JP2002349183A - Direction correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a direction correcting device capable of further improving the accuracy of direction control by allowing the efficient dividing or connecting work of the direction correcting device from the divided or connected state from and to the front part of a front edge device even in a narrow shaft, and allowing the device located in the rear of the front part of the front edge device to follow it in a direction control using a double propelling mechanism. SOLUTION: This direction correcting device comprises required pairs of hydraulic jacks 26 for radially pressing an inner cylinder 17 so as to correct the propelling direction of the front part of the front edge device moving forward in the ground. A communicating position for allowing the ports of the paired hydraulic jacks 26 to communicate with each other is additionally formed in the solenoid control valve 34 of a hydraulic circuit 61.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direction correcting device for correcting the direction of propulsion when propelling underground with a tip device in order to construct tunnels such as horizontal holes and vertical holes in the ground.

[0002]

2. Description of the Related Art As a method of burying a pipe in the ground, a static press-in method in which a tip device is simply pressed by a main pushing device installed in a shaft, and soil and sand are pressed into the ground without excavation, An excavation method for excavating earth and sand with an excavator as a tip device and propelling the excavator in the ground while discharging the excavated earth and sand, a construction method disclosed in Japanese Patent Application Laid-Open No. 60-148997, and FIG. As shown in FIG. 11, the exciter a is actuated to excite the front part c of the vibration generator b as a tip device, and at the same time, to vibrate the soil d around the vibration generator b to fluidize. There is a dynamic press-in method in which the vibration generator b is press-fitted without excavating earth and sand by being pressed by a main pressing device f installed in a shaft e.

In the above methods, when there is an obstacle such as a buried object in the ground, it is necessary to correct the propulsion direction of the tip device. There is an apparatus disclosed in Japanese Patent Publication No. 58-222291. As shown in FIG. 12 of the present application, the device disclosed in Japanese Patent Application Laid-Open No. 58-222291 is a passive wedge through a driving wedge member h by a positioning jack g extending in parallel with the propulsion direction of the device as a booster mechanism. The wedge surface of the member i is pushed, and the piercing head j and the propulsion jack k in front of the passive wedge member i are inclined via the ball bearing m to change the propulsion direction of the device to avoid obstacles.

[0004]

However, the device for correcting the propulsion direction of the tip device so as to avoid obstacles as described above is provided with a positioning jack g for pushing the wedge surface of the passive wedge member i via the driving wedge member h. Since the stroke becomes longer in the propulsion direction, the total length of the device in the propulsion direction becomes longer, which makes it difficult to carry the device into the shaft, which is a starting point, and has poor controllability for controlling the direction of the device.

In order to solve such a problem, the present inventors have invented a direction correcting device as described below and have already filed an application.

FIGS. 4 to 9 show an example of a direction correcting device invented by the present inventors.

FIG. 9 shows a pipe burying device to which the above-mentioned direction correcting device is applied. In the figure, reference numeral 1 denotes a tip device.

The tip device 1 is connected to a front portion 4 located forward of the propulsion direction D1 and to the rear of the front portion 4 of the tip device 1 in the propulsion direction D1 and to correct the propulsion direction D1 during propulsion. A direction correcting device 6 having a bent portion 5 is provided, 7 is an insertion tube disposed behind the direction correcting device 6 in the propulsion direction D1 in the tip device 1, 8 is disposed in a shaft 9 and a pressing plate 10 is provided. This is a main pushing device such as a hydraulic jack which presses the rear end of the insertion tube 7 through the main body.

In the pipe burying apparatus described above, the original pushing device 8 is extended, the insertion tube 7 is pressed into the ground via the pressing plate 10, and the tip device 1 is pressed by the insertion tube 7. The device 1 is propelled.

In the pipe burying device, the front portion 4 of the tip device 1 is tilted by the bent portion 5 of the direction correcting device 6, and the original pressing device 8 is further extended, so that the pressing device 10 is inserted through the pressing plate 10 and the insertion tube 7. The tip device 1 is pressed, and the propulsion direction D1 of the tip device 1
Is being promoted while changing.

Details of such a direction correcting device 6 are shown in FIGS.
As shown in FIG. 7, the direction correcting device 6 includes a direction correcting unit 11 having the bending portion 5 including a front-stage cylindrical portion 12 of a front stage and a rear-stage cylindrical portion 13 of a rear stage.

