JPH0344633B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a device for burying a pipe while excavating a hole using an excavator, and particularly to a burying device suitable for burying a small-diameter pipe.

(Prior art) As one of the devices that buries pipes for storing power lines, gas pipes, water pipes, etc. by inserting them into the hole while excavating a hole underground, a cutter head is rotated by a cylindrical propulsion head. There is a burial device consisting of a removably supported excavator and a propulsion device located at the rear of the excavator, which rotates the cutter head and advances the excavator. The burying device uses a propulsion device to rotate the cutting head and move the excavator forward through the pipe to be buried, from one working hole vertically formed in the ground to the next working hole. When the pipe is immersed into the ground from the working shaft, the next pipe is connected to the pipe, and the pipe is dug again.

However, with conventional pipe burying equipment, the direction of excavation cannot be corrected, so if there is an error in the setting of the direction of excavation at the start of excavation, it will not be possible to proceed to the next working hole, and therefore Skill is required to operate and control the equipment, and the spacing between the working holes must be shortened.

2. Description of the Related Art There is a burying device that is equipped with a correction mechanism that corrects the direction of excavation by an excavator during excavation, such as a tunnel excavation device that excavates a tunnel with a diameter of several meters to several tens of meters. However, this device uses a jack installed inside the excavator to correct the direction, so the diameter of the excavator is large, at least 35 cm, and therefore the power line,
The diameter for burying gas pipes, water pipes, etc. underground
It is not possible to bury a pipe of about 10 cm.

(Objective of the Invention) An object of the present invention is to provide a pipe burying device that can correct the excavation direction during excavation, has a simple structure, and can bury small-diameter pipes.

(Structure of the Invention) The present invention is a pipe burying device that includes an excavator and a propulsion device that advances the excavator, wherein the excavator has a connecting portion for connecting a pipe to be buried at a rear end thereof. an outer cylinder having an outer cylinder, an inner cylinder arranged movably in the axial direction inside the tip of the outer cylinder and protruding forward from the outer cylinder, and an inner cylinder rotatably extending through the inner cylinder and the outer cylinder. a dirt discharge mechanism having a screw conveyor arranged therein; a cutter head attached to the tip of the screw conveyor; and a propulsion device surrounding the cutter head and rotatably supported outside the tips of the outer cylinder and the inner cylinder. a propulsion head having a first surface that contacts a pressing surface at the tip of the outer cylinder during propulsion and a second surface that contacts the pressing surface at the tip of the inner cylinder; a spherical bearing disposed between the inner cylinder and the propulsion head; teeth provided on the rear surface of the cutter head; The propulsion device includes a rotation source that rotates the screw conveyor and a gear that can engage with the teeth, and the propulsion device includes a rotation source that rotates the screw conveyor, and a gear that moves the screw conveyor backward with respect to the outer cylinder and the inner cylinder to rotate the screw conveyor. a reciprocating motion source that engages each other, and a propulsion means that advances the earth and sand discharge mechanism and the outer cylinder, and the pressing surface of the inner cylinder and the second surface of the propulsion head are arranged so that the inner cylinder and the They are non-parallel when the central axes of the heads are aligned.

(Effects of the Invention) According to the present invention, the screw conveyor for discharging excavated earth and sand is moved backward and rotated by a predetermined amount to rotate the propulsion head relative to the outer cylinder, thereby adjusting the direction of inclination of the propulsion head relative to the outer cylinder. That is, since the attitude can be changed, the propulsion direction can be corrected during excavation. In addition, the structure is such that the cutter head is provided with teeth and the propulsion head is provided with gears to rotate the propulsion head relative to the outer cylinder to correct the propulsion direction. The diameter is small and therefore the structure is simple, allowing smaller diameter pipes to be buried.

(Example) The embodiments shown in the drawings will be described below.

The burial device 10 shown in FIGS. 1 to 3 includes an excavator 12 shown in FIG. 1 for excavating the ground, and a propulsion device 14 shown in FIG. 3 for pushing the excavator from behind. include. The pipe 16 shown in FIG. 2 to be buried has a certain length dimension, and the pipe 16 shown in FIG.
2 and the propulsion device 14. Excavator 12
As the excavator 12 and propulsion machine 14 move forward,
As the distance between them increases, multiple pipes are placed between them. In this case, the pipes are connected to each other by welding.

