JPS6153518B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an underground propulsion drilling device for laying pipes.

[Prior art and problems] When laying a conduit in the ground, there is a method of excavating and burying the conduit to a predetermined depth from the ground; Where there is no need to provide a pit,
A construction method is used in which pipes are sequentially laid by excavating or perforating holes in a predetermined direction from one side.

When excavating large-diameter tunnels such as vehicle tunnels and waterway tunnels, the excavation equipment can be carried to the excavation location, and pipes can be efficiently laid in a predetermined direction. 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. This is a matter of concern.

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 device for laying pipes, which is used in a construction method in which pipes are sequentially laid while moving.

Figure 1 shows an outline of the construction method using such an underground propulsion drilling device. A pit P is dug into the soil, and a pushing device 3 is installed in the pit P with a reaction force plate 4 for the pushing device.
It will be installed with 1 is a propulsion drilling machine main body, 11 is a movable outer cylinder of the propulsion drilling machine main body 1,
Only the movable outer cylinder 11 having the 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. 7' and 7'' are respectively connected to the propulsion drilling machine body 1 from the hydraulic power source 5 via the operation panel 6.
and a hydraulic hose connected to the pushing device 3.

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
The pipe can be laid by adding the screws from the position of the pushing device 3. 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.

By the way, the present invention is directed to a device for drilling a hole in the soil by partially pushing the movable outer cylinder equipped with a drilling tool in the above-mentioned propulsion drilling machine main body 1. It is normal for some parts to be hard and some to be soft. For example, when trying to lay a pipeline in a straight line, simply move the head 10 of the propulsion drilling machine main body 1 to the ground in front of the ground. If you just push it inside and propel it,
Straightness in the pipeline cannot be maintained.

From this point of view, as shown in Japanese Patent Publication No. 50-3128, the tip of the movable outer cylinder of the propulsion drilling machine body 1 is made into a spiral blade, and when the head 10 is pushed forward, it rotates and moves in a straight line. Although a device has been proposed that takes into consideration the indentation of the material, it is not possible to maintain the straightness sufficiently with this method alone.

Also, although it does not have a movable outer cylinder,
As shown in Japanese Patent No. 54-37409, a configuration has also been proposed in which the pushing direction of the head of the propulsion drilling machine body 1 can be known at the operating position on the ground and this can be appropriately corrected. .

However, this device uses multiple actuators to tilt the head horizontally and vertically, and it is difficult to arrange multiple actuators within a predetermined small diameter casing due to the design. occurs. In addition, regarding the position display for each push-in movement of the head, which is the basis for correction,
Since this method is based on optical means, the operator must proceed with the straight-line drilling work while constantly monitoring a target fixed to the rear end of a steering device that supports the head of the tip of the conduit that is successively press-fitted.

In this case, it is difficult to monitor the target through a long or curved pipe, and it is not possible to monitor the target sufficiently with the target on the back of the steering device.

[Means for solving the problem] The first invention consists of fixing one swing actuator to the inner cylinder in the main body of the propulsion drilling machine,
As the actuator rotates, predetermined convex portions, flat portions, and
Predetermined recesses, protrusions, and flat parts provided on the back surface of the head, which is engaged with the tip of the movable outer cylinder so as to be able to adjust the direction, are opposed to the inclined parts and recesses, and the direction can be controlled at a predetermined rotational position of the actuator. When the head is pressed by the metal fitting, the head is configured to take a predetermined drilling direction due to the contact between the two surfaces, and by using a single actuator, the drilling direction can be changed to an arbitrary predetermined direction. This allows the direction to be changed. In a second invention, the main body of the propulsion drilling machine has built-in detectors for the drilling direction of the head and the pitching angle, rolling angle, and horizontal angle of the main body itself, so that the propulsion drilling work can be easily performed by remote control from the ground. It is structured so that it can be implemented.

The embodiments shown in the drawings will be described below.

FIG. 2 is a schematic diagram of an embodiment of the invention.