The front-stage cylindrical portion 12 has a front wall 15 disposed on a front portion 4 of the tip device 1 via a detachable connection portion 14. The front wall 15 is located behind the front wall 15 in the propulsion direction D 1. 4, a first outer cylinder 16 having substantially the same diameter as the first outer cylinder 1;
6 and a cylindrical inner cylinder 17 that is formed concentrically and projects rearward in the propulsion direction D1. The shaft of the inner cylinder 17 is provided near the front wall 15 of the inner cylinder 17. A convex spherical seat 18 having a center on the line is formed, and a solid lubricating film 19 of carbon or the like is formed on the surface of the convex spherical seat 18.

The rear cylinder 13 located behind the front cylinder 12 in the propulsion direction D1 includes a second outer cylinder 20 having substantially the same diameter as the first outer cylinder 16 of the front cylinder 12. Is located between the first outer cylinder 16 and the inner cylinder 17 of the front-stage cylindrical portion 12 and has a convex spherical seat 18 in the propulsion direction D.
1 is formed on the inner peripheral surface of the concave spherical seat 21 which is in contact with the convex spherical seat 18 and has a solid lubricating film 22 made of carbon or the like similar to that of the convex spherical seat 18. Are formed on the outer peripheral surface of the concave spherical seat 21, and a plurality of annular grooves 23 (two in FIG. 4) are provided.
A U-shaped packing 24 for preventing earth and sand from flowing into the inside from a gap between the first outer cylinder 16 of the front cylinder portion 12 and the concave spherical seat 21 of the rear cylinder portion 13 is fitted.

Further, on the outer peripheral surface of the concave spherical seat 21, behind the annular groove 23 in the propulsion direction D1, the front cylinder portion 12 is tilted after the propulsion direction D1 in the first outer cylinder 16 when the front cylinder portion 12 tilts. A groove 25 having a predetermined size is formed so that the end does not contact the outer peripheral surface of the concave spherical seat 21.

Behind the protruding direction D1 of the concave spherical seat 21 in the second outer cylinder 20 of the rear cylindrical portion 13, the center of rotation of the convex spherical seat 18 in the inner cylinder 17, as shown in FIGS. And four hydraulic jacks 26 are disposed so as to be located farthest to the rear in the propulsion direction D1, that is, at the rear end of the inner cylinder 17 in the propulsion direction D1.
Surrounds the inner cylinder 17 at equal intervals in the circumferential direction, and
Are arranged as a pair.

Here, the structure of the outer peripheral surface of the inner cylinder 17 and the hydraulic jack 26 will be described. As shown in FIG.
A plurality of flat surfaces (four places in FIG. 6) extending in the tangential direction are formed on the outer peripheral surface of each of the sliding bearing plates 27, and the sliding bearing plates 27 are disposed on the sliding bearing plates 27. The front end of the hydraulic jack 26, which can be swung, is brought into surface contact.

Between the two hydraulic jacks 26 among the plurality of hydraulic jacks 26 in the second outer cylinder 20 of the rear-stage cylindrical portion 13, two stroke detectors extending in the radial direction of the inner cylinder 17 are provided. 29 are arranged at a substantially right angle with the phase shifted in the circumferential direction of the inner cylinder 17, and between the remaining two hydraulic jacks 26, two radially extending in the inner cylinder 17 in the same manner as the stroke detector 29. The earth pressure detectors 30 are arranged at substantially right angles with their phases shifted in the circumferential direction of the inner cylinder 17.

On the other hand, as shown in FIGS. 4 and 5, the rear end of the rear-stage cylindrical portion 13 in the propulsion direction D1, that is, the rear end of the direction correcting portion 11 in the propulsion direction D1, is provided with the second outer portion of the rear-stage cylindrical portion 13. Cylinder 2
A hollow rear tubular portion 32 formed concentrically with the outer diameter and having substantially the same outer diameter and having a lid 31 attached to the rear end of the propulsion direction D1 is connected to the inside of the hollow portion of the rear tubular portion 32. Various devices forming a hydraulic circuit and various devices forming a control system necessary for tilting the front-stage cylindrical portion 12 of the direction correcting section 11 are accommodated therein.

The equipment housed in the rear tubular portion 32 is an electromagnetic control valve 34 which is a three-position switching valve constituting a hydraulic circuit, a pressure sensor 35 corresponding to each hydraulic jack 26,
A lubricant supply nozzle 3 formed on the circumferential surface of the rear tubular portion 32 so as to supply a lubricant such as bentonite into the underground soil.
6. An amplifier for the stroke detector 29 in the control system, a gyro 37 for controlling the propulsion direction D1, an electromagnetic coil 38 for detecting the position on the ground by a generated magnetic field, a battery 39 for supplying power to each member, a wiring-saving unit, and the like. is there. Also, two pairs of hydraulic jacks 26 each composed of two pieces are provided.
Is a conduit 40 extending rearward in the propulsion direction D1 of the tip device 1.
7 are connected to the respective electromagnetic control valves 34 corresponding to the respective pairs, and pipes 41 and 42 in FIG.
And the feed pipe 47 and the return pipe 48 are connected to the couplers 43 and 44 attached to the lid 31 and connectable to the hydraulic unit 60, and to the hydraulic system of the vibration generator. Connectable couplers 45 and 46 are connected.

