JPH0160638B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an underground propulsion drilling machine for laying pipes.
When laying a conduit in the soil, there is a method that involves excavating to a specified depth from the ground and burying the conduit, or a construction method that does not involve excavating from the ground and providing an appropriate pit, or a method that does not require the provision of a pit due to the topography. By the way, a construction method is used in which pipes are sequentially laid by excavating or perforating holes in a predetermined direction from one of the pipes.

When excavating large-diameter tunnels such as vehicle tunnels and waterway tunnels, the excavation equipment can be carried to the excavation position and pipes can be laid in a predetermined direction with high precision. On the other hand, when installing small-diameter pipes, it is necessary to excavate the soil or operate the perforating device from a remote location, which makes it difficult to form holes in a specific direction and install the pipes. It comes with this.

When installing small-diameter pipes such as electric cables, water pipes, and gas pipes in the soil, the present invention allows the drilling machine to be pushed into the soil and propelled without taking any means of excavating or discharging earth and sand. This invention relates to an underground propulsion drilling machine for laying pipelines, which is used in a construction method in which pipelines are laid one after another while moving.

[Technical background]

Figure 1 shows an outline of the construction method using an underground propulsion drilling machine. A pit P is dug into the ground, and a pushing device 3 is installed in the pit P together with a reaction plate 4 for the pushing device. Reference numeral 1 denotes a main body of the propulsion drilling machine, and 11 is a movable outer cylinder of the main body 1 of the propulsion drilling machine, and only the movable outer cylinder 11 having a head 10 can be press-fitted and propelled in the direction of the arrow by hydraulic pressure. The partial pipe 2 in the ground shows a partial pipe that has been pushed into a hole that has already been drilled. Hydraulic hoses 7', 7'', and 7 are connected from a hydraulic power source 5 to the propulsion drilling machine body 1 and the pushing device 3, respectively, via the operation panel 6.

Now, in the state shown in the figure, the propulsion drilling machine main body 1
If hydraulic pressure is applied from the operation panel 6 to energize the outer cylinder 1,
Only No. 1 can be pushed into the soil in the direction of the arrow by using the frictional resistance with the earth and sand of the partial pipe 2 and the reaction force plate 4 for the pushing device as a point of force. After the movable outer cylinder 11 is pushed forward with a certain stroke, the hydraulic pressure is reduced and the pushing device 3 is energized by the operation panel 6, so that the partial pipes 2 successively laid in the ground are pushed forward. Since the propulsion drilling machine main body 1 located at the tip of these partial pipes 2 is deenergized,
It moves forward in the direction of the head 10 that has already been pushed forward, and can be moved forward through the soil by the stroke pushed by the movable outer cylinder 11 as a whole. During such advancement, the partial pipes 2
By adding the above from the position of the pushing device 3, the conduit can be laid. In addition, as a similar construction method, the propulsion drilling machine body 1 itself does not have a movable mechanism for partially propelling it as described above, and the partial pipe line 2 is placed behind the propulsion drilling machine body 1 from the position of the pit P. There is also a method in which the pipe is lengthened by pushing in one after another using the pushing device 3, but according to this method, as the pipe gradually becomes longer, the drilling work point becomes remote. This will give a pushing force to the propulsion drilling machine body from the position,
Since this will result in a loss in pushing force, the method already described is preferable.

Applicants of this application first comply with the above-mentioned construction method,
The main body of the propulsion drilling machine is equipped with its own pitching angle, rolling angle, and horizontal angle detector, and a mechanism is provided that can appropriately change the pushing direction of the head of the movable outer cylinder 11 of the main body 1 of the propulsion drilling machine based on these various information. Patent application 115725 (1983) for underground propulsion drilling equipment for laying pipelines.
I proposed it in the issue.

FIG. 2 shows an example of the main body of the propulsion drilling machine explained in the above application, and FIGS. 3 and 4 show a direction control fitting 22 supported by the head 10 and the inner cylinder 20.
Indicates the engagement relationship with.