The overall difference from the one shown in FIG. The head 10 is also constructed so that it can be coupled at a certain angle to the axis of the main body rather than perpendicularly to the axis, as will be described later.

FIG. 3 shows an example of the main body of the propulsion drilling machine used in the present invention with its longitudinal section, and FIGS. 4 and 5 show the head 10 and the direction control fitting 22 supported by the inner cylinder 20. This shows the engagement relationship.

In FIG. 3, 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 at the diametrical position 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 to hardly rotate around 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. In addition, the movable outer cylinder 11 and the rear outer cylinder 13 have protrusions 1
4 and the corresponding groove allow it to move in the axial direction, but are prevented from rotating relative to each other. Further, 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 swing 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 swing actuator 18, and rotates integrally with the shaft when the hydraulic swing actuator 18 is urged by hydraulic pressure. 23 is a spring press-fitted between a recess formed in the center of the back surface of the head 10 and a recess formed in the center of the front surface of the direction control fitting 22, and as will be described later, the spring 23
When no pressure is applied to the head 8 by hydraulic pressure from the hydraulic cylinder 16 or by the pushing device 3, the front surface of the direction control fitting 22 facing the head 10 is separated by a length L from the back surface of the head 10. The front surface of the protruding direction control fitting 22 is held by the operation of the swing actuator 18 so as not to be obstructed even when rotated. Note that even if the spring 23 is not provided, if a spring is built into the hydraulic cylinder 16 in order to move the direction control fitting 22 backward, rotation of the direction control fitting 22 will not be hindered. The shapes of the back surface of the head 10 and the front surface of the direction control fitting 22 are shown in FIGS. 4 and 5, respectively.
As shown in the figure. Based on this and Figure 3, 24 is the head 10
25 is a convex portion provided on the head 10 side, and the inclination of the convex surface is set to be the same as the inclination angle of the inclined portion 29 of the opposing direction control fitting 22. 26 is a flat portion provided on the head 10 side, and 27 is a flat portion provided on the direction control fitting 22 side.
2 is a convex portion provided corresponding to 4, and 28 is a flat portion also provided on the direction control fitting 22 side,
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.

[Operation] Therefore, the operator examines 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 determine the pitching angle, rolling angle, and horizontal angle of the propulsion drilling machine body 1 shown on the display 8, and by operating the rocking actuator 18. head 10
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 or the spring built into the hydraulic cylinder.

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 always displayed on the display 8 by the potentiometer 31, and from this angle, the position of the convex portion 27 of the direction control fitting 22, that is, the set direction of the head 10 can be known. If it is determined that the direction control fitting 22 is traveling straight, the direction control fitting 22 is rotated while watching the rotational position of the direction control fitting 22 from the potentiometer 31 on the display 8, and the convex portion 27 and the inclined portion on the front side of the direction control fitting 22 are rotated. 29 to match the concave portion 24 and convex portion 25 on the back surface of the head 10, and if it is necessary to change the direction, similarly rotate the direction control fitting 22 to bring the convex portion 27 to a predetermined position.

Then, the pushing device 3 pushes the pipe between the pushing device 3 and the propulsion drilling machine main body 1 forward, using the frictional resistance of the partial pipe 2 with the earth and sand and the reaction plate 4 as points of effort.

Next, when the hydraulic cylinder 16 is energized by the operation panel 6, the piston rod of the hydraulic cylinder 16 is pushed forward, which moves the inner cylinder 20 forward.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
is returned to the position spaced apart by the spring 23 or the spring built into the hydraulic cylinder, and becomes ready for the next direction adjustment.

The specific work procedure will be explained in FIG. 6.

is the initial state, and the direction control fitting 22 is adjusted to a predetermined position.

shows the state in which the cylinder 16 is extended.

In this case, the cylinder 16 is deenergized and the distance L is maintained, and then the direction control fitting 22 is set at a predetermined position.

is the state pushed by the pushing device 3.

And that's it...
, , etc. are repeated.

