JPH0849495A - Drilling direction control mehtod of small bore diameter pipe propulsive machine and its device - Google Patents

Abstract

PURPOSE:To easily carry out drilling direction control of a small bore diameter pipe propulsive machine in simple structure. CONSTITUTION:An eccentric flange 12 is installed on a guide body 10 free to rotate. A shaft 13 having a cutter head 14 is axially supported on the eccentric flange 12, and it is connected to a screw shaft 15 by a universal shaft 16 with a screw. The shaft 13 is eccentric by (a) relative to the guide body 10, and when it drills and advances, a drilling direction of the guide body 10 is changed. A one-way clutch 20 is interposed between the eccentric flange 12 and the shaft 13, and the drilling direction of the guide body 10 is changed by drilling and propelling of the cutter head 14 at the time of rotating in the drilling direction and by rotating the eccentric flange 12 by the one-way clutch 20 at the time of reversely rotating in the drilling direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a water supply pipe, a sewer pipe,
A simple method for controlling the digging direction of a small-diameter pipe propulsion machine and its device for burying small-diameter pipes used for gas pipes, power cable pipes, communication cable pipes, etc. in the ground by remote control with high accuracy. Position of the cutter head center axis with respect to the center axis of the lead conductor by various mechanisms and methods,
The present invention relates to technology for controlling direction.

[0002]

[Prior art]

(1) First, the general configuration of a general small-diameter pipe propulsion device and its propulsion method will be described. FIG. 10 is an overall configuration diagram of a small-diameter pipe propulsion machine. A propulsion stand 2 is installed on the starting shaft 1 and a pre-conductor 3 having a cutter head at its tip has a predetermined stroke in the propulsion direction. It is mounted so that it can slide. Reference numeral 4 is a propulsion jack that obtains a reaction force from the rear wall of the starting shaft 1 to propel the front conductor 3 through the push plate 5, and 6 is a drive device that is mounted on the propulsion base 2 and rotationally drives the cutter head. . Reference numeral 7 is a transit (or laser theodolite) installed behind the drive device 6 for measuring the position of the front conductor 3.

In the construction work, the drive device 6 rotates the cutter head to excavate the front conductor 3 while propelling the jack 4.
And push it by the length of one buried pipe (PVC pipe or fume pipe) containing a screw for soil removal, the push jack 5 pushes the push plate 5 by the length of one of the buried pipe. Then, it is moved backward, and a trailing buried pipe is connected between the trailing end of the leading buried pipe and the push plate 5 to propel again. This operation is repeated until the shaft reaches the vertical shaft. On the way, the position of the tip conductor 3 is measured with a transit or laser theodolite 7, and when it is deviated from a predetermined position, the excavation direction is changed to correct the direction, and the excavation is performed in the predetermined direction.

(2) Next, the following two techniques will be described with respect to a propulsion direction control device for a small-diameter pipe propulsion device and its method. 1) Device and Method for Controlling Direction by Swinging Cutter Head First, the device will be described. FIG. 11 is a configuration diagram of a first conventional small-diameter pipe propulsion machine, in which a front conductor 50 is an outer cylinder 52.
And a casing 51 that serves as a guide for excavation and excavation, and a cutter head 53 that is swingably attached to the tip of the casing 51. The cutter head 53 swings by expanding and contracting a plurality of swing cylinders 54 arranged around the casing 51, and changes the propelling direction. Further, the cutter head 53 is a screw shaft 55 that is rotationally driven by the drive device 6.
Connected to. Reference numeral 60 is a buried pipe connected to the rear end of the front conductor 50. A laser target 61 is fixed to the outside of the casing 51, and the position of the front conductor 50 is constantly detected by the laser theodolite 62. The starting shaft 1, propulsion jack 4, and push plate 5 are shown in FIG.
Since it is the same as the above, its explanation is omitted. Next, the digging method will be described. In the case of laying a buried pipe in FIG. 11, the cutter head 53 is rotated by the drive device 6 via the screw shaft 55 to excavate, and the excavated earth and sand moves in the casing 51 by the screw shaft 55 to move to the casing 51. It is discharged into the starting shaft 1 from the rear end, and a vacuum pump car (not shown) or bucket 8
Etc. are carried to the ground.

