JP2015059377A - Changeover device and changeover method of supply of fluid, and high pressure injection and agitation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a changeover device of supply of fluid capable of easily performing changeover of supply of fluid (for example, solidification material slurry and drilling water), and utilizing optional ground penetration high pressure injection and agitation means having two flow passages.SOLUTION: A changeover device 1 includes: a pipe conduit 2 having an opening 2a on the entrance side for inflow of fluid, an opening 2b on the outlet side for outflow of the fluid, and a fluid changeover opening 2c provided between the opening 2a on the entrance side and the opening 2b on the outlet side; and a support part 3 for supporting the pipe conduit 2 so as to be rotatable around the axis line thereof and branching part of the fluid circulating in the pipe conduit 2 to cause outflow, which has an open hole 3c for branching part of the fluid circulating in the pipe conduit 2 to cause outflow when the pipe conduit 2 is rotated to make a position of the open hole match with the fluid changeover opening 2c of the pipe conduit 2.

Description

  The present invention relates to a switching device and a switching method for supplying fluid (for example, solidifying material slurry and drilling water), and a high-pressure jet stirring device including the switching device.

As a ground improvement method for improving soft ground or the like with high strength, a high-pressure jet stirring method is known.
The high-pressure jet agitation method that is the subject of the present invention refers to the target by the excavation bit at the lower end of the ground injection pipe while jetting drilling water from the lower end of the ground injection pipe that is the ground penetration part of the high-pressure injection agitation device. The ground is drilled to the depth of the ground, and then the solid injection slurry is injected from the vicinity of the lower end of the ground injection pipe to the side, and the ground injection pipe is raised while rotating around its axis to obtain a columnar ground improvement body. This is a construction method.

In this construction method, various methods for switching the supply of the solidifying material slurry and the drilling water are known.
For example, in paragraph 0026 and FIG. 3 of Patent Document 1, when supplying the drilling water W, the ball 17B is not inserted, and the drilling water WO is passed through the flow path 18 passing through the valve seat 17A to the drilling water discharge hole. It is described that, when feeding and supplying the improving liquid M, the flow path 18 is sealed by introducing a ball 17B, and the improving liquid M is sent to the cement milk injection nozzle 16.

  Further, in claim 1, FIG. 2, FIG. 6 and FIG. 7 of Patent Document 2, an outer pipe 1 and an inner pipe 2 are formed, and an A channel is formed in a gap portion between the outer pipe 1 and the inner pipe 2. A ground improvement jet pipe having a double pipe structure in which the inner passage of the inner pipe 2 is a B flow path, and a projecting pipe 30 protruding in a direction perpendicular to the jet pipe axis is provided at the front portion of the jet pipe. In addition, an overhanging injection inner pipe 31 that can be projected and retracted outside the pipe in the overhanging pipe 30 and that has a first injection nozzle 32 at the tip is housed, and further, an outer pipe on the tip side from the overhanging tube mounting position. The portion is provided with a second injection nozzle 36, and the inner tube 2 is movable in the tube axis direction by an inner tube moving means provided at the head of the injection tube. The opening and closing control of the flow path to the injection nozzle 32 is performed, and the overhanging injection inner pipe is made with the supply liquid from this A flow path as the working liquid An ejection mode (FIG. 6) in which the supply liquid is ejected only from the second ejection nozzle 36 in a state in which the projecting operation of 1 is controlled and the overhanging inner pipe 31 is accommodated in the overhanging pipe 30, and the overhanging inner pipe It is possible to arbitrarily select the switching between the injection mode (FIG. 7) in which the supply liquid is injected from both the first injection nozzle 32 and the second injection nozzle 36 in a state in which 31 protrudes outward from the overhanging pipe. A characteristic ground improvement jet is described.

