JPH01207597A - Under-ground propulsion type drilling device - Google Patents

Abstract

PURPOSE:To improve the execution efficiency by projecting a taper head from the top edge of an outer cylinder when a piston rod retreats to a rear limit and covering the taper head by the advance of an inner cylinder by the extension operation of the piston rod and integrally advancing the inner and outer cylinders. CONSTITUTION:A supporting plate formed integrally with a revolution transmission shaft 4 is connected on one side of the piston rod 8 of a hydraulic cylinder 9, and a supporting part 3' and the revolution transmission shaft 4 are connected so as to be integrally revolved. Further, the other edge sides of the piston rod 8 of the hydraulic 9 is connected with a transmission shaft for the revolution supplied from a hydraulic motor arranged integrally with the hydraulic cylinder 9 so as to be revolved integrally. In the limit retreat state of the piston rod 8, a taper head 3 is projected from the top edge of an outer cylinder 1, and a taper head 9 is covered by the advance of an inner cylinder 2 by the extension operation of the piston rod 8, and the inner and outer cylinders 2 and 1 are advance integrally. Therefore, the precision in the direction control in the under- ground excavation can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industry, field of application] The present invention relates to an underground propulsion drilling device used when laying a pipe body in the soil without excavation.

[Prior art] When burying a pipe in an L, there is a method in which the pipe is buried by excavating to a predetermined depth from the ground, or an appropriate pit is provided without excavating from the ground, or if the pit is not formed due to topography. In places where it is not necessary to install pipes, a construction method is adopted in which the pipes are sequentially buried by excavating or drilling holes in a predetermined direction from the bottom.

The present invention is directed to an underground propulsion drilling device used in a tube propulsion construction method in which pipes are successively pushed in while boring through the soil. First, this tube propulsion method will be explained.

As shown in Figure 4, the starting pit P1 and the arriving pit)
P2 and P2 are dug in -L, and the original pushing device 20 is installed in BI) Pt.

21 is an underground propulsion drilling device, which has a hydraulic section 22 and /111.
A head section 2 connected to a pressure section 22 and operated by hydraulic pressure.
Consisting of 2'. 23 is the previous underground tIE drilling device 2! The tubes are successively press-fitted by the extrusion device 20.

When the main pushing device 20 is in the static IL state, the hydraulic device (not shown) built in the soil thrusting device 2I,
When the head 22' is pushed into the soil in the direction of the arrow and advances by a certain length, the hydraulic pressure of the hydraulic system is released and the main pushing device 20
When the joined pipe body 23 is pushed in the direction of the arrow, the joined pipe body 23 and the hydraulic section 22 of the t-propulsion drilling device move forward together in a state where the hydraulic pressure is released. By repeating this operation, A conduit can be constructed. In addition, in the figure 2
4 is a hydraulic power source, 25 is an operation panel, and 2B is a hydraulic hose and a signal cable.

[Problems to be Solved by the Invention 1) A device shown in FIG. 5 has conventionally been used as an underground propulsion drilling device used in the pipe propulsion method as described in 1j.

In the figure, 31 corresponds to the underground propulsion drilling device 21 in FIG. 4, and 32 and 32' correspond to the hydraulic parts 22. Head part 22
′ corresponds to

33 is a head, 34 is a spherical seat, 35 is a square hole, 36 is a projecting metal fitting, 37 is an outer cylinder, 38 is a piston rod, 39 is a hydraulic cylinder, 40 is a rotation transmission shaft, 41 is an index type/
11+ pressure motor, 42 is a pin, 43 is a concave groove of a constant width formed in the equatorial plane of the spherical seat 34, and 44 is a piston.

The spherical seat 34 that connects the head 33 is rotatably fitted into the tip of the outer cylinder 37, but by fitting the pin 42 into the groove 43 of the spherical seat 34, the direction change of the head 33 is limited to a certain extent. It is composed of This L! 7. A piston rod 38 having a protruding metal fitting 36 at its tip is opposed and in contact with the back surface of the seat surface 4, and the piston rod 38 is
The piston rod 38 is integrated with a piston 44 in the hydraulic cylinder 33 of the lI+ pressure section 32, and furthermore, the piston rod 38 holds a rotation transmission shaft 4° by a hollow hole provided concentrically at the other end, and the rotation transmission shaft 40 is connected to the hydraulic cylinder 39. extends rearward through iT, and this rotation transmission shaft 40 is connected to an index type hydraulic motor 41 fixed to the hydraulic section outer cylinder.