A tip of a pipe 49 is connected to the lubricating material supply nozzle 36, and the pipe 49 extends rearward through the hollow portion of the rear tubular portion 32, and is connected to the coupler 50 attached to the lid 31. It is connected to the. Further, a branch portion (not shown) is provided at an intermediate position of the pipeline 49, and the pipeline 5 extending forward from the branch portion through the hollow portion of the rear tubular portion 32.
2 is connected to a coupler 51 which can be attached to and detached from the hydraulic system of the front part 4 of the tip device 1.

In FIG. 5, reference numeral 53 denotes a key-shaped detent member projecting from the rear end of the first outer cylinder 16 of the front-stage cylindrical portion 12 in the propulsion direction D1. It engages with a notched guide means 54 provided at the tip of the second outer cylinder 20 of the second cylinder 20 in the propulsion direction D1 of the second cylinder 13, so that the first cylinder 12 does not rotate in the circumferential direction during propulsion. The movement is regulated.

On the other hand, FIG. 7 shows a hydraulic circuit for changing the direction of the front cylindrical portion 12, that is, the propulsion direction D1 of the tip device 1 by the hydraulic jack 26, wherein 60 is a hydraulic unit, and 61 is a tilting unit. It is a hydraulic circuit.

The hydraulic unit 60 is installed on the ground, and on the discharge side of a hydraulic pump 63 driven by an electric motor 62, a check valve 64 and a check valve 6 with a variable throttle are provided in the middle.
5 is connected to a pipeline 67 provided with a coupler 66 at the downstream end in the oil flow direction D2. The hydraulic unit 6
0 is provided with a return line 70 connected to the coupler 68 at the upstream end in the oil flow direction D2 and returning the oil to the tank 69, and the hydraulic pump 63 is provided with a suction line 71 for sucking oil from the tank 69. Is connected.

On the downstream side of the check valve 64 in the oil flow direction D2 in the pipe line 67, a switching valve 72 is connected in the middle, and the other end of the pipe line 73 whose one end is connected to the return line 70 is connected. It is connected. Line 67 of hydraulic unit 60 and return line 7
A relief valve 74 for returning oil to the pipeline 70 when the pressure on the pipeline 67 exceeds a set value is provided in the middle of the pipeline connecting to zero.

The components constituting the hydraulic circuit 61 are housed in the rear tubular portion 32, and the coupler 43, which can be connected to the coupler 66 of the hydraulic unit 60 through the conduit 75, has a tip device. 1 a feed line 4 leading to a coupler 45 connectable to a hydraulic unit (not shown) at the front 4
7 is connected, and the coupler 6 of the hydraulic unit 60 is connected.
8 which can be connected to the line 8 via a line 76
4 is connected to a return line 48 leading to a coupler 46 connectable to a hydraulic unit (not shown) in the front part 4 of the tip device 1.

A line 41 connected to the two electromagnetic control valves 34 is connected to a middle part of the feed line 47, and a middle part of the return line 48 is connected to the two electromagnetic control valves 34. The pipes 42 to be connected are collectively connected to a single pipe 77, and a relief valve 78 as a first valve is provided in the single integrated pipe 77.

On the other hand, the electromagnetic control valve 34 is connected to a pipe 40 communicating with the head side liquid chamber 79 of each hydraulic jack 26 and has a check valve 80 with a variable throttle in the middle thereof.
Is connected, and the check valve 80 with a variable throttle controls the flow rate of oil returning from the head-side liquid chamber 79 of the hydraulic jack 26.

A pipe 83 provided with a check valve 82 is branched and connected in the middle from the connection position of the pipe 81 to the pipe 40 to the check valve 80 with a variable throttle.
Are combined into one pipe 84 and connected to the return pipe 48 via a relief valve 85 as a second valve.

Here, when the predetermined hydraulic jack 26 presses the inner cylinder 17 and the opposing hydraulic jack 26 is pressed by the inner cylinder 17, the relief valve 78 is set on the opposite return side. A predetermined pressure is set so that the pressure in a series of flow paths of the head side liquid chamber 79, the pipe 40, the pipe 81, the electromagnetic control valve 34, and the pipe 42 of the hydraulic jack 26 does not become zero.

