipe 2 at the upper part of the valve 13 through the entrances of the first and second holes 18 and 19 to form an instant-setting gelling material. The formed Fujitsugi-type gelling material is poured into the pores from the upper hole 20, and a packer 38 is formed in the pores as shown in FIG.
3. Injection of long-curing gelling material (Figs. 6, 9, and 13) After the packer 38 is formed as described above, the supply of the curing agent to the outer tube 3 is stopped, and the long-curing gelling agent is injected into the inner tube 2. Only the supply of mold gelling material continues.

As a result, only the outer valve 6 returns to its initial position due to the upward force of the spring 8 and closes the second hole 19, but the valve 13 remains in the same position and the first hole 18 of the inner tube 2 is closed to the outer valve 6. It will fit into the lower notch 11. Therefore, the long gelling material supplied into the inner tube 2 enters the outer tube 3 through the first hole 18 and the lower notch 11, and enters the outer tube 3 through the lower hole 20 bored in the wall of the outer tube 3. 13, it is poured into the pores below the packer 38 and injected into the pore walls to form a long gelling material layer 39. In this way, an impermeable gelling material layer 39 for ground reinforcement is formed at the bottom of the hole 37, but if necessary, the device 1 can be pulled up by a required dimension,
Similarly, a packer 38' and a gelling material layer 39' are provided above it.
The formed structure is shown in FIG. 14, and this process can be repeated as many times as necessary. In the above example, notches were formed at the upper and lower parts of the outer valve and at the lower part of the inner valve, but holes may be formed in place of these notches. , it goes without saying that any changes can be made without departing from the scope of the claims, and since many applicable gelling materials have already been provided, any suitable one can be selected.

Since this invention is as described above, drilling is performed while supplying boring water to the outer pipe and injecting water to the outside from the tip of the outer pipe, and after drilling a hole of a desired depth, the boring water is supplied to the outer pipe while the pipe is installed inside the hole. At the same time, the supply is stopped, and the wisteria-striped gelling material is supplied through the inner and outer tubes, and the instant setting gelling material is poured out through the upper hole of the outer tube into the hole at a predetermined distance above the hole bottom. With this, a packer is formed in the part, and when this formation is completed, a long-head gelling material is supplied to the inner tube, and the long-head gelling material is poured out below the packer through the lower hole of the outer tube. In this way, the packer prevents the long-set gelling material from spilling out of the hole, while injecting the gelling material into the hole at the bottom of the packer, thereby strengthening the ground and reducing water infiltration. This can be accomplished by simply selecting the liquid to be supplied, without requiring any other operations, and in this way, the chemical solution can be injected efficiently with simple operations.

In addition, since the first and second holes drilled in the inner tube are located at the same height, the stroke of the inner and outer valves becomes smaller, suppressing the coughing up of foreign objects. Since the inflow of liquid into the tube and the outflow of the combined and mixed liquid are done through the first and second holes at the same height, there is no backflow of liquid, which prevents blockage of the pipe. It has excellent effects such as simple configuration and easy maintenance.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of an embodiment of the chemical liquid injector of the present invention, FIG. 2 is a perspective view of the outer valve, and FIG. 3 is a perspective view of the inner valve.
Fig. 4 is a vertical sectional front view showing the condition of the item in Fig. 1 during excavation, Fig. 5 is a longitudinal sectional front view showing the condition of the item in Fig. 1 during injection of instant gelling material, and Fig. 6 is the same as Fig. 1. 7 is a cross-sectional view taken along the line W-skin in FIG. 4, and FIG. 8 is a cross-sectional view taken along the line W-skin in FIG. 5. 9 is a cross-sectional view taken along the line x 1K in FIG. 6, and FIG. 10 is a line diagram showing the material supply system when the invention is used.
FIGS. 10 to 14 are schematic diagrams showing the order of the construction method using the device of the present invention. 1... Chemical injection device, 2... Inner tube, 3...
...Outer pipe, 4...Drilling blade, 5...Bottom wall, 6...Outer valve, 7...Valve chamber, 8...
...Spring, 10...Top notch, 11...
Lower notch, 12...hole, 13...inner valve, 15...spring, 17...notch, 1
8...First hole, 19...Second hole, 20...
... Upper hole, 21... Lower hole. Rust - Plan 2 Figure 3 Figure 4 Box 5 Figure 6 Figure 7 Figure Heron 8 Figure 9 Equipment diagram Band ll Figure Heron Rare l 3 Figure Heron - 4 Figure

Claims (1)

[Claims] 1. An inner tube with a bottom wall provided between the outer tube and the outer tube is disposed within an outer tube having a cutting blade at the tip, and a valve chamber is formed between the inner and outer tubes above the bottom wall, and a valve chamber is formed between the inner and outer tubes above the bottom wall. An outer valve and an inner valve, which are always upwardly inclined, are placed in the inner pipe so as to slide on the valve chamber wall and the inner pipe wall, respectively. A first hole and a second hole are provided at a predetermined interval in the circumferential direction, and a communication part and a hole are provided at a predetermined interval in the circumferential direction in the upper part of the outer valve, and a communication part and a second hole are provided in the lower part. A communication part is provided, and a communication part is further provided at the lower part of the inner valve, so that when only the outer valve is lowered, the first hole of the inner pipe and the upper communication part of the outer valve communicate with each other, and the liquid supplied to the outer pipe is is poured out from the tip of the inner tube and the inner and outer valves descend, the first hole of the inner tube and the upper communication part of the outer valve communicate, and the second hole of the inner tube and the upper hole of the outer tube communicate with each other. The liquid supplied to the inner and outer pipes is poured out from the upper hole of the outer pipe, and when only the inner valve is lowered, the first hole of the inner pipe and the lower part of the outer valve communicate with each other through the hole of the outer valve. The department communicates with
A chemical liquid injector characterized in that a liquid supplied to an inner tube is poured out from a lower hole of an outer tube.