JP-A-2005-54492 Japanese Patent Laid-Open No. 7-102549

Conventionally, in the high-pressure jet agitation method, in order to switch the supply of the solidifying material slurry and the drilling water, as described above, the ball 17B (Patent Document 1) or a special jet pipe having a double-pipe structure (Patent Document 2) ) Was needed.
Among them, the method using the ball 17B (Patent Document 1) has a problem that the work is complicated because the ball 17B must be taken out and put in each time the ground improvement body is formed.
In addition, the method using a special injection pipe having a double pipe structure (Patent Document 2) has a complicated structure of the injection pipe, so the production cost of the injection pipe is high, and the existing injection pipe (for ground penetration) There is a problem that the high-pressure jet stirring means) cannot be used.

  It is an object of the present invention to easily switch the supply of fluid (for example, solidifying material slurry and drilling water), and to use any high-pressure jet agitating means for penetrating the ground having two flow paths. It is possible to provide a fluid supply switching device and switching method, and a high-pressure jet stirring device including the switching device.

  As a result of intensive studies to solve the above problems, the present inventor has found that an opening for fluid supply switching (hereinafter referred to as “fluid switching opening”) is provided between the opening on the inlet side and the opening on the outlet side. And a part of the fluid in the pipe line when the pipe line is rotated and aligned with the fluid switching opening of the pipe line (first member). According to the fluid supply switching device having a through hole that can be branched and allowed to flow out, and a support portion (second member) for supporting the pipe line, the fluid (for example, solidified material) The supply of slurry and drilling water can be easily switched, and any ground penetration high-pressure jet stirring means having two flow passages can be used without modification. The present invention has been completed.

That is, the present invention provides the following [1] to [6].
[1] A fluid supply switching device for use in a high-pressure jet agitation method, an inlet side opening for inflow of fluid, and an outlet side for outflow of fluid (eg, solidified material slurry) A fluid passage opening provided between the opening on the inlet side and the opening on the inlet side and the opening on the outlet side, and the pipe line rotatably supported about its axis. A support portion for branching out and flowing out a part of the fluid (for example, drilling water) flowing through the pipeline, the fluid switching opening of the pipeline by rotating the pipeline Including a support portion having a through-hole capable of branching out and flowing out a part of the fluid (for example, drilling water) flowing through the pipe line by aligning the position with the portion. Supply switching device.
[2] A first support part for supporting a part in which the support part has the through hole and includes one end of the pipe line, and the other end of the pipe line without the through hole. A tool for rotating the pipe line between the first support part and the second support part of the support part. For example, the switching device according to [1], further including a rotation operation unit into which a spanner) can be inserted.

[3] A method for controlling the flow rate of fluid using the switching device according to [1] or [2], wherein the rotation operation unit of the pipeline is rotated and the rotation angle is adjusted to adjust the rotation angle. The fluid switching opening and the through hole of the support portion are changed to change the size of the area, and the flow rate of the fluid branched and flowing from the pipe to the support portion is controlled. Flow rate control method.
[4] A high-pressure jet agitating device having the switching device according to [1] or [2] and a high-pressure jet agitating means for ground penetration, wherein the high-pressure jet agitating means for ground penetration is the above-mentioned of the switching device. A first flow path for circulating the fluid flowing out from the through hole of the support portion, a second flow path for circulating the fluid flowing out from the opening on the outlet side of the conduit of the switching device, A high-pressure jet agitating device having a fluid discharge port for discharging the fluid guided by the first flow path and a fluid discharge port for discharging or discharging the fluid guided by the second flow path.
[5] A fluid supply switching method using the high-pressure jet agitating device according to [4], wherein when the ground penetrating high-pressure jet agitating means penetrates the ground, Adjusting the position of the conduit of the switching device so that the through-hole and the fluid switching opening of the conduit of the switching device at least partially overlap each other, fluid is supplied to the first channel. Circulating the fluid and discharging the fluid from the fluid discharge port, and when the ground penetration high-pressure jet stirring means is pulled up, the fluid-switching of the through-hole of the support portion of the switching device and the conduit of the switching device Adjusting the position of the conduit of the switching device so as not to overlap the opening, causing the fluid to flow through the second flow path, and ejecting the fluid from the fluid ejection port. Method for switching the supply of fluid.
[6] A fluid supply method using the high-pressure jet agitating device according to [4] above, wherein the penetration of the support portion of the switching device when the ground-penetrating high-pressure jet agitating means penetrates the ground. Adjust the position of the conduit of the switching device so that the hole and the fluid switching opening of the conduit of the switching device overlap at least partially, and allow the fluid to flow through the first flow path. The step of discharging the fluid from the fluid discharge port, and the through hole of the support portion of the switching device and the fluid switching opening portion of the conduit of the switching device when the ground penetration high-pressure jet stirring means is pulled up And the position of the conduit of the switching device is adjusted so that the fluid flows through each of the first flow path and the second flow path, and the fluid discharge port and the fluid ejection Including a step of ejecting fluid from the mouth, Method for switching the supply of fluid.