The extraction cylinder 39 has a diameter that fits water-tightly into the outer cylinder 37 of the head section 32'. Although not shown, when /111 pressure is applied to the hydraulic cylinder 33, the piston 44 is moved and the head section Only 32' can be advanced. Rotation transmission shaft 4 coupled to index type hydraulic motor 41
0 can move after +Iij in the hollow hole created by the piston noro throat 38, but the piston mouth and the door 38 can be moved by the keyway connection.
Hend 3
1. The spherical seat 34, which is connected to the spherical seat 34 of 3. <73 can be rotated.

The direction control function of this device is established by the relationship between the expansion and contraction of the piston rod 38 by pressure control of the Ml + compression cylinder 33 and the divided rotation operation of the index type hydraulic motor 41. First, the contraction of the hydraulic cylinder 39 causes the piston to When the rod 38 retreats and the index type hydraulic motor 41 rotates by a predetermined angle, the rotation transmission shaft 40
, the piston port, and the door 38 rotate at the same time.

Therefore, the protruding metal fitting 36 at the tip of the piston rod 38 rotates by a predetermined angle.

From this state, when hydraulic pressure is applied to the hydraulic cylinder 39 to cause it to extend, the piston rod 38 moves forward and the protrusion at the tip of the piston rod 38 moves forward! 136 is pressed against the opposing surface of the spherical seat 34 (as shown), the spherical seat 34 is tilted, and the head 33 held by the spherical seat 34 is also tilted, so that the head 33 is propelled into the soil in the direction of the tilt. It is possible to control the direction of movement of the punching device.

In this way, the index type nII pressure motor 41 can be controlled only in the dividing angle direction. It should be noted that the outer cylinder 37 is configured not to rotate due to the key groove connection with the hydraulic section 32.

In addition, the control of the straight movement state of the underground drilling device 3I is +
111. If the protrusion of the protruding metal fitting 36 is rotated so that it matches the square hole 35 provided corresponding to a part of the spherical seat 34, the protrusion will enter the square hole 35, so the spherical seat 34 will eliminate its inclination, and the spherical seat 34 will not tilt. The front face of 33 is perpendicular to the axis of the device.

This allows the underground fiE drilling device 3I to advance in a straight line.

However, the underground TFTFT device having such a configuration has the following problems.

In other words, since the spherical seat is used as a part of the direction control mechanism, the connection between the spherical seat and the outer cylinder II (spherical surface holding area)
It is not possible to take a large value, so is it possible to take a large value? The maximum angle for each angle was about 10 degrees.

For this reason, since the inclination angle of the head held on the spherical seat is also small, there is a problem in that the direction control of the underground I11 drilling device cannot be fully exerted when the tube is propelled on soft ground.

On the other hand, Japanese Utility Model Application Publication No. 62-7487 (Jitsugan Sho [10-9
G743 specification 11r and drawings), a piston loft that can move forward and backward while rotating by a hydraulic device has an inclined surface attached to the tip. Fixed an issue where the leading hole made by the leading head would collapse and the pipe body would not be able to advance 11F along the leading hole when it hit hard rock and became unable to rotate, or when the leading end head was retreated on soft ground. In order to solve this problem, a leading device has been proposed in which a head cover is provided at the tip of the leading tube to allow the guide tube to move in and out.

When moving this leading device in a straight line in the soil, the hydraulic device built into the leading device rotates the leading end head in 1 and moves it forward by a partial stroke tft, and then the leading device moves it into the soil together with the pipe body. When propelling the head or retracting the tip head into the head cover and moving straight through the leading pipe, the device itself does not have the function of propelling the head, so it is propelled along with the pipe body in the soil by the main pushing device. When controlling the direction of the inclined surface of the head, the pad protrudes into the ground and the hydraulic device changes the head to a predetermined angle, which requires torque, and at this time, the device itself propels the head. Since it has no function, it is pushed along with the pipe in the soil by the main pushing device.

