JPS6227595Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an operation control device for a pipe propulsion buried device;
Specifically, the present invention relates to an operation control device for controlling the operation of a tube propulsion device that propels and buries a tube underground.

Conventionally, as shown in FIG. 1, for example, as shown in FIG. 1, a pushing cylinder 2 is provided in a starting pit 1, and the pushing cylinder 2 pushes a tubular body 4 underground using a propelling body 3 as a guide. It is known that the propulsion body 3 has a propulsion cylinder 6 equipped with a propulsion head 5, as shown in FIG.
It consists of a pair of swing cylinders 7, 7 for swinging the propulsion cylinder 6, the propulsion cylinder 6 is extended to advance the propulsion head 5 into the ground, and then the pushing cylinder 2 is pushed in, The subsequent tube bodies 4 are propelled and buried while the propulsion cylinder 6 is contracted, and the tube bodies 4 are successively buried by repeating the operation of expanding the propulsion cylinder 6 again. When the pipe body 4 to be buried is bent due to soil quality, etc., the swing cylinders 7, 7 are used to straighten the pipe body 4, or to bend the pipe body 4 to be buried in a desired direction. By expanding and contracting, swinging the propulsion cylinder 6 to tilt it in a desired direction, and repeating the above-mentioned operation, the pipe body 4 to be buried is straightened or bent in a desired direction and buried. It is.

Hydraulic pressure is supplied to the propulsion cylinder 6 and the swing cylinder 7 through a hose passing through the pipe body 4.
The hydraulic pressure is supplied from a hydraulic power source provided in the starting pit 1 and controlled by a control device 8'. This is because providing a hydraulic power source within the propellant 3 would be disadvantageous in terms of space and maintenance and inspection.

As mentioned above, the propulsion cylinder 6 needs to be extended to propel the propulsion body 3 into the ground, so the hydraulic pressure P ₁ acting on the propulsion cylinder 6 is high pressure (500
Kg/cm ² ), and since the swing cylinder 7 only tilts the propulsion cylinder 6 as described above, the hydraulic pressure P ₂ acting on the swing cylinder 7 is a low pressure (210 kg/cm 2 ).
Kg/cm ² ), and therefore, as shown in FIG.
Propulsion cylinder 6 via two hoses 11, 12
The oil discharged from the other hydraulic power source 9 is supplied to the pair of swing cylinders 7, 7 via two hoses 13, 14 and electromagnetic switching valves 15, 15 provided in the propellant 3.
The supply is controlled.

In the conventional hydraulic circuit configured in this way, four hoses 11, 12, 13, 14 are provided in the pipe body 4.
and a plurality of electric wires, the target 16 provided at the rear of the propellant 3 as shown in FIG.
The problem is that visibility is poor, making it impossible to accurately adjust the direction of propulsion or direction of propulsion. In addition, the pipe body 4
Since hoses of unit length are successively propelled and buried, each hose 11, 12, 13, 1
4 has to be lengthened sequentially, and for this purpose a joint (not shown) is provided and the hoses are added sequentially through this joint, but since there are a large number of hoses, the operation is troublesome.

The present invention was devised in view of the above circumstances, and it is possible to supply hydraulic pressure to the propulsion cylinder and the swing cylinder with only two hoses, and it is possible to supply hydraulic pressure to the propulsion cylinder and the swing cylinder with only two hoses.
It is an object of the present invention to provide an operation control device for a tube propulsion buried device which has a simple structure.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.

The discharge side 18 of the hydraulic power source 17 is connected to first and second pipe lines 20 and 21 through a main switching valve 19, and the first and second pipe lines 20 and 21 are connected to a third pipe line through an auxiliary switching valve 22. - Connected to the fourth pipe lines 23 and 24, the first pipe line 20 and the third pipe line 23 are short-circuited by a bypass line 27 equipped with a check valve 25 and a variable throttle 26, and the second pipe line The passage 21 and the fourth conduit 24 are short-circuited by a bypass passage 30 provided with a check valve 28 and a variable throttle 29. Further, a high pressure relief valve 31 is provided on the discharge side 18 of the pump 17, and a low pressure relief valve 32 is provided on the fourth pipe line 24, respectively.