Finally, the method of controlling the excavation direction is shown in FIG.
2 will be described. When the position of the target 61 is above the center of the scale 63 in (a), the front conductor 50 is below the target line as shown in the figure. In (b), the cutter head 5 is moved by the swing cylinder 54.
Turn 3 up. When propelled in (c), the direction is corrected and the position of the target 61 approaches the center of the scale 63. When the position of the target 61 reaches the center of the scale 63 in FIG.
0 is made horizontal and the direction correction is completed.

2) An apparatus and method for controlling the direction by providing a cutter head rotatably supported at the tip end of the tip conductor so that the center axis of the tip conductor is eccentric with respect to the tip conductor center axis. First, the device will be described. FIG. 13 shows the second
It is a block diagram of the conventional small diameter pipe propulsion machine of (A), (B) is a sectional view of the whole, (B) is a BB sectional view of (A), and (C) is a C arrow view of (A). is there. A second conventional small-diameter pipe propulsion machine shown in FIGS. 13A and 13C is provided with a cutter head 84 for excavating earth and sand at its tip. The cutter head 84 includes a screw shaft 80a extending from the center of the rear end of the cutter head 84 to the shaft 1 provided at the rear.
It is rotated by and excavates. The excavated earth and sand are taken into the cutter head 84, and the screw conveyor 8
By the rotation of the screw spring 80b provided around the screw shaft 80a of No. 0, it moves in the screw casing 80c and is discharged into the vertical shaft 1 at the rear.
The rotation of the screw shaft 80a is given by the drive device 6 provided in the shaft. On the outer peripheral portion of the leading conductor 81 provided at the tip of the screw casing 80c,
The eccentric blocks 85a to 85f are fixed at appropriate intervals. The cutter head 84 has the eccentric block 8
The outer peripheral surfaces of 5a to 85f are fitted so as to be rotatable. A buried pipe 83 is inserted at the rear end of the front conductor 81. The buried pipe 83 is propelled forward through the push plate 5 provided at the front of the propulsion jack 4 provided in the vertical shaft 1.
Therefore, the leading conductor 81 and the cutter head 84 are propelled forward. A one-way clutch 82 is provided between the rear end of the screw casing 80c and the rear portion of the screw shaft 80a. The one-way clutch 82 does not transmit the rotational force to the screw casing when rotating the screw shaft 80a during propulsion. On the other hand, when the screw shaft 80a is rotated in the opposite direction, the one-way clutch 82 transmits the rotational force to the casing, the lead conductor and the like.
As shown in FIG. 13C, a plurality of eccentric blocks 85a to 85f are sequentially provided in the circumferential direction between the case front end portion 81a and the cutter head 84 rear end portion 84a. The eccentric blocks 85a to 85f have the highest height of a certain eccentric block 85a and the lowest of the block 85d arranged on the opposite side in the diametrical direction. Then, with respect to the blocks arranged between them, the height is sequentially reduced in the circumferential direction centering on the highest eccentric block 85a. In other words, 85b and 85f are 8
It is lower than 5a, and 85c and 85d are lower than 85b and 85f. Therefore, the central axis of the cutter head 84 is
It is eccentric with respect to the central axes of the leading conductor 81 and the screw shaft 80.

