JPS603576B2 - Chemical injection device - Google Patents

Description

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

An inner tube is placed at a predetermined gap within an outer tube having a cutting blade at its tip, an annular wall is provided at the tip of the inner tube to close the gap, and a predetermined gap is provided in the circumferential direction of the annular wall. The first one I put
A hole and a second hole are provided, and a hole is provided in the outer tube that constantly communicates with the first hole, and a valve that is always given an upward tendency is arranged near the tip of the inner tube, and this valve has a second hole in the raised position. Close the first hole, open the second hole so that the gap and the inside of the tip of the outer tube are connected, and open the first hole in the lowered position to connect the first hole and the inside of the inner tube. At the same time, a liquid drug injection device in which a second hole is opened so as to fit between the gap and the inside of the inner tube has already been proposed as seen in Tokubo Sho 56-119788 filed by this applicant. has been done.

By the way, in this device, the long gelling material is poured out from the opening at the tip of the outer tube, so the flow of the gelling material is downward, resulting in a poor shape of the gelling material layer that is formed, which may lead to the strengthening of the ground. There was a drawback that it was not possible to sufficiently reduce water permeability.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the previously proposed devices as described above, and to provide a chemical liquid injection device that is simple in structure and easy to operate.

The present invention will be described below with reference to embodiments shown in the drawings. An injection device 1 is shown in FIGS. 1 to 5, and the injection device 1 has a double tube consisting of an outer tube 2 and an outer tube 3.
A digging blade 4 is provided at the tip of the inner tube 2, and above the digging blade, a gap 6 between the inner and outer tubes 2 and 3 is closed by an annular wall 5 provided at the tip of the inner tube 2.

The annular wall 5 has a first hole 7 passing through it laterally, and a first hole 7 extending therethrough laterally.
A second hole 8 is bored through the hole 7 and the inner tube 2 from the upper surface with a predetermined gap in the circumferential direction. Further, the outer tube 3 is provided with an upper hole 9 that communicates with the first hole 7 at all times, and a lower hole 10 that is spaced apart from the closing end 25 of the upper hole 9 . Inside the tip of the inner tube 2, a first valve 11 with a stem 12 at the bottom is arranged so as to move along the wall surface, and a stopper 13 provided on the stem 12 and a catch 24 provided on the outer tube 3 are arranged. An extension spring 14 is inserted between the first valve 11 and the first valve 11, and the first valve 11 is always given an upward tendency by the spring 14, and its upper limit position is determined by the stopper 3 being locked to the annular wall 5. ing.

In its raised position, the first valve 11 closes the first hole 7 of the annular wall 5 and also closes the upper half of the outlet of the second hole 8 into the inner tube 2 and opens the outlet through its lower half. gap 6 and outer tube 3
(Figs. 1 and 3), and closes the first hole 7 in the lowered position to allow passage between the first hole 7 and the inside of the inner pipe 2, and the exit of the second hole 8. The lower half of the tube is closed, and the gap 6 and the interior of the inner tube 2 can be accessed through the upper half (Fig. 2).

A second valve 18 is disposed near the lower hole 10 in the tip of the outer tube 3 so as to slide along the wall surface.
The valve 18 has a hole 19 penetrating it vertically, and a stepped portion 26 is formed in the middle of the hole 19.

The second valve 18 is always given an upward tendency by an extension spring 20 inserted between its lower surface and a seat 23 provided on the outer tube 3, and the upper limit position is determined by a stopper 21 provided on the outer tube 3. It is being The second valve 18 is adapted to close the lower hole 10 in its raised position and to close the lower hole 10 in its lowered position. Further, between the first valve 11 and the second valve 18 at the tip end of the outer tube 3, a third valve 16 having a stem 15 on the upper part is arranged. The stem 15 is slidably fitted with a cylindrical stopper 22.
A retaining spring 17 is provided that engages the upper surface of 2.