As shown in FIG. 1, the excavator 12 has an outer cylinder 18.
The central axis of the outer cylinder 18 is located inside the tip of the outer cylinder.
An inner cylinder 20 that is arranged to be slidable in the OP direction, an earth and sand discharge mechanism 22 that is arranged to penetrate through the inner and outer cylinders, a cutter head 24 that is attached to the tip of the earth and sand discharge mechanism, and A propulsion head 26 surrounds the cutter head and is rotatably supported outside the tip of the inner cylinder 20, and the inner cylinder 20 is connected to the outer cylinder 22.
and a moving means 28 for moving the vehicle forward along the central axis OP.

The outer cylinder 18 receives the pipe 1 at its rear end.
It has a connecting part 30 with which the tip of No. 6 comes into contact. The inner cylinder 20 protrudes further forward than the outer cylinder 18, and the propulsion head 2 is supported by a spherical bearing 32 on the protruding portion.
6 is rotatably supported.

The earth and sand discharge mechanism 22 includes an outer cylinder 18 and an inner cylinder 20.
It has a cylindrical cover 34 penetrating through the cover 34 and a screw conveyor 36 passing through the cover, and the excavated earth and sand is conveyed inside the cover 34 by the screw conveyor 36. The screw conveyor 36 includes a rotating shaft 38 and blades 40 extending spirally around the rotating shaft 38.
and has. The rotary shaft 38 has a hole 42 extending from its rear end along the axis, and a propulsion position indicator 44 is provided at the end of the hole. As shown in FIG. 4, the propulsion position support 44 is a disk having a plurality of concentric circles 46 drawn thereon, and is attached to the rotating shaft 38. The propulsion position indicator 44 indicates the center position in the excavation direction of the excavator 12, and it is particularly preferable to provide a light emitter at the center. A method of confirming the propulsion position using the propulsion position indicator 44 will be described later.

The cover 34 and the rotating shaft 38 have coupling portions 50 and 52 at their rear ends for coupling the next earth and sand discharge mechanism 222 by coupling means such as bolts. As shown in FIGS. 1 and 5, the coupling portion 50 is a flange, and the coupling portion 52 is a plurality of protrusions that protrude in the diametrical direction of the rotating shaft 38.

As shown in FIGS. 1, 6 and 7, the cutter head 24 has one end attached to the screw conveyor 3.
It has a plurality of arms 54 attached to the tip of the rotating shaft 38 of No. 6, and a cutter 56 is attached to the tip of the arm. Each arm 54 has gear teeth 58 on its rear surface, as shown in FIG.

As the excavator 12 advances, the earth and sand discharge mechanism 222, which is disposed between the excavator 12 and the propulsion device 14 together with the pipe 16 to be buried, is connected to a cover 234 and a screw conveyor, as shown in FIG. 23
It consists of 6. The screw conveyor 236 has a rotating shaft 238 and blades 2 extending spirally around its outer circumference.
40, and the rotating shaft 238 has a hole 242 passing through it in the direction of its central axis. Both longitudinal ends of the cover 234 and the rotation shaft 238 have coupling parts 250 and 252 for connecting with the cover and rotation shaft of an adjacent earth and sand discharge mechanism. The earth and sand discharge mechanism 222 is connected so that the holes 242 are aligned with the holes of the adjacent screw conveyor. For this reason,
The propulsion position indicator 44 can be visually observed from the rear of the final stage screw conveyor.