In FIG. 2, the head 10 is made of a hard metal body, for example, a molded body made of cemented carbide powder alloy. In this example, the portion pushed into the soil has a disk shape, but other shapes may be used, and an appropriate shape is selected depending on the soil quality.

A spherical portion formed on the head 10 and a movable outer cylinder 11
Since the protrusion 12 is fitted into the recess formed in the diameter device of the spherical portion of the head 10, the disk surface of the head 10 is engaged with the spherical recess formed at the tip of the movable outer cylinder 11. Although the direction can be changed within a certain range with respect to the axis, it is engaged so as not to rotate about the axis.

An inner cylinder 20 is slidably fitted inside the movable outer cylinder 11 , a rear outer cylinder 13 is slidably fitted behind it, and the end of the rear outer cylinder 13 is connected to the end of the movable outer cylinder 11 . Extends backwards beyond the section.

The movable outer cylinder 11 and the inner cylinder 20 are connected by a protrusion 21,
They can move axially, but are prevented from rotating relative to each other. Further, the movable outer cylinder 11 and the rear outer cylinder 13 partially overlap and are movable in the axial direction by the projections 14 and corresponding grooves, but are prevented from rotating relative to each other. Furthermore, the space between the movable outer cylinder 11 and the rear outer cylinder 13 is sealed by a seal 15.

A hydraulic cylinder 16 is fixed inside the rear outer cylinder 13, and the piston rod of the hydraulic cylinder 16 is connected to the inner cylinder 2.
0 is fixed to the bottom of one side. Hydraulic cylinder 16
is connected to a hydraulic pipe 17, and the other end of the hydraulic pipe 17 is connected to equipment on the ground by a hydraulic hose 7'. 18 is a hydraulic swing actuator fixed within the inner cylinder 20 and connected to the hydraulic pipe 19.
Although only one hydraulic pipe 19 is shown in the figure, two are usually arranged and connected to the hydraulic sliding actuator 18, and the other end of the hydraulic pipe 19 is connected to equipment on the ground by a hydraulic hose 7.

Reference numeral 22 denotes a direction control fitting attached to the rotating shaft of the swinging actuator 18, which rotates integrally with the shaft of the swinging actuator when the hydraulic sliding actuator 18 is hydraulically biased. 2
3 is a spring press-fitted between a recess formed in the center of the back of the head 10 and a recess formed in the center of the front of the direction control fitting 22, which will be described later.
Hydraulic cylinder 1 for swing actuator 18
When no force is applied by the hydraulic pressure from 6 or the pushing device 3, the front surface of the direction control fitting 22 facing from the back side of the head 10 has a length L.
The front surface of the protruding direction control fitting 22 is held in an unobstructed state even when rotated by operating the swing actuator 18. Back side of head 10 and direction control fittings 22
The shapes of the front surfaces of the two are shown in FIGS. 3 and 4, respectively. According to this and FIG. 2, 24 is a concave portion provided on the head 10 side, 25 is a convex portion provided on the head 10 side, and the slope of the convex surface is the slope 29 of the opposing direction control fitting 22. is taken to be the same as the angle of inclination of 26 is a flat part provided on the head 10 side, 27 is a convex part provided on the direction control fitting 22 side corresponding to the recess 24, and 28 is also provided on the direction control fitting 22 side. Hirabe, 29
is an inclined portion, and 30 is a recessed portion.

The engagement state and effects of the head 10 and the direction control fitting 22 will be described later.

31 is a potentiometer installed behind the swing actuator 18, and its rotation shaft 35
rotates in conjunction with the axis of the direction control fitting 22. 32 is an inclination angle detector installed in the rear outer cylinder 13, and the rotation axis 32 is always in the vertical direction.
3, and the so-called pitching angle is detected. 34 is a potentiometer engaged with the rotating shaft 33 of the tilt angle detector 32, and a so-called rolling angle is detected.