Each of the above members is provided within the starting pit 1.
The third pipe line 23 and the fourth pipe line 24 are connected to first and second hoses 33 and 34 arranged inside the pipe body 4, and these first and second hoses 33 and 34 leave the joint. At the same time, the length can be adjusted by connecting a new hose.

The first and second hoses 33 and 34 are connected to the first and second chambers 6a and 6b of the propulsion cylinder 6 via fifth and sixth conduits 35 and 36 arranged inside the propulsion body 3. At the same time, the electromagnetic switching valve 1 of each swing cylinder 7 is connected via a seventh pipe line 37 branched from the sixth pipe line 36.
5 and 15, and is connected to the electromagnetic switching valves 15 and 15 of each swing cylinder 7 via an eighth pipe line 38 branched from the fifth pipe line. Also, the eighth
The conduit 38 is provided with a check valve 39 that allows return oil from the electromagnetic switching valve 15 to flow, and an accumulator 40, and the seventh conduit 37 is provided with a filter 41 and a variable throttle 42. It is provided.

Next, the operation will be explained.

When the main switching valve 19 is set to the pushing position from the state shown in FIG.
8, first pipe line 20, third pipe line 23, first hose 3
3. It flows into the first chamber 6a through the fifth conduit 35, advances the movable part 6c, and pushes out the propulsion head 5. At this time, the hydraulic pressure in the second chamber 6b is
6, second hose 34, fourth pipe line 24, second pipe line 2
After step 1, drain into the tank. Note that the pressure in the first chamber 6a at this time becomes the set pressure P ₁ (500 Kg/cm ² ) of the high pressure relief valve 31.

Furthermore, when the auxiliary switching valve 22 is set to the shutoff position and the main switching valve 19 is set to the return position from the state shown in FIG. The second pipe passes through the stop valve 28, the fourth pipe line 24, the second hose 34, and the sixth pipe line 36.
The movable portion 6c is supplied to the chamber 6b and makes a double return motion. At this time, the oil pressure in the first chamber 6a drains into the tank via the fifth pipe line 35, the first hose 33, the third pipe line 23, the bypass line 27, the variable throttle 26, and the first pipe line 20. This return movement of the movable part 6c is caused by the propulsion head 5
Since this is a follow-up operation, a low pressure is sufficient. Therefore, in this case as well, the fourth pipe line 24 is at the set pressure P ₂ (210 Kg/cm ² ) of the low pressure relief valve 32, and
The pressure inside the second chamber 6b is also low, and the electromagnetic switching valve 1
5 is also supplied with low pressure via the seventh pipe 37, so by switching the electromagnetic switching valve 15,
The swing cylinders 7, 7 can be expanded and contracted appropriately. The return oil at that time passes through the eighth pipe line 38 to the fifth pipe line 3.
It joins No. 5 and drains into the tank.

Note that the check valve 39 provided in the eighth pipe line 38
This is to prevent the high pressure oil in the fifth pipe line 35 from reaching the accumulator 40 and the electromagnetic switching valve 15.

Further, when the auxiliary switching valve 22 is set to the cutoff position and the main switching valve 19 is set to the pushing position from the state shown in FIG.
8, first pipe line 20, bypass line 27, check valve 2
5, third pipe line 23, first hose 33, fifth pipe line 3
5 to the first chamber 6a to push the movable part 6c, and the hydraulic pressure in the second chamber 6b is supplied to the sixth pipe line 36, the second hose 34, the bypass line 30, the variable throttle 29,
Because back pressure is generated in the sixth conduit 36 due to draining through the second conduit 21, this back pressure is generated in the seventh conduit 36.
Hydraulic pressure is also supplied to the electromagnetic switching valves 15, 15 through the pipe 37, and therefore, by switching the electromagnetic switching valves 15, 15, the swing cylinders 7, 7
It can be expanded and contracted appropriately. At that time, the return oil of the swing cylinders 7, 7 is
0, and when the movable part 6c follows the propulsion head 5 as described above, the fifth conduit 3
When communicating with the tank No. 5, the water flows from the accumulator 40 to the fifth pipe line 35 and drains into the tank.

