JP2001200527A - Monitor and method for switching channel therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for switching a channel of a monitor, which switches a branch channel by mechanically opening/closing a valve channel and therefore is high in reliability of operation, and to provide a monitor apparatus. SOLUTION: The monitor 1 for boring has a high-pressure water injection hole for boring, formed at the front end of an external pipe 3 to be driven for rotation, and functions to bore the natural ground M toward the underground and to inject a consolidating material, to thereby improve the soil. In the method for switching the channel of the monitor, which switches the fluid channel of the monitor to boring of the natural ground or to injecting of the consolidating material into the natural ground, a boring member 10 at the front end of the external pipe is pressed on the natural ground, and a pin 12 arranged on the external portion of a narrow-diameter shaft 11 formed at an upper portion of the boring member is fitted into a specific groove location of a cylindrical ring 20, to thereby open one channel 14. On the other hand, the pin 12 at the specific groove location is fitted into another specific groove location by repeatedly pulling up the boring member to be pressed on the natural ground again, to thereby close the one channel and opens the other channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member (monitor) which is disposed at the deepest part and performs an operation such as excavation or injection of a solidified material when excavating the ground and injecting a consolidated material when the ground is improved. In particular, a drilling fluid and a consolidating material (fluid) are supplied to a monitor through the same flow path, and a flow path communicating with a drilling fluid injection hole for injecting the drilling fluid in the monitor. The present invention relates to a method and an apparatus for switching between a flow path communicating with a bonding material jetting means for jetting a bonding material.

[0002]

2. Description of the Related Art Conventionally, in a grouting method or the like, a multi-tube, for example, a double tube or a triple tube, provided with a flow path according to the type of fluid supplied to a monitor is used. On the other hand, in view of the complicated structure of the connecting means when using multiple pipes and problems such as transmission of rotational force, a single flow path communicates from the ground to the monitor, and the fluid flows within the monitor. A method of selectively communicating with a predetermined flow path according to the type (or application) is also employed. As a valve mechanism used in the case of such a method of selectively communicating with a predetermined flow path in the monitor, a method of dropping a ball acting as a valve body from the ground side, a property of a fluid to be supplied (for example, Pressure) to determine the position of the valve opening, or a method of operating the solenoid valve by detecting the supply pressure. However, in the mechanical method of dropping a ball, there is a possibility that the flow path is not completely closed by the ball which is a valve body. In the method of determining the position of the valve opening by the supply pressure or the like or operating the solenoid valve (electrical control method), the malfunction of an electric opening / closing mechanism such as a solenoid valve or the malfunction of an electric system causes the solenoid valve to malfunction. Due to erroneous operation, complete reliability of operation has not been obtained.

[0003]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned various problems of the prior art.
An object of the present invention is to provide a method and an apparatus for switching a flow path of a monitor which can mechanically switch the flow path within a monitor for excavation and which has extremely high operation accuracy or reliability.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a boring monitor provided with a high-pressure water injection hole for drilling at the end of an outer tube, also called a rotatably driven rod, to cut ground toward the underground. The present invention relates to a monitor flow path switching method for switching a fluid path of a monitor for improving a ground by injecting an injectable material into the vicinity of a drilled ground and improving the ground. In the method of switching the flow path of the monitor according to the present invention, a fluid for drilling (e.g., a drilling fluid (e.g., cement milk, other ground improvement material) is disposed at the tip of the outer pipe. , High-pressure water) in a monitor flow path switching method for switching a flow path formed inside a boring monitor provided with a drilling member in which a drilling hole is formed. When drilling a boring hole by injecting a fluid, a pin provided on a shaft formed at the top of a drilling member at the tip is formed on an inner peripheral surface of a ring arranged so as to face the shaft. One of the flow paths communicating with a drilling fluid ejection hole formed in the drilling member, wherein the drilling member is fixed at a drilling position at a predetermined position in the guide groove formed. Is opened, and the consolidated material jet formed on the side surface of the outer tube The other flow path communicating with the means is closed by the shaft part, and when the injection of the drilling fluid is terminated and the consolidated material is injected from the consolidated material injection means, the drilling member is pressed against the ground or Pull up, slide the pin of the shaft portion in the guide groove of the ring, and guide it to the lowest point in the groove, thereby positioning the drilling member at the lowest position with respect to the outer pipe. At least, the one flow path communicating with the drilling fluid injection hole formed in the drilling member is closed by the shaft portion, and the other flow path communicating with the consolidated material injection means is opened. It is characterized by:

[0005] The present invention also provides a boring monitor provided with a high-pressure water injection hole for drilling at the tip of an outer tube, also called a rotatably driven rod, to drill the ground toward the basement,
The present invention relates to a monitor flow path switching device for switching a fluid path of a monitor for improving a ground by injecting an injection material around a drilled ground to switch between drilling or ground injection. A flow path switching device for a monitor according to the present invention is provided for boring provided with a drilling member provided with a drilling fluid injection hole, which is disposed at a distal end portion of an outer tube having a consolidated material injection means formed on a side surface. A flow passage switching device for switching a flow passage formed inside the monitor, wherein one flow passage communicating with the drilling fluid ejection hole and the other flow passage communicating with the solidifying material ejection means. A passage, a shaft formed on the upper part of the drilling member, a pin provided on the shaft, a ring disposed to face the shaft, and a guide formed on an inner peripheral surface of the ring. Grooves and
Means for urging the ring upward, the guide groove is provided with a predetermined location and a lowermost location, and if the pin is located at the predetermined location in the guide groove,
The drilling member is fixed at a drilling position, the one flow path is opened, and the other flow path is closed by the shaft portion,
When the pin is located at the lowermost position in the guide groove, the one flow path is closed by the shaft portion, and the other flow path is opened.

In practicing the present invention, it is preferable that the guide groove is formed of a plurality of continuous peaks and valleys, and one of the valleys is formed below the other valleys in the vertical direction.

[0007] The flow channel switching device for a monitor of the present invention has the best effects when it is assembled into a known so-called "grout method" or when it is incorporated.

According to the present invention having the above-described structure,
When the drilling member is pressed against the ground by raising and lowering the outer tube, the pin slides in the guide groove and moves from the predetermined position (drilling position) to the lowermost position (solid). (The position where the binder injection step is performed). Then, as the pin slides in such a guide groove, the drilling member and the shaft thereof move vertically relative to the outer tube. Then, the flow path (the other) communicating with the consolidated material injection means is closed, but the (the one) flow path communicating with the drilling fluid injection hole is opened (drilled state).
Then, the (one) flow path communicating with the drilling fluid injection hole is closed, but the (the other) flow path communicating with the consolidated material injection means is switched to an open state (consolidated material injection state). . In other words, according to the present invention, since the flow path can be switched only by moving the outer pipe up and down, the solidification material is injected and injected into the ground to be improved from the drilling step of excavating the borehole. The flow channel changing operation accompanying the change of the process to the binder injection process is reliably and easily performed.

Further, according to the present invention, a flow path of high-pressure water (fluid for drilling) required in a drilling step (drilling a boring hole) and a flow path of a solidified material in the ground to be improved. injection·
The bonding material or air flow path required in the bonding material injection process is used as a common single flow path up to the monitor.
Since the predetermined flow path is selectively communicated within the monitor, the flow path configuration in the pipe and the monitor used in the ground improvement method is simple.

Further, according to the present invention, by changing the relative vertical position of the outer tube and the drilling member in the outer tube,
It is configured to switch the flow path, and adopts a relatively simple and highly reliable mechanical configuration. In addition, since the cross-sectional shapes of the drilling fluid supply flow path and the solidification material injection flow path can be simplified, the fluid flow resistance is low, and the drilling efficiency and the solidification material injection by the drilling fluid are reduced. Efficient.

