JPS629693B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chemical liquid injection rod for soil improvement, and in particular, it has a liquid guide pipe for feeding a chemical liquid to a chemical liquid injection part at the lower end, and a rod is provided on the outside of this liquid guide pipe. This relates to a type of chemical liquid injection rod in which a protective sleeve pipe is fitted, the chemical liquid injection part is drawn into the protective sleeve pipe during boring, and the chemical liquid injection part and packer are exposed from the protective sleeve pipe during chemical injection. .

Conventionally, when performing ground improvement by injecting chemicals, first a drilling rod is used to bore the target ground, then the drilling rod is pulled out, and a mechanical packer, strainer-type chemical injection part, etc. is used instead. The chemical liquid was injected by inserting a chemical liquid injection rod attached to the lower end. However, using two rods in this way is disadvantageous in terms of cost and labor, and furthermore, the hole wall collapses when the drilling rod is pulled out, making it difficult to insert the chemical injection rod. Due to problems such as interference,
A method has been proposed in which a rod for injecting chemical liquid is also used as a rod for drilling, and the rod can be used again for injecting chemical liquid without having to pull out the rod after boring. However, on the other hand, when bowling, this method
The rubber pack sleeve exposed around the rod is unavoidably damaged by friction with earth and sand and destroyed early, and the strainer of the chemical injection part is invaded by mud and slime, causing the chemical to spray out. There are problems such as interfering with Therefore, as mentioned above, a protective sleeve tube is fitted on the outside of the chemical injection rod, and during boring the chemical injection part is pulled into the protective sleeve tube, and when injecting chemical liquid, the chemical injection part is exposed from the protective sleeve tube and injected. A method was proposed.

The present invention provides such a chemical injection rod in which the mechanical pucker is inflated immediately after the pucker and the chemical injection part are exposed after boring work, thereby simplifying the series of operations up to the chemical injection. Moreover, the purpose is to bring about a reliable puller effect.

In order to achieve such an object, the present invention provides a liquid injection rod of the type described above, in which a rubber sleeve is attached to the liquid guiding pipe housed in the protective sleeve tube at a position above the liquid injection part, and the upper and lower ends thereof are sealed. and a fluid passageway opening into the inside of the rubber sleeve on one side and opening into a pressure fluid supply gap provided between the protective sleeve pipe and the liquid guide pipe inscribed thereon on the other hand. Further, it prevents communication between the fluid feeding gap and the fluid passage when the chemical liquid injection part is drawn into the protective sleeve pipe, and on the other hand, prevents communication between the two when the chemical liquid injection part is exposed. A means is provided to allow this.

In the chemical liquid injection rod according to the present invention, after the boring operation, pressure fluid is fed into the pressure fluid feeding gap provided between the sleeve pipe and the liquid conduit pipe inscribed therein, and thereby the liquid conduit pipe and the liquid conduit pipe are connected thereto. The protective sleeve pipe is pulled up while pressing the chemical injection part downward, or the entire rod is pulled up slightly after the boring operation, and then pressure fluid is fed into the pressure fluid feeding gap, thereby injecting the chemical liquid. Department and Patsukar were pushed out,
At the same time when the drug solution inlet and the rubber sleeve provided on the upper part are completely exposed, a fluid passage opening inside the rubber sleeve communicates with the fluid feeding gap, bringing pressurized fluid into the inside of the rubber sleeve to inflate it. Therefore, according to the present invention, the work flow from the boring to the completion of chemical injection preparation is extremely smooth and quick, and there is no damage to the rubber sleeve or clogging of the strainer in the chemical injection part during boring. etc. are completely avoided, resulting in a reliable packer effect and a reliable jetting of the chemical solution.

The present invention will be explained in more detail below with reference to the accompanying drawings.

1 and 2 schematically show the state of the chemical liquid injection rod according to the present invention immediately after boring and the state during chemical liquid injection, respectively.
1 is a chemical injection rod, 2 is a boring machine,
Reference numeral 3 indicates a rod lifting device which constitutes a part of the boring machine, and 4 a swivel attached to the upper end of the rod for introducing pressure fluid and chemical liquid into the rod. After boring, only the protective sleeve tube and casing 7 are pulled up to expose the chemical liquid injection part 5 and the packer 6, or the whole rod is slightly pulled up, as shown in FIG. The packer 6 is pushed out from the protective sleeve pipe, then the packer 6 is inflated, and then the chemical liquid is sent through the swivel 4 and is ejected from the chemical injection part 5 as shown by the arrow to be injected into the target ground.

Figures 3 to 5 show an embodiment of the drug injection rod according to the present invention, and Figures 3 and 4 show -
Figures 4 and 5 are continuous in the line area.

