JP3363135B2 - Direction correction device - Google Patents

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 changing the propulsion direction when propelling in the ground so as to construct a tunnel such as a horizontal hole or a vertical hole in the ground.

[0002]

2. Description of the Related Art As a construction method for burying a pipe in the ground, a static press-fitting construction method is used in which a tip device is simply pressed by an extruding device installed in a vertical shaft to press it into the ground without excavating earth and sand, An excavation method for excavating earth and sand with an excavator and propelling the excavator in the ground while discharging the excavated earth and sand, the construction method shown in JP-A-60-148997.
As shown in FIGS. 7 and 8 of the present application, the vibration exciter a is operated to vibrate the front part c of the vibration generator b, and the soil d around the vibration generator b is vibrated to be fluidized, There is a dynamic press-fitting construction method in which the vibration generator b is press-fitted without excavating the earth and sand by being pressed by the original pushing device f installed in the vertical shaft e.

Further, in each of the above construction methods, when there is an obstacle such as a buried object in the ground, it is necessary to change the propulsion direction.
A device for correcting the propulsion direction is disclosed in Japanese Patent Laid-Open No. S58-222.
There is a device disclosed in Japanese Patent No. 291. This JP-A-58-22
As shown in FIG. 9 of the present application, the device disclosed in Japanese Patent No. 2291 pushes the wedge surface of the passive wedge member i via the driving wedge member h by a positioning jack g that extends in parallel with the propelling direction of the device as a boosting mechanism. , A drilling head j in front of the passive wedge member i,
The propulsion jack k is tilted via a ball bearing m to change the propulsion direction of the device and avoid obstacles.

[0004]

However, in the device for changing the propulsion direction so as to avoid the obstacle as described above, the stroke of the positioning jack g for pushing the wedge surface of the passive wedge member i through the driving wedge member h is propelled. Since it becomes longer in the direction, the total length in the propulsion direction of the device becomes longer, and it becomes difficult to carry it into the vertical shaft that is the starting point, and the controllability for controlling the direction of the device is poor.

In view of the above situation, the present invention has as its object the provision of a direction correcting device which has a shorter overall length in the propelling direction and which is smaller in size, and which has good durability and operability.

[0006]

A direction correcting device according to claim 1 of the present invention comprises a convex spherical seat housed in a first outer cylinder mounted in a tip device for propelling in the ground; The concave spherical seat provided on the second outer cylinder and fitted on the convex spherical seat, and the inner cylinder connected to the convex spherical seat in the radial direction are pressed by the convex spherical seat to allow In a direction correcting device provided with a required pair of hydraulic jacks arranged in the second outer cylinder so as to correct the propulsion direction of the front portion, one of the pair of hydraulic jacks has a hydraulic jack The liquid is discharged from the hydraulic pump so as to press the cylinder in the radial direction, and the switching valve that presses the inner cylinder to return the liquid discharged from the other hydraulic jack to the tank, and the liquid is discharged. Switch valve and tank to maintain the hydraulic pressure of the hydraulic jack on the It is obtained by a first valve disposed in the return line provided between.

According to a second aspect of the present invention, there is provided a plurality of pairs of hydraulic jacks in the circumferential direction of the inner cylinder.

According to a third aspect of the present invention, in the direction correcting device, a check valve with a variable throttle is provided in a pipe line connecting the head side liquid chamber of the hydraulic jack and the switching valve.

According to the fourth aspect of the present invention, in the direction correcting device, the abnormal hydraulic pressure is released from the pipeline connecting the head side fluid chamber of the hydraulic jack and the switching valve to the return pipeline downstream of the first valve. ,
A pipe having a second valve having a higher set pressure than the first valve is provided.

When the direction of the front portion of the tip device is corrected by the direction correcting device, one of the pair of hydraulic jacks is extended to press the inner cylinder, and the front surface of the tip device is pushed through the convex spherical seat. Correcting the orientation of the tip device by tilting the part.

