JPH09189193A - Small-bore pipe jacking machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of hydraulic pipings connecting a ground unit and a leading body. SOLUTION: This pipe jacking machine has a leading body 1 with a hydraulic motor 12 for a cutter, a direction correction jack 13 driving a front drum, and a direction changeover valve 21 for the jack, a ground unit 6, in which a direction changeover valve 21 for the jack, a pressure-oil feed line 26, a hydraulic pump 20 for the jack, a tank 25, a hydraulic pump 18 for the cutter, and a direction changeover valve 19 for the cutter are arranged, the return line 28 of the direction changeover valve 21 for the jack, and a drain line 24 introducing the drain oil of the hydraulic motor 12 for the cutter to the tank 25 of the above-mentioned ground unit 6. The end section of the return line 28 of the direction changeover valve 21 for the jack is connected to the drain line 24 in the leading body 1 while a suction type drain pump 29 is mounted on its midway of the drain line 24 placed in the ground unit 6 at that time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small diameter pipe propulsion device for burying a small diameter pipe having a diameter of 300 mm or more and 700 mm or less in the ground.

[0002]

2. Description of the Related Art FIGS. 15 to 17 are views for explaining a conventional small-diameter pipe propulsion machine. FIG. 15 is a circuit diagram showing a main part of the small-diameter pipe propulsion machine, and FIG. 16 is an entire small-diameter pipe propulsion machine. 17 is a side view showing the schematic configuration of FIG. 17, and FIG. 17 is a vertical cross-sectional view showing the leading conductor portion of the small diameter tube propulsion machine.

As shown in FIG. 16, a small-diameter pipe propulsion machine of this type is arranged in a leading conductor 1 for excavating the inside of a natural ground 5 and a starting shaft 3 and is inserted in the rear portion of the leading conductor 1. Buried pipe 2
A source push jack 4 that gives a propulsive force to the front conductor 1 via
A hydraulic hose / cables 7 for supplying hydraulic pressure, electric power, etc. to the drive means arranged in the leading conductor 1, and a hydraulic source etc. arranged on the ground and to which the ends of the hydraulic hose / cables 7 are connected. And the ground unit 6 including.

As shown in FIG. 17, the above-described front conductor 1 is provided with a front body 1A and a rear body 1B which form a casing, and the front body 1A is expanded and contracted by a direction correcting jack 13 with respect to the rear body 1B. And its axial direction can be displaced.
A cutter head 8 for excavating the natural ground 5 is provided at the tip of the front body 1A, and a cutter drive shaft 9 for rotating the cutter head 8 and the cutter drive shaft 9 are held inside the front body 1A. The bearing 10 includes a cutter drive device 11 that transmits a rotational force to the cutter drive shaft 9, and a cutter hydraulic motor 12 that drives the cutter drive device 11. The cutter hydraulic motor 12 is connected to the hydraulic hose of the hydraulic hoses and cables 7 described above. In addition, in the tip conductor 1, a viscosity-imparting agent injection hole 14 into which a viscosity-imparting agent that imparts viscosity to the excavated earth and sand 15 for smoothing the pressure transfer is introduced, or the excavated earth and sand 15 is discharged through an earth pipe 17. The earth and sand pressure pump 16 for discharging to the ground is also provided.

A hydraulic circuit shown in FIG. 15 is formed between the front conductor 1 and the ground unit 6. In this figure, 12 is the cutter hydraulic motor described above, and 13 is the direction correcting jack. In addition to the cutter hydraulic motor 12 and the direction correcting jack 13, a jack direction switching valve 21 that controls the driving of the direction correcting jack 13 is arranged in the front conductor 1. In addition, in the ground unit 6,
A cutter hydraulic pump 18 that supplies pressure oil for driving the cutter hydraulic motor 12, and a cutter that is disposed between the cutter hydraulic pump 18 and the cutter hydraulic motor 12 and that controls the drive of the cutter hydraulic motor 12. Direction switching valve 19
A jack hydraulic pump 20 for supplying pressure oil to the direction correcting jack 13 via the jack direction switching valve 21 and the tank 25 are arranged.

Various hydraulic pipes included in the above-mentioned hydraulic hoses and cables 7 are arranged between the ground unit 6 and the lead conductor 1. As these hydraulic pipes, for example, a pressure oil supply pipe line 26 for supplying the pressure oil of the jack hydraulic pump 20 to the direction correcting jack 13 via the jack direction switching valve 21 and the jack direction switching valve 2 are provided.
The return oil of the direction correction jack 13 is stored in the tank 25 via
To the tank 25, a return pipe 27 that guides the drain oil of the cutter hydraulic motor 12 to the tank 25, and main pipes 22 and 23 that connect between the cutter direction switching valve 19 and the cutter hydraulic motor 12. There is. The cutter hydraulic motor 12 will be damaged unless the hydraulic oil leaking into the casing is discharged to the outside at an extremely low pressure. Therefore, as described above, the drain conduit 24 is provided independently of the other hydraulic circuits.

In the small-diameter tube propulsion machine constructed in this way, as shown in FIG.
By arranging the front conductor 1 and the source push jack 4 in the starting shaft 3, and driving the cutter head 8 and the source push jack 4 of these front conductors 1, the first buried pipe is placed behind the front conductor 1. A hole for burying one 2 is formed. The first buried pipe 2 is accommodated in the hole, that is, in the rear portion of the leading conductor 1. Here, again, the rear portion of the embedded pipe 2 accommodated is pushed by the original push jack 4 and excavated by the cutter head 8 of the front conductor 1. As a result, a hole for burying the next buried pipe 2 is formed behind the first buried pipe 2. In the same manner, the buried pipes 2 are successively added one by one.

[0008]

By the way, as described above, the buried pipes 2 are inserted into the holes formed by the front conductor 1 one by one.
When additionally inserting, that is, before inserting the buried pipe 2,
The hydraulic hoses and cables 7 between the ground unit 6 and the lead conductor 1 are disconnected each time, and the pressure oil supply line 26, the return line 27, the drain line 24, the main line 22, and the like shown in FIG. Disconnect the respective connections of 23 and apply the corresponding buried pipe 2
After inserting, the work of connecting each of the above-mentioned pipes again is required. Therefore, in the conventional technique, there is a problem that the burying work of the buried pipe 2 takes time.

The present invention has been made in view of the above circumstances in the prior art, and an object thereof is to provide a small-diameter pipe propulsion machine capable of reducing the number of hydraulic pipes connecting the ground unit and the lead conductor. To provide.

[0010]

In order to achieve this object, the invention according to claim 1 of the present invention has a cutter head for excavating earth and sand at the tip and drives this cutter head inside. Hydraulic motor for cutter for
A front conductor having a direction correcting jack for driving the front body and a jack direction switching valve for driving the direction correcting jack, a pressure oil supply line for guiding pressure oil to the jack direction switching valve, and the pressure oil. A jack hydraulic pump connected to the supply pipeline, a tank, and a return pipeline for guiding the return oil from the jack directional switching valve to the tank, at least the pressure oil supply pipeline of these, A hydraulic pump for the jack, and a ground unit in which the tank is arranged;
In a small diameter pipe propulsion machine provided with a drain conduit for guiding drain oil of the cutter hydraulic motor to the tank of the ground unit, in the lead conductor, the return conduit and the drain of the jack directional control valve. The end of one of the pipelines is connected to the other pipeline of the return pipeline and the drain pipeline, and the drain pipeline is located in the ground unit, and the drain pipeline is located in the middle of the drain pipeline. A drain pump for sucking the drain oil in the pipeline is provided.