FIG. 8 shows a control device for tilting the front cylindrical portion 12 through the hydraulic jacks 26. The control device includes a hydraulic pressure which is a thrust of each hydraulic jack 26 detected by the pressure sensor 35. Jack pressure P1, inner cylinder 17 detected by stroke detector 29, displacement direction X1 of front cylinder 12 and rear cylinder 1 detected by earth pressure detector 30
The earth pressure P2 acting on the second outer cylinder 20 of No. 3 can be given as a detection signal to the arithmetic and control unit 91 of the control device 90 installed on the ground.

Selection Sa of the hydraulic jack 26 when the front-stage cylindrical portion 12 is tilted, and the extension amount L of the hydraulic jack 26
“a” can be set in the arithmetic control unit 91 of the control device 90 by a host system control device 92 such as a CPU or an operator, and other operation commands C1 can also be given to the arithmetic control unit 91 of the control device 90. It has become. Further, the operation control section 91 of the control device 90 can supply the operation state information I to the higher-level control device 92.

Further, a switching command V can be given to the electromagnetic control valve 34 from the arithmetic control unit 91 in the control device 90 based on various data given from the host system control device 92 and the like. In FIG. 8, reference numeral 93 denotes a display unit for displaying operation state data from the arithmetic control unit 91 in the control device 90.

Next, the operation of the direction correcting device 6 will be described.

When the direction of the tip device 1 is changed,
When the set pressure of the relief valve 78 is PO1 and the set pressure of the relief valve 85 is PO2, the relief valve 78 and the relief valve 85 of the hydraulic circuit 61 shown in FIG.
The pressure is adjusted so that the hydraulic unit 60
Then, the hydraulic pump 63 is driven by the electric motor 62 in a state where the switching valve 72 is switched so that the oil flows, and the oil discharged from the hydraulic pump 63 passes through the pipelines 67 and 73, the switching valve 72, and the return pipe. It circulates through a passage 70 to a tank 69.

Further, from the upper system control device 92, the advanced device 1
That is, signals such as the selection Sa of the hydraulic jack 26 corresponding to the displacement direction and the displacement amount of the front-stage cylindrical portion 12, the extension amount La of the hydraulic jack 26, and other operation commands C <b> 1 are given to the arithmetic and control unit 91 of the control device 90. Have been. For this reason, by turning on the operation button for starting the change of the propulsion direction D1, a switching command is given to the switching valve 72 of the hydraulic unit 60 from the arithmetic control unit 91 of the control device 90, and the oil in the pipeline 73 is discharged. Switching is performed so as not to pass through the switching valve 72, and at the same time, a switching command is given to at least one of the two electromagnetic control valves 34 of the hydraulic circuit 61, and one of the pair of hydraulic jacks 26 is fed through the pipeline 81. Either connect the supply-side conduit 41 and connect the other conduit 81 to the return-side conduit 42, or connect the other conduit 81 to the supply-side conduit 41 and connect the one conduit 81 To the return line 42,
The switching of the electromagnetic control valve 34 is performed.

For this reason, in one of the two electromagnetic control valves 34, the pair of hydraulic jacks 26
The switching is performed such that one pipeline 81 connected to the head-side liquid chamber 79 is connected to the pipeline 41 on the supply side, and the other pipeline 81 is connected to the pipeline 42 on the return side. In this case, the oil discharged from the hydraulic pump 63 is supplied to the pipelines 67 and 7.
5, 47, 41, through the electromagnetic control valve 34,
Through the pipe 40 from the head side liquid chamber 7 of the hydraulic jack 26.
9 and presses the inner cylinder 17 by extending the hydraulic jack 26. At the same time, the oil in the head side liquid chamber 79 of the hydraulic jack 26 is discharged, and the other pipelines 40 and 81 are discharged. Through the electromagnetic control valve 34, from the pipe 42 via the pipe 77 and the relief valve 78 to the return pipe 4
8. It is returned to the tank 69 through the pipes 76 and 70.