Next, a method of controlling the excavation direction will be described. As described above, the central axis of the cutter head 84 is eccentric to the central axis of the leading conductor 81. Therefore, the outer diameter of the cutter head 84 on the eccentric block 85a side is larger than the outer diameter of the front conductor 81 by the amount of the eccentricity. The outer diameter of the cutter head 84 on the diametrically opposite side is retracted from the outer diameter of the front conductor 81 by the amount of eccentricity. Therefore, when the buried pipe 83 is propelled and excavated while rotating the cutter head 84, the front surface of the front conductor 81 on the retracted side of the cutter head 84 does not have the surface of the cutter head 84, and therefore receives the resistance of soil. On the other hand, on the side where the cutter head 84 is exposed, since the outside of the tip 81 is excavated as much as the outside of the tip conductor 81 is exposed, the resistance outside the outside of the tip conductor 81 is less. Become. In this way, the leading conductor 81 is brought closer to the side where the cutter head 84 is projected, and the excavation direction is
It will be bent in that direction. In this way, the conventional technique always advances toward either eccentric direction. When changing the excavation direction of the cutter head 84, if the screw shaft 80a is rotated in the direction opposite to the excavation direction, the one-way clutch 82 rotates the front conductor 81 via the case rear end portion 81b and the screw casing 80c. Therefore, the eccentric blocks 85a to 85f provided on the front conductor 81 are rotated, and the central axis of the cutter head 84 is eccentric with respect to the central axis of the front conductor 81 via the rear end portion 84a of the cutter head 84. The excavation direction of 84 is changed. The excavation direction is detected by the transit (or laser theodolite) 7 in the same manner as in FIGS. 11 and 12.

[0008]

[Problems to be Solved by the Invention]

(1) Device and Method for Oscillating Cutter Head 53 for Direction Control In the first conventional small-diameter pipe propulsion machine shown in FIG. 11, a hydraulic device and piping (for operating the oscillating cylinder 54) Or electrical equipment and wiring).
Then, it is necessary to add a hydraulic hose (or electric wiring) each time the buried pipe 60 is added, which causes a problem that the structure is complicated, the price is high, the operation is complicated, and the work takes time.

(2) A device for performing direction control by providing a cutter head 53 rotatably supported at the tip of the front conductor 50 at a position where the center axis of the cutter head 53 is eccentric with respect to the center axis of the front conductor. And Method In the second conventional small diameter pipe propulsion machine shown in FIG. 13, the excavation direction of the cutter 84 is changed by rotating the case and changing the eccentric position of the cutter head. That is, it is necessary to rotate the screw shaft and the casing as a whole opposite to the time of excavation. Therefore, the rear end portion 80a of the screw shaft 80 must be rotated in the direction opposite to the excavating direction in a state where the excavated soil is clogged between the screw shaft 80 and the case 81. Therefore, since the screw shaft 80, the earth and sand, and the entire case must be rotated, there is a problem that a large rotational torque is required to change the eccentric position.

The present invention has been made in view of the above problems, and the cutter head is rotatably supported at the tip of the tip conductor such that the center axis of the cutter head is eccentric with respect to the center axis of the tip conductor. In the excavation method of a small-diameter pipe propulsion machine, in which a small-diameter pipe propulsion machine is propelled while controlling the direction, the propulsion direction can be easily corrected, the structure is simple, the work time is short, and the economical An object is to provide a propulsion direction control method and its device.

[0011]

In order to achieve the above object, a direction control method for a small diameter tube propulsion machine according to the present invention is a cutter which is eccentrically supported by a tip of a leading conductor and is rotatably supported. In a propulsion method of a small-diameter pipe propulsion machine for providing and propelling, when the drive shaft of the cutter rotates in the opposite direction to the excavation direction, the excavation direction is controlled by changing the eccentric direction of the cutter with respect to the tip conductor,

Further, the direction control device for a small-diameter pipe propulsion device according to the present invention is provided with a cutter, which is eccentrically and rotatably supported by the tip of the front conductor, rotatably supported on the tip of the front conductor. In the excavation direction control device, the cutter eccentric mechanism that drives the cutter, and also supports the cutter rotatably, and the cutter rotatably, and eccentrically supports the cutter on the leading conductor. The one-way clutch, which is provided between the cutter eccentric mechanism and the cutter, transmits only the rotation in the direction opposite to the excavation direction, and the cutter eccentric mechanism is rotatably supported by the leading conductor at its outer diameter portion. The cutter is rotatably supported by the inner diameter part and is composed of an eccentric plate having an opening for passage of excavated earth and sand, and the screw shaft and the cutter head drive shaft are connected by a universal joint. It was.