According to the switching device of the present invention, the switching device is installed on the ground, and an operator performs an operation of slightly rotating a pipe line that is a constituent part of the switching device. The supply of slurry and drilling water can be easily switched.
Moreover, according to the switching device of the present invention, any ground penetration high-pressure jet stirring means (for example, existing ones) having two flow paths can be used as they are without modification.
Furthermore, according to the switching device of the present invention, for example, when the solidified material slurry supplied only from the opening on the outlet side of the conduit of the switching device of the present invention is clogged near the fluid ejection port, When the fluid is switched by the switching device of the invention and the solidified material slurry is guided to the fluid discharge port through the through hole of the support portion of the switching device and discharged, the fluid pressure of the solidified material slurry is greatly reduced. It is possible to perform a work for removing the clogging of the solidified material slurry in the vicinity of the fluid ejection port by lifting the ground penetration high-pressure jet agitating means until the fluid ejection port appears on the ground.

It is sectional drawing which shows the state which cut | disconnected the switching apparatus of this invention in the state which the opening part for fluid switching of the pipe line and the through-hole of the support part overlapped completely in the surface which passes along the axis line of a pipe line. From the state shown in FIG. 1, the switching device of the present invention in which the fluid passage opening of the pipeline and the through hole of the support portion do not overlap at all is obtained by rotating the pipeline 90 degrees. It is sectional drawing which shows the state cut | disconnected by the surface which passes. It is a figure for demonstrating the change of the magnitude | size of the area where the opening part for fluid switching of a pipe line and the through-hole of a support part overlap by rotating a pipe line in the switching apparatus of this invention. It is a figure which shows typically an example of the high pressure jet stirring apparatus containing the switching apparatus of this invention. It is a figure which shows typically the other example of the high pressure injection stirring apparatus containing the switching apparatus of this invention.

Hereinafter, an example of an embodiment of the switching device of the present invention will be described with reference to FIGS. 1 to 4 in the case where the two types of fluids to be switched are solidified slurry and drilled water. However, in the present invention, the fluid is one kind (for example, water), and the one kind of fluid is switched between the case where the fluid is circulated only in one direction not branched and the case where the fluid is circulated in two branched directions. It is also possible to take an embodiment in which the two kinds of embodiments and the two types of fluids to be switched are other than the combination of the solidifying material slurry and the drilling water (for example, the solidifying material slurry and the bentonite kneaded water).
In FIG. 1, a switching device 1 of the present invention is a device for switching between supply of solidifying material slurry and supply of drilling water in a high-pressure jet stirring method.
Here, the high-pressure jet stirring method is a high-pressure jet stirring means for ground penetration of a high-pressure jet stirring device (a rod for ground penetration and its accessories, hereinafter sometimes abbreviated as stirring means). While discharging the drilling water, drill the ground to the target depth by the excavation bit at the lower end of the stirring means, and then spray the solidified material slurry from the vicinity of the lower end of the stirring means, It is a construction method that creates a columnar ground improvement body by raising it while rotating it.