In one electromagnetic control valve 34 of the two electromagnetic control valves 34, the other conduit 81 connected to the head-side liquid chamber 79 of the pair of hydraulic jacks 26 is connected to the supply-side conduit 41. And when one of the pipes 81 is connected to the return pipe 42, the oil discharged from the hydraulic pump 63 is supplied to the pipes 67, 75, 4.
7 and 41, through the electromagnetic control valve 34, and from the other line 81 in the above case through the line 40 to the hydraulic jack 2 on the opposite side.
6, the inner cylinder 17 is pressed in the opposite direction by extending the hydraulic jack 26 on the opposite side, and at the same time, the inner cylinder 17 of the head hydraulic chamber 79 of the opposing hydraulic jack 26 is opened. The oil is drained and one line 4 in the above case
After passing through the electromagnetic control valve 34 through 0, 81, the pipe 42 is returned to the tank 69 through the return pipe 48, the pipes 76, 70 through the pipe 77 and the relief valve 78, and then to the tank 69.

Further, the other electromagnetic control valve 34 of the two electromagnetic control valves 34 has another pair of hydraulic jacks 26.
Operates when the two electromagnetic control valves 34 are operated at the same time. When two electromagnetic control valves 34 are simultaneously operated, two pairs of liquids arranged in directions orthogonal to each other are operated. The pressure jacks 26 expand and contract in the required directions, and the pressing direction of the inner cylinder 17 at this time matches the extension direction of the two pairs of hydraulic jacks 26.

Here, the tilt angle of the inner cylinder 17 is detected by two stroke detectors 29 arranged at a substantially right angle with the phase shifted in the circumferential direction of the inner cylinder 17, and the tilt data is detected. It is obtained by calculating the value.

When the predetermined hydraulic jack 26 is extended by a predetermined amount, the hydraulic jack 26 is
The inner cylinder 17 is pressed in the radial direction, and the front cylindrical portion 12 is tilted by a predetermined amount of displacement about the spherical center of the convex spherical seat 18 as a rotation center, and the front portion 4 of the tip device 1 is directed in a desired direction.

Subsequently, when the propulsion direction D1 of the tip device 1 is further changed, the hydraulic jack pressure P1 by the pressure sensor 35, and the displacement direction X1 of the front-stage cylindrical portion 12 by the stroke detector 29 are further changed. , The earth pressure P2 acting on the outer peripheral surface of the rear-stage cylindrical portion 13 is detected by the earth pressure detector 30 and given to the arithmetic and control unit 91 in the control device 90.
Thus, the electromagnetic control valve 34 is controlled to an appropriate state.

For this reason, the control device 90 transmits the selection Sa of the hydraulic jack 26, the extension La of the hydraulic jack 26, and other operation commands C1 corresponding to the displacement direction and the displacement amount of the front cylindrical portion 12 at the time of tilting. The tilt can be set arbitrarily and the tilt can be performed by controlling the tilt direction of the pre-stage cylindrical portion 12 to a predetermined state based on the above-described detection data.

On the other hand, when the tip device 1 is pressed by the main pushing device 8 shown in FIG. 9 to form a tunnel, the thrust applied to the tip device 1, the force applied in the radial direction of the tip device 1, and the like are converted into a convex spherical shape. It is received by the concave spherical seat 21 of the rear cylindrical portion 13 via the seat 18.

Accordingly, the stroke of the hydraulic jack 26 required for tilting the front cylinder 12 is set not in the propulsion direction D1 of the front device 1 but in the radial direction of the inner cylinder 17 of the front cylinder 12. The total length of the propulsion direction D1 can be shortened,
As a result, it is easy to carry into the shaft 9 serving as a starting point, and the controllability for controlling the direction of the tip device 1 can be improved. Further, since the thrust given to the tip device 1 is supported by the convex spherical seat 18, the hydraulic jack 26 can be reduced in size, the occupation of the installation space can be reduced, and the space inside the direction correcting device 6 can be effectively used.

In the hydraulic circuit 61, the liquid discharged from the contracting hydraulic jack 26 is maintained at a predetermined pressure or higher by the relief valve 78, so that the inner cylinder 17 of the bent portion 5 where the tip device 1 bends and the liquid. Even if any external force is applied to the pressure jack 26, the malfunction of the hydraulic jack 26 is prevented, and the inner cylinder 17 and the hydraulic jack 26 are always in contact, and as a result, the bent portion 5 and the tilt It is possible to completely suppress a gap generated between the inner cylinder 17 and the hydraulic jack 26, which adversely affects the controllability of the direction.

In addition, since a plurality of pairs of hydraulic jacks 26 are provided in the circumferential direction of the inner cylinder 17, a plurality of pairs of hydraulic jacks 2 are provided.
The inner cylinder 17 can be tilted in various directions according to the direction in which the inner cylinder 6 extends.