Here, in order to extend the corresponding hydraulic jack so that the direction of the front portion of the tip device is directed to a desired direction,
By switching the switching valve, the liquid from the hydraulic pump is fed to the corresponding one of the pair of hydraulic jacks to extend it, and at the same time, the other hydraulic jack is
By being pressed by the inner cylinder, the liquid is discharged to the tank and contracted. The liquid discharged from the contracting hydraulic jack is maintained at a predetermined pressure or higher by the first valve.

Since the stroke of the hydraulic jack is set in the radial direction of the inner cylinder, not in the propulsion direction, the overall length of the device can be shortened, and as a result, it can be easily carried into the vertical shaft as a starting point. In addition, the controllability for controlling the direction of the device can be improved.

Further, in the hydraulic circuit, the liquid discharged from the contracting hydraulic jack is held at a predetermined pressure or more by the first valve, so that the inner cylinder of the bent portion where the tip device bends and the hydraulic jack. Even if some external force is applied to the hydraulic jack, the hydraulic jack is prevented from malfunctioning so that the inner cylinder and the hydraulic jack are always in contact with each other, and as a result, the controllability of the bent portion and the tilt direction is adversely affected. The gap between the inner cylinder and the hydraulic jack can be completely suppressed.

According to the second aspect of the present invention, since a plurality of pairs of hydraulic jacks are provided in the circumferential direction of the inner cylinder, the inner cylinders can be arranged in various directions by aligning the extending directions of the plurality of pairs of hydraulic jacks. Can tilt.

Further, according to the third aspect of the present invention, since the check valve with a variable throttle is provided in the pipe line connecting the head side liquid chamber of the hydraulic jack and the switching valve, the head side hydraulic chamber of the hydraulic jack is provided. It is possible to control the flow rate of the liquid returning from the control unit and adjust the operation speed of the tilting operation by the hydraulic jack.

Further, in the case of claim 4 of the present invention, when an abnormal hydraulic pressure is generated in the pipeline connecting the head side fluid chamber of the hydraulic jack and the switching valve, the pipeline having the second valve is used. Since the hydraulic pressure is released from the pipeline connecting the head-side fluid chamber of the hydraulic jack and the switching valve to the return pipeline downstream of the first valve, the device can be used reliably and safely.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are examples of embodiments for carrying out the present invention.

A pipe embedding device to which the direction correcting device of the present invention is applied is shown in FIG. 6, in which 1 is a tip device.

The tip device 1 is connected to the front portion 4 located on the front side of the propulsion direction D1 and behind the front portion 4 of the tip device 1 in the propulsion direction D1 and for correcting the propulsion direction D1 during propulsion. A direction correcting device 6 having a bent portion 5 is provided, and 7 is an insertion tube disposed behind the direction correcting device 6 in the propulsion direction D1 of the tip device 1, and 8 is disposed in a vertical shaft 9 and is provided with a pressing plate 10. It is an extruding device such as a hydraulic jack that presses the rear end of the insertion tube 7 via.

In the pipe embedding device, the extruding device 8 is extended to press the insertion tube 7 into the ground through the pressing plate 10 and the tip device 1 is pressed by the insertion tube 7 so that the distal end is reached. The device 1 is driven.

Further, 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 pushing device 8 is further extended to press the pushing plate 10 and the insertion pipe 7. The tip device 1 is pressed to drive the tip device 1 in the driving direction D1.
I am trying to promote while changing.

Details of such a direction correcting device 6 are shown in FIGS.
As shown in FIG. 4, the direction correcting device 6 includes a direction correcting unit 11 having a bent portion 5 including a front cylindrical portion 12 of a front portion and a rear cylindrical portion 13 of a rear portion.