The switching device 1 of the present invention includes a conduit 2 for circulating a solidified material slurry or drilling water, which is a fluid, and supports the conduit 2 so as to be rotatable about its axis, and a fluid in the conduit 2 (normally , Drilling water) and a support part 3 for branching out and a stand (not shown) for mounting and fixing the support part 3.
The pipe 2 is composed of a cylindrical peripheral wall 2e as a whole having a circular inner periphery when cut perpendicularly to the axis thereof, and includes an inlet-side opening 2a for inflow of fluid, The outlet side opening 2b for the outflow of fluid, the fluid switching opening 2c provided between the inlet side opening and the outlet side opening, and a tool for rotating the pipe 2 (For example, a spanner) is inserted and the rotation operation part 2d for rotating the pipe line 2 is provided.

The support portion 3 includes a first support portion 3a for supporting a portion having the through hole 3c and including one end of the pipe line 2, and a portion having no through hole 3c and including the other end of the pipe line 2 And a second support portion 3b for supporting the.
The through-hole 3c of the support part 3 rotates the pipe line 2 and aligns the position with the fluid switching opening 2c of the pipe line 2, thereby allowing fluid (usually drilling water) to flow through the pipe line 2. A part can be branched and discharged. FIG. 1 shows a state in which the position of the fluid switching opening 2c is aligned with the through hole 3c. In this state, the space in the pipe line 2 and the space in the through hole 3c are in communication.
When the pipe line 2 is rotated, for example, 90 degrees, and the position of the fluid switching opening 2c is moved to the position of the dotted circle in FIG. 2, the through hole 3c of the support part 3 and the pipe line 2 Since the position with the fluid switching opening 2c does not match and the through hole 3c of the support 3 is blocked by the peripheral wall 2e of the pipe 2, the fluid in the pipe 2 is partially supported by the support 3 It cannot flow out through the through hole 3c. In this case, the fluid flows out only from the opening 2b on the outlet side.
As shown in FIG. 3, in the present invention, by adjusting the rotation angle of the pipe line 2, the size of the area where the fluid switching opening 2 c of the pipe line 2 and the through hole 3 c of the support part 3 overlap each other is set. By changing the flow rate, the flow rate of the fluid flowing from the pipe line 2 into the through hole 3c of the support portion 3 can be controlled. In FIG. 3, (a) corresponds to FIG. 1, and shows a state where the through hole 3c and the fluid switching opening 2c are completely overlapped (fully opened state), and (b) shows (a) ), The pipe 2 is rotated, and about 20 to 30% of the area of the through hole 3c is blocked by the peripheral wall 2e of the pipe 2, and (c) is from the state of (b). The pipe 2 is further rotated, and a state in which about 80 to 90% of the area of the through hole 3c is blocked by the peripheral wall 2e of the pipe 2 is shown. (D) shows the pipe 2 from the state (c). Is further rotated to show a state in which the through hole 3c is completely blocked by the peripheral wall 2e of the pipe line 2.

  In the present invention, the pipeline 2 and the support portion 3 are smoothly rotated so that the fluid does not leak from the gap between the pipeline 2 and the support portion 3. It is preferable to interpose an O-ring or a bearing (particularly a self-lubricating bearing) between them. In particular, by using an O-ring and a self-lubricating bearing in combination, the workability and safety of the switching device of the present invention can be improved.

  As shown in FIG. 4, the high-pressure jet agitating device including the switching device of the present invention is configured to rotate the switching device 1 of the present invention, the high-pressure jet agitating means 11 for penetrating the ground, and the stirring means 11 around its axis. The swivel 24, the first flow path 12 for guiding fluid (usually drilled water) from the through hole 3 c of the support portion 3 of the switching device 1 to the fluid discharge port 14, and the conduit 2 of the switching device 1 A second flow path 13 for guiding fluid (solidified material slurry or drilled water) from the outlet 2b on the outlet side to the fluid injection port 15, a solidified material slurry storage tank 16, a solidified material slurry supply path 18, A water storage tank 17 for storing drilling water, a water supply path 19, a switching ball valve 26 for switching between water supply and solidification slurry supply, and for supplying solidification slurry or water at high pressure. High pressure pump 20, fluid supply path 21, And a compressor and a compressed air supply passage for supplying compressed air for spraying wood slurry (not shown) or the like.