As explained above, according to the apparatus of the present invention, pipes can be laid extremely accurately and quickly.

It goes without saying that the present invention can be applied to the installation of any of steel pipes, concrete pipes, and plastic pipes.

[Effect] According to the first invention, the head attached to the tip of the movable outer cylinder can be reliably oriented in a predetermined direction with respect to the axis of the propulsion drilling machine body with a relatively simple configuration. can.

Further, according to the second aspect of the invention, a detector is built in, and work can be smoothly performed using the main body, the hydraulic power source, the pushing device, and the operation panel.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a pipeline installation method using an underground propulsion drilling device. FIG. 2 is a diagram schematically showing the underground propulsion drilling device for laying pipes according to the present invention. FIG. 3 is a sectional view of an example of the main body of the propulsion drilling machine used in the present invention. Figures 4 and 5 are from Figure 3 A-A.
and a sectional view taken along line BB. FIG. 6 is an operational diagram of the apparatus of the present invention. 1... Propulsion drilling machine main body, 2... Partial pipe line, 3...
... Pushing device, 4... Reaction force plate of pushing device, 5...
...Hydraulic power source, 6...Operation panel, 7...Hydraulic hose, 8
...Display, 9...Cable, 10...Head, 1
DESCRIPTION OF SYMBOLS 1... Movable outer cylinder, 13... Rear outer cylinder, 15... Seal, 16... Hydraulic cylinder, 17, 19... Hydraulic piping, 18... Hydraulic swing actuator, 20
... Inner cylinder, 22 ... Direction control fitting, 23 ... Spring, 24 ... Recess provided on the back of the head 10,
25...Convex portion provided on the back surface of the head 10, 26...
Flat part provided on the back surface of the head 10, 27... Convex part provided on the direction control fitting 22, 28... Direction control fitting 2
The flat part provided in 2, 29... Also the sloped part, 30...
...Similarly, recessed portion, 31, 34... Potentiometer, 32... Tilt angle detector.

Claims (1)

[Scope of Claims] 1. A direction control fitting having a convex portion, a flat portion, an inclined portion, and a concave portion is attached to the rotating shaft of a swing actuator fixed to an inner cylinder, and the inner cylinder is slidably fitted to the movable actuator. A head is engaged with the tip of the outer cylinder so that the direction can be adjusted, and a concave part, a convex part, and a flat part are formed on the back surface of the head in correspondence with the convex part, flat part, slope part, and concave part of the direction control fitting. A hydraulic cylinder is fixed to a rear outer cylinder which is provided to face the surface of the direction control fitting, is slidably fitted into the movable outer cylinder, and is arranged to face the rear end of the inner cylinder, and the hydraulic cylinder a propulsion drilling machine body having a piston rod fixed to the inner cylinder; a pushing device;
An underground propulsion drilling device for laying pipelines, characterized by being equipped with a hydraulic power source and an operation panel. 2. A direction control fitting having a convex part, a flat part, an inclined part, and a concave part is attached to the rotating shaft of the swing actuator fixed to the inner cylinder, and the direction control fitting is attached to the tip of the movable outer cylinder into which the inner cylinder is slidably fitted. Adjustably engages the head, and provides a concave part, a convex part, and a flat part on the back surface of the head in correspondence with the convex part, flat part, slope part 29, and concave part of the direction control fitting, thereby controlling the direction. A hydraulic cylinder is fixed to a rear outer cylinder that is slidably fitted into the front movable outer cylinder and is arranged to face the rear end of the inner cylinder, facing the surface of the metal fitting, and the piston rod of the hydraulic cylinder is fixed to the inner cylinder. A propulsion drilling machine body fixed to a cylinder, having a potentiometer for detecting the rotation angle of the direction control fitting attached to the rotating shaft of the swing actuator, and having at least pitching angle and rolling angle detectors built in the rear outer cylinder. An underground propulsion drilling device for laying pipes, comprising: a pushing device, a hydraulic power source, and an operation panel.