In the invention according to claim 1 having such a structure, the end portion of one of the return pipe line and the drain pipe line of the jack directional control valve is connected to the return pipe line and the drain pipe in the lead conductor. Since it is connected to the other pipeline of the pipeline, this other pipeline can be used as both the drain pipeline and the return pipeline of the jack directional control valve, and the hydraulic pipeline connecting the front conductor and the ground unit. Can be reduced by one pipe line.

Further, since the drain pump for sucking the drain oil in the drain pipe is provided in the ground unit, the drain oil flowing in the drain pipe by the drain pump and the return oil of the direction switching valve for the jack are supplied to the tank. It can be discharged well.

According to a second aspect of the present invention, in the invention according to the first aspect, between the connection point of the return line and the drain line of the jack directional control valve and the cutter hydraulic motor. A safety valve having one end open to the atmosphere is provided in the drain pipe portion located at.

In the invention according to claim 2 configured as described above, the same operation as that of the invention according to claim 1 described above is obtained, and in addition, when the pressure in the drain pipe line becomes equal to or higher than a predetermined pressure, the safety valve is activated. The excess pressure is released to the atmosphere via. Therefore, damage to the cutter hydraulic motor due to the pressure of the drain oil can be prevented more reliably.

According to a third aspect of the invention, in the invention according to the first aspect, between the connection point of the return pipe line and the drain pipe line of the jack directional control valve and the cutter hydraulic motor. A hydraulic pressure detector for detecting the hydraulic pressure in the drain pipeline is provided at the drain pipeline located at the position, and the signal value output from this hydraulic detector is compared with a preset hydraulic pressure upper limit value. A control device for outputting a control signal for activating the drain pump when the signal value exceeds the hydraulic pressure upper limit value is provided.

In the invention according to claim 3 configured as described above, the same operation as that of the invention according to claim 1 described above is obtained, and in the control device, the signal value output from the oil pressure detector is the oil pressure upper limit value. When it is determined that the pressure in the drain pipe has been exceeded, a control signal for starting the drain pump is output from this control device, and the drain pump is activated to positively flow the oil in the drain pipe to the tank to reduce the pressure in the drain pipe. Lower. That is,
Energy can be saved because the drain pump is driven only when the pressure in the drain pipe exceeds the upper limit value.

The invention according to claim 4 has a cutter head for excavating earth and sand at the tip, and a cutter hydraulic motor for driving the cutter head inside,
A front conductor having a direction correcting jack for driving the front body and a jack direction switching valve for driving the direction correcting jack, a pressure oil supply line for guiding pressure oil to the jack direction switching valve, and the pressure oil. A jack hydraulic pump connected to the supply pipeline, a tank, and a return pipeline for guiding the return oil from the jack directional switching valve to the tank, at least the pressure oil supply pipeline of these, A hydraulic pump for the jack, and a ground unit in which the tank is arranged;
In a small-diameter pipe propulsion machine provided with a drain conduit for guiding drain oil of the cutter hydraulic motor to the tank of the ground unit, in the lead conductor, the drain conduit and the return pipe of the jack directional control valve. A drain pipeline that connects one end of one of the pipelines to the other pipeline of the drain pipeline and the return pipeline and is located between the connection point and the cutter hydraulic motor. A drain pump for pumping drain oil is provided in the portion.

In the invention according to claim 4 having such a structure, the end of one of the drain conduit and the return conduit is connected to the other end of the drain conduit and the return conduit in the lead conductor. Since it is connected to the conduit, the other conduit can be used both as the return conduit and the drain conduit, and the hydraulic conduit connecting the lead conductor and the ground unit is reduced by one conduit. be able to.

Further, since the pumping type drain pump is provided in the drain pipe, the drain oil is satisfactorily discharged to the tank through the drain pipe and the return pipe even if the capacity of the drain pump is relatively small. be able to.

According to a fifth aspect of the invention, in the invention according to the fourth aspect, a drain hydraulic motor for driving the drain pump is provided in the lead conductor.

In the invention according to claim 5 configured as above, the same operation as that of the invention according to claim 4 described above is obtained, and in addition, the drain oil is more positively activated as the drain hydraulic motor is driven. Can be discharged.

According to a sixth aspect of the invention, in the invention according to the fifth aspect, a cutter hydraulic pump for supplying pressure oil for driving the cutter hydraulic motor to the ground unit, and a cutter hydraulic pump. A cutter directional switching valve that controls the flow of pressure oil supplied from the pump to the cutter hydraulic motor is provided, and pressure oil in the main pipeline that connects the cutter directional switching valve and the cutter hydraulic motor is provided. As a drive source, a drive means for driving the drain hydraulic motor is provided.

In the invention according to claim 6 configured as described above, the same operation as that of the invention according to claim 5 described above can be obtained, and the pressure oil for driving the cutter hydraulic motor is actuated by the operation of the drive means. When being guided to the road, that is, following the drive of the cutter hydraulic motor, the drain hydraulic motor can be driven to drain the drain oil.

According to a seventh aspect of the invention, in the invention according to the fifth aspect, the driving means for driving the drain hydraulic motor by using the pressure oil flowing through the return pipe of the jack directional control valve as a drive source. Is provided.

In the invention according to claim 7 configured as described above, the same action as that of the invention according to claim 5 described above can be obtained, and in addition, the return pipe is driven by the operation of the driving means by the operation of the direction correcting jack. When the pressure oil is guided to the road, that is, when the direction correcting jack is driven, the drain hydraulic motor can be driven to discharge the drain oil.

The invention according to claim 8 is the structure according to claim 4 in which drive means is provided for driving the drain pump in synchronization with the drive of the cutter hydraulic motor.

In the invention according to claim 8 configured as above, the same operation as that of the invention according to claim 4 described above can be obtained, and the hydraulic pressure for the cutter is similar to the invention according to claim 6 by the operation of the driving means. When driving the motor, the drain pump can be driven to drain the drain oil.

The invention according to claim 9 has a cutter head for excavating earth and sand at its tip, and a cutter hydraulic motor for driving the cutter head inside,
A front conductor having a direction correcting jack for driving the front body and a jack direction switching valve for driving the direction correcting jack, a pressure oil supply line for guiding pressure oil to the jack direction switching valve, and the pressure oil. A jack hydraulic pump connected to the supply pipeline, a tank, a return pipeline for guiding the return oil from the jack directional control valve to the tank, and a cutter for supplying pressure oil for driving the cutter hydraulic motor. And a cutter directional control valve for controlling the flow of pressure oil supplied from the cutter hydraulic pump to the cutter hydraulic motor, and the cutter directional control valve and the cutter hydraulic motor. A main pipe, and at least the pressure oil supply pipe, the jack hydraulic pump, the tank, the cutter hydraulic pump, and the directional switch valve for the cutter are arranged among them. That the ground unit, the small-diameter pipe propulsion machine having a drain line for the drain oil of the hydraulic motor for the cutter leading to the tank of the ground unit,
An end of one of the return conduit and the drain conduit of the jack directional control valve is connected to the conduit of the main conduit, which is in communication with the tank, in the lead conductor. And means for providing an end portion of the other conduit of the return conduit and the drain conduit in the leading conductor,
A drain pump for pumping drain oil is provided in the middle of the drain pipe located in the leading conductor, the drain pump being connected to the one pipe.