As the stirring means 11, a conventionally used normal stirring means can be used. As an example of the agitation means 11, a long rod penetrating into the ground, a drill bit (not shown) provided at the lower end of the rod, and a fluid discharge port (drilling hole) provided near the drill bit A water discharge port) and a stirring blade (not shown) having a fluid injection port (solidified material slurry injection port) formed in a horizontal direction from the rod slightly above the excavation bit.
The stirring means 11 is not limited to this example, and any one can be used as long as it has two flow paths, a fluid discharge port, and a fluid ejection port.

Next, an example of a method for switching the supply of the solidifying material slurry and the drilling water will be described with reference to FIGS.
When the stirring means 11 is allowed to penetrate the ground 25, the position of the through hole 3c of the support portion 3 of the switching device 1 is adjusted so as to match the fluid switching opening 2c of the pipe line 2 of the switching device 1 (FIG. 1 and FIG. 3A). On the other hand, the supply of the solidified material slurry from the solidified material slurry storage tank 16 is switched from the water storage tank 17 through the water supply path 19, the high-pressure pump 20 and the fluid supply path 21 while being stopped by the switching ball valve 26. Drilling water is supplied to the device 1. The hole water is divided into a first flow path 12 and a second flow path 13 from the switching device 1 and is pumped through the stirring means 11. The hole water 22 in the first flow path 12 is discharged downward from a fluid discharge port 14 provided in the vicinity of the excavation bit at the lower end of the stirring means 11 rotated by the swivel 24. Drilling water in the second flow path 13 is also ejected laterally from the fluid ejection port 15. For example, the amount of drilling water ejected from the fluid ejection port 15 is such that about 30 to 95% of the area of the through hole 3c of the support portion 3 of the switching device 1 is blocked by the peripheral wall 2e of the pipe line 2. Thus, it can be controlled by adjusting the rotation angle of the rotation operation unit 2d. That is, by adjusting the rotation angle of the rotation operation unit 2d, the ratio of the amount of drilling water 22 discharged downward from the fluid discharge port 14 and the amount of drilling water jetted from the fluid injection port 15 is set as follows. Can be adjusted.

  When the lower end of the stirring means 11 reaches the target depth, the supply of drilling water from the water storage tank 17 is stopped. Next, the position of the through hole 3c of the support portion 3 of the switching device 1 is not aligned with the position that matches the fluid switching opening 2c of the conduit 2 of the switching device 1 (in other words, the flow passage in the conduit 2). And the through-hole 3c of the support portion 3 are adjusted to a position where they do not communicate with each other (see FIG. 2 and FIG. 3D). Then, by switching the switching ball valve 26 in a state where the supply of drilling water from the water storage tank 17 is stopped, the flow from the water storage tank 17 to the high-pressure pump 20 is stopped, and the solidified material slurry storage tank The flow from 16 to the high-pressure pump 20 is released, and the solidifying material slurry is supplied from the solidifying material slurry reservoir 16 to the switching device 1 via the solidifying material slurry supply path 18, the high pressure pump 20 and the fluid supply path 21. The solidifying material slurry 23 passes through the second flow path 13 from the switching device 1 and is pumped through the stirring means 11 to cut the ground 25 and serve for the purpose of creating a ground improvement body. In addition, the solidified material slurry 23 fed by pressure may be jetted at a high pressure from the fluid jet port 15 to the side (horizontal direction) together with compressed air in a compressed air supply path (not shown). Since the solidifying material slurry changes the direction of injection as the stirring means 11 rotates, a substantially cylindrical ground improvement body can be formed.