[0013]

According to the present invention, since the one-way clutch is provided between the cutter head eccentric mechanism and the screw shaft, only the rotation in the direction opposite to the excavation direction is transmitted from the screw shaft to the cutter head eccentric mechanism. When the screw shaft rotates in the excavation direction (forward), the one-way clutch does not transmit its rotational force to the cutter head eccentric mechanism, so the cutter head eccentric mechanism does not rotate.
When the screw shaft is rotated in the direction opposite to the excavation direction, the one-way clutch transmits its rotational force to the cutter head eccentric mechanism, so that the cutter head eccentric mechanism rotates. Therefore, only when the screw shaft is rotated in the reverse direction, the eccentric position of the cutter head can be changed and the direction can be controlled by the rotation of the cutter head eccentric mechanism. The reason why the excavation direction changes from the center axis direction of the lead conductor when the center axis of the cutter head is located eccentric to the center axis of the lead conductor is the same principle as the conventional example.

Next, the eccentric mechanism of the present invention is an eccentric flange, which rotatably supports the shaft with its inner diameter and is rotatably supported by the lead conductor with its outer diameter, so that the eccentric flange rotates. Then, the position of the inner diameter portion of the eccentric flange also rotates. Therefore, the position of the shaft supported by the inner diameter portion also rotates, and the central axis of the cutter head supported by the shaft can also rotate.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The small-diameter tube propulsion apparatus of the present invention performs direction control by making the central axis of the cutter head 14 eccentric from the central axis of the leading conductor 10 and changing the eccentric position. Examples will be described below.

First, the overall structure of the small diameter tube propelling machine according to the first embodiment of the present application will be described. 1 is a configuration diagram of a tip end portion of a first embodiment of a small diameter tube propulsion device, and FIG. 2 is a sectional view taken along line AA of FIG. That is, the casing 11 for guiding the excavated earth and sand is provided inside the front conductor 10. And
An inner boss 12 rotatably attached to the tip of the leading conductor 10.
An eccentric flange 12 including a, 12b and a disk portion 12c is provided. The eccentric flange 12 has a structure in which the shaft of the eccentric flange 12 is displaced from the center, and the distances from the shaft to the outer diameter of the eccentric flange 12 are different from each other.
Further, the eccentric flange 12 of the present application has an opening on its surface, and the earth and sand excavated by the cutter head 14 described later is discharged rearward through the opening. Eccentric flange 1
A shaft 13 is pivotally supported on the eccentric shaft 2. A cutter head 14 is provided at the tip of the shaft 13. Therefore, the central axis of the leading conductor 10 and the central axis of the cutter head 14 are eccentric by the eccentricity (a) of the eccentric flange 12.

A screw shaft 15 is rotatably supported at the center of the casing 11. The screw shaft 15 is connected to the shaft 13 by a universal shaft 16 with a screw. Therefore, the center axis of the screw shaft 15 and the center axis of the shaft 13 are eccentric by the eccentricity (a) of the eccentric flange 12, but the rotational force can be transmitted without difficulty. The screw shaft 15 is hollow, and a target 17 made of a light emitting diode is attached to the tip of the hollow hole, and the position is monitored by the transit 7 installed in the starting shaft 1 described in FIG. . A buried pipe 18 is inserted behind the front conductor 10.

The central axis of the cutter head 14 of this embodiment is
As described above, the center axis of the front conductor 10 is eccentric to the eccentric flange 1.
The eccentricity is 2 (a). Therefore, the outer diameter of the cutter head 14 is larger than the outer diameter of the front conductor 10 by the eccentricity (a) on the long diameter side (a side) of the eccentric flange 12. On the contrary, on the short diameter side (b side) of the eccentric flange 12, the eccentric portion (a) is retracted from the outer diameter of the front conductor 10. Therefore, when the leading conductor 10 is driven and excavated while rotating the cutter head 14, the excavated surface of the leading conductor 10 does not have the cutter head 14 surface on the side B, and thus receives the resistance of soil. On the other hand, on the side a, since the outside of the outer diameter side of the front conductor 10 corresponding to the cutter head 14 is excavated, the resistance on the outer side of the outer diameter side of the front conductor 10 is reduced. In this way, the front conductor 10 is brought closer to the side a, and the excavation direction is bent to the side a. As described above, in the present application, since the central axis of the cutter head 14 is always eccentric to either of the central axes of the leading conductors 10, the excavation direction is always in the direction of the central axis of the cutter head 14.