The front-stage cylindrical portion 12 has a front wall 15 arranged on the front portion 4 of the tip device 1 via a detachable connecting portion 14, and the front portion of the tip device 1 is located behind the front wall 15 in the propelling direction D1. 4, a first outer cylinder 16 formed to have substantially the same diameter as the first outer cylinder 16, and a first outer cylinder 16
And a cylindrical inner cylinder 17 formed concentrically with the inner cylinder 1
7 is longer than the length of the first outer cylinder 16 in the direction parallel to the driving direction D1.

In the vicinity of the front wall 15 of the inner cylinder 17, there is provided a convex spherical seat 18 centered on the axis of the inner cylinder 17, and the surface of the convex spherical seat 18 is made of carbon or the like. Solid lubricant film 19 is formed.

Next, the rear cylindrical portion 13 located behind the front cylindrical portion 12 in the propelling direction D1 is provided with a second outer cylinder 20 having a diameter substantially the same as that of the first outer cylinder 16 of the front cylindrical portion 12. At the tip of the second outer cylinder 20, a convex spherical seat 18 located between the first outer cylinder 16 and the inner cylinder 17 of the front cylindrical portion 12 and having the propulsion direction D is formed.
1 is provided with a concave spherical seat 21 which is widely received, and a solid lubricating coating 2 such as carbon similar to the convex spherical seat 18 is provided on the inner peripheral surface of the concave spherical seat 21 which is in contact with the convex spherical seat 18.
2 and a plurality of annular grooves 2 are provided on the outer peripheral surface of the concave spherical seat 21.
3 (two in FIG. 1) are provided, and the annular groove 23 is designed to prevent U from entering between the first outer cylinder 16 of the front cylindrical portion 12 and the concave spherical seat 21 of the rear cylindrical portion 13 so as to prevent the inflow of earth and sand. A letter-shaped packing 24 is fitted.

An annular groove 23 is formed on the outer peripheral surface of the concave spherical seat 21.
The propulsion direction D1 of the first outer cylinder 16 of the front cylindrical portion 12 when the front cylindrical portion 12 tilts.
1 A groove 25 of a predetermined size is provided so that the rear end thereof does not contact the outer peripheral surface of the concave spherical seat 21.

As shown in FIGS. 1 and 3, behind the concave spherical seat 21 of the second outer cylinder 20 of the rear cylindrical portion 13 in the propelling direction D1, the convex spherical seat 18 of the inner cylinder 17 is propelled from the center of rotation. The position farthest to the rear in the direction D1, that is, the inner cylinder 1
Four hydraulic jacks 26 are provided so as to be located at the rear end of the propulsion direction D1 of 7, and the four hydraulic jacks 26 surround the inner cylinder 17 at equal intervals in the circumferential direction, and Two pieces sandwiching in the direction are configured as a pair.

The structure of the outer peripheral surface of the inner cylinder 17 and the hydraulic jack 26 will now be described. As shown in FIG.
A plurality of flat surfaces (four locations in FIG. 3) extending in the tangential direction are formed on the outer peripheral surface of the sliding bearing plate 27, and the sliding bearing plate 27 is provided with the tip of the hydraulic jack 26. The hydraulic jack 26 is provided with a spherical seat 28 so as to be adjacent to the tip end that makes surface contact.

Then, the second outer cylinder 20 of the rear cylindrical portion 13
Two stroke detectors 29 extending in the radial direction of the inner cylinder 17 are provided between the plurality of hydraulic jacks 26 in FIG.
Are arranged at a substantially right angle after being displaced in the circumferential direction of the inner cylinder 1 between the remaining hydraulic jacks 26, like the stroke detector 29.
Two earth pressure detectors 30 extending in the radial direction of 7 are arranged in the circumferential direction of the inner cylinder 17 so as to be substantially perpendicular to each other.