[Structure of the Invention] The present invention provides an underground drilling device capable of overcoming the problems of the conventional device as shown in FIG. A taper head is housed in an inner tube inside the outer cylinder, and the taper head is held in a position protruding from the tips of the outer cylinder and the inner cylinder when a piston rod of a hydraulic device connected to the taper head by a negative shaft is in a retracted position. By moving the piston rod on the protruding top of this taper head, the tip of the inner cylinder reaches the tip of the taper head, and in the soil, the inner cylinder is used to make a hole on the outside of the throat of the taper, and the inclined surface of the taper head is formed. To facilitate the rotation of the taper head by a predetermined angle to change direction and to move the tapered head straight through the soil, the tip of the tapered head and the tip of the inner cylinder are almost aligned in the inner cylinder, and the tip of the outer cylinder is slightly behind this. This is an underground drilling device configured so that the inner cylinder and outer cylinder can be propelled into the soil by moving the piston loft due to gravity while maintaining their relative positions.

Fig. 1 shows an embodiment of the present invention in a tapered and protruding state (direction change control state), and Fig. 2 shows a state in which the inner cylinder covers the protruding taper head of the embodiment in Fig. 1. (straight ahead control state), and FIG. 3 shows a cross section taken along the line AA in FIG. 2.

In Fig. 1, 1 is the outer cylinder, and 1' is -ms of the outer cylinder 1.
Teal outer cylinder IL (ml) h, + IF' part Te, I
” It will be described later (1): ', '+1 It is a through hole through which iT passes (see Figure 3). 2 is an inner cylinder rotatably inserted into the outer cylinder 1 by 11x, and 2' is an inner cylinder. This is a split pipe part formed at one end of the tube 2 (see Figure 3).
). 3 is the taper head, 3' is the support t of the throat to the taper
, 'r part, 4 is a rotation transmission shaft fitted into a hollow hole 5 formed from the end of the support part 3' to the taper, and is slidable in the axial direction by a key and a keyway, and this rotation transmission The tapered head 3 is configured to rotate integrally with the rotation of the shaft 4. The end of the rotation transmission shaft 4 is integrally provided with a support plate 6, and the support plate 6 connects the end of the split pipe portion 2' of the inner cylinder 2 through the through hole l# of the outer cylinder 1 with a pin 6'. The rotation transmission shaft 4 and the piston rod 8 side are connected via the support plate 6 to the pin 7.
Connect on the same axis. 9 is a hydraulic cylinder for the piston rod 8.

A rotation transmission shaft 13 is fitted into a hollow hole 12 formed from the other end of the piston loft 8, and is slidable in the axial direction by means of a key and a keyway. The Taber head 3 rotates integrally.

In addition, IO is a piston, 11 is /111 pressure bottom, 14
indicates hydraulic piping.

+5 indicates an index type hydraulic motor, and the rotation shaft of this index type hydraulic motor I5 is connected to the rotation transmission shaft 13,
is fixed to the frame 16, so the taper head 3 located on the negative axis rotates together with the rotation of the index type hydraulic motor 15. Note that +7 indicates f)/<-. As shown in the figure, at the most retracted position of the piston rod 8, the entire width of the tapered head 1 is exposed from the tips of the inner and outer tubes.

Here, the direction change control operation will be explained. The direction change control of the taper head 3 is performed by rotating the index type hydraulic motor 15 by a predetermined angle, but in the illustrated state, the taper head is rotated in the soil, so an excessive torque is required.

Therefore, in this device, as shown in FIG. 2, hydraulic pressure is applied to the /lb pressure cylinder 9 to advance the piston groove 12 by tIt. As the piston rod I2 moves forward, the inner cylinder 2 moves forward and is pushed out to a position where the tip of the inner cylinder 2 just covers the tip of the tapered head 3. This stroke corresponds to the partition wall 1 of the outer cylinder 1.
' is the length between the back surface of the rotation transmission shaft 4 and the support t, lI temporary 6.