Next, a means for changing the excavation direction will be described. In FIG. 1, a one-way clutch 20 is interposed between the eccentric flange 12 and the shaft 13. 2 is shown in FIG.
The shaft 13 and the front conductor 10 are eccentric by a in the A-A cross section of FIG.
0 is interposed, and the eccentric flange 12 is provided with a hole 21 for discharging excavated sediment. FIG. 3 shows A of FIG.
FIG. 4 is a partially enlarged view of a section A, showing the details of the one-way clutch 20 interposed between the shaft 13 and the eccentric flange 12. In FIG. 3, the shaft 2 has a hole 2
1, a stopper key 2 having a slope 23 on one surface
2 is inserted and is urged outward by a spring 24. A groove 25 having an inclined surface is provided on one side of the inner diameter of the eccentric flange 12 and is engaged with the stopper key 22. When the shaft 13 rotates in the excavating direction (counterclockwise rotation), the stopper key 22 has the slope 24 and the spring 24.
Is pushed into the hole 21 against the force of the eccentric flange 12
Does not rotate. That is, excavation is performed by rotating the cutter head 14 while rotating only the shaft 13 without rotating the eccentric flange 12.

When the shaft 13 is rotated in the direction opposite to the excavation direction (right rotation), the stopper key 22 engages with the groove 25 and the eccentric flange 12 rotates right (reverse direction). That is, the eccentric position of the eccentric flange 12 can be changed by rotating the shaft 13 in the direction opposite to the excavation direction (clockwise rotation). Since the position of the shaft 13 of the cutter head 14 supported by the inner diameter of the eccentric flange 12 also changes accordingly, the eccentric position of the central axis of the cutter head 14 with respect to the central axis of the front conductor 10 changes.

Further, a method of controlling the digging direction of the leading conductor 10 will be described. As shown in FIG. 1, the direction control is performed by measuring a target 17 provided in the screw shaft 15 in the front conductor 10 from a transit (not shown) installed in the vertical shaft, and measuring the target 17 of the current front conductor 10. Detect the position of the central axis. 4 (A), (B) to FIGS. 7 (A), (B)
(A) shows the relationship between the position of the front conductor 10 and the positions of the shaft 13 and the one-way clutch 20,
(B) shows the relationship with the state of the target measured from the transit, and shows the relationship between (A) and (B). Here, the central axis of the shaft 13 is at the same position as the central axis of the cutter head 14 supported by the shaft 13, and means the direction in which the front conductor 10 advances. As for the state of the target measured from the trancit, the trancit line of sight 27 is provided in the field of view 26 of the transit, and the three light points 27a, 17b, and 17c (light emission) displayed on the target plate 17 are located in the back. Diodes, etc.) are observed.

The light spot 17a at the center of the target plate 17
Represents the position of the central axis of the leading conductor 10, and the collimation line 27
The center X indicates the target position of the excavation of the center axis of the precursory conductor 10 to be excavated. That is, the time when the light spot 17a and the center X of the line of sight 27 of the transit coincide with each other is the time when the light is advancing in the correct excavation direction. Further, the three light points represent the radial direction of the shaft 13 and the screw shaft 15, and the angle at which the shaft 13 and the cutter head 14 rotate via the one-way clutch 20 when the screw shaft 15 is rotated in the reverse direction. Can be measured.
Here, the light spots 17a to 17c and the one-way clutch 2
The position of 0 is the same.

The excavation direction control means will be described below in sequence. (1) At the start of excavation As shown in FIG. 4 (B), the center 17a of the target and the center X of the collimation line 27 of the transit are aligned.
Here, the positional relationship between the shaft 13 and the front conductor 10 is such that the center of the shaft 13 is the front conductor 1 as shown in FIG.
An example will be described in the case where the center of 0 is shifted upward. In this state, the shaft 13 is normally rotated as shown by the arrow to excavate. (2) During excavation, when the central axis of the front conductor 10 is displaced upward from the excavation target position. When excavating in the state of FIG.
Therefore, the center axis of the front conductor 10 is displaced upward from the target position for excavation, and the center 17a of the target 17 is located at the center X of the collimation line 27, as shown in FIG. 5B.
It is observed to be shifted upward with respect to.