In the invention according to claim 9 having such a configuration, the end portion of one of the return pipe line and the drain pipe line of the jack directional control valve in the lead conductor is connected to the directional valve for the cutter. And the hydraulic motor for the cutter are connected to a pipe line on the side communicating with the tank, and the end of the other pipe line of the return pipe line and the drain pipe line is connected to the one pipe line. Since the main conduit is connected to the tank, the conduit on the side communicating with the tank can also be used as the return conduit and the drain conduit of the jack directional control valve. It is possible to reduce the number of hydraulic pipes connecting the two by the return pipe line and the drain pipe line.

Further, since the pumping type drain pump is provided in the drain pipe, even if the drain pump has a relatively small capacity, the drain oil is connected to the tank of the main pipes described above. It can be satisfactorily discharged to the tank via.

The invention according to claim 10 is the invention according to claim 9.
In the invention according to the above aspect, a drain hydraulic motor for driving the drain pump is provided.

According to the tenth aspect of the invention thus constructed, the same operation as the above-mentioned ninth aspect of the invention can be obtained, and in addition to driving the drain hydraulic motor,
Drain oil can be discharged more actively.

The invention according to claim 11 is the invention according to claim 1.
In the invention according to No. 0, drive means for driving the drain hydraulic motor is provided by using the pressure oil in the main pipeline as a drive source.

According to the eleventh aspect of the invention thus configured, the same operation as the above-described tenth aspect of the invention is obtained, and the pressure oil for driving the cutter hydraulic motor is actuated by the operation of the drive means. It is possible to drive the drain hydraulic motor to discharge the drain oil when being guided to the road, that is, when the cutter hydraulic motor is driven.

The invention according to claim 12 is the same as claim 1
In the invention according to No. 0, the driving means for driving the drain hydraulic motor is provided by using the pressure oil flowing in the return conduit of the jack directional control valve as a driving source.

In the invention according to claim 12 thus constructed, in addition to the same effect as that of the invention according to claim 10 described above, the return pipe is driven by the driving of the direction correcting jack by the operation of the driving means. When the pressure oil is guided to the road, that is, when the direction correcting jack is driven, the drain hydraulic motor can be driven to discharge the drain oil.

The invention according to claim 13 is the invention according to claim 9.
In the invention according to the above aspect, a drive means for driving the drain pump in synchronization with the drive of the cutter hydraulic motor is provided.

According to the thirteenth aspect of the invention thus constructed, the same operation as that of the ninth aspect of the invention can be obtained, and the cutter hydraulic pressure can be obtained by the operation of the driving means as in the eleventh aspect of the invention. When the motor is driven, the drain hydraulic motor can be driven to drain the drain oil.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a small diameter pipe propulsion device of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a main part of a first embodiment of a small diameter tube propulsion machine corresponding to claim 1 of the present invention. This FIG. 1 is drawn corresponding to FIG. 15 described above. Further, in the first embodiment, although not shown, the overall schematic configuration and the basic configuration of the lead conductor are the same as those shown in FIGS. 16 and 17, for example.

Even in the first embodiment shown in FIG. 1,
As in the case shown in FIG. 15, the cutter hydraulic motor 12, the direction correcting jack 13, and the jack direction switching valve 21 for controlling the driving of the direction correcting jack 13 are arranged in the front conductor 1. . Further, in the ground unit 6, a cutter hydraulic pump 18 for supplying pressure oil for driving the cutter hydraulic motor 12, and the cutter hydraulic pump 1
8 is arranged between the hydraulic motor 12 for cutter and the directional switching valve 19 for cutter for controlling the drive of the hydraulic motor 12 for cutter, and the directional switching valve 21 for jack is used to supply pressure oil to the direction correction jack 13. Hydraulic pump for jack 20
And a tank 25 are arranged.

In particular, in the first embodiment shown in FIG. 1, the end of the return conduit 28 of the jack directional control valve 21 is connected to the drain conduit 24 in the front conductor 1. Further, a drain pump 29 for sucking the drain oil in the drain conduit 24 is arranged in the middle of the drain conduit 24 located in the ground unit 6. In FIG. 1, reference numeral 26 is a pressure oil supply conduit for supplying pressure oil from the jack hydraulic pump 20 to the direction correcting jack 13 via the jack direction switching valve 21, and 22 and 23 are cutter direction switching valves. 19 and the hydraulic motor 12 for the cutter are main conduits, and the pressure oil supply conduit 26 and the main conduits 22 and 23, together with the drain conduit 24, are provided between the front conductor 1 and the ground unit 6. It is connected to the.

In the first embodiment constructed as described above,
In the lead conductor 1, the return line 2 of the jack directional control valve 21
Since the end portion of 8 is connected to the drain conduit 24, this drain conduit 24 can also be used as the return conduit of the jack directional control valve 21, and the front conductor 1 and the ground unit 6 are connected. It is possible to reduce the hydraulic piping by one return line. Therefore, at the time of burying the buried pipe 2 described above, the working time for shutting off and connecting the hydraulic pipe can be shortened, and the efficiency of the burying work of the buried pipe 2 can be improved.

Further, the drain line 24 is provided in the ground unit 6.
Since the drain pump 29 for sucking the drain oil therein is provided, the drain oil flowing through the drain conduit 24 and the return oil of the jack directional control valve 21 can be satisfactorily guided to the tank 25 by the drain pump 29. Therefore,
Stable driving of the direction correction jack 13 can be ensured, and working oil is not excessively accumulated in the casing of the cutter hydraulic motor 12, and damage to the cutter hydraulic motor 12 due to the pressure of the drain oil can be prevented. .

FIG. 2 is a circuit diagram showing an essential part of a second embodiment corresponding to claim 2 of the present invention. In the second embodiment shown in FIG. 2, the drain conduit 24 is located between the connection point between the return conduit 28 and the drain conduit 24 of the jack directional control valve 21 and the cutter hydraulic motor 12. A safety valve having one end open to the atmosphere, that is, a check valve 30 is provided. Other configurations are, for example, equivalent to those of the first embodiment described above.

In the second embodiment having such a configuration,
In addition to the same effects and advantages as the first embodiment described above,
When the pressure in the drain conduit 24 rises above a predetermined pressure for some reason, that is, above the cracking pressure of the check valve 30, the check valve 30 operates to cause an excess in the drain conduit 24. Pressure is released to the atmosphere. Therefore, even if there is such an abnormality,
It is possible to more reliably prevent damage to the cutter hydraulic motor 12 due to the pressure of the drain oil, which contributes to safety protection of the cutter hydraulic motor 12 and the like.