  Further, when the solidifying material slurry 23 flowing in the second flow path 13 is clogged at the fluid injection port 15, the position of the through hole 3 c of the support portion 3 of the switching device 1 is changed to the tube of the switching device 1. By matching with the fluid switching opening 2c of the path 2, the solidified material slurry branches and flows into the first flow path 12, and the fluid pressure of the solidified material slurry in a high pressure state is reduced to a safe atmospheric pressure. Can be made. By this operation, an abnormal increase in pressure due to clogging of the solidified material slurry at the fluid ejection port 15 can be eliminated. At this time, the position of the through hole 3c of the support portion 3 of the switching device 1 and the position of the fluid switching opening 2c of the pipe line 2 of the switching device 1 are not completely matched but partially matched. Even if the rotation angle of the pipe line 2 is adjusted so that it is in a state where, for example, only about half is communicated and the other half is closed, the purpose of eliminating an abnormal pressure rise can be achieved. it can.

Next, an example of a method for supplying the solidified slurry using the switching device 1 of the present invention will be described with reference to FIG. In this example, a long stirring blade (having a fluid ejection port 40 at the tip) and a short stirring blade (having a fluid discharge port 39 at the tip) are arranged in two stages at the bottom of the stirring means. It is provided and the solidified material slurry is sprayed horizontally to create a ground improvement body.
In FIG. 5, reference numeral 30 denotes a stirring means, reference numeral 31 denotes a solidified material slurry storage tank, reference numeral 32 denotes a solidified material slurry supply path, reference numeral 33 denotes a high pressure pump, reference numeral 34 denotes a switching device of the present invention, and reference numeral 35 denotes a first flow. Reference numeral 36 denotes a second flow path, 37 denotes a swivel, 38 denotes the ground, 39 denotes a fluid discharge port, and 40 denotes a fluid ejection port. Here, the fluid discharge port and the fluid ejection port are named for convenience in order to distinguish between the two fluid discharge openings, and do not mean a difference in fluid pressure.
In addition, in FIG. 5, illustration of each part related to the supply of drilling water is omitted.

When the stirring means 30 penetrates into the ground 38, the supply of the solidified material slurry from the solidified material slurry storage tank 31 is stopped, and the drilling water is circulated through a drilling water supply channel (not shown). It discharges from a water discharge port (not shown).
When the lower end of the stirring means 30 reaches the target depth, the through hole of the support portion of the switching device 34 and the fluid switching opening of the pipe line of the switching device 34 are positioned so as to partially overlap each other. Then, after adjusting the position of the pipe line of the switching device 34, the solidifying material slurry is supplied from the solidifying material slurry storage tank 31 to the switching device 34 via the solidifying material slurry supply path 32 and the like.
Part of the solidified slurry that has flowed into the switching device 34 flows out into the first flow path 35, and the remaining portion flows out into the second flow path 36. At this time, by adjusting the size of the partially overlapping area between the through hole of the support portion of the switching device 34 and the fluid switching opening of the conduit of the switching device 34, The ratio between the amount of liquid flowing out and the amount of liquid flowing out into the second flow path 36 can be adjusted.

  The solidified slurry that circulates in the first flow path 35 and flows down in the stirring means 30 is ejected in a horizontal direction from a fluid discharge port 39 at the tip of a short stirring blade provided in the lower part of the stirring means 30. Is done. On the other hand, the solidified slurry that has flowed through the second flow path 36 and has flowed down through the stirring means 30 is horizontally discharged from the fluid injection port 40 at the tip of the long stirring blade provided at the lower part of the stirring means 30. Jetted in the direction. In this way, by injecting the solidified material slurry into the ground from both the fluid discharge port 39 and the fluid injection port 40, compared to the case of injecting the solidification material slurry from the fluid injection port 40 alone, The supply amount of the solidifying material slurry in the rotation trajectory increases, and a ground improvement body with a more uniform content of the solidifying material slurry can be created.