(3) When correcting the direction Then, as shown in FIG. 6A, the shaft 13 is reversely rotated as shown by the arrow to engage the one-way clutch 20 with the boss portion 12a of the eccentric flange 12. , Target 1
The light spots (17a to 17c) of No. 7 are oriented in the opposite position (horizontal direction) to the initial position (horizontal direction) shown in FIG. 4 (B). As a result, the central axis of the boss portion 12a of the eccentric flange 12 is radially opposite to the initial position shown in FIG. 4A, as shown in FIG. 6A, and the central axis of the cutter head 14 is eccentric. The position is also the opposite of the initial position (eccentric by a downward).

(4) When excavating after correcting the direction Then, as shown in FIG. 7A, when the shaft 13 is rotated forward as shown by the arrow, the cutter head 14 continues to excavate downward. The leading conduit 10 changes the excavation direction downward, and as shown in FIG.
The center 17a of 7 is corrected in a direction coinciding with the center X of the collimation line 27. In this way, when the direction of the leading conduit 10 is deviated, the screw shaft 15 is rotated in the reverse direction, and the eccentric position of the cutter head 14 is changed to proceed with excavation. As described above, the propulsion device of the present invention essentially excavates in the direction in which the central axis of the cutter head 14 does not always coincide with the central axis of the leading conduit 10 (ie, does not advance straight). It has the property of going forward. Therefore, by repeating the above-described operation, the leading conductor 10 makes a fine zigzag march and can be propelled in the target direction as a whole. In this way, since the mechanism related to direction correction for direction correction is simple,
The work time for direction correction is short and economical.

FIG. 8 is a front view of a one-way crack 30 according to the second embodiment, in which a groove 31 provided in the eccentric flange 12 is provided with a stopper key 32 at one end thereof.
It is mounted so as to be swingable about 3, and is biased toward the shaft 13 by a spring 34. A stepped portion 35 is provided on the shaft 13 so as to engage with the other end of the stopper key 32. When the shaft 13 is normally rotated (counterclockwise) during excavation, the stopper key 32 swings against the force of the spring 34, and the eccentric flange 12 does not rotate. When the shaft 13 is rotated in the reverse direction (clockwise rotation), the stopper key 32 and the stepped portion 35 are engaged with each other, and the eccentric flange 12 rotates clockwise.

FIG. 9 is a block diagram of the second embodiment of the small-diameter tube propulsion machine. The description of the parts having the same components and reference numerals as those of the first embodiment will be omitted, and only the different parts will be described. An eccentric flange 40 is attached to the tip of the leading conductor 10 by a bolt 4
It is fastened by 1. A discharge port 43 for discharging excavated soil is provided at the rear end of the casing 42 fixed to the inside of the front conductor 10, and a one-way clutch is provided between the casing 42 and the screw shaft 44 that is driven to rotate by the drive device 6. When the screw shaft 44 is rotated forward, the casing 42 does not rotate, and the cutter 14 performs the excavation propulsion. When the screw shaft 44 is rotated in the reverse direction, the one-way clutch 4
5 is engaged to rotate the eccentric flange 40 to change the eccentric position. The one-way clutch 4
The configuration of No. 5 is the same as that described above, and the description thereof is omitted. The target 17 is monitored by the transit 7 during construction, and when the center position is deviated, the screw shaft 44 is reversely rotated to rotate the casing 42, the eccentric flange 40 is rotated to change the eccentric position, and the excavation direction is changed. .

[0028]

As described in detail above, since the present invention has the above-described structure, the cutter driving screw shaft is advanced in the excavating direction to advance, and the cutter driving screw shaft is rotated in the reverse direction to excavate the cutter. The excavation direction can be changed by changing the eccentric direction, and the excavation can be performed in the target direction. As described above, the propulsion device of the present invention does not need to rotate the screw case in order to change the excavation direction, and thus the rotational torque can be small. Further, unlike the cutter head swing method, since a hydraulic device and piping are not required, it is not necessary to add a hydraulic hose or electric wiring every time an embedded pipe is added. Accordingly, the structure and the operation are easy, the working time is short, and the economical method for controlling the excavation direction of the small diameter pipe propulsion machine and the apparatus therefor can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a tip end portion in a first embodiment of an excavation direction control device for a small diameter pipe propulsion device of the present invention.