Further, a guide groove provided on the inner periphery of the ring for determining the relative height position of the drilling member with respect to the outer tube is provided at a "mountain" which is a relatively upper region and at a relatively lower region. The valley is formed as a region, and when the pin is fitted into the top of the peak and the valley, and the lowermost point, the pin is less likely to slide as compared with other parts. ing. Therefore, in the operation of moving the outer tube up and down to change the flow path, a moderation due to resistance is provided, and erroneous operation is prevented. For the same reason, various damping mechanisms are provided,
It is preferable to prevent a situation of “change of flow path due to erroneous operation”.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of a monitor according to an embodiment of the present invention;
FIG. 1 shows a monitor 1 and a flow path switching device 1A formed therein. In this figure, a path state in which high-pressure drilling water supplied from above is supplied to a drilling member 10 is shown. Is shown.

In FIG. 1, a working fluid is supplied from a ground-side device (not shown), and a drilling member 10 is provided at the distal end of an outer pipe 3 that is driven to rotate for ground drilling. Elastic coil spring 22 (means for urging the ring upward)
, The ring 20, and the pressing rod 8 are provided to constitute the flow path switching device 1A.

The drilling member 10 includes a bit holding portion 15 at the tip.
2, a plurality of drill bits 16 are held, and as shown in FIG. 2, the central portion of the drilling member 10 is configured to have a regular hexagonal cross-sectional shape, and the inner cavity portion (regular hexagonal cross-section) of the outer tube 3. ) Is loosely slidably fitted in the vertical direction. With this configuration,
The drilling member 10 receives the rotation torque of the outer pipe 3 and excavates and drills the ground M while the drilling bit 16 rotates.

A shoulder 10a is formed at the center upper portion of the drilling member 10, and a shaft portion 11 having a relatively small diameter is formed at the upper portion of the shoulder 10a. A valve hole 13 communicating with the supply passage 2i is provided at an upper portion of the shaft portion 11, and a drilling pressure water passage 14 is provided downward from the valve hole 13 (and along the axis of the shaft 11). The “one flow path” communicates with an injection hole (a drilling fluid injection hole) not specified from the holding unit 15.
Is composed.

A central portion of the shaft portion 11 is vertically slidable by inner holes 4a and 5a of a pair of upper and lower annular ring plates 4 and 5 provided on the outer tube 3 so as to form a pair. Is held in.

As shown in FIGS. 7 to 9, a pin 12 is provided outside the shaft 11 in the horizontal direction. The pin 12 is formed in a trapezoidal shape when viewed from the side, and the upper inclined portion 12u and the lower inclined portion 12d are configured to fit into and slide with a ring groove 20b described later.

Returning to FIG. 1, a ring 20 is mounted between the ring upper plate 4 and the ring lower plate 5. Ring 20
As shown in FIG. 4 and FIG.
A guide groove 20b is formed in the shape of a chevron curve over the inner circumference at 0a. A pin 12 provided outside the shaft portion 11 is fitted into the guide groove 20b, and the pin 12 slides in the guide groove 20b so as to interlock with the vertical movement of the drilling member 10,
The vertical movement stop position of the pin 12 is determined. The vertical position of the pin 12 determines the open / close position of the valve hole 13 that guides high-pressure water, which is a drilling fluid, to the drilling pressure channel 14.

As shown in a development view in FIG. 6, the guide groove 20b has three consecutive peaks At, B1t and B having the same height.
2t, and only A is formed by three valleys A, B1, and B2 that are deeper (or located below) than others. The ridges At, B1t, B2t and the valleys B1, B2, which are the upper positions of the valleys, are provided with fitting portions 20c that fit into the upper and lower corners of the pin 12.