On the other hand, as shown in FIGS. 1 and 4, the rear cylindrical portion 1
At the rear end of the propulsion direction D1 of 3, that is, at the rear end of the propulsion direction D1 of the direction correcting portion 11, the second outer cylinder 20 of the rear cylindrical portion 13 is provided.
Is connected to a hollow rear cylindrical portion 32, which is concentric and has substantially the same outer diameter, and a lid 31 is attached to the rear end of the driving direction D1. Various models of the hydraulic circuit and various devices of the control system necessary for tilting the front cylindrical portion 12 of the correction unit 11 are housed.

The equipment housed in the rear tubular portion 32 is an electromagnetic control valve 34 which is a three-position switching valve forming a hydraulic circuit, a pressure sensor 35 corresponding to each hydraulic jack 26, bentonite in the soil under the ground, and the like. Lubricant supply nozzle 36 formed on the circumferential surface of the rear cylindrical portion 32 so as to supply the lubricant, the amplifier for the stroke detector 29 in the control system, and the driving direction D
A gyro 37 for controlling 1, a magnetic coil 38 for detecting a position on the ground by a generated magnetic field, a battery 39 for supplying power to each member, a wire-saving unit, and the like. Further, the two pairs of hydraulic jacks 26 each including two are connected to the respective electromagnetic control valves 34 corresponding to each pair via the conduit 40 extending rearward of the propulsion direction D1 of the tip device 1. And the conduits 4 in FIG. 4 to be described later, which are connected to the respective electromagnetic control valves 34.
The rear ends of 1, 42 are connected to a feed pipe line 47 and a return pipe line 48 formed through couplers 43, 44 of the lid 31 and couplers 45, 46 connectable to the vibration generator.

A tip of a pipe line 49 is connected to the lubricant supply nozzle 36, and the pipe line 49 extends rearward through a hollow portion of the rear tubular portion 32 and is connected to a coupler 50 attached to the lid 31. Has been done. Further, a branch portion (not shown) is provided at an intermediate position of the pipe 49, and the rear tubular portion 32 is provided from the branch portion.
The conduit 52 extending through the hollow portion of the front portion to the front side is connected to the coupler 51 that is detachable from the front portion 4 of the tip device 1.

In FIG. 2, reference numeral 53 denotes a key-shaped detent member projecting at the rear end of the first outer cylinder 16 of the front cylindrical portion 12 in the propulsion direction D1. The detent member 53 is a rear cylindrical portion. The guide member 54 of the notch provided at the tip of the second outer cylinder 20 in the propulsion direction D1 of the second outer cylinder 13 causes the front cylindrical portion 1 during propulsion.
2 is guided so as not to rotate in the circumferential direction.

A hydraulic circuit for changing the direction of the front-stage cylindrical portion 12 by the hydraulic jack 26, that is, the propulsion direction D1 of the tip device 1, is shown in FIG. 4, where 60 is a hydraulic unit and 61 is a hydraulic pressure for tilting. Circuit.

The hydraulic unit 60 is installed on the ground, and on the discharge side of the hydraulic pump 63 driven by the electric motor 62, a check valve 64 and a check valve 65 with a variable throttle are provided midway.
And a pipe line 67 to which a coupler 66 is connected at the tip of the oil flow direction D2. Further, the hydraulic unit 60 is provided with a return pipe 70 for connecting the coupler 68 to the rear end of the oil flow direction D2 and for returning the oil to the tank 69, and the hydraulic pump 63 sends the oil sucked from the tank 69. The suction pipe line 71 to be supplied is connected.

Further, on the downstream side of the check valve 64 in the oil flow direction D2 in the conduit 67, the other end of the conduit 73 whose one end is connected to the return valve 70 is connected to the switching valve 72 in the middle. It is connected. 74 of the equipment of the hydraulic unit 60 is a relief valve.