FIG. 2 is a view showing an AA cross section of the eccentric flange in FIG.

FIG. 3 is a diagram showing a first embodiment of the one-way clutch in FIG.

FIG. 4 is a diagram showing the relationship between the eccentric position of the eccentric flange 12a and the field of view 26 of the transit at the start of excavation in the embodiment of the present invention, (A) showing the positional relationship of the shaft 13 with respect to the front conductor 10. FIG. 1B is a diagram showing the field of view 26 of the transit.

FIG. 5 is a first explanatory diagram for explaining the first embodiment of the present invention, and is a diagram showing a case where the central axis of the front conductor 10 is displaced upward from the excavation target position during excavation. (A) is the leading conductor 10
FIG. 6 is a diagram showing a positional relationship of the shaft 13 with respect to FIG.

FIG. 6 is a second explanatory view for explaining the first embodiment of the present invention, and shows the time when the direction is corrected. (A) is a diagram showing a positional relationship of the shaft 13 with respect to the leading conductor 10,
(B) is a diagram showing a field of view of a transit.

FIG. 7 is a third explanatory diagram for explaining the first embodiment of the present invention, and is a diagram showing a time of excavation after direction correction.
(A) is a figure which shows the positional relationship of the shaft 13 with respect to the front conductor 10, (B) is a figure which shows a visual field of a transit.

FIG. 8 is a diagram showing a second embodiment of the one-way clutch in FIG.

FIG. 9 is a diagram showing a second embodiment of the excavation direction control device for a small diameter pipe propulsion machine of the present invention.

FIG. 10 is an overall configuration diagram of a small diameter tube propulsion device.

FIG. 11 is a diagram showing a first conventional small-diameter pipe propelling machine.

12 is an explanatory diagram of a first example of the excavation direction control method of FIG. 11. FIG.

FIG. 13 is a diagram showing a second conventional small-diameter pipe propelling machine.

[Explanation of symbols]

1 ... Starting shaft, 10 ... Lead conductor, 12, 40 ... Eccentric flange, 13 ... Shaft, 14 ... Cutter head,
15,44 ... Screw shaft, 16 ... Universal shaft with screw, 20,30,45 ... One-way clutch

Claims (3)

[Claims] 1. A small diameter for digging while controlling the direction by providing a cutter head rotatably supported at a position where the center axis of the cutter head is eccentric with respect to the center axis of the leading conductor at the tip of the leading conductor. In the method for controlling the excavation direction of a pipe propulsion device, when the drive shaft of the cutter head rotates in the opposite direction to that in the case of excavation, the eccentric position of the cutter head is changed to control the excavation direction. Method of controlling excavation direction of propulsion machine. 2. A small diameter for digging while controlling the direction by providing a cutter head rotatably supported at a position where the center axis of the cutter head is eccentric with respect to the center axis of the leading conductor at the tip of the leading conductor. In the excavation direction control device for a pipe propulsion device, the propulsion direction control device having the following configuration. A) A cutter which is rotatably supported at the tip of the tip conductor by a shaft for driving the cutter head and also for discharging the sand and a screw shaft, and b) which is adjustably supported by the tip conductor and the shaft. A cutter head supported by a head eccentric mechanism at a position where the central axis of the cutter head is eccentric with respect to the central axis of the tip conductor. C) A one-way clutch provided between the cutter head eccentric mechanism and the shaft. D) The one-way clutch is a one-way clutch that transmits only the rotation in the direction opposite to the excavation direction from the shaft to the cutter head eccentric mechanism. 3. The cutter head eccentric mechanism according to claim 2, wherein the eccentric flange is an eccentric flange, the inner diameter of which is rotatably supported by the shaft, and the outer diameter of which is rotatably supported by the lead conductor. A digging direction control device for small diameter pipe propulsion machines.