Further, a through hole 19 of the second valve 18 is provided at the lower end of the third valve 16.
A bouper 27 is formed which engages with a step portion 26 formed in the . The third valve 16 closes the through hole 19 of the second valve 18 in the raised position where the stop spring 17 locks on the upper surface of the cylindrical stopper 22, and the stem 15 of the third valve 16 closes the through hole 19 of the second valve 18.
The stem 12 of the valve l1 is engaged (FIG. 1), and the stop spring 17 closes the through hole 19 of the second valve 18 in the lowered position located on the lower surface of the cylindrical stopper 22 (the second figure). A required material source is supplied into the inner tube 2 and the gap 6 between the outer and outer tubes 2 and 3 of the injection device 1 as shown in FIG. 6.

In the figure, 28 is a curing agent tank connected to the inner pipe 2 by a pipe 29.
A pump 30 and a valve 31 are installed in this piping 29. 32 is a long gelling material tank connected to the outer pipe 3 by a pipe 33, a pump 34 and valves 35 and 36 are installed before and after the pump 34, respectively, and a water tank 37 for boring water is connected to the valve 36. 38.

Operations such as drilling a hole 40 in the ground 39 and injecting a chemical solution are performed using the above-mentioned device, and these operations will be explained below.

1 Hole excavation work (Figs. 1 and 7) Before starting excavation, insert a rod (not shown) into the opening □25 at the tip of the outer tube 3, push up the third valve 16, and push the stop spring 17 into the cylindrical stopper 22. By locking the third valve 16 to the upper surface of the third valve 16, the third valve 16 is held in the raised position as shown in the first figure.

Then, boring water is supplied from the water tank 37 to the gap 6 of the injection device 1 by the pump 34, and while the device 1 is rotated, the ground 39 is excavated in the same manner as a normal excavation method. At this time, the boring water supplied to the gap 6 flows into the tip of the outer tube 3 through the second hole 8 of the annular wall 5 and the lower half of its outlet, and then flows out through the through hole 19 of the second valve 18. The liquid is discharged from the tip entrance 25 of the pipe 3 into the hole 40, and in this way, a hole 40 of a predetermined depth is formed as shown in FIG.

2. Injection of gelatinized material (Figures 2 and 8) When the drilling of the hole 40 is completed as described above, the water supply to the gap 6 is stopped, and the pump 3 is poured into the inner pipe 2 to harden it. The agent and the long-set gelling material are simultaneously supplied to the gap 6 by the pump 34.

As a result, water pressure acts on the valve 11 from above, so that the valve 11 descends against the upward force of the spring 14, and the first hole 7 provided in the annular wall 5 opens as shown in FIG. As a result, the first hole 7 is fitted into the inner tube 2. Further, the lower half of the outlet of the second hole 8 is closed, and the gap 6 is opened through the upper half of the outlet.
and the inside of the inner tube 2 are now in communication. As a result, the long-headed gelling material that has flowed into the inner tube 2 from the gap 6 through the second hole 8 and the hardening agent in the inner tube 2 are mixed above the valve 11 to form a continuous gelling material. The twill-type gelled material thus constructed is discharged through the first hole 7 and the upper hole 9 of the outer tube 3 into the drilled hole 4, as shown in the eighth figure.
A river packer 41 is formed. Further, as the first valve 11 descends, the third valve 16 descends, and the stop spring 17 separates from the upper surface of the cylindrical stopper 22 and is located on the lower surface. will be closed.

3. Injection of long-form gelling material (Figs. 3 and 9) After the packer 40 is formed as described above, the supply of the curing agent into the inner tube 2 is stopped, and the long-form gel material is injected into the gap 6. Only the supply of recycled materials will continue.

As a result, the valve 11 is returned to its initial position by the upward force of the spring 14. Therefore, the first type gelling material supplied into the gap 6 flows into the distal end of the outer tube 3 through the second hole 8 of the annular wall 5 and the lower half of its outlet, and thereby the second valve 18
Since water pressure acts on the third valve 16 from above, the second valve 18 descends against the upward force of the spring 20 with its through hole 19 closed by the third valve 16, and exits. The lower hole 10 of the tube 3 opens □. As a result, the long gelling material passes through the lower hole 10 and is poured out into the hole 401 below the packer 41 as shown in FIG. 9, and is injected into the hole wall to form the long gelling material layer 42. It is formed. In this way, hole 4
Gelling material layer 4 which is impermeable and serves to strengthen the ground at the bottom of 0.
2 is formed, but if necessary, the device 1 is pulled up by the required amount and a gelling material layer 42' is similarly formed above it, as shown in FIG. 10. It can be repeated as many times as necessary.

Needless to say, it is not limited to the above-mentioned embodiments, but can be modified at will as long as it has a similar function without departing from the scope of the claims. Therefore, you can arbitrarily select the appropriate one. Since this invention is as described above, drilling is carried out by supplying boring water into the gap between the inner and outer tubes and injecting the water from the tip of the bag hawk to the outside, and when the hole of the desired depth has been drilled, the water is poured into the hole. The supply of water to the borehole was discontinued while the borehole was still in place, and a rattan-type gelling material was supplied through the inner pipe and the gap to provide it in the outer pipe in the hole a predetermined distance above the bottom of the hole. Fujio-type gelling material is poured out through the upper hole, thereby forming a packer in the area, and after this formation is completed, as in the case of combining the boring water,
The long gelling material is supplied into the gap and poured out below the packer through the lower hole provided in the outer tube, and in this way the pores of the long gelling material are filled. The gelling material can be infiltrated into the pores at the bottom of the packer while preventing it from overflowing to the outside, thereby strengthening the ground and reducing water infiltration. Medicinal solutions can be efficiently injected through simple operations.

In addition, a lower hole is provided at the tip of the outer tube, and the long-headed gelling material is discharged through the lower hole, so that the gelling material flows sideways and penetrates into the ground almost uniformly. Therefore, a gelling material layer with a good shape is formed, and the ground can be strengthened and water permeability can be sufficiently reduced.

[Brief explanation of the drawing]

FIG. 1 is a partially vertical front view of an embodiment of the invention,
Figure 2 shows the condition during excavation, Figure 2 is a partially longitudinal front view showing the condition of the same as above when instantaneous gelling material is injected, and Figure 3 shows the condition of the same as above when long-setting gelling material is injected. FIG. 4 is a partially longitudinal front view showing the line W- in FIG. 1.
5 is a cross-sectional view taken along line V-V in FIG. 1, FIG. 6 is a diagram showing the material supply system of the same as above, and FIGS. FIG. 10 is a schematic diagram showing the sequence of the construction method using the invention. 1... Chemical injection device, 2... Inner tube, 3... Outer tube, 4
...Drilling blade, 5...Annular wall, 6...
... Gap, 7... First hole, 8... Second hole, 9... Upper hole, 10... Lower hole, 11... ....First valve, 16...Third valve, 17
...Stopping spring, 18...Second valve, 19...Through hole, 25...Tip opening of outer tube, 28...
...Curing agent tank, 30, 34...Pump, 32...
... Final type gelling material tank, 37 ... Boring water tank, 39 ... Ground, 40 ... Hole drilling, 41
, 41'... Back, 42, 42'... Gelling material layer. Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fin 8 Fig. 9 Fig. l○ Fig.

Claims (1)

[Claims] 1. An inner tube is placed at a predetermined gap within an outer tube equipped with a digging blade at the tip, an annular wall is provided at the tip of the inner tube to close the gap, and a predetermined gap is provided to the annular wall in the circumferential direction. a first hole and a second hole are provided, an upper hole is provided in the outer tube that constantly communicates with the first hole, and a first valve that is always given an upward tendency is arranged near the tip of the inner tube, This first valve is
In the raised position, the first hole is closed, and the second hole is opened so as to communicate between the gap and the inside of the distal end of the outer tube,
In the lowered position, the first hole is opened to communicate between the first hole and the inside of the inner tube, and the second hole is opened so as to communicate between the gap and the inside of the inner tube. A lower hole is provided at a distance from the tip opening, a hole penetrating vertically is provided near the lower hole, and a second valve is disposed so as to open and close the lower hole with a constant upward tendency. A third valve is disposed between the valve and the first valve and is supported by a support member provided on the outer tube and is movable up and down.
A chemical liquid injector characterized in that the valve is configured to descend as the first valve descends to close the through hole of the second valve.