The head-side liquid chamber 79 of the hydraulic jack 26 is also provided.
Since the check valve 80 with the variable throttle is provided in the pipe line 81 connecting the electromagnetic control valve 34 and the electromagnetic control valve 34, the flow rate of the oil returning from the head side liquid chamber 79 of the hydraulic jack 26 is controlled, and the tilt by the hydraulic jack 26 is controlled. The operating speed can be adjusted.

Further, when an abnormal liquid pressure is generated in the lines 40 and 81 connecting the head side liquid chamber 79 of the hydraulic jack 26 and the electromagnetic control valve 34, the line 84 having a relief valve 85 is used. The relief valve 7 is connected to the lines 40 and 81 connecting the head side liquid chamber 79 of the hydraulic jack 26 and the electromagnetic control valve 34.
Since the hydraulic pressure is released to the return line 48 downstream of the direction 8, the direction correcting device 6 can be used reliably and safely.

As described above, the direction correcting device 6 which the present inventors have already invented and filed is small in size and has good durability and operability.

The tip device 1 is generally divided at the connection between the front portion 4 and the direction correcting device 6 due to space restrictions of the shaft 9 on the starting side and the arrival side. In the direction correcting device 6 as described above, the hydraulic circuit 6
As one electromagnetic control valve 34, oil from a hydraulic pump 63 is supplied to one of the hydraulic jacks 26 of the pair as a three-position switching valve, that is, one of the hydraulic jacks 26 so as to press the inner cylinder 17 in the radial direction. A push position for returning the oil pressed by the inner cylinder 17 and discharged from the other hydraulic jack 26 to the tank 69, a lock position for sealing a pair of ports of the hydraulic jack 26, and a pair of hydraulic jacks The oil from the hydraulic pump 63 is supplied to the other hydraulic jack 26 among the hydraulic jacks 26 so as to press the inner cylinder 17 in the radial direction.
Since the switching valve has a pulling position for returning the oil discharged from one hydraulic jack 26 by the pressure of the hydraulic jack 26 to the tank 69, the front part 4 of the tip device 1 and the direction correcting device 6 are divided. Work to connect in the shaft 9 from the state,
When performing the work of dividing the state where the front part 4 of the tip device 1 and the direction correcting device 6 are connected in the shaft 9, the hydraulic pump 6
In the 3 stop state, even if the electromagnetic control valve 34 of the hydraulic circuit 61 is switched to any one of the push position, the lock position, and the pull position, the paired hydraulic jacks 26 are in a free state without being locked. It is not possible.

However, as described above, the work of connecting the front part 4 of the tip device 1 and the direction correction device 6 from the divided state in the shaft 9 and the connection of the front part 4 of the tip device 1 and the direction correction device 6 are performed. When performing the work of dividing in the shaft 9 from the connected state, if the paired hydraulic jacks 26 cannot be made free without being locked, the front part 4 of the tip device 1 and the direction correcting device cannot be set. It becomes difficult to adjust the posture angle with 6,
Workability in the shaft 9 was sometimes deteriorated.

The present inventors mount a mechanism (so-called double propulsion mechanism) that expands and contracts in the propulsion direction D 1 on the front part 4 of the tip device 1, and uses the direction correcting device 6 to center the tip device 1 at the bending portion 5. In the folded state, the front part 4 of the tip device 1 is extended by the double propulsion mechanism and propelled by a required amount, and then the double propulsion mechanism is set in a free state or the original pushing device is contracted while the double propulsion mechanism is contracted. 8, the tip device 1 is pressed through the pressing plate 10 and the insertion tube 7 to be propelled while changing the propulsion direction D1 of the tip device 1, thereby improving the directional control accuracy regardless of the soil. The direction control using the so-called double propulsion mechanism is also under development. In this case, after the front part 4 of the tip device 1 is extended by the double propulsion mechanism and propelled by a required amount, the double propulsion mechanism is started. Or free When the main pushing device 8 is extended while the double propulsion mechanism is contracted, it is better to make the direction correcting device 6 located behind the front portion 4 of the tip device 1 follow the direction control device, thereby improving the direction control accuracy. It has been confirmed that there is a case where it is advantageous in making the front end 4 of the tip device 1 in a state where the hydraulic jacks 26 forming a pair are locked and the bent portion 5 is fixed as described above. However, it is difficult to follow the direction correcting device 6 located behind, and it has been difficult to further improve the direction control accuracy.

According to the present invention, in view of the above-mentioned circumstances, the division or connection of the front portion of the tip device and the direction correcting device from the connection state or the connection operation can be efficiently performed even in a narrow shaft, while the double propulsion mechanism is provided. When performing directional control using
An object of the present invention is to provide a direction correcting device that can follow a front portion of a tip device with a direction correcting device positioned behind the front device and can further improve direction control accuracy.