DESCRIPTION OF SYMBOLS 1 Switching apparatus of this invention 2 Pipe line 2a Inlet side opening 2b Outlet side opening 2c Fluid switching opening 2d Rotation operation part 2e Peripheral wall 3 Support part 3a First support part 3b Second support part 3c Through Hole 11 Stirring means 12 First flow path 13 Second flow path 14 Fluid discharge port 15 Fluid injection port 16 Solidified material slurry storage tank 17 Water storage tank 18 Solidified material slurry supply path 19 Water supply path 20 High pressure pump 21 Fluid supply Channel 22 Drilling water 23 Fluid (solidified material slurry or water)
24 Swivel 25 Ground 26 Switching Ball Valve 30 Stirring Means 31 Solidified Material Slurry Reservoir 32 Solidified Material Slurry Supply Channel 33 High Pressure Pump 34 Switching Device 35 of the Present Invention First Flow Channel 36 Second Flow Channel 37 Swivel 38 Ground 39 Fluid Discharge port 40 Fluid injection port

Claims (6)

A fluid supply switching device for use in a high-pressure jet stirring method,
An opening on the inlet side for inflow of fluid, an opening on the outlet side for outflow of fluid, and a fluid switching opening provided between the opening on the inlet side and the opening on the outlet side A conduit having a section;
A supporting portion for supporting the pipe line rotatably about its axis, and for branching out a part of the fluid flowing through the pipe line so that the pipe is rotated to rotate the pipe. Including a support portion having a through hole through which a part of the fluid flowing in the pipe can be branched and discharged by being aligned with the fluid switching opening of the passage. Supply switching device. A first support portion for supporting the portion having the through-hole and including one end of the conduit; and a portion not having the through-hole and including the other end of the conduit. A second support portion for supporting,
The said pipe line has a rotation operation part which can insert the tool for rotating the said pipe line between the 1st support part and the 2nd support part of the said support part. Switching device.   A fluid flow rate control method using the switching device according to claim 1 or 2, wherein a rotation operation part of the pipe line is rotated, and a fluid switching opening part of the pipe line is adjusted by adjusting the rotation angle. And controlling the flow rate of the fluid that flows from the conduit into the support portion by changing the size of the area in which the through hole of the support portion overlaps. A high-pressure jet agitating device comprising the switching device according to claim 1 or 2 and a high-pressure jet agitating means for ground penetration,
The high-pressure jet agitating means for penetration into the ground from a first flow path for circulating the fluid flowing out from the through hole of the support portion of the switching device, and an opening on the outlet side of the conduit of the switching device A second flow path for circulating the flowed fluid, a fluid discharge port for discharging or ejecting the fluid guided by the first flow path, and a fluid guided by the second flow path. A high-pressure jet agitator having a fluid jet for jetting or discharging. A fluid supply switching method using the high-pressure jet agitator according to claim 4,
When allowing the ground penetration high-pressure jet stirring means to penetrate the ground, the through hole of the support portion of the switching device and the fluid switching opening of the conduit of the switching device at least partially overlap. Adjusting the position of the conduit of the switching device, causing the fluid to flow through the first flow path, and discharging the fluid from the fluid discharge port;
When pulling up the high-pressure jet agitating means for penetrating the ground, the conduit of the switching device is arranged so that the through hole of the support portion of the switching device and the fluid switching opening of the conduit of the switching device do not overlap. The fluid supply switching method includes the step of adjusting the position of the fluid, causing the fluid to flow through the second flow path, and ejecting the fluid from the fluid ejection port. A fluid supply method using the high-pressure jet agitator according to claim 4,
When allowing the ground penetration high-pressure jet stirring means to penetrate the ground, the through hole of the support portion of the switching device and the fluid switching opening of the conduit of the switching device at least partially overlap. Adjusting the position of the conduit of the switching device, causing the fluid to flow through the first flow path, and discharging the fluid from the fluid discharge port;
When pulling up the high-pressure jet agitating means for penetrating the ground, the through hole of the support portion of the switching device and the fluid switching opening of the conduit of the switching device partially overlap each other. Adjusting the position of the pipeline, allowing fluid to flow through each of the first flow path and the second flow path, and ejecting fluid from the fluid discharge port and the fluid ejection port, Method for switching the supply of fluid.

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