The propulsion head 26 has a recess 60 for receiving the cutter head 24 in which the cutter head 24 is inserted.
A gear 62 that faces and can engage with the teeth 58 of
has. The propulsion head 26 is connected to the outer cylinder 18 during propulsion.
a first surface 66 that contacts the pressing surface 64 at the tip of the
A second surface 70 that contacts the pressing surface 68 at the tip of the inner cylinder 20 is provided on the rear surface. When the central axes of the outer cylinder 18, the inner cylinder 20, and the cutter head 16 are aligned, the pressing surfaces 64, 68 and the first surface 66 are perpendicular to the central axes and parallel to each other. On the other hand, as shown in FIG. 1, the second surface 70 is non-parallel to the pressing surfaces 64 and 68 and is inclined at an angle θ with respect to the pressing surface 68 which is perpendicular to the central axis.

Propulsion head 16 has a rotation direction indicator 72 that indicates the direction of rotation of propulsion head 26 relative to outer cylinder 18 and inner cylinder 20. The rotation direction indicator 72
extends rearward between the inner cylinder 20 and the cover 34,
It has a flange 74 at its rear end, on which sensing objects 78 for a plurality of sensors 76 are provided, as shown in FIGS. 1 and 8. The detected object 78
is arranged at a position corresponding to the portion of the second surface 70 that is closest to the pressing surface 68.

Each sensor 76 is supported by a support wall 80 provided within the outer cylinder 18, and as shown in FIG.
A plurality of them are arranged at equal intervals at a constant angle on the same circle that faces the rotation locus of the detection object 78 when the propulsion head 26 rotates around the central axis with respect to the outer cylinder 18. In the illustrated example, the sensor 76 is a photosensor consisting of a pair of a light emitting element and a light receiving element,
The light beam from the light emitting element is directed toward the detection object 78, and the reflected light from the detection object 78 is received by the light receiving element, thereby outputting a sensing signal. The sensing signal is output from a sensor facing the detection object 78. The detection object 78 is a reflector in the illustrated example.

A sensing signal from the sensor 76 is supplied via a cable 82 to a control board 146, which will be described later.
6 is used as a signal indicating the position of the portion of the second surface 70 of the propulsion head 26 that is closest to the pressing surface 68 of the inner cylinder 20. A connector 84 is provided at the end of the cable 82.
An intermediate cable 282 is placed between the cable 82 and the control board 146 each time the pipe 16 to be buried is placed on the rear side of the propulsion device 12.

The moving means 28 includes a cylinder portion 8 having a recess 86 formed in the circumferential direction on the inner circumferential surface of the tip portion of the outer cylinder 18.
8, a piston part 90 provided in the circumferential direction on the outer periphery of the inner cylinder 20 and movable in the direction of the central axis within the recess 86, and a recess 86 for moving the piston part forward.
The high-pressure hose 92 is connected to a high-pressure fluid source that supplies high-pressure fluid such as high-pressure air or liquid to a portion on the rear side of the piston portion 90 . In this moving means 28, when correcting the direction of excavation by the excavator 12, high-pressure fluid is supplied to a portion of the recess 86 on the rear side of the piston portion 90, so that the piston portion 90 moves inside the recess 86. The inner cylinder 20 is moved forward relative to the outer cylinder 18 to advance the inner cylinder 20 relative to the outer cylinder 18 and press the pressing surface 68 of the inner cylinder 20 against the second surface 70 of the propulsion head 26 . Between the high-pressure hose 92 and the source of high-pressure fluid, an intermediate high-pressure hose 292 is arranged each time a pipe 16 is arranged between the excavator 12 and the propulsion machine 14 .

Note that the moving means 28 may be any other means, such as a plurality of cylinder mechanisms attached to the outer cylinder 18, as long as it is a means for advancing the inner cylinder 20 relative to the outer cylinder 18. In this case, each cylinder mechanism is
They are arranged at equal intervals around the central axis OP.

Propulsion head 26, outer cylinder 18 and cover 34
Sealing materials 94 and 96 are arranged between the two.

During excavation, the outer cylinder 18 and cover 3 of the excavator 12
4 is a pipe 1 in which the propulsion force of the propulsion device 14 should be buried.
6 and intermediate cover 234;
The rotational force of the propulsion device 14 is applied to the cutter head 24 on the rotating shafts 38, 23 of the screw conveyors 36, 236.
8. During this digging, if the moving means 28 is not operating, the inner cylinder 20 is retreating with respect to the outer cylinder 28, so the propulsion head 26
The surface 66 of the outer cylinder 18 comes into contact with the pressing surface 64 of the outer cylinder 18, and the first
The outer cylinder 18 moves forward by pushing the surface 66 of the outer cylinder 18 . Therefore, the excavator 12 moves forward along the central axis OP of the outer cylinder 18 with the central axes of the outer cylinder 18 and the propulsion head 26 aligned.

