JPS6252084B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of injecting a chemical solution by partially reducing the diameter of an injection tube to form a guiding section in an injection section.

Generally, an injection port is formed on the peripheral wall or the tip of the injection pipe, and the injection pipe is installed in a specified ground while drilling a hole, and the chemical solution is injected from the injection port into the ground of the surrounding wall.
Since the pressure of the chemical liquid is applied almost exclusively to the opening area of the injection port, injection is not reliable, and it has been believed that injection must be performed at a certain degree of pressure in order to perform the desired injection. In other words, theoretically, when using the conventional method, as shown in Figure 3, the injection port H
The chemical solution G' injected from the injection port H has a large portion corresponding to the area of the injection port H, and other portions are extremely small. In the figure, the L' line indicates the pressure distribution curve.

The present invention is completely different from the above-mentioned method in terms of injection principle, and as shown in FIG. 1, uniform pressurized injection is performed over an area larger than the injection port.

The present invention will be explained below with reference to the drawings. FIGS. 1 and 2 are diagrams showing the principle of the injection method of the present invention.
1 is the injection tube main body, and the liquid injection port 2,
3 is formed, and the tip opening serves as an air jet port 4. In the vicinity of the injection ports 2 and 3, the pipe diameter is reduced to form a guide portion, and as a result, guide injection spaces S ₁ and S ₂ are formed between the injection ports and the hole wall. this space
S ₁ and S ₂ are constructed by making the tube axes O ₁ and O ₂ of the portions eccentric from the tube axis O of the injection tube main body 1 toward the injection ports 2 and 3 side.

Now, using the injection tube configured in this way,
When a medical solution is injected from the injection port 2 and/or the injection port 3 while rotating this, the spaces S ₁ and S ₂ are filled with the medical solution. When the chemical solution is further injected, the chemical solution coming out of the injection ports 2 and 3 acts to push out the chemical solution that filled the spaces S ₁ and S ₂ as a whole, and together with the filled chemical solution, it infiltrates into the surrounding ground. I'll go. Therefore, the injection pressure acts on the medicinal liquid over a wide range approximately equal to the surface area of the space (the surface area when the space is assumed to be one object). As a result, uniform injection can be performed over a wide range with low injection pressure.

Also, when this eccentric injection tube is rotated around the axis,
Since the filled chemical liquid in the spaces S ₁ and S ₂ or the collapsed soil or slime from the hole wall are constantly moved by the peripheral wall surface of the guiding part, the chemical liquid that stays in the spaces S ₁ and S ₂ and tries to solidify. Solidification is prevented, and agglomeration of the surrounding wall ground and the chemical solution in the immediate vicinity is also prevented. As a result, as long as the injection tube is rotating, the space
S ₁ , S ₂ and the surrounding area are always in a fluid state, and the injected drug solution acts uniformly throughout, and there is no effect of external factors that try to block injection over time. As a result, the feed pressure almost becomes the injection pressure into the ground, which is extremely effective when performing seepage injection at low pressure.

If we consider the conventional injection method again, we can see that elements that try to prevent injection occur over time due to the solidification of the injected chemical solution and the clogging of the injection port due to the collapse of the hole wall. become larger. Therefore, if we increase the chemical liquid delivery pressure in response to this, the chemical liquid will not be uniformly injected into the surrounding ground, but will find weak spots and inject the chemical liquid only there. , the amount of chemical solution escaping outside the predetermined range increases. However, according to the present invention, such a situation can be reliably prevented as described above. On the other hand, with the strainer injection method, the opening area of the injection port is large, so the contact area between the surrounding ground and the chemical solution is large, so it is suitable for low-pressure seepage injection, but the above-mentioned drawbacks still remain.
It is not practical due to problems such as difficulty in pulling out the injection tube.

As mentioned above, the method of the present invention is effective when a chemical solution with a gel time of 60 seconds or more is infiltrated into sandy ground or the like at low pressure. However, gel time
When trying to strengthen a sticky land board with a so-called instantaneous chemical solution within 30 seconds, more preferably within 15 seconds, it functions effectively from another perspective.

In other words, when injection is performed while rotating the eccentric injection tube, the solidified or semi-solidified liquid filled in the spaces S ₁ and S ₂ is sequentially compressed and pressurized by the eccentric part of the injection tube as the eccentric injection tube rotates. . When the pressurized state reaches its maximum, the injection port will be located there, and the injection pressure from the injection port will be added to the compression pressure on the solidified or semi-solidified material, so rotation using the eccentric injection tube will not be performed. The injection is carried out at a higher pressure than the case. This relationship is very similar to compressing a mixture (corresponding to a chemical liquid) into a rotor housing (corresponding to a hole wall in the ground) using an eccentric rotor (corresponding to an injection pipe) in a rotary engine.