[0054]

SUMMARY OF THE INVENTION The present invention comprises a convex spherical seat disposed in a first outer cylinder forming part of a tip device for propelling underground, and a second spherical member provided in a second outer cylinder. And a concave spherical seat externally fitted to the convex spherical seat, and by pressing an inner cylinder connected to the convex spherical seat in the radial direction, the propulsion direction of the front part of the tip device through the convex spherical seat is changed. In a direction correcting device having a required pair of hydraulic jacks disposed in the second outer cylinder so as to correct, the inner cylinder is radially moved to one of the hydraulic jacks forming a pair. The push position for feeding the liquid from the hydraulic pump so as to press and returning the liquid discharged from the other hydraulic jack pressed by the inner cylinder to the tank, and the port of the hydraulic jack forming a pair are sealed. Lock position and the other hydraulic jack of the pair of hydraulic jacks A pulling position for feeding the liquid from the hydraulic pump so as to press the cylinder in the radial direction and returning the liquid discharged from one hydraulic jack pressed by the inner cylinder to the tank, and a pair of hydraulic jacks. A direction correcting device comprising a switching valve having a communication position for communicating a port.

According to the above means, the following effects can be obtained.

As described above, if the switching valve is formed with a communication position for communicating the port of the hydraulic jack that forms a pair, the front portion of the tip device and the direction correcting device are connected in the shaft in a divided state. When switching from a connected position to a communicating position instead of a lock position, the hydraulic jacks that are paired with each other should It becomes possible to be in a free state without locking, and it becomes easy to adjust the posture angle between the front part of the tip device and the direction correcting device, and the workability in the shaft is improved.

After the front part of the tip device is extended by the double propulsion mechanism and propelled by a required amount, the double propulsion mechanism is set in a free state, or the main pushing device is extended while the double propulsion mechanism is contracted. In the case where the tip device is propelled, the switching valve of the hydraulic circuit is switched to the communication position instead of the lock position in the same manner as described above, and the paired hydraulic jacks are set in a free state without being locked. The front part of the tip device can be made to follow the direction correcting device located behind it, which is advantageous in further improving the direction control accuracy.

[0058]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an embodiment of the present invention. In the figure, portions denoted by the same reference numerals as those in FIGS. 4 to 9 represent the same components, and the basic configuration is shown in FIGS. 9 is the same as that shown in FIG. 9, but the feature of the illustrated example is that, as shown in FIG. 1, the inner cylinder 17 is radially attached to one of the hydraulic jacks 26 forming a pair. A push position for feeding oil from the hydraulic pump 63 so as to press and returning the oil pressed by the inner cylinder 17 and discharged from the other hydraulic jack 26 to the tank 69; and a port of the hydraulic jack 26 forming a pair. The oil is supplied from the hydraulic pump 63 so as to press the inner cylinder 17 in the radial direction to the other hydraulic jack 26 of the pair of hydraulic jacks 26 and is pressed by the inner cylinder 17. From one hydraulic jack 26 The electromagnetic control valve 34 having a pulling position for returning the discharged oil to the tank 69 is additionally provided with a communication position for communicating the port of the hydraulic jack 26 forming a pair, and the electromagnetic control valve 34 is changed to a four-position switching valve. It is in the point which was.

Next, the operation of the illustrated example will be described.

As described above, the electromagnetic control valve 3 of the hydraulic circuit 61
4 is provided with a communication position for communicating the ports of the hydraulic jacks 26 forming a pair with each other, so that the front part 4 of the tip device 1 and the direction correcting device 6 can be connected in the shaft 9 from a divided state. When the operation of dividing the front part 4 of the tip device 1 and the direction correcting device 6 from the connected state in the shaft 9 is performed, the electromagnetic control valve 34 of the hydraulic circuit 61 is switched to the communication position instead of the lock position. It is possible to make the pair of hydraulic jacks 26 free without locking, and the front part 4 of the tip device 1 and the direction correcting device 6
And the workability in the shaft 9 is improved.

The front part 4 of the tip device 1 is driven by a double propulsion mechanism.
Is extended and propelled by a required amount, and then the double propulsion mechanism is set in a free state, or the original pushing device 8 is extended while the double propulsion mechanism is contracted, and the tip device 1 is propelled. Similarly to the above, when the electromagnetic control valve 34 of the hydraulic circuit 61 is switched to the communication position instead of the lock position to make the paired hydraulic jacks 26 free without locking, the front end 4 of the tip device 1 On the other hand, it is possible to make the direction correcting device 6 located behind it follow, which is advantageous in further improving the direction control accuracy.