On the other hand, when the moving means 28 is supplied with high-pressure fluid and the inner cylinder 20 is moving forward relative to the outer cylinder 18 during excavation, the propulsion head 26 has the second surface 70 aligned with the pressing surface 68 of the inner cylinder 20. , and moves forward by pushing the second surface 70 by the inner cylinder 20.
The spherical bearing 32 assumes an inclined position with respect to the outer cylinder 18 as shown in FIG. Therefore, in the excavator 12, the propulsion head 26 is θ with respect to the outer cylinder 18.
The excavator 12 advances in the axial direction of the propulsion head 26, thereby changing the direction of propulsion.

The posture of the propulsion head 26 with respect to the outer cylinder 18, that is, the direction of excavation, is determined by moving the screw conveyor 36 backward so that its teeth 58 engage with the gear 62 of the propulsion head 26, and in this state, rotating the screw conveyor 36 by a predetermined angle for propulsion. This can be changed by rotating the head 26 with respect to the outer cylinder 18 by a predetermined angle.

After completing the correction of the excavation direction, the moving means 28
What is necessary is to stop the supply of high-pressure fluid to the excavation and start excavation with the end of the high-pressure hose 92 open. In this way, the excavator 12 can move the pressing surface 64 of the outer cylinder 18 toward the first surface 6 by moving the inner cylinder 20 backward with respect to the outer cylinder 18 as the outer cylinder 18 moves forward.
6, the propulsion head 26 moves forward while correcting its attitude with respect to the outer cylinder 18, and after the pressing surface 64 of the outer cylinder 18 abuts the first surface 66, the center of the outer cylinder 18 and the propulsion head 26 Move forward with the axes aligned.

As shown in FIGS. 3 and 11, the propulsion device 14 includes a propulsion means 100 for advancing the earth and sand discharge mechanism 22 and the outer cylinder 18, and a screw conveyor 36.
The tooth 5 is moved backward with respect to the outer cylinder 18 and the inner cylinder 20.
A reciprocating motion source 102 that engages 8 and the gear 62
and a rotation source 104 such as a hydraulic motor that rotates the screw conveyor 36. Rotation source 1
04 may be a pneumatic motor or an electric motor.

The propulsion means 100 includes a pressing body 108 supported by a base 106 so as to be movable back and forth, and a pair of jacks 110 that move the pressing body 108 back and forth. As shown in FIG. 3, the rear end of the final stage pipe 16 and the cover 234 come into contact with the front end surface 112 of the pressing body 108.

The reciprocating motion source 102 consists of a cylinder 114 whose distal end is attached to the base 106, a piston 116 passing through the cylinder, and a shaft 118 rotatably supported by the piston. cylinder 11
4 has a recess 120 formed on its inner peripheral surface and two openings 12 for supplying and discharging high-pressure fluid to the recess.
2,124. The piston 116 has a protrusion 126 along its outer circumferential surface that fits into the recess 120, and the high-pressure fluid flows from the opening 122 on the tip side to the recess 1.
22 , it moves backward with respect to the cylinder 114 , and when it is fed into the recess 120 through the opening 124 on the rear end side, it moves forward with respect to the cylinder 114 .

The shaft 118 has a hole 128 passing through it in the axial direction.
It has a flange 130 at its tip end for connection to a connecting portion 252 of a final stage screw conveyor 236, which will be described later. The shaft 118 is also rotatably supported relative to the piston 116 but not axially movable. The rear end of the shaft 118 reaches the rotation source 104 and is axially movably but non-rotatably coupled to the rotation source.

The base 106 is installed at the bottom of a working pit formed in the ground. As shown in FIG. 3, the base 106 is formed with an opening 132 for discharging earth and sand to the outside.