In addition, although not shown, a small gyro device is installed in the rear outer cylinder, and when the propulsion drilling machine main body 1 deviates from the horizontal direction, it converts the deviation into an electrical signal.

Therefore, the operator considers the pitching angle, rolling angle, and horizontal angle of the propulsion drilling machine body 1 shown on the display 8 and operates the swing actuator 18 to adjust the head 10 during soil thrust propulsion.
set in a predetermined direction. As already mentioned, when the hydraulic cylinder 16 is in a state of reduced force, the distance L is maintained by the force of the spring 23.

As described above, the swing actuator 18 can rotate the direction control fitting 22 attached to its shaft by adjusting the hydraulic pressure through the two hydraulic pipes 19.
This rotation angle is determined by the potentiometer 31 and the display 8.
direction control fitting 22 from this angle.
The position of the convex portion 27, that is, the direction in which the head 10 is set can be known. If it is determined that the direction control fitting 22 is going straight, check the rotational position of the direction control fitting 22 from the potentiometer 31 on the display 8.
Rotate the convex portion 27 on the front side of the direction control fitting 22.
and the inclined portion 29 and the recessed portion 24 on the back surface of the head 10.
and the convex portion 25, and if the direction needs to be changed, similarly rotate the direction control fitting 22 to bring the convex portion 27 to a predetermined position.

Then, the pushing device 3 pushes forward the pipe line between the pushing device 3 and the propulsion drilling machine main body 1, using the reaction force plate 4 as a point of force.

Next, when the hydraulic cylinder 16 is energized by the operation panel 6, the piston rod of the hydraulic cylinder 16 is pushed forward, thereby advancing the inner cylinder 20. In the case of straight movement, the convex part 27 fits into the concave part 24, and the flat part 26 is in contact with the flat part 28, and the convex part 25 is in contact with the inclined part 29 with the same inclination, so that the disk surface of the head 10 remains perpendicular to the axis of the inner cylinder 20, and the direction needs to be changed. In this case, the convex part 27 touches the flat part 26 and pushes, the head 10 is tilted and the inclined part 29 comes into contact with the flat part 26, and the disk surface of the head 10 is perpendicular to the axis of the propulsion drilling machine body 1. The head 10 is inclined from the direction and has its drilling direction.
Due to the inclination, a difference in earth pressure resistance occurs in the front, and the course of the entire propulsion drilling machine is adjusted.

As the stroke of the piston rod of the hydraulic cylinder 16 increases, it becomes integral with the movable outer cylinder 11.
It is buried in the soil for the length of the stroke and is propelled.

After deenergizing the hydraulic cylinder 16, the direction control fitting 22
The spring 23 returns to a position with a good distance L between the springs 23, and the next direction adjustment becomes possible.

By the way, as can be understood from the above explanation, in the soil propulsion drilling machine main body 1, the hydraulic swing actuator 18 is located immediately behind the direction control fitting 22.
and a direction control fitting 22 are combined, and when hydraulic pressure is applied to the hydraulic cylinder 16, the hydraulic swing actuator 18 is pushed forward together with the inner cylinder 20, and as the pressure is reduced, the spring 23 causes the hydraulic swing actuator 18 to be pushed forward. Only L is returned, but rather than providing a hydraulic swing actuator 18 in such a cylinder movable part and configuring a movable part that includes this hydraulic swing actuator 18, this can be fixed and arranged, and the direction control fitting It goes without saying that it would be convenient if 22 were given the ability to rotate.
The problem of expansion and contraction of the hydraulic piping 19 and the like in a narrow space, which occurs when the hydraulic swing actuator 18 moves back and forth, is also eliminated.

[Disclosure of the invention]

In view of the above-mentioned points, the present invention connects a direction control fitting to the rod of a hydraulic cylinder equipped with a rotary piston rod, connects the spline shaft of the rotary piston rod and the rotation shaft of a hydraulic swing actuator, and performs direction control. The rotation of the metal fitting is caused by the rotation of the hydraulic swing actuator, via the spline shaft, and the piston rod, and the advancement of the direction control fitting is caused by the advancement of the piston rod by hydraulic pressure, similar to the previously described underground propulsion drilling machine body 1. It is configured to perform its functions.

