JPS6358970B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chemical liquid injection device, and the purpose of the present invention is to facilitate the formation and processing of the flow paths when configuring multiple flow paths, to achieve various merging modes, and to facilitate replacement in the event of damage. The goal is to provide equipment.

In recent years, inhomogeneous soft ground centered on alluvium,
The method described in JP-A-52-48217 is widely used because it can perform stabilization treatment on sandy soil saturated with groundwater or on complex ground mixed with clayey soil. There is. however,
In this construction method, when each grout is discharged from a pair of discharge ports to join and mix by contact, it is not necessarily the best practice to angle the discharge ports and have them uniformly merge on the outside. The inventor's experiments have revealed that there is no such thing.

In other words, it is better to use a method in which the two liquids are brought into contact with each other in a countercurrent manner inside the injection tube, especially when handling a drug liquid with a short gel time.

However, in the device described in the above publication, the spool valve is directly installed inside the outer tube. the result,
It has been practically difficult to form a countercurrent merging channel in terms of processing.

Therefore, the present invention has been proposed, in which a valve chamber is provided within the outer tube, and a spool is housed inside the valve chamber of this valve chamber.

The present invention will be explained below using specific examples. FIG. 1 is a longitudinal sectional view showing the device of the present invention in a state before operation. Each unit injection pipe is connected to the upper part of the figure.
The upper part is a swivel, but it is not shown. 1 is an outer tube, and a joint tube 2 and a cutting blade 3 are connected to the lower part of the outer tube. An injection port 4 is formed in the outer tube 1 . Further, inside the outer tube 1, a valve chamber portion 5 having a valve chamber 5a is housed. A spool valve 6 is disposed in the valve chamber 5a so as to be able to slide vertically, and the inside of the valve chamber 5a is connected to the base side via an inner pipe joint 7 and an inner pipe 8. A first flow path 9 is configured. A tip passage 10a is formed in the axial direction on the side of the valve chamber 5 and communicates with a main passage 10b between the outer tube 1 and the inner tube 8. A second flow path 10 is configured.

A pair of first and second discharge ports 11 and 12 are formed in the side wall of the valve chamber portion 5 . A recess 13 is formed on the outer peripheral surface of the valve chamber 5 at the location where the discharge ports 11 and 12 are formed, and a recess 13 is formed between the outer pipe 1 and the mixing chamber 1.
4 are configured. A guide hole 15 is provided on the side wall of the valve chamber portion 5 on the opposite side, and a communication hole 1 is provided below the guide hole 15.
6 are formed, respectively, and communicate the tip flow path 10a of the second flow path 10 and the valve chamber 5.

An annular constricted portion 17 is formed in the upper part of the spool valve 6, and this formed position is in communication with the second discharge port 12 and the guide hole 15 at the lower limit position of the spool valve 6 shown in FIG. ing. Further, in the middle of the spool valve 6, a guide hole 18 is formed which communicates with the communication hole 16 at its upper limit position (FIG. 1) and passes through the inside and exits downward.

A valve seat 20 in which a guide hole 19 is formed is installed inside the joint pipe 2, and a seal is formed between the circumferential surface of the valve seat 20 and the inner surface of the joint pipe 2 by an annular check valve 21. . A spring 22 is disposed between the upper surface of the valve seat 20 and the spool valve 6, and always urges the spool valve 6 upward. Reference numeral 23 represents an ejection hole formed within the cutting blade 3.

When injecting grout, water W and the like are first pumped through the second channel 10 while rotating the injection pipe around the axis. Since the spool valve 6 is biased by the spring 22 and is at the upper limit position, the water W enters the guide hole 18 from the tip flow path 10a through the communication hole 16, passes through the guide hole 19, and enters the annular check valve 21. The liquid is ejected through the ejection hole 23 while expanding the tongue part of the liquid. The injection tube is installed at a predetermined location while continuing the spouting of water W and the pushing and rotation of the injection tube.