During excavation, the propulsion device 14 advances the pressing body 108 using the jack 110 while rotating the shaft 118 using the rotation source 104 while supplying high pressure fluid to the cylinder 114 from the opening 124 of the reciprocating source 102 . When high pressure fluid is supplied to the cylinder 114 from the opening 124, the shaft 118 moves forward relative to the pressing body 108, so that the cutter head 2 of the excavator 12
4 advances relative to the propulsion head 26, and the teeth 58 and gear 62 are disengaged. Further, when the pressing body 108 moves forward, the reciprocating mechanism 102 and the rotation source 10
4 moves forward. Therefore, the cutter head 24 and the screw conveyor 36, 236 are rotated by the rotation of the shaft 118, and the pipe 16, the outer cylinder 18, the propulsion head 26, the cover 34, 234, the screw conveyor 36, 236, and the cutter head 24 are rotated by the rotation of the shaft 118. and is advanced by the advancement of the reciprocating motion source 104.

When correcting the digging direction, first, the reciprocating motion source 10
By supplying high pressure fluid to the opening 122 of No. 2, the shaft 118 is retracted with respect to the pressing body 108. This causes the screw conveyor 36, 236 to move backward, so that the teeth 58 and the gear 62 of the excavator 12
can be interlocked. In this state, next, the rotation source 104
is operated, and the shaft 118 is rotated by a predetermined angle. This causes the screw conveyor 36, 236 and the cutter head 24 to rotate, and the propulsion head 26
is rotated by a predetermined angle with respect to the outer cylinder 18. Then,
High pressure fluid is supplied to the cylinder 114 from the opening 124 and the shaft 118 is advanced relative to the pressing body 108. While the shaft 118 is rotated by the rotation source 104, the pressing body 108 is advanced by the jack 110. As a result, the excavator 12 moves forward while the cutter head 24 rotates with the teeth 58 and gear 62 disengaged. During this forward movement, the excavator 12 corrects the direction of excavation, as described above.

A transit 134 is disposed behind the propulsion machine 14 in order to confirm the position of the excavator 12 in the excavation direction with respect to the planned reference line using the propulsion position indicator 44. The transit 133 is a known type that supports a telescope 136 on a tripod and is used to measure the horizontal angle between two points during surveying.
The transit 134 is arranged such that the center axis of its telescope 136 is used as a planning reference line in the propulsion direction and coincides with the center axis of the shaft 118.

When confirming the position in the propulsion direction with respect to the planned reference line using the transit 134, the propulsion position indicator 44 is visually observed through the shaft 118 and the holes 128, 242, 42 of the screw conveyors 136, 36, and the What is necessary is to confirm the center position of the propulsion position indicator 44 on 134. In this way, if the excavation position is correct, the telescope 136 of the transit 134
The center of the propulsion position indicator 44 in the telescope 1
It coincides with the central axis line of No. 36, that is, the planning reference line. However, if the excavation direction deviates from the planned reference line, the propulsion position indicator 44 in the telescope 136
The center shifts in the direction of the deviation of the excavation position from the planning reference line.

That is, for example, if the direction of excavation by the excavator 12 is forward and downward with respect to the planning reference line 138, as shown in FIG. The positional relationship with the planning reference line 138 is shown in FIG. 12B. For this reason, the operator must check that the center 140 of the propulsion position indicator 44 is aligned with the planning reference line 138.
If it is lower than that, it can be known that the direction of excavation is forward-downward, that is, the excavation position is too downward.

Thus, the center 140 of the propulsion position indicator 44 relative to the planning reference line 138 at the telescope 136
The position is to the left if the displacement of the propulsion position with respect to the planning reference line is to the left, to the right if to the right, and to the upper if it is above. For this reason, the operator
The deviation in the excavation direction can be determined based on the position of the center 140 of the propulsion position indicator 44 with respect to the planning reference line 138 on 6.

Control board 142 is located behind propulsion machine 14 and adjacent to transit 134, as shown in FIG. On the control board 142, as shown in FIG. (15 degrees in the example shown)
They are placed at equal intervals.