FIG. 10 shows, together with FIGS. 4 to 6, how the pin 12 for determining the position of the valve hole 13 moves. When the pin 12 is at the position of the valley A (the lowest position) which is the lower position of the valley in FIG. 6, the valve hole 13 closes the flow to the drilling member 10 and injects or injects the consolidated material into the nozzle N (Consolidating material injection means) (see FIG. 3:
"A state in which the one flow path communicating with the drilling fluid injection hole is closed while the other flow path communicating with the consolidated material injection means is opened (a consolidated material injection state)").

Then, the valley A at the lower position → the valley B at the upper position
1 and a pin 12 rising from valley A with a peak At
However, once from the position 12a in FIG.
0c (predetermined location).

Next, the pin 12 pushed down from the fitting portion 20c of the peak At reaches the valley B1 along the groove 20b and fits into the fitting portion 20c. The valve hole 13 closes the flow to the nozzle N and opens the flow to the drilling member 10 in accordance with the movement of the pin 12 (see FIG. 1: "the other side which communicates with the consolidated material injection means"). Closes the flow path of
A state in which the one flow path communicating with the drilling fluid injection hole is open (drilling state)).

FIG. 11 shows the relationship between the position of the pin 12 and the opening and closing of the valve 13. For example, in the case where the position of the pin 12 is the valley A (the lowest position: corresponding to the consolidated material injection step),
The solidification material (and / or air) flow passage 2o leading to the nozzle N is open and the drilling water going to the drilling pressure passage 14 is closed,
As soon as the pin position moves from the valley A to the valley B1 (predetermined location: corresponding to a drilling step) from this state, the opening and closing direction of the valve 13 is immediately reversed.

However, in order to switch the opening and closing of the valve 13 with the pin 12 at the position B1 in the guide groove 20b, it is necessary to pass the pin 12 through the valley B2 once. That is, the high-pressure drilling water (high-pressure water) is stopped and the consolidated material (and / or
In order to switch to the air distribution, it must be done with some care and a structure that prevents the pin position from being changed immediately to the air passage even if the pin position moves due to a sudden change in drilling resistance. Has become.

In the illustrated embodiment, if the upper and lower portions of the pin 12 are one stroke, two strokes are taken from the opening to closing of the drilling water. However, the number of strokes can be arbitrarily changed by the shape of the groove as required. Can be.

Referring again to FIG. 1 or FIG. 3, a coil spring 22 made of an elastic material is interposed between the shoulder 10a and the ring lower plate 5, and when compressed, drilling water is drilled. Member 10
In the extended state, the flow of the drilling water to the drilling member 10 is closed, and the drilling water is allowed to flow to the passage 2o.

The pressing rod 8 is mounted on the upper device while being fixed relative to the outer tube 3, and is configured to move up and down in the same manner as the up and down movement of the outer tube 3. FIG. 1 shows a state in which the lower end of the pressing rod 8 is formed in a concave shape and the coil spring 22 is compressed.
In this configuration, the sealing material flow passage 2o is closed by closely fitting with the top of the shaft portion 11.

In FIG. 3 where the coil spring 22 is extended, a gap is formed between the pressing rod 8 and the top of the shaft portion 11 so that the fluid supply passage 2i and the solidifying material (or air) passage 2o are formed. Are configured to pass through directly.

The channel switching device 1 of the monitor 1 having the above configuration
A method of switching a flow path using A will be described with reference to the drawings.

1. Drilling Step As shown in FIG. 3, the coil spring 22 is in the extended state, the pin 12 is in the valley A of the guide groove 20a, the supply passage 2i and the consolidated material passage 2o are opened, 2i and valve hole 1
3 is in a closed state (“the one flow path communicating with the drilling fluid injection hole is closed, but the other flow path communicating with the consolidated material injection means is open (the consolidated material injection state). ) ") Let's start with the explanation.

First, the drilling member 10 of the monitor 1 is pressed against the ground M together with the outer pipe 3 by an operation from the ground (see FIG. 1). As a result, the shoulder 10a compresses the coil spring 22, and the shaft 11 moves upward. As the shaft 11 moves upward, the pin 12 causes the groove 20b of the ring 20 to move in FIG.
And rises while sliding from the valley A.