Note that the L1 line in Figure _2a shows the pressure distribution curve when injecting a long gel time chemical solution, and the L2 line in Figure _2b shows the pressure distribution curve when injecting an instant-setting chemical solution. Yes, pressure distribution curve of conventional method
The difference between them is clear when compared with L′.

Next, an example of an apparatus for implementing the construction method of the present invention is shown in FIG. 5 and below. The injection tube main body 1 is connected to a swivel via a connecting pipe, and three flow paths are independently configured up to the injection tube main body 1. 1
0 is an outer tube of the injection tube main body 1, and a connecting tube 12 and a tip shoe 16 having a cutting blade 14 are screwed to the tip side (right side in FIG. 5) of the outer tube. Further, a connecting tube 18 is connected to the proximal end side of the outer tube 10. Reference numeral 20 denotes a valve chamber provided inside the outer tube 10, and a spool valve 22 is installed inside the valve chamber 20. Reference numeral 24 denotes a flow path element installed in the connecting pipe 18 with a gap 26, and a second A liquid path 28 and a second B liquid path 30 are independently formed in this flow path element 24. Further, in the flow path element 24, there is a joint 34 constituting a first A liquid path 32 that communicates with the second A liquid path 28, and a first B liquid path 36 that communicates with the second B liquid path 30.
The joints 38 constituting the two are each screwed together.
The space between the joints 34 and 38 and the connecting pipe 18 forms a first C channel 40. Further, both sides of the channel element 24 are chamfered, and this space and the gap 26 constitute a second C channel 42.

On the other hand, a first joint 44 is installed at the distal end of the outer tube 10, and a second joint 46 is installed at the distal end of the connecting pipe 12. In addition, the valve chamber 20 has outlet ports 48 and 5.
0 is formed symmetrically with respect to the center, and the half circumference of the valve chamber 20 forms a guide gap 52 with the outer tube 10, and this guide gap 52 communicates with the outlet ports 48, 50, and It communicates with a first injection port 54 (corresponding to the injection port 2 described above). A guide hole 56 is formed on the distal end side of the outlet 48 .

The spool valve 22 is always urged toward the proximal end by a spring 58 whose seat is the end surface of the first joint 44 . The spool valve 22 has a third A liquid path 60.
A third B liquid path 62 is formed and communicates with the second A liquid path 28 and the second B liquid path 30, respectively. Outflow ports 64 and 66 are formed on the proximal end side of the outflow ports 48 and 50 of the spool valve 22, and a guide hole 68 that corresponds to the non-moving guide hole 56 of the spool valve 22 is formed. On the other hand, the valve chamber 20
One side is chamfered to form a third C flow path 70 communicating with the second C flow path 42, and the other side is chamfered to form a third C flow path 70 communicating with the second C flow path 42.
6 to the tip of the valve chamber 20
is formed.

Further, the inside of the tip of the valve chamber 20 forms a fourth C flow path 74, which communicates with the third C flow path 70. Further, in the first joint 44, a fifth A channel 76 is formed that extends from the circumference to the center and exits to the bottom, and a fifth C channel 78 that passes from the center to the side and exits downward is formed. And the first joint 44 and the second joint 4
6 is connected by a connecting pipe 80.
The gap between the connecting pipe 80 and the connecting pipe 12 is a sixth C flow path 82, and a check valve (see Fig. (not shown) etc. for communication. Further, a sixth A flow path 86 is formed in the second joint 46, and the sixth A flow path 86 is closed off by a check valve 88 in the middle thereof. At the tip of the second joint 46, there is a seat body 90.
is screwed on, and the inside thereof forms a seventh A flow path 92. A spring 94 urges the check valve 88 to close the sixth A flow path 86 using the seat body 90 as a seat. Reference numeral 96 denotes a spout (corresponding to the spout 4 described above) formed in the tip shoe 16.

On the other hand, in the vicinity of the formation position of the first injection port 54 and the formation position of the second injection port 84, the pipe diameters D ₁ and D ₂ of the injection pipe are smaller than the pipe diameter D of the injection pipe main body 1, and the axis thereof It is eccentric from the center O toward the injection ports 54 and 84, and forms a guided injection space.