The output signal of each sensor 76 is supplied to a drive circuit for an indicator light 144. The sensing signal output from the sensor when sensing the detection object 78 is
It is used as a signal to turn on the indicator light corresponding to that sensor. Therefore, for example, as shown in FIG.
8, the sensor outputs a sensing signal, so the indicator light 144a located at the top of the control board 142 lights up. This allows the worker to
Of the second surface 70 of the propulsion head 26, the outer cylinder 18
It can be seen that the direction of rotation of the propulsion head 26 with respect to the rotation direction, that is, the portion closest to the pressing surface 68 of the inner cylinder 20 is upward.

The indicator light that lights up varies depending on the rotation angle of the propulsion head 26 with respect to the outer cylinder 18. For example, if the sensor facing the detection object 78 is located at the lowest end in FIG. 9, the indicator light in FIG. This is the indicator light located at the bottom, and if the sensor is located at the far left, it is the indicator light located at the far left, and if the sensor is located at the far right, it is the indicator light located at the far right. This is an indicator light.

The indicator light that lights up indicates that the shaft 118 is retracted by the reciprocating motion source 102, the screw conveyors 236, 36 and the cutter head 24 are retracted, the teeth 58 and the gear 62 are engaged, and the rotation source 102 is retracted.
4, shaft 118, screw conveyor 123
6, 36, by rotating the cutter 56 and the propulsion head 26.

During excavation by the burial device 10, the moving means 28 of the excavator 12 is maintained inactive, and the reciprocating motion source 102 of the propulsion device 14 is maintained in a state in which high pressure fluid is supplied to the cylinder 114 from the opening 124. Therefore, the shaft 118 moves forward relative to the pressing body, the cutter head 24 moves forward relative to the propulsion head 26, and the inner cylinder 20
is moving forward with respect to the outer cylinder 18. In this state, the rotation source 104 and the jack 110 are operated. In this case, since the propulsion head 26 is pushed by the outer cylinder 18, it moves forward with its central axis aligned with the outer cylinder 18.

During this excavation, the operator uses the transit 134 to ensure that the center 140 of the propulsion position indicator 44 is aligned with the telescope 1.
36 with respect to the plan reference line 138 is continuously or intermittently monitored.

If the center 140 deviates from the planning reference line 138, its direction is confirmed as described above, the direction of rotation of the propulsion head 26 relative to the outer cylinder 18 is confirmed as described above, and then the cylinder 11 of the reciprocating motion source 102 is
4 through the opening 122 to supply the high pressure fluid to the shaft 118.
By moving the cutter head 24 backward with respect to the pressing body 108, the display is positioned in the opposite direction to the direction of deviation of the center 140 with respect to the planning reference line 138, with the teeth 58 of the cutter head 24 and the gear 62 of the propulsion head 26 interlocking. The propulsion head 26 is rotated relative to the outer cylinder 18 by the rotation source 104 until the light is lit, and then the cylinder 11 of the reciprocating source 102 is rotated in this state.
4 from the opening 124 to disengage the teeth 58 and the gear 72, and supply the high pressure fluid to the moving means 28 to push the propulsion head 26 by the inner cylinder 20, and the rotation source 104 and the jack 110 are put it into operation.

As a result, the excavator 12 moves forward with the propulsion head 26 inclined with respect to the outer cylinder 18. Thereafter, the supply of high pressure fluid to the moving means 28 is stopped when the center 140 coincides with the planning reference line 138,
The rotation source 104 and the jack 110 may be operated in this state.