In this embodiment, the liquid guide pipes for feeding the chemical liquid to the chemical liquid injection part 5 at the lower end are an inner pipe 8 and an outer pipe 9.
The inner tube 8 extends from the swivel 4 to the middle of the chemical injection section 5 via the telescopic adjustment sections 8a, 8b (Fig. 3) and the connecting section 8c (Fig. 4). (Fig. 5), and on the other hand, the outer pipe 9 is connected to the inner pipe 8 from the My Bell 4 via the telescopic adjustment parts 9a, 9b (Fig. 3) and the connector 9c (Figs. 4 and 5).
It extends even further downward (Fig. 5). A gap is provided between the protective sleeve tube 7 and the liquid guide tube (outer tube) 9 inscribed therein on the outside of these liquid guide tubes 8 and 9 and the chemical injection part 5 connected thereto.
Moreover, they are fitted in such a way that relative sliding movement in the axial direction is possible. At the lower end of this protective sleeve tube 7 is a metal crown 11 having a digging blade 10.
are screwed together.

As shown in FIG. 4, a reduced warp section 9d is formed over a certain length range on the outer periphery of the outer tube 9 above the drug solution injection part 5, and a packer is attached to this reduced warp section. A rubber sleeve 12 is fitted for effect, the upper and lower ends of which are fastened by clamps 13 and thereby sealed against the outer tube 9.

In order to bulge out the rubber sleeve 12,
On the one hand, a fluid passage 1 opens inside the rubber sleeve 12 near the center of the warp reduction section 9d.
4 extends upward inside the outer tube 9, and at its upper end there is a pressure fluid supply gap 15 provided between the protective sleeve tube 7 and the liquid guide tube inscribed therein (i.e., the outer tube 9). It is open to (Figure 3). An O-ring 16 is fitted in the outer tube 9 above this upper opening, so that the fluid passage 14 can be closed during boring.
is isolated from the pressure fluid feed gap 15. However, for example, when the protective sleeve tube 7 is pulled up and reaches its upper end position (FIG. 6) prior to injecting the chemical solution, the annular recess 17 provided on the inner peripheral surface of the sleeve tube 7 connects the gap 15 and the passage 14. bring about communication. In this case, in order to prevent the pressure fluid from escaping downward, another O-ring 18 is fitted in the outer tube 9 below the upper opening of the fluid passage 14.

As shown in Figures 3 and 6, O-ring 1
A stepped portion 9e is formed in the outer tube 9 above the gap 15, and this stepped portion acts on this stepped portion to generate a force that pushes the outer tube 9 downward. The protective sleeve tube 7 is pulled up. In some cases, the entire rod may be first pulled up a necessary distance, and then pressurized fluid may be applied to push out and expose the drug inlet and packer.

The detailed structure of the chemical liquid injector 5 shown in FIGS. 5 and 7 is not a subject of the present invention, so a detailed explanation thereof will be omitted, but its operation will be self-evident from the explanation related to its operation below. It will be.

First, during boring, the chemical injection rod is in the state shown in FIGS. 3 to 5, and in this state, the rod is rotated and gradually pushed into the ground, and at the same time, excavation water is pumped into the inner pipe 8. The excavation water reaches the chemical injection part 5, and from there flows through the lower side opening 19b of the piston member 19 and the check valve mounting member 2.
It passes through the passage 20a of 0, pushes down the valve ball 21, and is ejected downward. After boring has been completed to a predetermined depth, the supply of drilling water and the rotation of the rod are stopped.

Next, a pressure fluid supply gap 15 is created between the protective sleeve tube 7 and the liquid guide tube (outer tube 9) inscribed therein.
A pressure fluid of, for example, 7 kg/cm ² is fed into the tube, and this pressure fluid acts on the stepped portion 9e of the outer tube 9 and presses the outer tube 9 and the chemical liquid injector 5 connected thereto downward. In this state, the protective sleeve tube 7 is pulled up, and the chemical injection part 5 and the rubber sleeve 12
is exposed in the borehole. Incidentally, when the protective sleeve tube 7 is pulled up, the upper halves of the inner tube 8 and the outer tube 9 follow the movement of the sleeve tube 7 by the action of the expansion/contraction adjustment parts 8a, 8b and 9a, 9b, and swivel 4. This avoids discrepancies in the mutual positions of the upper ends of the tubes.