Next, as shown in FIG. 2, one liquid Pa of the two-component curable packing material P is fed under pressure to the first flow path 9,
The other liquid Pb is force-fed to the second channel 10. As a result, the spool valve 6 is pushed downward by the feeding pressure of the liquid Pa, overcoming the biasing force of the spring 22. Therefore, the first flow path 9 and the first discharge port 11
The liquid Pa is discharged from the first discharge port 11 into the mixing chamber 14 . On the other hand, by moving the spool valve 6 to the lower limit position, the communication hole 16 is closed by the spool valve 6, but the guide hole 15 is closed by the narrowed part 17.
communicate with. As a result, the liquid Pb is discharged from the guide hole portion 15 through the narrowing portion 17 and into the mixing chamber 14 via the second discharge port 12 . The liquids Pa and Pb discharged from the discharge ports 11 and 12, respectively, collide with the outer tube 1 that constitutes the mixing chamber wall 1a, where the flow direction is roughly changed.
It flows toward the middle position between the discharge ports 11 and 12 by turning 90 degrees. As a result, liquids Pa and Pb come into contact with each other in a countercurrent manner,
It is injected into the surrounding ground from the injection port 4 while being vigorously mixed. The injected packing material P reliably fills the gap between the ground and the circumferential surface of the injection pipe and solidifies.
Once this injection is complete, 30 minutes until completely solidified.
Pause the pumping body for ~300 seconds.

Thereafter, as shown in FIG.
Then, the other grout Gb is pumped into the second channel 10. The pumped grouts Ga and Gb merge countercurrently in the mixing chamber 14 while pushing down the spool valve 6 as in the case of the packing material described above, and are injected into the surrounding ground from the injection port 4 while vigorously contacting and mixing. .

This injection is performed while rotating the injection tube around the axis and moving it in the axial direction, if necessary.

When the two liquids are combined in a countercurrent manner in this manner, the two liquids can be inevitably mixed together. Therefore, it is particularly effective when it is necessary to mix reliably within a short time, such as when using an instant-setting chemical solution with a gel time of 30 seconds or less.

By the way, in the present invention, a valve chamber 5 is provided inside the outer tube 1, and a spool valve 6 is provided within the valve chamber 5a. Therefore, when forming the mixing chamber 14, it can be easily formed by simply grooving the recess 13 on the circumferential surface of the valve chamber 5, and the discharge ports 11 and 12 can be formed by using the surface of the valve chamber 5. Just drill the holes from the side. Conversely, if the outer pipe 1 and the valve chamber 5 are integrated, the discharge ports 11 and 12 and the mixing chamber 1
4, it is necessary to perform difficult processing and then close the processed side wall surface with a blind plug or the like.

Furthermore, if wear occurs on the outer tube 1 during boring and pouring, only the outer tube 1 needs to be replaced.
Furthermore, if damage occurs to the valve chamber 5, only that part needs to be replaced. Moreover, when acid grout is used in recent years, the entire device must be made of corrosion-resistant material such as stainless steel, but stainless steel is not only expensive but also susceptible to wear, so the outer tube 1 and flow path are By making the valve chamber part 5 separate from the valve chamber 5, a suitable material can be selected.

FIG. 4 shows an example in which the embodiment is different, and functionally the same parts are given the same reference numerals. In this example, the injection port 4' is formed slightly below the discharge port 12, and the flow direction of the liquid discharged from the discharge port 11 is changed to flow down along the guide chamber wall 1'a. The liquid discharged from the discharge port 12 is orthogonally merged, contacted and mixed, and then injected from the injection port 4'. 17' is spool valve 6
This is a through hole that penetrates through the.

FIGS. 5 to 10 show further examples of other tip devices. This tip device is connected to the swivel via a connecting pipe, and three flow paths are independently configured up to the tip device. 1 is an outer tube, and on its tip side (right side in Figure 5) is a joint tube 2,
and a cutting blade 3 are screwed together.
Further, a connecting tube 24 is connected to the proximal end side of the outer tube 1. 5 is a valve chamber provided inside the outer tube 1;
A spool valve 6' is installed inside the valve chamber 5a.
Reference numeral 25 denotes a flow path element installed in the connecting pipe 24 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 25.
Further, in the channel element 25, there is a joint 34 that constitutes the first A liquid path 32 that communicates with the second A liquid path 28, and a joint 38 that configures the first B liquid path 36 that communicates with the second B liquid path 30. are screwed together. The space between the joints 34 and 38 and the connecting pipe 24 forms a first C channel 40. Further, both sides of the channel element 25 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 1, and a second joint 46 is installed at the distal end of the joint tube 2. In addition, the valve chamber portion 5 has outlet ports 48 and 50 formed symmetrically with respect to the center.
A half circumference of the outer tube 1 forms a guide gap 52, and the guide gap 52 communicates with the outflow ports 48 and 50, and also communicates with the first inlet 54. A guide hole 56 is formed on the distal end side of the outlet 48 .