FIG. 3 is a circuit diagram showing an essential part of a third embodiment corresponding to claim 3 of the present invention. The hydraulic pressure in the drain pipe 24 is detected in the portion of the drain pipe 24 located between the connection point between the return pipe 28 and the drain pipe 24 of the jack directional control valve 21 and the cutter hydraulic motor 12. The hydraulic pressure detector 31 is provided, and a signal value output from the hydraulic pressure detector 31 is compared with a preset hydraulic pressure upper limit value, and the signal value output from the hydraulic pressure detector 31 exceeds the hydraulic pressure upper limit value. In this case, a control device 32 that outputs a control signal for starting the drain pump 29 is provided. Although not shown in FIG. 3, the control signal of the control device 32 is output as a signal for driving an electric motor for driving the drain pump 29, for example. Other configurations are, for example, the same as those of the first embodiment shown in FIG. 1 described above.

In the third embodiment configured as described above,
When the controller 32 determines that the signal value output from the oil pressure detector 31 exceeds the oil pressure upper limit value, in addition to the same effect as that of the first embodiment shown in FIG.
A control signal for activating the drain pump 29 is output from the control device 32, and the drain pump 29 is activated to positively flow the oil in the drain conduit 24 to the tank 25 to reduce the pressure in the drain conduit 24. . That is, the drain line 2
Drain pump 29 only when the pressure in 4 exceeds the upper limit
Since it is driven, it is economical to save energy. Further, similarly to the above-described second embodiment, damage to the cutter hydraulic motor 12 due to the pressure of drain oil can be prevented more reliably, which contributes to safety protection of the cutter hydraulic motor 12 and the like.

In all of the first to third embodiments described above, the end of the return pipe 28 of the jack directional control valve 21 is connected to the drain pipe 24, and the end of the drain pipe 24 is grounded. The drain pump 29 is provided in the drain pipe 24 portion of the ground unit 6 extending to the tank 25 portion of the unit 6, but instead of such a configuration, the end of the drain pipe 24 is returned in the lead conductor 1. Connected to the line 28, the return line 28
Extend the end of the to the tank 25 part of the ground unit 6,
A drain pump 29 is provided in the return line 28 of the ground unit 6.
May be provided.

FIG. 4 is a circuit diagram showing an essential part of a fourth embodiment corresponding to claim 4 of the present invention, and FIG. 5 is a vertical sectional view showing a front conductor portion of the fourth embodiment shown in FIG. is there. This fourth
In the first embodiment, the end of the drain conduit 33 is connected to the return conduit 27 of the jack directional control valve 21 in the lead conductor 1 and is located between the connection point and the cutter hydraulic motor 12. A drain pump 34 for pumping up drain oil is provided in the drain conduit 33 portion. Other configurations are basically the same as those of the first embodiment shown in FIG. 1 described above.

In the fourth embodiment having such a configuration,
Since the end portion of the drain conduit 33 is connected to the return conduit 27 of the jack directional control valve 21 in the leading conductor 1, the return conduit 27 can be used also as the drain conduit. It is possible to reduce the number of hydraulic lines connecting 1 and the ground unit 6 by one drain line. As a result, as in the first embodiment described above, the buried pipe 2
In the burying work, the work time for disconnecting and connecting the hydraulic pipe can be shortened, and the efficiency of the burying work of the buried pipe 2 can be improved.

Since the drain pipe 34 is provided with the pumping type drain pump 34, the drain pump 34
Even if the capacity of the
3. The drainage system can be satisfactorily discharged to the tank 25 via the return pipe line 27, and a drainage system having stable performance and structure can be formed.

FIG. 6 is a circuit diagram showing an essential part of a fifth embodiment corresponding to claims 5 and 6 of the present invention, and FIG. 7 is a vertical cross section showing a front conductor portion of the fifth embodiment shown in FIG. It is a figure. In the fifth embodiment, the drain hydraulic motor 35 for driving the drain pump 34 is provided in the lead conductor 1, and the cutter directional control valve 19 and the cutter hydraulic motor 12 are provided.
As a drive source, the pressure oil in the main pipelines 22 and 23 connecting
Drive means for driving the drain hydraulic motor 35 is provided.

The above-mentioned driving means has a conduit 35a and a conduit 35b whose both ends are connected to the main conduits 22 and 23, respectively.
And a check valve 38 provided in the conduit 35a for allowing the flow of pressure oil from the main conduit 22 and blocking the reverse flow, and a flow of pressure oil from the main conduit 23 also provided in the conduit 35a. The check valve 39 for blocking the reverse flow and the conduit 3 for connecting the above-described check valve 38 and the main conduit 22.
The throttle valve 36 provided in the portion 5a and the check valve 3 described above.
9 and the throttle valve 37 provided in the pipe line 35a portion connecting the main pipe line 23, and the check valve 4 provided in the pipe line 35b for blocking the flow of pressure oil from the main pipe line 22 and allowing the reverse flow.
0, a check valve 4 which is also provided in the conduit 35b and blocks the flow of pressure oil from the main conduit 23 and allows the reverse flow.
1 and one end of which is connected to a pipe line 35a located between the check valve 38 and the check valve 39, and the other end of which is connected to one supply / discharge port of the drain hydraulic motor 35.
c, one end of which is connected to the pipe line 35b located between the check valve 40 and the check valve 41, and the other end of which is connected to the other supply / discharge port of the drain hydraulic motor 35.
and d.

The other construction is the same as the fourth construction shown in FIG.
This is, for example, equivalent to the above embodiment. In the fifth embodiment configured in this way, in addition to the same effects as the above-described fourth embodiment, the drain oil is positively discharged by driving the drain hydraulic motor 35. be able to. That is, when the cutter directional control valve 19 is switched to, for example, the left position in FIG. 6 to supply the pressure oil of the cutter hydraulic pump 18 to the main conduit 22 to drive the cutter hydraulic motor 12, the throttle of the conduit 35a is closed. Pressure oil is guided to one of the supply / discharge ports of the drain hydraulic motor 35 through the valve 36, the check valve 38, and the pipe 35c, and the return oil from the other supply / discharge port is supplied to the pipes 35d and 35b. Check valve 4
1. Outflow into the tank 25 through the main pipe line 23, and the drain hydraulic motor 35 is driven thereby.

Further, the cutter direction switching valve 19 is switched to the right position in FIG. 6, and the cutter hydraulic pump 18 is connected to the main pipe line 23.
Is supplied to drive the cutter hydraulic motor 12, the throttle valve 37, the check valve 39,
Pressure oil is supplied to the drain hydraulic motor 35 via the conduit 35c, and the return oil flows out to the tank 25 via the conduit 35d, the check valve 40 of the conduit 35b, and the main conduit 22.

That is, when the cutter hydraulic motor 12 is driven, the drain hydraulic motor 35 is driven, which drives the drain pump 34 to positively discharge the drain oil to the drain conduit 33. Therefore, when driving the cutter hydraulic motor 12 that is likely to generate drain oil, the drain oil can be discharged in a timely manner.