As soon as the protective sleeve tube 7 is pulled up and reaches its upper end position (FIG. 6), the pressure fluid supply gap 1
The pressure fluid in 5 enters the fluid passage 14 through the annular recess 17 and reaches the back side of the rubber sleeve 12, causing it to bulge. After the rubber packer is inflated in this way, one of the two types of chemical liquids constituting the instant-setting gelling agent is fed to the outer tube 9, and this chemical liquid reaches the chemical liquid injection part 5 ( Figure 5),
Chemical liquid passage 2 between inner tube 8 and cylinder member 22
3, the piston member 19 is pushed down to the lower position shown in FIG. As a result, cylinder member 2
The upper side opening 22a of 2 opens into the medicinal liquid passage 23 and allows the passage to communicate with the closed space 25 inside the elastic sleeve 24, and at the same time from the lower side passage 19b of the piston member 19 on the one hand. On the other hand, the upper side passage 19a of the same member coincides with the lower side opening 22b of the cylinder member 22, and the inner tube 8 is connected to the closed space 2.
It is possible to communicate with 5. In this state, the inner tube 8
The other of the two types of chemical liquids is fed to the opening 2, and the two types of chemical liquids from the outer tube 9 and the inner tube 8 push aside the backflow prevention members 26a and 26b, respectively, and enter the opening 2.
2a and 22b flow into the closed space 25, where they join and mix with each other. When the closed space 25 is filled with the mixed chemical solution and the pressure increases, the chemical solution pushes open the slit formed in the elastic sleeve 24, is discharged from the chemical solution outlet 9a provided in the outer tube 9, and is discharged from the wire 2.
It is ejected uniformly from the slits between the windings or coils and permeates into the target ground. The chemical solution is placed in the elastic sleeve 2.
When passing through the slits No. 4 and slits between the windings, the material undergoes a further mixing action and becomes a complete instant-setting gelling agent (gelling time of 20-odd seconds or less) and is injected into the ground.

Next, the liquid feeding to the inner tube 8 is stopped, or the liquid feeding to the inner tube 8 is switched to a long-term gelling agent (gelling time is about 1 to 90 minutes) similar to that used for the outer tube 9, and the instant-setting type Improvements are made to unimproved zones that were beyond the reach of gelling agents. In other words, the cylindrical region having a thickness approximately corresponding to the winding region of the wire 27 (ie, the strainer forming portion) is completely improved.

As described above, in the chemical liquid injection rod according to the present invention, after boring, the chemical liquid injection part and the rubber sleeve for the packer are exposed from the protective sleeve tube, and at the same time the packer is automatically inflated, so that the chemical liquid can be injected. It shortens the working time and enables quick chemical injection, and of course, a mechanical gasket completely prevents the chemical from escaping.
Furthermore, the effect of completely protecting the packer and the chemical injection part from friction and clogging can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the state of the chemical liquid injection rod according to the present invention immediately after boring, FIG. 2 is a schematic diagram showing the state during chemical liquid injection, and FIG. 3 is a schematic diagram showing the upper part of the chemical liquid injection rod according to the present invention. Longitudinal sectional view shown, No. 4
The figure is a vertical cross-sectional view showing the vicinity of the pack car, Figure 5 is a vertical cross-sectional view showing the vicinity of the chemical injection part, and Figure 6 is a vertical cross-sectional view showing the vicinity of the liquid injection part.
In the rod shown in the figure, a vertical cross-sectional view of the vicinity of the packer is used to explain the flow path of the pressure fluid when the packer is inflated, and FIG. 7 is a vertical cross-sectional view showing the chemical liquid injector in a state when the chemical liquid is injected. 1... Rod for chemical liquid injection, 5... Chemical liquid injection part,
7...Protective sleeve tube, 8, 9...Liquid guide tube (8
...Inner pipe, 9...Liquid guide pipe inscribed in the outer pipe or protective sleeve pipe), 12...Rubber sleeve, 14...
...Fluid passage, 15...Pressure fluid feeding gap.

Claims (1)

[Claims] 1 It has a liquid guide pipe for feeding the chemical liquid to the chemical liquid injection part at the lower end, and a protective sleeve pipe is fitted on the outside of this liquid guide pipe, and the chemical liquid injection part is connected to the protective sleeve during boring. In a type of drug injection rod that is pulled into the pipe and in which the drug injection part and packer are exposed from the protective sleeve pipe when injecting the drug, there is a part above the drug injection part in the liquid guide pipe inscribed in the protective sleeve pipe. A rubber sleeve is fitted with the upper and lower ends sealed, and one side is opened inside the rubber sleeve, and the other side is a pressure fluid supply provided between the protective sleeve pipe and the liquid guide pipe inscribed therein. A fluid passageway opening into the feeding gap is provided, and furthermore, communication between the fluid feeding gap and the fluid passageway is prevented when the liquid medicine injection part is being drawn into the protective sleeve tube, and on the other hand, the liquid medicine injection part is exposed. A rod for injecting a chemical solution for ground improvement, characterized in that it is provided with a means for allowing communication between the two when the two are connected.