JPS585706Y2 - Chemical injection tube structure - Google Patents

Description

[Detailed description of the invention] The disclosed technology makes it possible to press an elastic packer provided in the vicinity of the drilled part of the outer tube of the soil improvement chemical injection tube by the downward movement of the inner tube inserted into the outer tube. It belongs to the technology that makes it possible to prevent uploads.

According to this invention, an inner tube is inserted into an outer tube that integrally has a hole-drilled portion at the bottom, and a packer provided at a position above the nozzle hole formed in the outer tube is pressed by a predetermined suppression mechanism. This invention relates to a chemical liquid injection tube structure that can be suppressed downward, and in particular, a ball valve is placed and locked on the upper end surface of the inner tube, and a protrusion is provided at a set position of the inner tube. is laterally extended so as to be able to abut and press against the upper surface of the packer formed of an elastic material, and
The packer has a chemical liquid injection tube structure wrapped around a position above the nozzle hole provided in the outer tube.

As is well known, in the past, in chemical injection for ground improvement, etc.
Adjust the gel time at the beginning of drug injection.

For example, a small amount of instant setting injection material for 4 to 5 seconds is injected, the area near the injection hole of the injection tube is hardened with a short gel of the instant setting injection material to assist the packer, and then a chemical solution with a slow gel time is injected. Packer construction that injects chemicals into the ground evenly is widely used.

In addition, in the conventional method, in order to ensure that the gel packer of the above-mentioned drug solution is carried out, a suitably formed packer is attached to the injection tube, and the drug solution is injected at the start of each step. Packing of the flash-setting injection material with gel is performed reliably to prevent axial diffusion of the drug solution, so-called slime-up, and to ensure uniform penetration injection at each step.

However, in the prior art described above, the packer attached to the injection pipe was operated from the ground using a link mechanism or the like, which was attached near the nozzle hole.
When injecting chemical liquid from the ground at a set depth, it is necessary to prepare a long link mechanism, which has the disadvantage of a complicated momentum structure, and it is difficult to operate at a point with a large depth. There is a drawback.

Alternatively, there is a method in which a piston mechanism is attached to the packer and the packer is operated by hydraulic pressure via the piston mechanism without using the seed link mechanism or the like.

There is also the disadvantage that the mechanism becomes complicated.

Therefore, there was a disadvantage that initial and maintenance costs were high.

The purpose of this invention was to solve the problem of the one-way packer liquid injection tube structure based on the above-mentioned prior art, by making the inner tube inserted into the outer tube of the chemical injection tube move downward by the pressure of the chemical liquid. An excellent chemical solution that eliminates the disadvantages of the conventional technology by making it possible to operate the elastic packer provided near the drilled part of the outer tube by the downward movement of the It is intended to provide an injection tube structure.

The structure of this invention, which meets the above objectives, is that when drilling a hole using a chemical injection tube, water passes through the inner tube and is ejected from the tip of the drilling part to provide for drilling, while when injecting a chemical, a ball valve is attached to the inner tube to allow water to flow through the inner tube. The inner tube moves downward through the hydraulic pressure, and as the inner tube moves downward, an elastic packer provided at a position above the jet hole of the outer tube is compressed and packed into the drilled hole. The gist of this invention is to allow the chemical solution ejected from the ejection hole to efficiently permeate without being diffused in the axial direction.

Next, one embodiment of this invention will be described below based on the drawings.

1 is a chemical liquid injection tube that embodies the gist of this invention.

The tube body includes an outer tube 2, an elastic packer 3 wrapped around the 20th connection setting part of the outer tube, a drilled part 4 formed by a well-known metal crown integrally connected to the tip of the outer tube 2, as well as,
The inner tube 5 is inserted into the outer tube 2 so as to be relatively movable.

Thus, the outer tube 2 has a lower outer tube 2 than an upper outer tube 21.
2 are connected to each other via a threaded portion 23 to form a single unit,
The upper outer tube 21 has a large diameter part 211 and a small diameter part 212, and three rectangular windows 213, 213, 213 are provided in the upper part in a manner extending over both the large diameter part 211 and the small diameter part 212. A hole is provided in the circumferential surface of the outer tube 210 along the axial direction.

Further, a groove portion 214 is provided on the inner peripheral surface of the large diameter portion 211 of the upper outer tube 21 along the curved surface.

On the other hand, the lower outer tube 22 has a predetermined number of ejection holes 221, 221. ... has been drilled.

Further, the drilled hole portion 4 is integrally connected to the lower end of the lower outer tube 22 with a screw.