The rising of the pin 12 causes the ring 20 to rotate along the groove 20b to reach the peak At, where the pin 12 is fitted into the fitting portion 20c and stopped. At this time, the flow path switching device 1A is, as shown in FIG.
2 is compressed.

This stop is regarded as one moderation.
Pull up. As shown in FIG. 10, the pin 12 extends vertically from the insertion portion 20c of the peak At to the position 12b, and then slides in the direction 12c along the inclined groove of the pin 20b, as shown in FIG. . The movement of the pin 12 in the left-right direction in FIG. 10 actually operates as the rotation of the ring 20, and the position of the pin 12 in the rotation direction does not move.

Then, the pin 12 reaches the valley B1 and fits into the fitting portion 20c. The valve hole 13 is provided in the supply passage 2i.
From the nozzle to the nozzle N and open the flow passage to the drilling member 10 (see FIG. 1: "The other flow path communicating with the consolidated material injection means is closed, but the drilling fluid injection hole is closed. Is open (drilled state) ").

In this manner, as shown in FIG.
Stops in the valley B1 at the upper position, the valve hole 13 communicates with the supply path 2i, and the drilling member 10 drills the ground M by the drilling bit 16 and the high-pressure water. The confirmation of the drilling process in the above-ground part can detect whether the drilling water is supplied or the consolidated material injection process by the supply fluid pressure.

2. Channel switching process. Injecting consolidated material (and / or air) from the drilling process
A flow path switching procedure for switching to the injection step will be described. Until now, the pin 12 has been fixed to the valley B1, but this pin 12 is moved to the right valley A in FIG. 6 to switch the flow path. For this purpose, the outer tube 3 is first pushed down from the state of FIG. 1 to raise the position of the pin 12 to the upper part of the ring 20 and to be fixed to the mountain B1t. At this point, a push-down resistance is generated, giving a sense of moderation.

Next, the outer tube 3 is pulled up and the pin 12 is pulled down by the spring 22, and is fixed to the fitting portion 20c of the valley B2. Again, resistance and moderation occur. Next, the outer tube 3
Is pressed down to fix the pin 12 to the mountain B2t. Then, the outer tube 3 is pulled up to fix the pin 12 to the valley A (the state of FIG. 3: “the one of the flow paths communicating with the drilling fluid injection hole is closed, but the communication is performed with the consolidated material injection means. The other flow path is open (solidified material injection state) ").

In this way, the pin 12 of the valley B1 in the drilling step is moved up and down by two strokes (B1 → B1t → B2 → B2t → A) to inject the consolidated material (or air). Then, the flow path is switched.

The flow path switching procedure for switching from the consolidated material (or air) to the drilling step is the same as the operation of (valley A → valley B1) described in the drilling step, and vertical movement is performed by one stroke. The position of the pin 12 may be changed.

[0040]

The effects of the present invention are listed below. (1) Since the flow path can be selected only by the vertical movement of the outer pipe (rod), the flow path changing operation accompanying the process change is reliable and easy. (2) The common high-pressure water flow path required in the drilling step and the flow path of the bonding material (and / or air) required in the bonding material injection step are shared by a single common flow path up to the monitor. Since the flow path is branched by the monitor, the flow path configuration is simple and the cost is low. (3) Since the flow path is changed by changing the vertical relative height between the outer tube and the drilling member in the outer tube, the structure is simple. Also, since the cross-sectional shape of the flow path when the drilling fluid supply path and the solidification material injection flow path are opened is simplified, the fluid flow resistance is small, and the drilling efficiency by the drilling fluid (high-pressure water) is improved. Injection efficiency of the consolidation material is good. (4) The guide groove provided on the inner circumference of the ring for determining the relative height position (relative vertical position) of the drilling member with respect to the outer tube has a valley, and furthermore, the top and the bottom of the valley. The pin fits into the outer tube, so the vertical movement of the outer tube for changing the flow path is moderate due to the moderation due to resistance,
Easy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a channel switching device of a monitor according to an embodiment of the present invention, showing a state in which a supply fluid is being supplied to a drilling member.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view of a monitor channel switching device according to an embodiment of the present invention, showing a state in which a supply fluid is supplied to a consolidated material (air) channel.