Each device constituting the hydraulic circuit 61 is 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 pipe line 75 has the tip device 1. And a coupler 68 of the hydraulic unit 60 as well as a feed pipe line 47 communicating with a coupler 45 connectable to a hydraulic unit (not shown) of the front portion 4 of the hydraulic unit 60.
And a coupler 44 adapted to be connected via a pipe line 76
Includes a hydraulic unit (not shown) in the front portion 4 of the tip device 1.
A return line 48 leading to a coupler 46 connectable therewith.

Further, the rear end of the pipe 41 connected to the two electromagnetic control valves 34 is connected to the middle of the feeding pipe 47.
In the middle of the return conduit 48, the rear ends of the conduits 42 connected to the two electromagnetic control valves 34 are connected together as a single conduit 77, and the combined single conduit 77 is provided with a relief valve 78 which is a first valve.

On the other hand, the electromagnetic control valve 34 is provided with a pipe line 81 which is connected to the pipe line 40 leading to the head side oil chamber 79 of each hydraulic jack 26 and has a check valve 80 with a variable throttle. The check valve 80 with a throttle controls the flow rate of oil returning from the head-side oil chamber 79 of the hydraulic jack 26.

Further, the conduit 8 having a check valve 82 is provided in the middle of the connection position of the conduit 81 to the check valve 80 with a variable throttle.
3 are connected to each other, and the conduit 83 is connected to the return conduit 48 via the relief valve 85 of the second valve, which is integrated into one conduit 84.

Here, the relief valve 78 is a head of the return-side hydraulic jack 26 which is opposed when the predetermined hydraulic jack 26 presses the inner cylinder 17 to press the opposing hydraulic jack 26. Side oil chamber 79, pipeline 40, pipeline 8
1, a predetermined pressure is set so that the pressure in the series of flow paths of the electromagnetic control valve 34 and the pipe 42 does not become zero.

The front-stage cylindrical portion 12 is connected via the hydraulic jack 26.
The control device for tilting the cylinders is shown in FIG. 5, in which the hydraulic jack pressure P1 which is the thrust of each hydraulic jack 26 detected by the pressure sensor 35 and the inner cylinder 17 detected by the stroke detector 29 are extended. Is the displacement direction X1 of the front cylindrical portion 12,
The soil pressure P2 acting on the second outer cylinder 20 of the rear cylindrical portion 13 detected by the soil pressure detector 30 can be given to the arithmetic control unit 91 of the control device 90 installed on the ground as a detection signal. There is.

The selection Sa of the hydraulic jack 26 and the extension amount La of the hydraulic jack 26 when the front cylindrical portion 12 is tilted are set in the arithmetic control unit 91 of the control unit 90 by the host system control unit 92 such as a CPU or the operator. Therefore, the other operation command C1 can also be given to the arithmetic and control unit 91 of the control device 90. In addition, from the arithmetic control unit 91 of the control device 90 to the host control device 92,
The operating state information I can be given.

Further, based on various data given from the host system control device 92 and the like, the arithmetic control unit 91 in the control device 90 can give a switching command V to the electromagnetic control valve 34. In FIG. 5, reference numeral 93 is a display unit for displaying operation state data from the arithmetic and control unit 91 in the control device 90.

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

When changing the direction of the tip device 1,
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. 4 are always PO1 <PO2.
The pressure is adjusted so that
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 is transferred to the pipe lines 67, 73, the switching valve 72, and the return pipe. It circulates through the path 70 to the tank 69.

In addition, from the host controller 92 to the tip 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 cylindrical portion 12, the extension amount La of the hydraulic jack 26, and other operation commands C1 are transmitted to the control device 9.
0 is given to the arithmetic control unit 91. Therefore, when the operation button for starting the change of the propulsion direction D1 is turned on, the arithmetic control unit 91 of the control device 90 gives a switching command to the switching valve 72 of the hydraulic unit 60, and the conduit 73 is provided.
Oil is switched 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 so that one of the pair of hydraulic jacks 26 is connected. 81 is connected to the feeding side pipeline 41 and the other pipeline 81 is connected to the return pipeline 42, or the other pipeline 81 is connected to the feeding pipeline 41 and The conduit 81 is switched to connect to the conduit 42 on the return side.