FIG. 8 is a circuit diagram showing an essential part of a sixth embodiment corresponding to claims 5 and 7 of the present invention. In the sixth embodiment, a drain hydraulic motor 35 that drives a drain pump 34 is provided in the lead conductor 1, and pressure oil that flows through the return conduit 27 of the jack directional control valve 21 is used as a drive source. Drive means for driving the drain hydraulic motor 35 is provided. This drive means is configured by disposing the hydraulic motor 35 for drain in the return pipe 27 portion located between the connection point of the drain pipe 33 and the return pipe 27 and the jack directional control valve 21. ing. Other configurations are, for example, equivalent to those of the fourth embodiment shown in FIG. 4 described above.

In the sixth embodiment having such a configuration,
In addition to the same operational effect as the fourth embodiment described above, the return conduit 27 is driven by the driving of the direction correcting jack 13.
When the oil flows back to the drain hydraulic motor 35, the drain hydraulic motor 35 is driven, which drives the drain pump 34 to positively discharge the drain oil to the drain conduit 33 as in the fifth embodiment described above. be able to. That is, the drain oil can be discharged when the direction correcting jack 13 that is often operated at the same time when the cutter hydraulic motor 12 is driven, and the drain oil can be discharged at a relatively timing. FIG. 9 is a circuit diagram showing a main part of a seventh embodiment corresponding to claim 8 of the present invention, and FIG. 10 is a side view showing a cutter driving device portion of the seventh embodiment shown in FIG. The seventh embodiment is provided with drive means for driving the drain pump 34 in synchronization with the drive of the cutter hydraulic motor 12. As shown in FIG. 10, for example, this drive means is provided in the cutter drive device 11, and is provided with a cutter drive gear 42 that is rotationally driven, a drain pump drive gear 43 that meshes with the cutter drive gear 42, and a drain pump drive gear 43. And a shaft 43a that transmits the rotation as a force for driving the drain pump 34. Other configurations are, for example, equivalent to those of the fourth embodiment shown in FIG. 4 described above.

In the seventh embodiment having such a configuration,
In addition to the same effects and advantages as those of the above-described fourth embodiment, the drain pump 34 is driven when the hydraulic motor 12 for the cutter is driven by the operation of the drive means, similarly to the fifth embodiment, and the drain is positively driven. The oil can be drained. That is, the cutter hydraulic motor 12 that easily produces drain oil
When driving, the drain oil can be discharged at a good timing.

In all of the above fourth to seventh embodiments, the end portion of the drain conduit 33 is provided with the jack directional control valve 2.
The return pipe 27 is connected to the first return pipe 27, and the end portion of the return pipe 27 is extended to the tank 25 portion of the ground unit 6. The end of the passage 27 may be connected to the drain pipe 33, and the end of the drain pipe 33 may be extended to the tank 25 portion of the ground unit 6.

FIG. 11 shows the eighth aspect of the present invention.
It is a circuit diagram which shows the principal part of embodiment. In the eighth embodiment, the return conduit 28 of the jack directional control valve 21 and the main conduits 22 and 23 that connect the cutter directional control valve 19 and the cutter hydraulic motor 12 are arranged in the lead conductor 1. Means for connecting to the pipe line on the side communicating with the tank 25 is provided. This connecting means is provided in the conduit 35b that connects the main conduit 22 and the main conduit 23 and the conduit 35b, and checks the flow of the pressure oil from the main conduit 22 and allows the reverse flow. Provided in the valve 40 and also in the pipe line 35b,
The check valve 41 that blocks the flow of the pressure oil from the main pipe line 23 and allows the reverse flow, and the end of the return pipe line 28 of the jack directional control valve 21 are connected to the check valve 40 and the check valve 41.
And connecting to the portion of the pipe line 35b located between and. The cutter directional control valve 19 is composed of an "H spool", that is, an all-port open type directional control valve.

Further, in the eighth embodiment, the leading conductor 1
Inside the drain pipe 33, connect the end of the drain pipe 33 to the jack directional control valve 2
A drain pump 34, which is connected to the first return line 28 and pumps up the drain oil, is provided in the middle of the drain line 33. Other configurations are, for example, equivalent to those of the first embodiment shown in FIG. 1 described above.

In the eighth embodiment constructed as described above,
As shown in FIG. 11, the cutter directional control valve 19 and the jack directional control valve 21 are held in a neutral position, and the cutter hydraulic motor 12 and the direction correction jack 13 are stopped. When the drain oil is leaking into the casing of the motor 12, the drain oil is driven by the drain pump 34 through the drain conduit 33, the return conduit 28 of the jack directional control valve 21, and the conduit 35b.
It is guided to the check valve 40 and the main pipe 22, and also to the pipe 35b, the check valve 41, and the main pipe 23, respectively, and further discharged from the main pipes 22 and 23 to the tank 25 via the neutral position of the cutter direction switching valve 19. .

Further, when the cutter direction switching valve 19 is held in the neutral state, the cutter hydraulic motor 12 is stopped, the jack direction switching valve 21 is switched, and the direction correcting jack 13 is driven. , Jack directional control valve 2
The return oil guided to the return conduit 28 of No. 1 is guided to the conduit 35b, the check valve 40, and the main conduit 22, and to the conduit 35b, the check valve 41, and the main conduit 23, respectively, and further from the main conduits 22 and 23. It is discharged to the tank 25 through the neutral position of the cutter direction switching valve 19. At this time, when drain oil leaks into the casing of the cutter hydraulic motor 12, the drain oil is driven by the drain pump 34, and the drain oil passage 33 and the return conduit 2 of the jack directional control valve 21.
It is merged with the above-mentioned return oil via 8 and discharged to the tank 25.

Further, the cutter direction switching valve 19 is switched to the left position in FIG. 11, for example, to drive the cutter hydraulic motor 12, the jack direction switching valve 21 is held neutral, and the direction correcting jack 13 is stopped. When the drain oil leaks into the casing of the cutter hydraulic motor 12 when the drain oil is leaking, the drain oil is driven by the drain pump 34 and the drain pipe 33 and the jack directional control valve 21.
Is guided to the return conduit 28, the conduit 35b, the check valve 41, and the main conduit 23, and is discharged from the main conduit 23 to the tank 25 via the left position of the cutter direction switching valve 19. From this state, when the jack directional control valve 21 is switched and the direction correcting jack 13 is also driven,
The return oil guided to the return conduit 28 is discharged to the tank 25 via the conduit 35b, the check valve 41, the main conduit 23, and the left position of the cutter direction switching valve 19.

Similarly, the cutter directional control valve 19 is shown in FIG.
When the hydraulic motor 12 for the cutter is driven to rotate in the opposite direction to the above, the jack directional control valve 21 is held in the neutral position and the direction correcting jack 13 is stopped. When the drain oil leaks into the casing of the cutter hydraulic motor 12, the drain oil is driven by the drain pump 34, and the drain pipe 33, the return pipe 28 of the jack directional control valve 21, the pipe 35b,
It is guided to the check valve 40 and the main conduit 22, respectively, and further discharged from the main conduit 22 to the tank 25 through the right position of the cutter direction switching valve 19. From this state, the jack directional control valve 21 is switched and the direction correcting jack 1
When 3 is also driven, the return oil guided to the return conduit 28 is discharged to the tank 25 via the conduit 35b, the check valve 40, the main conduit 22, and the right position of the cutter direction switching valve 19.