〔Example〕

FIG. 5 shows an embodiment of the present invention.

At the tip of the movable outer cylinder 11, the front surface is a disc surface,
A head 10 whose support portion is spherical is engaged. The protrusion 12 fits into the recess provided at the diameter of the spherical part, and the disk surface of the head 10 is aligned with the axis of the movable outer cylinder 11.
The direction can be adjusted within a certain range. However, it cannot be rotated about the axis. An outer cylinder of a hydraulic cylinder 40 is fitted inside the movable outer cylinder 11, and an axial groove 41 formed on the inner wall of the movable outer cylinder 11
and the projection 42 on the outer cylinder surface of the hydraulic cylinder 40,
The movable outer cylinder 11 can slide only in the axial direction of the hydraulic cylinder 40. In addition, 43 is the movable outer cylinder 1
1 and the outer cylinder of the hydraulic cylinder 40.

A piston rod 44 is fitted into the hydraulic cylinder 40. Then, a spline shaft 45 is fitted into the inner hole of the piston rod 44. Although the spline shaft 45 and the piston rod 44 are movable in the mutual axial direction, they rotate together.
46a and 46b are hydraulic piping for the hydraulic cylinder 40, and the piston rod 44 is extended by supplying oil to the hydraulic piping 46a, and the piston rod 44 is extended to the hydraulic piping 46b.
The piston rod 44 is retracted by supplying oil to the piston rod 44. 4
7 is a rear outer cylinder, and this rear outer cylinder 47 is integrated with a hydraulic cylinder 40, and inside this rear outer cylinder 47, a hydraulic swing actuator 48 is connected to the shaft 4.
9 are connected to each other in alignment with the axis of the spline shaft 45, and the hydraulic swing actuator 48 itself is fixed to the outer cylinder 47. Reference numeral 50 denotes a hydraulic piping for the swing actuator 48. Only one is shown in the figure, but normally there are two. The swing actuator 48 rotates when oil is supplied, and the piston rod 44 connected to it is splined. Rotates via axis 45. 51 is a potentiometer;
A rotation shaft of the potentiometer is connected to the shaft 49 of the swing actuator 48, and detects the rotation angle of the direction control fitting 22.

Further, 52 is a potentiometer whose rotating shaft 53 is connected to the rotating shaft of a weight 54 which is rotatably supported by a support, and detects the rolling angle of the main body of the propulsion drilling machine.

Although not shown, a pitching angle detector,
Built-in gyroscope, etc.

Although it has already come loose a little, the swing actuator 48
By energizing the piston rod 44 and the spline shaft 45 of the hydraulic cylinder 40, the piston rod 44 and the spline shaft 45 can rotate together.
The direction control fitting 22 fixed to the tip of the directional control fitting 22 also rotates accordingly.

Next, when the hydraulic cylinder 40 is energized, only the piston rod 44 extends, and the direction control fitting 22
comes into contact with the back surface of the head 10, and if the piston rod 44 further extends, the head 10, which is integral with the movable outer cylinder 11, will be pushed forward.

The spline shaft 45 for the piston rod 44 has at least one peak removed from the surface that fits into the inner hole of the piston rod 44, so that oil can easily flow into and out of the inner hole of the piston rod 44 through the gap. Become. For this reason,
Particularly in the case of pushing (extending the piston rod 44), the pressure receiving area of the piston rod does not decrease and can be used effectively without waste.

The joint end surface of the direction control fitting 22 with the head 10 is formed by a convex part 55, a flat part 56, an inclined part 57, and a recess 58, while the joint end surface on the head 10 side is formed by a concave part 5.
9, it is formed of a flat part 60, a convex part 61, and a flat part 62, and the inclination angle of the convex part 61 matches that of the inclination part 57.