Therefore, in one electromagnetic control valve 34 of the two electromagnetic control valves 34, a pair of hydraulic jacks 26 are provided.
When one of the pipelines 81 is connected to the pipeline 41 on the feeding side and the other pipeline 81 is connected to the pipeline 42 on the return side, the discharge is made from the hydraulic pump 63. The oil passes through the pipes 67, 75, 47, 41 and the electromagnetic control valve 34, and is introduced from the pipe 81 through the pipe 40 into the head side oil chamber 79 of the hydraulic jack 26.
The inner cylinder 17 is pressed by extending the same, and at the same time, the oil in the head-side oil chamber 79 of the hydraulic jack 26 which is opposed to the inner cylinder 17 is discharged, and the electromagnetic control valve 3 is passed through the other conduits 40 and 81.
4 through the conduit 42, the conduit 77 and the relief valve 78, the return conduit 48, the conduits 76 and 70, and the return to the tank 69.

In one electromagnetic control valve 34 of the two electromagnetic control valves 34, the other pipeline 81 of the pair of hydraulic jacks 26 is connected to the pipeline 41 on the feeding side and the other pipeline is connected. When 81 is switched to connect to the return-side pipe 42, the oil discharged from the hydraulic pump 63 passes through the pipes 67, 75, 47, 41 and the electromagnetic control valve 34.
Through the other conduit 81 in the above case through the conduit 40 to the head side oil chamber 79 of the hydraulic jack 26 on the opposite side, and by extending the hydraulic jack 26 on the opposite side, the inner cylinder 17 The oil in the head-side oil chamber 79 of the opposing hydraulic jack 26 is discharged at the same time, and the oil passes through the electromagnetic control valve 34 via one of the conduits 40 and 81 in the above case. From line 42, via line 77 and relief valve 78, through return line 48, lines 76, 70, tank 69
Returned to.

Further, in the other electromagnetic control valve 34 of the two electromagnetic control valves 34, another pair of hydraulic jacks 26 is provided.
Is operated in the same manner as the one electromagnetic control valve 34 described above, and when two electromagnetic control valves 34 are operated simultaneously, the two pairs of hydraulic jacks 26 are extended in the vertical direction. Then, the pressing direction of the inner cylinder 17 is the same as the extending direction of the two pairs of hydraulic jacks 26.

Here, the tilting angle of the inner cylinder 17 depends on the inner cylinder 17
It is determined by detecting the tilt data by the two stroke detectors 29 which are shifted in the circumferential direction and arranged substantially at right angles, and the detected values are calculated.

When the predetermined hydraulic jack 26 is extended by a predetermined amount, the hydraulic jack 26 radially presses the inner cylinder 17 of the front cylindrical portion 12 to cause the spherical center of the convex spherical seat 18 to move. The front cylindrical portion 12 is tilted by a predetermined displacement amount about the center of rotation, and the front portion 4 of the tip device 1 is oriented in a desired direction.

Subsequently, when the propulsion direction D1 of the tip apparatus 1 is further changed, the hydraulic jack pressure P1 by the pressure sensor 35 and the displacement direction X1 of the front cylindrical portion 12 by the stroke detector 29 are further changed. The earth pressure detector 30 detects the earth pressure P2 acting on the outer peripheral surface of the rear cylindrical portion 13 and supplies the earth pressure P2 to the arithmetic control unit 91 of the control device 90 to perform a predetermined arithmetic operation, whereby the switching command V Thus, the electromagnetic control valve 34 is controlled to an appropriate state.

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

On the other hand, when the tip device 1 is pressed by the source pushing device 8 shown in FIG. 6 so as to form a tunnel, the thrust applied to the tip device 1, the force applied in the radial direction of the tip device 1, etc. are convex spherical surfaces. It is received by the concave spherical seat 21 of the rear cylindrical portion 13 via the seat 18.