The spool valve 6' 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 6' 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 6', and a guide hole 68 that coincides with the non-moving guide hole 56 of the spool valve 6' is formed. . On the other hand, the valve chamber part 5
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 5
is formed.

Furthermore, the inside of the tip of the valve chamber portion 5 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 this continuous pipe 80 and the joint pipe 2 is the sixth C channel 8.
2, and although not shown, the second joint 46
The seventh C channel 84 passes between the circumferential surface of the cutting blade 3 and the cutting blade 3.
is connected to. The middle of the seventh C channel 84 is normally closed by a rubber annular check valve 86 having a tongue portion 86a. Furthermore, a sixth A flow path 88 is formed in the second joint 46, and the sixth A flow path 88 is blocked by a check valve 90 in the middle thereof. A guide 92 is screwed onto the tip of the second joint 46.
The inside thereof serves as a seventh A flow path 94. Reference numeral 96 denotes a spring, and the check valve 90 uses the guide 92 as a seat.
is biased to seal the sixth A flow path 88. Further, a discharge hole 98 is formed in the lower circumferential wall of the guide 92, and the liquid discharged from the discharge hole 98 and the liquid passing through the seventh C channel 84 are configured to intersect at right angles. 100 is a second injection port.

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
It passes through the liquid paths 72 and 76, passes through the inside of the connecting pipe 80, reaches the sixth flow path 88, exits to the seventh A flow path 94 while pressing down the check valve 90, and is discharged from the discharge hole 98 to the second inlet. It is discharged forward from the inlet 100.

Also, when C liquid is pumped, each of the C flow paths 40, 4
2, 70, 74, 78, and 84 in order, and while bending the tongue 86a of the annular check valve 86, the tongue 86 of the annular check valve 86 is bent.
a and the guide 92, and the second injection port 100
It is discharged from. In this case, if the A liquid is discharged from the discharge port 98 at the same time, the A liquid and the C liquid will join orthogonally for the first time here, and the combined liquid will be injected from the second injection port 100.

Further, when liquid B is pumped, each of the B flow paths 36,
Pass through 30 and 62. At this time, when liquid A is also pumped as described above, the urging force of the spring 58 is overcome and the transport pressure of both liquids A and B causes the spool valve 6'
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 6' 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 alone can be discharged from the second injection port 100, liquid C alone can be discharged from the second injection port 100 through the discharge port 98, and both liquids AC can be discharged from the second injection port 100. 98 outlet and discharged from the second inlet 100, and the AB liquids are passed through the outlet ports 48 and 50 and countercurrently merged in the guide gap 52, and then discharged from the first inlet 54. In addition, 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 only liquid A or only liquid B from the first injection port 54 through the outlet 48 or 50. .

As described above, in the present invention, a valve chamber separate from the outer tube is provided inside the outer tube, and a spool valve is disposed within the valve chamber, so that a flow path can be easily created between the valve chamber and the outer tube. It can be processed and formed, and the discharge port is also easy to process.
It is particularly excellent when using a countercurrent merging method.
Furthermore, since the outer tube and the valve chamber are separate bodies, they can be replaced and have the advantage of being useful in selecting materials.

[Brief explanation of the drawing]

Figures 1 to 3 are longitudinal cross-sectional views showing the device of the present invention in the order of construction and its operating state, Figure 4 is a vertical cross-sectional view of a device with a different aspect, and Figure 5 is a vertical cross-sectional view of a device of still another example. The top view, Figures 6 to 10 are - of Figure 5.
~-- is a sectional view taken along the line. 1...Outer pipe, 4...Inlet, 5...Valve chamber, 5
a... Valve chamber, 6, 6'... Spool valve.

Claims (1)

[Claims] 1. A valve chamber separate from the outer tube is detachably provided in the outer tube, a spool valve is movably provided in the valve chamber of the valve chamber, and an inlet of the outer tube faces into the valve chamber and the outside of the valve chamber. A chemical liquid injector characterized in that a chemical liquid flow path communicating with the valve chamber is formed by penetrating the inside and outside of the valve chamber.