In the injection device configured in this way, when liquid A is now pumped, liquid A will flow through each of the liquid A channels 32, 28,
60 in order, through the guide holes 68 and 56, and then
The liquid passes through the liquid paths 72 and 76, passes through the interior of the connecting pipe 80, reaches the sixth A flow path 86, and is discharged forward from the spout 96 while pushing down the check valve 88.

Also, when C liquid is pumped, each of the C flow paths 40, 4
2, 70, 74, 78, and 82, and is injected into the surrounding ground from the second injection port 84.

When liquid B is further pressurized, each B flow path 36,
Pass through 30 and 62. At this time, when liquid A is also pumped as described above, the pressure of transporting both liquids A and B overcomes the biasing force of the spring 58, and the spool valve 2
is pushed down for the first time. As a result, the outlet 64,
66 coincide with the outlets 48 and 50, respectively, liquid A enters the guide gap 52 from the outlet 48, and liquid B enters the guide gap 52 from the outlet 50. These liquids A and B contact and mix countercurrently at the inlet of the first injection port 54 to become a uniform liquid, which is injected from the first injection port 54 into the surrounding ground. Note that as a result of the spool valve 22 being pushed down, the guide holes 68 and 56 become misaligned, and the flow of liquid A toward the tip side is blocked.

In this way, according to the injection device, liquid A can be discharged alone from the spout 96, liquid C can be discharged alone from the second injection port 84, and both liquids A and B can be passed through the outlet ports 48 and 50 to the guide gap 52. If liquid A or liquid B is allowed to flow through the outlet port 48 or 50 and be discharged from the first injection port 54, and if the individual feeding pressure is made larger than the biasing force of the spring 58, Various discharge methods can be selected, such as discharging from one injection port 54.

In addition, as liquid C, at the proximal end of the injection tube,
1.5 A two-component curing chemical can be delivered using a Y-shaped pipe like the shot construction method.

The injection may be carried out by an appropriate method such as a conventional ascending step method or forward step method. In addition, from the first injection port 54, a chemical solution with a gel time of 30 seconds or less is injected, and a pack solidified body of the drug solution is created in the vicinity thereof, and after the formation is completed, a gel solution with a relatively long gel time is injected from the second injection port 84. It is possible to discharge a chemical solution (for 30 seconds or more) and inject it into the surrounding ground.

On the other hand, the spout 96 is used as a spout for drilling water during drilling, but air is spouted so that, for example, the chemical solution discharged from the second injection port 84 does not detour and enter the spout 96 and block it. Good.
Furthermore, when injecting the drug solution from the first injection port 54,
If air is discharged from the second injection port 84 through the C flow path, the jet port 96 is prevented from being blocked and the air is prevented from escaping to the proximal end of the injection tube. It can be used as an indicator that the body has been formed.

In addition, the guiding part in the present invention means a part of the injection tube in which the wall surface of the tube is modified, the irregularly shaped part fluidizes the vicinity of the injection part, and guides the injection of the drug solution. Further, the term "rotation" as used herein includes, for example, an oscillating rotation in which the object is once rotated 360 degrees clockwise and then rotated 360 degrees counterclockwise.

As described above, in the present invention, the injection part is formed by deforming the injection part in the vicinity of the injection part, and a guided injection space is formed between the injection pipe and the hole wall, so that the contact area of the chemical solution with the ground is reduced. The size allows the chemical solution to be injected gradually into the surrounding ground over a wide area at once. Therefore, it has a remarkable effect when infiltrating and injecting at low pressure (for example, 10 kg/cm ² or less).

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing the injection principle of the present invention, Figure 2
Figures a and b are X-X cross-sectional views for different gel times, Figure 3 is a schematic diagram showing the conventional method, Figure 4 is a Y-Y cross-sectional view, and Figure 5 is an example of an injection device. 6 to 10.
The figures are cross-sectional views of FIG. 5. 1... Injection pipe body, 2, 3... Inlet, S ₁ , S ₂
...Induction injection space.

Claims (1)

[Claims] 1. An injection port is formed on the peripheral wall of the injection tube, and by eccentrically centering the axis of the injection tube toward the injection port near the injection port, a guided injection space is created between the injection tube and the hole wall, and two-liquid curing is performed. A chemical injection method characterized by mixing grout in advance before the injection port, and then injecting the grout into the surrounding ground from the injection port, and rotating the injection pipe during the injection.