Therefore, since the direction of the stroke of the hydraulic jack 26 required for tilting the front cylindrical portion 12 is not the propelling direction D1 of the tip device 1 but the radial direction of the inner cylinder 17 of the front cylindrical portion 12, the tip device 1 Can shorten the total length of the driving direction D1 of
As a result, it is possible to easily carry in the shaft 9 which is the starting point, and to improve the controllability of controlling the direction of the tip device 1. Further, since the thrust applied to the tip device 1 is supported by the convex spherical seat 18, the hydraulic jack 26 can be miniaturized, the occupancy of the installation space can be reduced, and the space inside the direction correcting device 6 can be effectively used.

Further, in the hydraulic circuit 61, since the liquid discharged from the contracting hydraulic jack 26 is held at a predetermined pressure or higher by the relief valve 78, the inner cylinder 17 and the liquid of the bending portion 5 where the tip device 1 bends. Even if some 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 brought into contact with each other. It is possible to completely suppress the gap between the inner cylinder 17 and the hydraulic jack 26, which adversely affects the controllability of the direction.

Since a plurality of pairs of hydraulic jacks 26 are provided in the circumferential direction of the inner cylinder 17, the inner cylinder 17 can be tilted in various directions according to the extending direction of the plurality of pairs of hydraulic jacks 26.

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

When an abnormal hydraulic pressure is generated in the conduits 40, 81 connecting the head side liquid chamber 79 of the hydraulic jack 26 and the electromagnetic control valve 34, the conduit 84 having the relief valve 85 allows the hydraulic jack 26 to operate. Since the liquid pressure is released from the conduits 40 and 81 connecting the head side liquid chamber 79 and the electromagnetic control valve 34 to the return conduit 48 on the downstream side of the relief valve 78, the direction correcting device 6 can be used reliably and safely. it can.

From the above, according to the illustrated example, it is possible to provide the direction correcting device so as to constitute the direction correcting device which is small in size and has excellent durability and operability.

It should be noted that the embodiment of the present invention is not limited to the above illustrated examples, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

[0063]

As described above, according to the direction correcting device of the present invention, various excellent effects as described below can be obtained.

(I) Since the stroke direction of the hydraulic jack is not the propelling direction but the radial direction of the inner cylinder, the total length of the device can be shortened, and as a result, it can be easily carried into the vertical shaft that is the starting point. At the same time, the controllability of controlling the direction of the device can be improved. Further, in the hydraulic circuit, the liquid discharged from the contracting hydraulic jack is held at a predetermined pressure or more by the first valve, so that the inner cylinder of the bent portion where the tip device is bent and the hydraulic jack are somehow damaged. Even when an external force is applied, the inner cylinder and hydraulic jack are kept in contact with each other by preventing the hydraulic jack from malfunctioning, and as a result, the controllability of the bent portion and the tilt direction is adversely affected. The gap between the hydraulic jack and the hydraulic jack can be completely suppressed.

(II) In the case of claim 2 of the present invention, since a plurality of pairs of hydraulic jacks are provided in the circumferential direction of the inner cylinder, various inner jacks can be formed by matching the extending directions of the plurality of pairs of hydraulic jacks. Can tilt in the direction of.

(III) In the third aspect of the present invention, since the check valve with a variable throttle is provided in the pipe line connecting the head-side fluid chamber of the hydraulic jack and the switching valve, the head-side hydraulic pressure of the hydraulic jack is provided. The flow rate of the liquid returning from the chamber can be controlled to adjust the operation speed of the tilting by the hydraulic jack.