Further, the inner tube 5 is inserted into the outer tube 2 so as to be relatively movable, and the inner tube 5 has a rubber stopper member 51 at its lower end.
A metal single packer 52 and an elastic spring 53 are attached to the plug member 51 as shown in the figure, and are engaged with the honeycomb 222 of the lower outer tube 22 of the outer tube 2, so that the inner tube 5 is connected to the outer tube. It is supported elastically against the inner surface of the tube 2.

Further, a predetermined number of jet ports 54 , 54 , . The ball valve 6 is dropped onto the tapered surface 56 from an upper opening (not shown) so that the opening 55 can be sealed.

A seal ring 57 is wound around the outer peripheral surface of the inner tube 5 near and below the upper end opening 55 of the inner tube 5.
A plurality of seal rings 8 are bored, and another seal ring 57 is wound around the circumferential surface of the inner tube 5 below the chemical liquid inlet 58 .

The seal ring 57' is set at the lower position.

Protrusions 59, 59° 59 are attached to the inner tube 5 by appropriate welding by fitting into the window 213 bored in the upper outer tube 21, so that they move up and down together with the inner tube 5. It is being done.

3 is a rubber packer as an elastic packer, and the protrusions 213, 213.3 of the upper outer tube 21 are provided. The washer 7 is wound around the small diameter portion 212 having the packer 3.
The washer 7 is set in contact with the upper end surface of the protrusion 59.
so that it touches the bottom surface of the

As a result of the downward movement of the projection 590, a pressing force is applied to the packer 3 in the axial direction via the washer 1.

In the above configuration, in the state shown in FIG. 59 is fixedly set by abutting the upper surface of the window portion 213 formed in the upper outer tube 21, and in this state, drilling into the ground by the chemical injection tube 1 is started.

In the above-mentioned drilling work, high-pressure water is pumped from the ground through either one of the double pipes (not shown) provided on the upper outer pipe 21, passes through the mixing section 8, and reaches the vicinity of the opening 55 of the inner pipe 5. The outer circumferential surface of the inner tube 5 and the inner circumferential surface of the upper outer tube 21 are
Since it is sealed by the seal ring 57, the pumped water passes through the interior of the inner tube 5 through the opening 55.

The spout ports 54, 54. ...and in this state, the single packer 5 attached to the tip of the inner pipe 5
2 and the inner circumferential surface of the lower outer pipe 22, the water pumped through the gap is ejected into the ground from the drilled part 4 and applied to the pipe body. The downward pressing force and rotational force used to efficiently drill holes.

The above-mentioned drilling operation is completed at a predetermined depth through joint coupling, and after the chemical solution injection tube 1 reaches a predetermined depth □, injection of the reference chemical solution is started while giving rotation to the injection tube.

When starting the injection of the chemical liquid, the ball valve 6 is inserted from the ground into the inner pipe (not shown) of the chemical liquid injection pipe 1.
Insert.

The inserted ball valve 6 passes through each connected inner tube of the drug solution injection tube 1 and is seated on the tapered surface 56 formed in the upper opening 55 of the inner tube 5.

The upper opening 55 is sealed.

Thereafter, when 1, for example, 1.5 shot type chemical liquid is separately pumped from the ground into the inner and outer pipes (not shown) of the chemical liquid injection pipe 1, the chemical liquids are mixed in the mixing section 8, and the liquid pressure causes the ball valve 6 to flow. The upper opening 55 of the inner tube 5 that is sealed is pressed downward, and therefore, as shown in FIG. 2, the inner tube 5 is pushed down against the elastic force of a spring 530 attached to the lower tip. It will be done.

Therefore, by pushing down the inner tube 5, the seal ring 57 wrapped around the outer peripheral surface of the inner tube 5 near the upper end opening 55 of the inner tube 5 is pushed down, and the second seal ring 57 is pushed down. As shown in the figure, a gap is formed opposite to the groove 214 provided on the inner circumferential surface of the upper outer tube 21, and the mixed chemical liquid flowing down the gap is directed to the seal ring 57 and the seal ring. Between the seal ring 57' wrapped around the outer circumferential surface of the inner tube 5 further below the inner tube 5, the chemical liquid flows into the inlet 58 provided in the inner tube 5 and flows into the inner tube 5. flows down and is ejected out of the inner tube 5 from the ejection ports 54, 54, . . . .

Since the inner tube 5 is pushed down against the spring 53 attached to the lower end by the liquid pressure of the mixed chemical as described above, the single packer 52 and the lower outer tube 22 attached to the lower end are The inner circumferential surfaces are closely and sealed.