For example, if both end surfaces are in contact with each other in the facing position as shown in the figure, the disk surface of the head 10 will be held in a direction perpendicular to the axis of the main body, but the direction control fitting 22 will not be connected to the swing actuator 48. When the disc is rotated by a predetermined amount, the direction of the disk surface is adjusted so that it forms a predetermined angle with respect to the axis of the main body.

The rotational position of this direction control fitting 22 is controlled by a potentiometer 51, and signals such as pitching and rolling of the main body itself in the ground are all controlled on the ground surface as shown in Fig. 1, and the operating hydraulic pressure is also controlled in the same place. will be supervised by

FIG. 6 explains the working procedure using the propulsion drilling machine of the present invention.

is an initial state, and shows a state in which the direction control fitting 22 is aligned in a predetermined direction.

2 shows a state in which the piston rod 44 of the hydraulic cylinder 40 is extended.

After retracting the piston rod 44, the direction bracket 2
2 is shown in a predetermined position.

shows the state in which it is pushed by the pushing device 3 (FIG. 1).

The above steps...
,, and so on repeatedly.

〔effect〕

As explained above, using the underground propulsion drilling machine according to the present invention, the current situation during drilling, the direction to be drilled in the future, etc. are detected as shown in Fig. As shown in the figure, it goes without saying that it is possible to detect on the ground surface and remotely control the hydraulic equipment provided in the main body itself, but in the present invention, a hydraulic cylinder fitted with a spline shaft that allows reciprocating and rotational movement of the piston rod and a rocker are used. Due to the internal drive structure of the main body that connects the dynamic actuator, unlike the previously proposed propulsion drilling machine, there is no need to move the swing actuator itself together with the inner cylinder.
Since only the piston rod and the movable outer cylinder are configured to extend and contract, the structure is simplified, and the swing actuator is freed from the restriction of being mounted in a limited inner cylinder space.

As described above, the main body of the underground propulsion drilling machine of the present invention has a simple structure, and is expected to have a great effect on improving the work efficiency of pipeline installation work as described above.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conduit installation method using an underground propulsion drilling machine for conduit installation. FIG. 2 is a sectional view of an example of a previously proposed underground propulsion drilling machine for laying pipelines. Figures 3 and 4 are from Figure 2 A-A and B.
It is a sectional view at -B. FIG. 5 is a sectional view of one embodiment of the present invention. FIG. 6 is an operational diagram of the propulsion drilling machine of the present invention. DESCRIPTION OF SYMBOLS 1... Propulsion drilling machine main body, 2... Partial pipe line, 3... Pushing device, 4... Pressure plate of pushing device, 5... Hydraulic power source,
6...Operation panel, 7...Hydraulic hose, 8...Display, 9...
Cable, 10...head, 11...movable outer cylinder, 13...
Rear outer cylinder, 16... Hydraulic cylinder, 17, 19... Hydraulic piping, 18... Hydraulic swing actuator, 20...
Inner cylinder, 22...Direction control fitting, 40...Hydraulic cylinder, 41...Groove on the inner wall surface of the movable outer cylinder, 42...Protrusion on the outer wall of the hydraulic cylinder, 44...Piston rod of the hydraulic cylinder, 45...Fitting in the inner hole of the piston rod spline shaft, 46a, 46b...hydraulic piping,
47... Rear outer cylinder, 48... Hydraulic swing actuator, 49... Shaft of hydraulic swing actuator,
51, 52... Potentiometer, 54... Weight.

Claims (1)

[Claims] 1. A movable outer cylinder is slidably fitted into a hydraulic cylinder equipped with a spline shaft that is fitted in at least an inner hole of the piston rod, and the rear surface of a head whose direction can be adjusted and which is engaged with the tip of the movable outer cylinder and the piston rod. A directional control fitting attached to the tip of the piston rod is connected to a shaft of a hydraulic swing actuator that fixes a spline shaft that fits with the piston rod behind the hydraulic cylinder. Soil propulsion drilling machine.