As described above, in the eighth embodiment, the conduits of the main conduits 22 and 23 which communicate with the tank 25 are used as the return conduit of the jack directional control valve 21 and the drain conduit. The hydraulic pipes connecting the front conductor 1 and the ground unit 6 can be reduced by two pipes as compared with the pipe shown in FIG. 15 described above. Therefore, when burying the buried pipe 2 described above, the working time for shutting off and connecting the hydraulic pipe can be shortened as compared with the first embodiment, and the efficiency of the burying work of the buried pipe 2 is improved. It can be further improved.

FIG. 12 is a circuit diagram showing the essential parts of a ninth embodiment corresponding to claims 10 and 11 of the present invention. In the ninth embodiment, similarly to the fifth embodiment shown in FIG. 6 described above, the drain hydraulic motor 35 for driving the drain pump 34 is provided in the front conductor 1, and the cutter direction switching is performed. Driving means is provided for driving the drain hydraulic motor 35 by using the pressure oil in the main pipe lines 22 and 23 connecting the valve 19 and the cutter hydraulic motor 12 as a drive source.

The drive means described above has a conduit 35a and a conduit 35b whose both ends are connected to the main conduits 22 and 23, respectively.
And a check valve 38 provided in the conduit 35a for allowing the flow of pressure oil from the main conduit 22 and blocking the reverse flow, and a flow of pressure oil from the main conduit 23 also provided in the conduit 35a. The check valve 39 for blocking the reverse flow and the conduit 3 for connecting the above-described check valve 38 and the main conduit 22.
The throttle valve 36 provided in the portion 5a and the check valve 3 described above.
9 and the throttle valve 37 provided in the pipe line 35a portion connecting the main pipe line 23, and the check valve 4 provided in the pipe line 35b for blocking the flow of pressure oil from the main pipe line 22 and allowing the reverse flow.
0, a check valve 4 which is also provided in the conduit 35b and blocks the flow of pressure oil from the main conduit 23 and allows the reverse flow.
1 and one end of which is connected to a pipe line 35a located between the check valve 38 and the check valve 39, and the other end of which is connected to one supply / discharge port of the drain hydraulic motor 35.
c, one end of which is connected to the pipe line 35b located between the check valve 40 and the check valve 41, and the other end of which is connected to the other supply / discharge port of the drain hydraulic motor 35.
and d.

The other structure is, for example, equivalent to that of the eighth embodiment shown in FIG. In the ninth embodiment configured in this way, in addition to the same operational effects as the above-described eighth embodiment, the drain oil is positively discharged as the drain hydraulic motor 35 is driven. be able to. That is, the cutter directional control valve 19 is switched to the left position in FIG. 6, and the cutter hydraulic pump 1 is connected to the main pipe line 22.
8 is supplied to drive the cutter hydraulic motor 12, the throttle valve 36 and the check valve 3 in the pipe line 35a.
8. The pressure oil is guided to one of the supply / discharge ports of the drain hydraulic motor 35 via the pipe 35c, and the return oil from the other supply / discharge port is the check valve 41 of the pipe 35d and the pipe 35b.
It flows out to the tank 25 through the main pipe line 23, and the hydraulic motor 35 for drains is driven by this.

The cutter directional control valve 19 is switched to the right position in FIG. 12, and the cutter hydraulic pump 1 is connected to the main pipe line 23.
8 is supplied to drive the cutter hydraulic motor 12, the throttle valve 37 and the check valve 3 in the pipeline 35a are used.
9. Pressure oil is supplied to the drain hydraulic motor 35 via the conduit 35c, and the return oil flows out to the tank 25 via the conduit 35d, the check valve 40 of the conduit 35b, and the main conduit 22.

That is, when the cutter hydraulic motor 12 is driven, the drain hydraulic motor 35 is driven to drive the drain pump 34, whereby the drain oil can be positively discharged to the drain conduit 33. Therefore, when driving the cutter hydraulic motor 12 that is likely to generate drain oil, the drain oil can be discharged in a timely manner.

FIG. 13 is a circuit diagram showing an essential part of a tenth embodiment corresponding to claims 10 and 12 of the present invention. In the tenth embodiment, similarly to the sixth embodiment shown in FIG. 8 described above, a drain hydraulic motor 35 that drives the drain pump 34 is provided in the lead conductor 1, and the jack direction switching is performed. Drive means for driving the drain hydraulic motor 35 using the pressure oil flowing through the return pipe 28 of the valve 21 as a drive source is provided. This drive means is configured by disposing the drain hydraulic motor 35 in the portion of the return pipe 28 located between the connection point between the drain pipe 33 and the return pipe 28 and the jack directional control valve 21. ing. Other configurations are, for example, equivalent to those of the eighth embodiment shown in FIG. 11 described above.

In the tenth embodiment thus constructed, the same operational effects as those of the above-described eighth embodiment can be obtained, and in addition, the return conduit 2 is accompanied by the driving of the direction correcting jack 13.
When the oil returns to 8, the drain hydraulic motor 35 is driven, which drives the drain pump 34, and the drain oil is positively discharged to the drain conduit 33 as in the sixth embodiment described above. Can be made. That is, the drain oil can be discharged when the direction correcting jack 13 that is often operated at the same time when the cutter hydraulic motor 12 is driven, and the drain oil can be discharged at a relatively timing.

FIG. 14 is a circuit diagram showing an essential part of an eleventh embodiment corresponding to claim 13 of the present invention. This eleventh
In this embodiment, similarly to the above-described seventh embodiment shown in FIG. 9, drive means for driving the drain pump 34 in synchronization with the drive of the cutter hydraulic motor 12 is provided. For example, as shown in FIG. 10 described above, this drive means is provided in the cutter drive device 11, and is provided with a cutter drive gear 42 that is rotationally driven, a drain pump drive gear 43 that meshes with the cutter drive gear 42, and a drain pump drive. The shaft 4 that transmits the rotation of the gear 43 as a force for driving the drain pump 34.
3a and 3a. Other configurations are shown in FIG.
This is, for example, equivalent to the eighth embodiment shown in FIG.

In the eleventh embodiment thus constructed, the same operational effect as that of the eighth embodiment described above can be obtained, and the cutter hydraulic motor 12 is operated by the operation of the driving means as in the seventh embodiment. At the time of driving, the drain oil can be positively discharged by driving the drain pump 34.
That is, the cutter hydraulic motor 1 that easily produces drain oil
It is possible to discharge the drain oil in good timing at the time of driving 2.

In any of the eighth to eleventh embodiments described above, the end portion of the return pipe line 28 of the jack directional control valve 21 is connected to the pipe line 35b connecting the main pipe lines 22 and 23 to form a drain. Although the end of the conduit 33 is connected to the return conduit 28, instead of such a configuration, the end of the drain conduit 33 is connected to the conduit 35b in the lead conductor 1 to form a return conduit. The end portion of the passage 28 may be connected to the drain conduit 33.