Therefore, the jet ports 54, 54. The chemical liquid ejected from the above-mentioned ejection hole 221 provided in the lower outer tube 22.
221, it is ejected into the ground only from...

When the inner tube 5 is pushed down in the above chemical injection process, the protrusions 59, 59, 59 integrally welded to the inner tube 5 are also integrated along the protrusions 213...□. The small diameter portion 212 of the upper outer tube 21 is lowered to
Since the packer 3 wrapped around is pressed downward,
As shown in FIG. 2, the packer 3 bulges laterally and expands in diameter by the amount of compression, thereby creating a tight seal with the drilled holes.As a result, as described above, the jet holes 221, 221,・
- The sprayed chemical solution does not spread above the packer 3, and there is no slime-up.

Further, when the pressure feeding of the chemical liquid is stopped, the pressing force on the ball valve 6 seated at the upper end opening 55 of the inner tube 5 is removed, and therefore the inner tube 5 is moved by the elasticity of the spring 530 attached to the lower end. The protruding portion 5 is returned to the initial position before the drug liquid is forced to be fed by the force, and is further integrated with the inner tube 5.
9,59°59 also moves upward, and the projections 59,59,
59, the packer 3 to which the pressing force was applied via the washer 7 is also removed from the pressing force, and returns to the state shown in FIG. 1 by the elastic force of the packer 3 itself.

Then, in the above state, the chemical liquid injection tube structure 1 is raised and stopped at the set position, and as a first stage process, the chemical liquid is injected by the same process as described above, and the process is further stepped up. The chemical liquid injection work is completed by injecting the chemical liquid to a position close to the ground.

In the above operation, first, a chemical with a short gel time is fed to form a gel packer with the chemical in the gap between the chemical injection tube 1 and the drilled hole, and then a slow-setting chemical is fed under high pressure. It can also be used in conjunction with a method that allows it to penetrate evenly into the ground, and in this case it is extremely effective for fine sand layered ground.

Note that the embodiment of this invention is not limited to the above-mentioned embodiment.1 For example, the shape and number of the protrusions attached to the inner tube can be selected as appropriate, and the material of the packer rubber can also be elastic. If so, it can be selected appropriately.

As described above, according to this invention, the inner tube inserted into the outer tube of the drug solution injection tube is moved downward by hydraulic pressure, and the downward movement of the inner tube causes the inner tube to be moved near the drilled part of the outer tube. By making the provided elastic packer operable, an excellent effect can be achieved in that the chemical solution can be uniformly permeated into the soil by injection of the chemical solution with extremely high efficiency.

In addition, there is no need to equip a rod or the like separately from the chemical liquid injection tube to operate the packer, and therefore, there is an excellent effect that chemical liquid can be injected at a set depth.

Furthermore, the structure allows the packer to function automatically at the same time as the chemical solution is injected, making it extremely easy to work with.

Another advantage is that reliable work can be carried out.

Furthermore, since the mechanism is very simple and easy to manufacture, there is an advantage that it can be manufactured at low cost.

In addition, there is an advantage that maintenance is easy because the packer rubber and the like can be easily replaced.

In addition, since the instant setting and loosening chemical liquid can be used freely, there is an excellent effect of being able to flexibly change the injection mode depending on the properties of the ground.

[Brief explanation of drawings]

The drawings are explanatory diagrams of one embodiment of this invention, in which Figures 1 and 2 are overall cross-sectional diagrams, Figure 3 is a perspective diagram of the inner tube part, and Figure 4 is a diagram illustrating an inner tube portion.
FIG. 5 is a perspective view of the washer, FIG. 5 is a perspective view of the packer rubber, and FIG. 6 is a perspective view of the outer tube. 4...Drilled part, 2...Outer tube, 5...
...Inner pipe, 3...Packer, 59...
・Packer pressing mechanism, 1...chemical injection pipe structure,
6...Ball valve, 59...Protrusion. 3...Elastic packer 221...Blowout hole.

Claims (1)

[Scope of utility model registration request] A drug solution injection tube structure comprising an outer tube integrally having a downwardly bored portion, an inner tube inserted into the outer tube, a packer provided at a set position of the outer tube, and a pressing mechanism for the packer,
A ball valve can be installed at the upper end of the inner pipe, and
A protrusion is laterally formed at a set position on the inner pipe to form a suppressing mechanism against the upper surface of the elastic packer, and the packer is wound at a set position above an ejection hole provided in the outer pipe. A chemical liquid injection tube structure characterized by: