JPS5833332B2 - 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 is placed inside an outer tube that has a cutting blade at its tip, and a valve body that closes the tip of the inner tube and a valve body that moves up and down in the valve chamber between the inner tube and the outer tube are installed below it. However, when the latter valve body is in its raised position, it connects the upper hole bored in the wall of the inner and outer pipes, and in its lowered position, it connects the lower hole bored in the wall of the inner and outer pipes with the outside. A chemical liquid injector with communication is disclosed in Japanese Patent Application No. 5462 filed by this applicant.
822, No. 155,815).

By the way, with this device, the valve body placed inside the inner pipe is not attached when drilling a hole, but is attached to the inner tube only when the chemical solution is injected, so there is a risk that the operator may forget to put it on when injecting the chemical solution. However, there was a drawback that the intended purpose could not be achieved.

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a chemical liquid injection device which eliminates the drawbacks of the previously proposed devices as described above, and which has a simple structure and is easy to operate.

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

In the drawing, the injection device 1 is a double tube consisting of inner and outer tubes 2 and 3, and a digging blade 4 is provided at the tip of the outer tube 3. Above this, the inner and outer tubes 2 and 3 are connected to a bottom wall 5. 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, the upper limit position of the valve 6 is determined by the stopper 9, and a horizontal hole 10 is bored in the upper part of the valve 6.

A cylindrical inner valve 11 is arranged inside the inner tube 2 so as to slide along the tube wall, and between the bottom surface of this valve 11 and the upper surface of a seat 13 provided inside the inner tube 2. An extension spring 12 is installed, and this spring 12 always gives the valve 11 an upward tendency.The upper limit position of the valve 11 is determined by a stopper 14.The valve 11 has a horizontal hole 15 and a vertical hole 16. A T-shaped hole consisting of

In the valve chamber 7 portion, valves 11 are provided at the upper and lower parts of the pipe wall of the inner pipe 2.
An upper hole 17 that coincides with the horizontal hole 15 of the valve 11 when the valve is raised and opens when the valve is lowered, and a lower hole 18 that is closed when the valve is raised and opens when it is lowered to communicate with the valve chamber 7 are formed.

In the valve chamber 7 portion, an upper hole 19 and a lower hole 20 that are always open are bored in the upper and lower parts of the pipe wall of the outer tube 3, respectively, and the upper hole 19 is closed when the outer valve 6 rises and coincides with the horizontal hole 10 when the outer valve 6 is lowered. ing.

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 the figure, reference numeral 21 denotes a long type gelling material tank, which is connected to the inner pipe 2 by a pipe 22, and a pump 23 and a valve 24 are arranged in the pipe 22.

26 is a curing agent tank connected to the outer pipe 3 by a pipe 27, a pump 28 and valves 29 and 30 are arranged before and after the pump 27, respectively, and a polling water tank 31 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.

(2) Hole excavation work (Figures 2 and 6) Polling 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 rotating, the ground is Excavation will be carried out on 36th.

At this time, the water supplied into the outer tube 3 moves the valve 6 downwardly through the upper hole 17 of the inner tube 2 against the push-up blade of the spring 8 due to its pressure.

The water thus lowered through the valve 6 flows through the hole 17 as shown by the arrow in FIG. It enters the inner pipe 2 through the holes 15 and 16 of the valve 11, and is discharged from the tip of the device 1 into the drilled hole 37, thus forming the drilled hole 3T of a predetermined depth.

2. Injection of instant setting type gelling material (Figures 3 and 7) When the drilling of the borehole 37 is completed as described above, the water supply to the outer pipe 3 is stopped, and the inner pipe 2 is injected with the pump 24. mold gelling material,
Further, the curing agent is simultaneously supplied to the outer tube 3 by the pump 28.

As a result, the valves 6, 11 are activated by the springs 8, 11, as shown in FIG.
The upper and lower holes 1 of the inner tube are simultaneously lowered against the push-up blades 12 and
7.18 is opened, and the hole 18 communicates with the transverse hole 10 of the valve 6 and the upper hole 19 of the outer tube 3.

Through the openings of the holes 17 and 1B, the long gelling material and the curing agent are mixed in the inner pipe 2 at the upper part of the valve 11 to form an instant-setting gelling material, and the instantaneous gelling material thus constituted is The gelling material is poured into the pores from the holes 19, and a packer 38 is formed in the pores as shown in the seventh figure.

3. Injection of long-form gelling material (Figs. 4 and 8) Once the packa 38 is formed as described above, the supply of hardening agent to the outer tube 3 is stopped, and the long-form gelling material is injected into the inner tube 2. Only the supply of gelling material continues.

As a result, only the valve 6 is returned to its original position by the push-up blade of the spring 8, closing the hole 19, but since the valve 11 remains in the same position, the lower hole 18 of the inner tube 2 is open.

Therefore, the long gelling material supplied into the inner tube 2 exits from here into the outer tube 3 and passes through the lower hole 20 bored in the tube wall of the outer tube 3 to the lower part of the packer 38 as shown in the eighth figure. It is injected into the pores and injected into the pore walls to form a shrink-type gelling material layer 39.

In this way, an impermeable gelling material layer for ground reinforcement is formed at the bottom of the hole 37, but if necessary, the device 1 can be pulled up by the required amount and the gelling material layer above it can be similarly formed. FIG. 9 shows the material layers 3B' and 39' formed thereon.
This process can be repeated as many times as necessary.

It goes without saying that the above-mentioned material is merely an example, and that it can be modified at will as long as it has a similar function without departing from the scope of the claims. Since they are provided, you can choose any suitable one.

Since this invention is as described above, drilling is performed while supplying polling water to the outer pipe and injecting water to the outside from the tip of the pipe, and after drilling a hole of a desired depth, the polling water is supplied to the outer pipe while the water is being poured into the hole. At the same time, the instant-setting gel material is supplied through the inner and outer tubes, and the instant-setting gel material is poured into the hole at a predetermined distance above the hole bottom through the upper hole of the outer tube. This forms a patch on the iron part, and once this formation is complete, supply the long gelling material to the inner tube, and pour out the long gelling material below the patch through the lower hole of the outer tube. In this way, while preventing the long gelling material from leaking out of the hole, the gelling material is injected into the hole wall at the bottom of the hole, strengthening the ground and reducing water infiltration. This can be achieved reliably, and no other operations are required, so much so that the only work required to achieve this is the selection of the liquid to be supplied, and in this way, the chemical solution can be injected efficiently with simple operations. In addition, it has excellent effects such as simple structure and easy maintenance.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of an embodiment of the present invention, Fig. 2 is a longitudinal sectional front view of the same as the above, showing the state during excavation, and Fig. 3 is a longitudinal sectional view of the same as the above, showing the state during injection of flash-setting gel material. 4 is a longitudinal sectional front view showing the state of the same as above when the long gel material is injected, FIG. 5 is a line diagram showing the material supply system when using the same as above, and FIGS. 6 to 9
The figure is a schematic diagram showing the order of the construction method according to the present invention. 1...Injection device, 2...Inner tube, 3...
...Outer tube, 4...Drilling blade, 5...
Bottom wall, 6... Outer valve, 7... Valve chamber, 8
...Spring, 10...Horizontal hole, 11...
...Inner valve, 12... Spring, 16...
...Vertical hole, 17... Upper hole, 18...
Lower hole, 19... Upper hole, 20... Lower hole, 36... Ground, 37... Drilling,
38...Patsuka, 15...Horizontal hole.

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 given an upward tendency, are arranged in the inner pipe so as to slide on the valve chamber wall surface and the inner pipe wall surface, respectively, and the outer valve and the inner valve are arranged so as to slide on the valve chamber wall surface and the inner pipe wall surface, respectively. A hole is provided, and when the outer valve is lowered by the liquid pressure of the liquid supplied to the outer tube, the upper hole of the inner tube and the hole of the inner valve communicate with each other, and the liquid is poured out from the tip of the inner tube, When the inner and outer valves are lowered by the liquid pressure of the liquid supplied to the inner and outer tubes, the upper hole of the inner tube communicates with the outer tube, and the upper hole of the outer tube communicates with the lower hole of the inner tube through the hole of the outer valve. When the liquid is poured out from the upper hole of the outer tube and the inner valve is lowered by the pressure of the liquid supplied to the inner tube, the lower holes of the inner and outer tubes communicate with each other and the liquid is poured out. A liquid injector characterized in that the liquid medicine is poured out from the lower hole of the tube.