When correcting the excavation direction, if the center 140 of the propulsion position indicator 44 is shifted downward with respect to the planning reference line 138 as shown in FIG. 12B, the above-mentioned indicator light in FIG. The propulsion head 26 may be rotated with respect to the outer cylinder 18 so that the indicator light located in the direction of the shift, that is, the indicator light 144b located at the lowest end lights up.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an excavator used in the burying device of the present invention, FIG. 2 is a longitudinal sectional view showing an embodiment of a pipe to be buried and an intermediate earth and sand discharge mechanism, and FIG. The figure is a sectional view showing an example of an excavator.
Figure 4 is a cross-sectional view taken along the - line in Figure 1;
5 is a left side view of FIG. 2, FIG. 6 is a left side view of FIG. 1, FIG. 7 is a sectional view taken along the - line of FIG. 9 is a sectional view taken along the - line of FIG. 1, and FIG. 10 is a sectional view showing the tip of the excavator to explain the operation of the excavator. 11 is a left side view of FIG. 3, and FIG. 12 is an explanatory diagram of a method for correcting the excavation direction. DESCRIPTION OF SYMBOLS 10... Burying device, 12... Excavator, 14... Propulsion machine, 16... Pipe, 18... Outer cylinder, 20... Inner cylinder, 2
2... Sediment discharge mechanism, 24... Cut head, 26...
Propulsion head, 28... Moving means, 32... Spherical bearing, 34... Cover, 36... Screw conveyor,
38... Rotating shaft, 40... Vane, 42... Hole, 44... Propulsion position indicator, 50, 52... Connecting part, 58... Teeth,
60... recess, 62... gear, 64, 68... pressing surface,
66...first surface, 70...second surface, 72...rotation direction indicator, 76...sensor, 78...detection object, 86
... recess, 88... cylinder part, 90... piston part,
92...High pressure hose, 100...Propulsion means, 102...
Reciprocating motion source, 104... Rotation source, 106... Base, 1
08... Pressing body, 110... Jacket.

Claims (1)

[Scope of Claims] 1. A pipe burying device comprising an excavator and a propulsion device for advancing the excavator, wherein the excavator has a connecting portion at its rear end for connecting a pipe to be buried. an outer cylinder, an inner cylinder arranged movably in the axial direction inside the distal end of the outer cylinder and protruding forward from the outer cylinder, and an inner cylinder arranged rotatably through the inner cylinder and the outer cylinder. a dirt discharge mechanism having a screw conveyor, a cutter head attached to the tip of the screw conveyor, and a propulsion head surrounding the cutter head and rotatably supported outside the tip of the outer cylinder and the inner cylinder. and a first contacting the pressing surface at the tip of the outer cylinder during propulsion.
a propulsion head having a second surface in contact with a surface of the inner cylinder and a pressing surface at the tip of the inner cylinder, a moving means for moving the inner cylinder in the axial direction thereof with respect to the outer cylinder, the inner cylinder and the propulsion head; a spherical bearing disposed between the cutter head and teeth provided on the rear surface of the cutter head;
The propulsion head includes a gear that faces the teeth and can engage with the teeth, and the propulsion device includes a rotation source that rotates the screw conveyor and a gear that rotates the screw conveyor between the outer cylinder and the inner cylinder. a reciprocating motion source that causes the teeth and gears to engage with each other by retreating with respect to the cylinder, and a propulsion means that advances the earth and sand discharge mechanism and the outer cylinder, the pressing surface of the inner cylinder and the second part of the propulsion head. The pipe embedding device is non-parallel to the plane when the central axes of the inner cylinder and the propulsion head are aligned. 2. The moving means includes a cylinder part having a recess formed in the circumferential direction on the inner surface of the tip end of the outer cylinder, and a piston part provided on the outer periphery of the inner cylinder and movable in the axial direction within the recess. , and means for supplying high pressure fluid to the recess to advance the piston portion. 3. The propulsion head has a rotational direction indicator extending rearward from the inner cylinder between the inner cylinder and the earth and sand discharge mechanism, and a detection object provided at the rear end of the indicator; The buried device according to claim 1 or 2, further comprising a plurality of sensors spaced apart in the circumferential direction inside the device for sensing the detection object and outputting an electric signal. 4. The earth and sand discharge mechanism includes a cover surrounding the screw conveyor and extending in the axial direction of the outer cylinder, and the screw conveyor has a rotating shaft and a blade extending spirally around the rotating shaft, The shaft has a hole extending from its rear end along its central axis, and has a propulsion position indicator at the end of the hole that indicates the center position in the propulsion direction. Device.