In this way, the oil discharged from one hydraulic source 17 is transferred to the main switching valve 19, the auxiliary switching valve 22, the electromagnetic switching valve 15,
By switching the actuator 15, the propulsion cylinder 6 and the swing cylinders 7, 7 can be expanded and contracted appropriately. In this case, there are two hoses in the pipe body 4.

Since the operation control device for the pipe body propulsion burial device according to the present invention is configured as described above, only one hydraulic power source 17 and two hoses are provided.
The propulsion cylinder 6 and the swing cylinders 7, 7 can be expanded and contracted appropriately to control the propulsion body 3. Therefore, the visibility of the target is improved, the hose connection operation is simple, and the structure is simple. It is inexpensive.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram of the pipe propulsion burial device, Figure 2
3 is a sectional view of the propelling body, FIG. 3 is an operation control device thereof, FIG. 4 is a diagram illustrating the installation of a target, and FIG. 5 is a diagrammatic diagram illustrating an embodiment of the present invention. 1 is a starting pit, 3 is a propulsion body, 4 is a pipe body, 6 is a propulsion cylinder, 7 is a rocking cylinder, 15 is an electromagnetic switching valve, 17 is a hydraulic pressure source, 18 is a discharge side, 19 is a main switching valve, 20 is a A first pipe line, 21 a second pipe line, 22 an auxiliary switching valve, 23 a third pipe line, 24 a fourth pipe line,
25, 28 are check valves, 26, 29 are variable throttles, 2
7 and 30 are bypass passages, 32 is a low pressure relief valve,
33 is the first hose, 34 is the second hose, 35 is the fifth pipe line, 36 is the sixth pipe line, 37 is the seventh pipe line, 38
39 is a check valve, and 40 is an accumulator.

Claims (1)

[Scope of utility model registration request] In the starting pit 1, a hydraulic power source 17 and a hydraulic power source 1 are provided.
a main switching valve 19 that selectively connects the discharge side 18 of 7 to either the first or second pipe line 20 or 21;
an auxiliary switching valve 22 that communicates and shuts off the first conduit 20 to the third conduit 23 and the second conduit 21 to the fourth conduit 24; and the first conduit 20 and the third conduit 24. variable throttles 26 and 29 for short-circuiting between the line 23 and between the second line 21 and the fourth line 24, respectively; and a check valve 25 that allows the oil discharged from the hydraulic power source 17 to flow. , 28, a high pressure relief valve 31 provided on the discharge side 18 of the hydraulic power source 17, and a low pressure relief valve 32 provided on the fourth pipe line 24, The first and second hoses 33 and 34 are connected to the third and fourth pipes 23 and 24, respectively, and the first hose 33 and the second hose 34 are connected to each other.
Fifth and sixth pipes 35 and 36 arranged in the propellant 3
The first and second chambers 6a, 6 of the propulsion cylinder 6 via
b, and the sixth conduit 36 is connected to the propellant 3.
It is connected to the inlet side of the electromagnetic switching valves 15, 15 of the rocking cylinders 7, 7 via a seventh pipe line 37 disposed inside the accumulator 40. and the electromagnetic switching valve 1
Check valve 3 that allows return oil to flow from 5 and 15
9. An operation control device for a pipe propulsion burial device connected to the fifth pipe line 35 via an eighth pipe line 38 having 9 and 9, respectively.