[0078]

According to the first aspect of the present invention, either the drain conduit or the return conduit of the jack directional control valve is used as both the return conduit and the drain conduit. Therefore, it is possible to reduce the hydraulic pipe connecting the lead conductor and the ground unit by one, compared to the conventional one. Therefore, when burying a buried pipe, the work time for disconnecting and connecting the hydraulic pipe is reduced. Can be shortened compared to
The efficiency of the operation of burying this buried pipe can be improved. Also, since the drain pump that sucks the drain oil in the drain pipe is installed in the ground unit, the drain oil that flows through the drain pipe and the return oil of the jack directional control valve can be satisfactorily guided to the tank by this drain pump. Therefore, stable driving of the direction correcting jack can be ensured, and the hydraulic oil for the cutter is not excessively accumulated in the casing of the hydraulic motor for the cutter, and the hydraulic motor for the cutter is prevented from being damaged by the pressure of the drain oil. be able to.

The invention according to claim 2 of the present invention has the same effect as that of the invention according to claim 1 described above, and the pressure in the drain pipe is equal to or higher than a predetermined pressure for some reason, that is, the cracking of the check valve. When an abnormal situation in which the pressure rises above the pressure level is reached, the check valve is activated and the excess pressure in the drain pipe is released to the atmosphere. It is possible to more reliably prevent damage to the cutter hydraulic motor, which contributes to safety protection of the cutter hydraulic motor and the like.

The invention according to claim 3 of the present invention has the same effect as that of the invention according to claim 1 described above, and the drain pump is driven only when the pressure in the drain conduit exceeds the upper limit value. It is economical because it can save energy.
Further, like the invention according to claim 2 described above, damage to the cutter hydraulic motor due to the pressure of the drain oil can be prevented more reliably, which contributes to safety protection of the cutter hydraulic motor and the like.

In the invention according to claim 4 of the present invention, one of the return pipe line and the drain pipe line of the jack directional control valve can be used as both the return pipe line and the drain pipe line. As compared with the prior art, it is possible to reduce the number of hydraulic lines connecting the front conductor and the ground unit by one, and as a result, when burying a buried pipe, as in the invention according to claim 1 described above, The work time for disconnecting and connecting the hydraulic pipe can be shortened as compared with the conventional one, and the efficiency of the burying work of this burial pipe can be improved.

Further, since the pumping type drain pump is provided in the drain pipe, the drain oil is satisfactorily discharged to the tank through the drain pipe and the return pipe even if the capacity of the drain pump is relatively small. It is possible to form a drain discharge system that is stable in terms of performance and structure.

The invention according to claim 5 of the present invention has the same effect as that of the invention according to claim 4 described above, and the drain oil is positively discharged by driving the hydraulic motor for drain. Can be made.

The invention according to claim 6 of the present invention has the same effect as that of the invention according to claim 5, and in addition, drives the hydraulic motor for drain when driving the hydraulic motor for cutter,
As a result, the drain pump can be driven to positively discharge the drain oil to the drain pipe line. Therefore, when driving the cutter hydraulic motor that is prone to generate drain oil, the drain oil can be discharged with good timing. .

The invention according to claim 7 of the present invention has the same effect as that of the invention according to claim 5 described above, and in addition, when the return oil flows through the return pipe along with the driving of the direction correcting jack. The hydraulic motor for drain is driven, and the drain pump is driven by this, so that drain oil can be positively discharged to the drain conduit 33 as in the case of the invention according to claim 6 described above. That is, the drain oil can be discharged at a relatively good timing when the direction correction jack is driven, which is often operated simultaneously when the cutter hydraulic motor is driven.

According to the invention of claim 8 of the present invention, the same effect as that of the invention of claim 4 can be obtained, and in addition to the invention of claim 6 by the operation of the driving means, a hydraulic motor for a cutter can be provided. The drain oil can be positively discharged by driving the drain pump during driving. That is, the drain oil can be discharged at a good timing when the cutter hydraulic motor that easily produces the drain oil is driven.

According to a ninth aspect of the present invention, in the main pipe line connecting the cutter directional control valve and the cutter hydraulic motor, the pipe line on the side communicating with the tank is connected to the return port of the jack directional control valve. It can also be used as a pipeline and a drain pipeline, and it is possible to reduce the number of hydraulic pipes for connecting the lead conductor and the ground unit by two as compared with the conventional one. Therefore, when burying the above-mentioned buried pipe, The working time for disconnecting and connecting the hydraulic pipe can be shortened as compared with the invention according to claim 1 described above, and the efficiency of the burying work of this buried pipe can be further improved.

The invention according to claim 10 of the present invention has the same effect as that of the invention according to claim 9 described above, and in addition, the drain oil is positively discharged by driving the hydraulic motor for drain. Can be made.

The invention according to claim 11 of the present invention has the same effect as that of the invention according to claim 10 described above, and in addition, the drain hydraulic motor is driven when the cutter hydraulic motor is driven. Can be driven to positively discharge the drain oil to the drain pipe line. Therefore, the drain oil can be discharged at a good timing when the hydraulic motor for the cutter, which is likely to generate the drain oil, is driven.

The invention according to claim 12 of the present invention has the same effect as that of the invention according to claim 10 described above, and in addition, when the return oil flows through the return pipe along with the driving of the direction correcting jack. The hydraulic motor for drain is driven, and the drain pump is driven thereby, so that the drain oil can be positively discharged to the drain conduit as in the invention according to the eleventh aspect. That is, the drain oil can be discharged at a relatively good timing when the direction correction jack is driven, which is often operated simultaneously when the cutter hydraulic motor is driven.

According to the thirteenth aspect of the present invention, the same effect as that of the above-mentioned ninth aspect of the invention can be obtained, and the operation of the drive means causes the same operation of the cutter hydraulic motor as in the eleventh aspect of the invention. When driving, the drain pump can be driven to positively discharge the drain oil. That is, the drain oil can be discharged at a good timing when the cutter hydraulic motor that easily produces the drain oil is driven.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a main part of a first embodiment of a small diameter tube propulsion machine of the present invention.

FIG. 2 is a circuit diagram showing a main part of a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a main part of a third embodiment of the present invention.

FIG. 4 is a circuit diagram showing a main part of a fourth embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing a leading conductor portion of the fourth embodiment shown in FIG.

FIG. 6 is a circuit diagram showing a main part of a fifth embodiment of the present invention.

7 is a vertical cross-sectional view showing a leading conductor portion of the fifth embodiment shown in FIG.

FIG. 8 is a circuit diagram showing a main part of a sixth embodiment of the present invention.

FIG. 9 is a circuit diagram showing a main part of a seventh embodiment of the present invention.

FIG. 10 is a side view showing a cutter driving device portion of the seventh embodiment shown in FIG.

FIG. 11 is a circuit diagram showing a main part of an eighth embodiment of the present invention.

FIG. 12 is a circuit diagram showing a main part of a ninth embodiment of the present invention.

FIG. 13 is a circuit diagram showing a main part of a tenth embodiment of the present invention.

FIG. 14 is a circuit diagram showing a main part of an eleventh embodiment of the present invention.

FIG. 15 is a circuit diagram showing a main part of a conventional small-diameter tube propulsion machine.

FIG. 16 is a side view showing an overall schematic configuration of a conventional small-diameter pipe propulsion device.

FIG. 17 is a vertical cross-sectional view showing a leading conductor portion of the conventional small diameter tube propulsion machine shown in FIG. 16.