FIG. 4 is a perspective view showing a ring constituting the valve section.

FIG. 5 is a top view of FIG. 4;

FIG. 6 is an unfolded view showing the guide grooves of FIGS. 4 and 5;

FIG. 7 is a sectional view taken along the line BB of FIG. 1;

8 is a view as viewed in the direction of the arrow X in FIG. 7;

FIG. 9 is an enlarged view of a pin.

FIG. 10 is a partially enlarged view illustrating the operation of a guide groove.

FIG. 11 is a display diagram showing the relationship between the pin position and the opening and closing of the valve during valve operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Monitor 1A ... Flow path switching device 2i ... Supply path 2o ... Flow path 3 ... Outer tube 4 ... Ring upper plate 5 ... Ring lower plate 8 ... Pressing rod 10 ...・ Drilling member 10a ・ Shoulder part 11 ・ ・ Shaft part 12 ・ ・ Pin 13 ・ ・ Valve hole 14 ・ ・ Drilling pressure water channel 15 ・ ・ Bit holding part 16 ・ ・ Drilled bit 20 ・ ・ Ring 20a ・ ・ Inner hole 20b ... guide groove 20c ... fitting part

Claims (3)

[Claims] 1. A boring monitor provided with a drilling member provided with a drilling fluid injection hole formed at a distal end of an outer tube having a bonding material injection means formed on a side surface. In the method of switching the flow path of the monitor, the drilling fluid is injected from the drilling fluid injection hole to drill a boring hole. A pin provided in the portion is located at a predetermined position in a guide groove formed on an inner peripheral surface of a ring arranged so as to face the shaft portion, and fixes the drilling member at a drilling position, Accordingly, one flow path communicating with the drilling fluid injection hole formed in the drilling member is opened, and the other flow path communicating with the consolidated material injection means formed on the side surface of the outer tube. The flow path is closed by the shaft portion, and the injection of the drilling fluid is terminated to consolidate the material injection means. When injecting the consolidation material, the drilling member is pressed or pulled up to the ground, and the pin of the shaft is slid in the guide groove of the ring to guide the pin to the lowest point in the groove, Accordingly, the drilling member is located at the lowest position with respect to the outer tube, and the one flow path communicating with the drilling fluid ejection hole formed in the drilling member is closed by the shaft portion, A method of switching the flow path of a monitor, characterized by opening the other flow path communicating with the consolidated material injection means. 2. A boring monitor provided with a drilling member having a drilling fluid injection hole formed at a tip end of an outer tube having a bonding material injection means formed on a side surface. A flow path switching device of a monitor for switching the flow path provided, wherein one of the flow paths communicating with the drilling fluid injection hole, the other flow path communicating with the consolidated material injection means, and A shaft portion formed on the upper portion of the member, a pin provided on the shaft portion, a ring arranged to face the shaft portion,
A guide groove formed on the inner peripheral surface of the ring, and means for urging the ring upward are provided, and the guide groove is provided with a predetermined portion and a lowermost portion, and the pin is When the drilling member is located at the predetermined position in the guide groove, the drilling member is fixed at the drilling position, the one flow path is opened, the other flow path is closed by the shaft, and the pin is guided. A flow path switching device for a monitor, wherein the one flow path is closed by the shaft portion and the other flow path is opened if the flow path is located at the lowermost position in the groove. . 3. The flow path switching of a monitor according to claim 2, wherein the guide groove is formed by a plurality of continuous peaks and valleys, and one of the valleys is formed so as to be vertically lower than the other valleys. apparatus.