The electromagnetic control valve 34 is additionally formed.
The type of the communication position for connecting the ports of the hydraulic jacks 26 forming a pair can be, for example, as shown in FIG. 2 or FIG.

In this way, the connection or division work of the front part 4 of the tip device 1 and the direction correcting device 6 from the divided or connected state can be performed efficiently even in the narrow shaft 9.
When performing directional control using a double propulsion mechanism, the tip device 1
The direction correcting device 6 located behind the front part 4 can follow the front part 4, and the direction control accuracy can be further improved.

It should be noted that the direction correcting device of the present invention is not limited to the above illustrated example, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[0066]

As described above, according to the direction correcting device of the present invention, the connection or division work of the front part of the tip device and the direction correcting device from the divided or connected state can be efficiently performed even in a narrow shaft. On the other hand, when performing directional control using a double propulsion mechanism, it is possible to cause the direction correcting device located behind the front end device to follow the front end device,
An excellent effect that the direction control accuracy can be further improved can be obtained.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram of an example of an embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram showing a modification of the electromagnetic control valve according to an example of the embodiment of the present invention.

FIG. 3 is a hydraulic circuit diagram illustrating another modification of the electromagnetic control valve according to an example of an embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of an example of a direction correcting device that the present inventors have already invented.

FIG. 5 is a side view of an example of a direction correcting device that the present inventors have already invented.

6 is a view taken in the direction of arrows VI-VI in FIG. 4;

FIG. 7 is a hydraulic circuit diagram applied to the direction correcting device invented by the present inventors.

FIG. 8 is a control system diagram applied to the direction correcting device that the present inventors have already invented.

FIG. 9 is a side view showing an outline of a pipe burying device to which the direction correcting device shown in FIG. 4 is applied.

FIG. 10 is a side view showing an outline of a vibration generator used in a conventional press-fitting method.

11 is a side view showing an outline of a pipe burying device to which the vibration generating device shown in FIG. 10 is applied.

FIG. 12 is a side view showing an outline of a direction correcting device used in a conventional direction correcting method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front-end device 4 Front part 5 Bending part 6 Direction correction device 7 Insertion tube 8 Main pushing device 9 Vertical shaft 16 First outer cylinder 17 Inner cylinder 18 Convex spherical seat 20 Second outer cylinder 21 Concave spherical seat 26 Hydraulic jack 34 electromagnetic control valve (switching valve) 61 hydraulic circuit 63 hydraulic pump (hydraulic pump) 69 tank

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yuichi Miura 3-1-1-15 Toyosu, Koto-ku, Tokyo Ishikawajima-Harima Heavy Industries, Ltd. Tokyo Engineering Center (72) Inventor Minoru Tanaka 2-3-3 Otemachi, Chiyoda-ku, Tokyo No. 1 Nippon Telegraph and Telephone Corporation (72) Inventor Toshihiko Takanashi 2-3-1 Otemachi, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Hidenori Hino Otemachi, Chiyoda-ku, Tokyo Chome 3-1, Nippon Telegraph and Telephone Corporation (72) Inventor Masashi Miyatake 2-3-1 Otemachi, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Kyoichi Miyazaki Chiyoda-ku, Tokyo 2-3-1, Nippon Telegraph and Telephone Corporation F-term (reference) 2D054 AA01 AA02 AC18 AD33 BA19

Claims (1)

[Claims] 1. A convex spherical seat provided in a first outer cylinder forming a part of a tip device for propelling underground, and a convex spherical seat provided on a second outer cylinder and being provided on the convex spherical seat. The concave outer spherical seat and the inner outer cylinder connected to the convex spherical seat are pressed in a radial direction to correct the propulsion direction of the front portion of the distal end device through the convex spherical seat. In a direction correcting device provided with a required pair of hydraulic jacks disposed in a cylinder, a hydraulic pump is provided so as to radially press the inner cylinder against one of the paired hydraulic jacks. A push position for feeding the liquid and returning the liquid discharged from the other hydraulic jack pressed by the inner cylinder to the tank, a lock position for sealing a pair of hydraulic jack ports, and a pair of liquids Press the inner cylinder against the other hydraulic jack in the radial direction. A pulling position for feeding the liquid from the hydraulic pump and returning the liquid discharged from one hydraulic jack pressed by the inner cylinder to the tank, and a communicating position for communicating a pair of hydraulic jack ports. A direction correcting device comprising a switching valve having the following.