(IV) In the case of claim 4 of the present invention, when an abnormal hydraulic pressure is generated in the pipeline connecting the head side fluid chamber of the hydraulic jack and the switching valve, the pipeline having the second valve Due to
Since the hydraulic pressure is released from the conduit connecting the head-side liquid chamber of the hydraulic jack and the switching valve to the return conduit downstream of the first valve, the device can be used reliably and safely.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an example of an embodiment of a direction correcting device of the present invention.

FIG. 2 is a side view of an example of an embodiment of the direction correcting device of the present invention.

3 is a III-III direction arrow view of FIG. 1. FIG.

FIG. 4 is a hydraulic circuit diagram applied to the direction correcting device of the present invention.

FIG. 5 is a control system diagram applied to the direction correcting device of the present invention.

6 is a side view showing an outline of a pipe burying device to which the direction correcting device shown in FIG. 1 is applied.

FIG. 7 is a side view showing an outline of a vibration generator used in a conventional press-fitting method.

8 is a side view showing an outline of a pipe burying device to which the vibration generating device shown in FIG. 7 is applied.

FIG. 9 is a side view showing an outline of a direction correcting device used in a conventional direction correcting method.

[Explanation of symbols]

1 Advanced equipment 4 front 6 direction correction device 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) 48 Return line 63 Hydraulic pump (hydraulic pump) 69 tank 78 Relief valve (first valve) 79 Head side oil chamber (head side liquid chamber) 80 Check valve with variable throttle 81 pipeline 84 pipeline 85 Relief valve (second valve)

─────────────────────────────────────────────────── ─── Continued Front Page (72) Yuichi Miura, Inventor Yuichi Miura, 1-1-15 Toyosu, Koto-ku, Tokyo Ishikawa Shima Harima Heavy Industries, Ltd. Tokyo Engineering Ring Center (72) Minor Tanaka, Otemachi, Chiyoda-ku, Tokyo 3-3-1 Nihon Telegraph and Telephone Corporation (72) Inventor Toshihiko Takanashi 2-3-1 Otemachi, Chiyoda-ku, Tokyo 3-3-1 Nihon Telegraph and Telephone Corporation (Inventor) Hidenori Hino 2-Otemachi, Chiyoda-ku, Tokyo 3rd to 1st Nippon Telegraph and Telephone Corporation (56) Reference JP-A-11-36784 (JP, A) JP 60-56876 (JP, B2) JP 7-76511 (JP, B2) JP Kohei 2-35116 (JP, B2) Actual Kohei 7-8633 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/06 311

Claims (4)

(57) [Claims] 1. A convex spherical seat that is housed in a first outer cylinder that is mounted in a tip device that propels in the ground, and an external fitting that is provided on the second outer cylinder and that is fitted to the convex spherical seat. Inside the second outer cylinder so as to correct the propulsion direction of the front portion of the tip device through the convex spherical seat by radially pressing the concave spherical seat and the inner cylinder connected to the convex spherical seat. In a direction correcting device provided with a required pair of hydraulic jacks, the liquid from the hydraulic pump is fed to one of the paired hydraulic jacks so as to press the inner cylinder in the radial direction. A switching valve configured to return the liquid discharged from the other hydraulic jack to the tank while being supplied and pressed by the inner cylinder, and the hydraulic pressure of the hydraulic jack on the side where the liquid is discharged is maintained at a predetermined pressure or more. A switching valve and a first valve arranged in the return line provided between the tank and A direction correcting device characterized by the above. 2. The direction correcting device according to claim 1, wherein a plurality of pairs of hydraulic jacks are provided in the circumferential direction of the inner cylinder. 3. A check valve with a variable throttle is provided in a pipe line connecting a head-side liquid chamber of a hydraulic jack and a switching valve.
The direction correction device described. 4. The set pressure is higher than that of the first valve so as to release an abnormal hydraulic pressure from a conduit connecting the head-side liquid chamber of the hydraulic jack and the switching valve to a return conduit downstream of the first valve. 4. The direction correcting device according to claim 1, 2 or 3, comprising a conduit having a second valve.