With the inner cylinder 2 retracted from the tip of the tapered head 3, the index type hydraulic motor is rotated to control the angle of the tapered head 3.

Because the inner cylinder 2 protrudes into the soil, a gap is created in the soil around the tapered head 3 by the thickness of the inner cylinder, so the torque required to rotate the tapered head 3 can be small. In this case, the tapered head 3 protrudes from the tip of the outer tube 11 and the cylinder 2, but in this state the device does not have a self-blade propulsion function and is pushed into the soil together with the tube body by the original pushing device.

For straight-line control operation, as shown in Figure 2, hydraulic pressure 7
Due to the extension movement of the piston rod 8 of the cylinder 9, the inner cylinder 2
The tip of the tapered head 3 is in the same position as IJ,
Here, the support plate 6 of the rotation transmission shaft 4, which is integrated with the piston rod 8, allows the outer cylinder work to be separated. -! FIi, 1' is pressed,
Outer cylinder 1. Inner cylinder 2. To taper, do 3 is taper head 3
The tip of is covered with the inner cylinder 2, and the outer cylinder 1 is slightly behind,
While maintaining the king's relative position, it is press-fitted into the soil by the stroke of the histone rod 8, thereby making straight-line control possible.

[Effects of the Invention] As explained above, when controlling the direction of underground 11F drilling equipment, the head uses a spherical seat to take the inclination of the head itself in the conventional technology, so it was not possible to increase the inclination angle. However, in the present invention, a tapered head is used, and depending on the quality of the ground, the tapered head can be replaced with a tapered head with a different slope angle, thereby improving the accuracy of direction control when going 11F underground.

In the device of the present invention, the inner cylinder and the outer cylinder can be moved forward and backward linearly, and in the case of direction control, the inner cylinder can move forward and backward in a straight line. The inner cylinder protrudes from the inside and touches the outer periphery of the tapered head, and the protrusion of this inner cylinder creates a gap around the tapered head, making it easy to change the direction of the taper head, and in the case of linear control, also moves the outer cylinder forward together. Therefore, a large hole is drilled in the upper middle of the 111j direction, and construction using the tube propulsion method can be carried out easily.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the invention in a cane bear with a tapered head protrusion. FIG. 2 shows a state in which the inner cylinder is undulated to the protruding taper of the embodiment shown in FIG. FIG. 3 shows a cross section taken along line AA in FIG. FIG. 4 is an explanatory diagram of the pipe body 1 (1-base l-method) to which the device of the present invention is applied. FIG. 5 shows a conventional underground propulsion drilling device. 1... Outer cylinder, 1 '...Partition part, 1#...Through hole, 2
...Inner r1.2'...Injury pipe +i (, 3...Tapered head, 3'...Support part of tapered head, 4.
... Rotation transmission shaft, 5 ... Hollow hole, 6 ... Support plate for rotation transmission shaft, 8 ... Piston rod, 9 ... Hydraulic cylinder, +5 ... Inch 1x type hydraulic motor.

Claims (1)

[Claims] (1) Connect a support plate integrated with the rotation transmission shaft to one end of the piston rod of the hydraulic cylinder, insert the split pipe part of the inner cylinder into the through hole of the partition wall at the bottom of the outer cylinder, and insert the split pipe part of the inner cylinder into the inner cylinder. A tapered head including a support part is inserted, and the support part and the rotation transmission shaft are connected so that they can move in the axial direction but rotate together, and the end of the split pipe part is connected to the rotation transmission shaft. Connected to a support plate, the other end of the piston rod of the hydraulic cylinder is connected to a rotating shaft for transmitting rotation from a hydraulic motor integrated with the hydraulic cylinder so that it can move in the axial direction but can rotate together. When the piston rod is in the most retracted state, the taper head protrudes from the tip of the outer cylinder, and as the piston rod extends, the inner cylinder moves forward to cover the tapered head, and further, as the piston rod extends, the taper head protrudes from the tip of the outer cylinder. . An underground propulsion drilling device, wherein the inner tube moves forward together with the outer tube while covering the tapered head.