[Explanation of symbols]

 1 Front conductor 1A Front body 1B Rear body 2 Buried pipe 3 Starting shaft 4 Starting push jack 5 Ground 6 Ground unit 7 Hydraulic hoses / cables 8 Cutter head 9 Cutter drive shaft 10 Bearing 11 Cutter drive device 12 Cutter hydraulic motor 13 Direction correction jack 14 Thickening agent injection hole 15 Excavated earth and sand 16 Sediment pressure pump 17 Discharge pipe 18 Cutter hydraulic pump 19 Cutter direction switching valve 20 Jack hydraulic pump 21 Jack direction switching valve 22 Main pipe line 23 Main pipe line 24 Drain Pipe line 25 Tank 26 Pressure oil supply pipe line 27 Return pipe line 28 Return pipe line 29 Drain pump 30 Check valve (safety valve) 31 Hydraulic pressure detector 32 Control device 33 Drain pipe line 34 Drain pump 35 Hydraulic motor for drain 35a Pipe line ( Drive means) 35b Pipeline (drive means) 35c Pipeline ( Drive means) 35d Pipe line (drive means) 36 Throttle valve (drive means) 37 Throttle valve (drive means) 38 Check valve (drive means) 39 Check valve (drive means) 40 Check valve (drive means) 41 Check valve (drive) Means) 42 cutter drive gear 43 drain pump drive gear

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Kunihiko Arima, Inventor Hitachi Construction Machinery Co., Ltd.

Claims (13)

[Claims] 1. A cutter head for excavating earth and sand at its tip, a hydraulic motor for a cutter for driving the cutter head, a direction correcting jack for driving a front body, and a direction correcting jack for driving the front body. A lead conductor having a jack directional control valve, a pressure oil supply conduit for guiding pressure oil to the jack directional control valve, a jack hydraulic pump connected to the pressure oil supply conduit, a tank, and A return line for guiding return oil from the jack directional control valve to the tank, at least the pressure oil supply line, a hydraulic pump for the jack, and a ground unit in which the tank is arranged; A small-diameter pipe propulsion machine, comprising: a drain pipe for guiding the drain oil of the cutter hydraulic motor to the tank of the ground unit; The end of one of the return line and the drain line of the directional control valve is
A drain pump that is connected to the other pipeline of the return pipeline and the drain pipeline and that sucks drain oil in the drain pipeline is provided in the middle of the drain pipeline located in the ground unit. A small-diameter tube propulsion machine. 2. A safety valve, one end of which is open to the atmosphere, at a drain conduit portion located between a connection point between the return conduit and the drain conduit of the jack directional control valve and the cutter hydraulic motor. The small diameter pipe propulsion device according to claim 1, further comprising: 3. The oil of the drain pipe line portion is provided at a drain pipe line portion located between a connection point of the return pipe line and the drain pipe line of the jack directional control valve and the cutter hydraulic motor. In addition to providing a hydraulic pressure detector that detects pressure,
Control for comparing a signal value output from this oil pressure detector with a preset oil pressure upper limit value and outputting a control signal for activating the drain pump when the signal value exceeds the oil pressure upper limit value. The small diameter pipe propulsion device according to claim 1, further comprising a device. 4. A cutter head for excavating earth and sand at the tip, a hydraulic motor for a cutter for driving the cutter head, a direction correcting jack for driving the front body, and a direction correcting jack for driving the front body. A lead conductor having a jack directional control valve, a pressure oil supply conduit for guiding pressure oil to the jack directional control valve, a jack hydraulic pump connected to the pressure oil supply conduit, a tank, and A return line for guiding return oil from the jack directional control valve to the tank, at least the pressure oil supply line, a hydraulic pump for the jack, and a ground unit in which the tank is arranged; A small-diameter pipe propulsion machine, comprising: a drain conduit for guiding drain oil of the cutter hydraulic motor to the tank of the ground unit; And an end of one of the return pipes of the jack directional control valve is connected to the other of the drain pipe and the return pipe, and the connection point and the hydraulic pressure for the cutter are connected. A small-diameter pipe propulsion device, characterized in that a drain pump for pumping drain oil is provided in a drain pipe portion located between the motor and the motor. 5. The small-diameter pipe propulsion device according to claim 4, wherein a hydraulic motor for a drain that drives the drain pump is provided in the leading conductor. 6. A cutter hydraulic pump for supplying pressure oil for driving the cutter hydraulic motor and a flow of pressure oil supplied from the cutter hydraulic pump to the cutter hydraulic motor in the ground unit. A cutter directional control valve for controlling is provided, and drive means for driving the drain hydraulic motor is provided by using the pressure oil in the main pipe line connecting the cutter directional control valve and the cutter hydraulic motor as a drive source. The small diameter pipe propulsion device according to claim 5, wherein 7. A drive means for driving the drain hydraulic motor using pressure oil flowing in a return pipe of the jack directional control valve as a drive source.
Small diameter tube propulsion machine described. 8. The small diameter pipe propulsion device according to claim 4, further comprising drive means for driving the drain pump in synchronization with the drive of the cutter hydraulic motor. 9. A cutter head for excavating earth and sand at its tip, a hydraulic motor for a cutter for driving the cutter head, a direction correcting jack for driving a front body, and a direction correcting jack for driving the front body. A lead conductor having a jack directional control valve, a pressure oil supply conduit for guiding pressure oil to the jack directional control valve, a jack hydraulic pump connected to the pressure oil supply conduit, a tank, and A return conduit for guiding the return oil from the jack directional control valve to the tank, a cutter hydraulic pump for supplying pressure oil for driving the cutter hydraulic motor,
A cutter directional control valve for controlling the flow of pressure oil supplied from the cutter hydraulic pump to the cutter hydraulic motor, and a main pipe line connecting the cutter directional control valve and the cutter hydraulic motor. , A ground unit in which at least the pressure oil supply pipe line, the jack hydraulic pump, the tank, the cutter hydraulic pump, and the directional switch valve for the cutter are arranged, and a drain for the hydraulic motor for the cutter. In a small-diameter pipe propulsion machine equipped with a drain conduit for guiding oil to the tank of the above-ground unit, one of the return conduit of the jack directional control valve and the drain conduit in the lead conductor. Means is provided for connecting the end of the passage to one of the main pipelines that is in communication with the tank, and the return pipeline and the drain are arranged in the lead conductor. A small-diameter pipe characterized in that a drain pump for pumping drain oil is provided in the middle of the drain pipe located in the leading conductor by connecting the end of the other pipe of the pipe to the one pipe. Propulsion machine. 10. The small-diameter pipe propulsion device according to claim 9, further comprising a drain hydraulic motor for driving the drain pump. 11. The small diameter pipe propulsion device according to claim 10, further comprising drive means for driving the drain hydraulic motor using the pressure oil in the main pipe line as a drive source. 12. The small-diameter pipe according to claim 10, further comprising drive means for driving the drain hydraulic motor by using the pressure oil flowing in the return pipe of the jack directional control valve as a drive source. Propulsion machine. 13. The small diameter pipe propulsion device according to claim 9, further comprising drive means for driving the drain pump in synchronization with the drive of the cutter hydraulic motor.