JPH0216837B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a propulsion device employed when laying a pipeline underground, such as under a road or track, and in particular to a propulsion device that rotates the This invention relates to an improvement of a propulsion device that propels and installs a cutting pipe into the ground by applying thrust while moving the ground.

(b) Conventional technology and problems Conventionally, the method of laying pipes across the ground in areas with heavy traffic and buried objects, such as under tracks, has been to use a propulsion machine with a rotating spindle and a thrust cylinder to cut the pipes. There is a rotary propulsion method in which thrust is applied while rotating the cutting pipe, thereby propelling the cutting pipe into the ground.

There is no problem with this type of propulsion method if the soil quality of the ground where the excavation pipe is installed is relatively uniform and the earth pressure and frictional resistance acting on the outer circumferential surface of the excavation pipe are almost uniform. When the soil quality of the ground on which the excavation pipe is propelled has a mixture of hard and soft parts, and the earth pressure and frictional resistance acting on the outer circumferential surface of the excavation pipe become different in the circumferential direction of the excavation pipe, The propulsion direction of the excavation tube may deviate from the intended propulsion direction, and there is a risk that the excavation tube may come into contact with a buried object or damage the buried object.

Therefore, it is conceivable to provide a direction correction mechanism at the tip of the excavation pipe, but this method requires the removal of soil that enters the excavation pipe from the opening at its tip as the excavation pipe is propelled. Since the cutting tube rotates and a drive means is required to operate the correction mechanism, the correction mechanism and its auxiliary equipment are complicated, and the correction mechanism is always installed in the cutting tube. This made it difficult to drive the excavation pipe and to remove soil, which resulted in the drawback of poor practicality.

(c) Purpose of the invention The present invention solves the above-mentioned conventional drawbacks, and its purpose is to remove the inner wall of the penetration hole that has already been formed by the advancement of the recessed pipe. The direction of propulsion of the cutting tube can be easily and automatically corrected by rotating it forward and backward in the desired angle range in the forward and backward directions for cutting and expanding the hole. To provide a type propulsion device.

(d) Structure of the Invention In order to achieve the above object, the rotary propulsion device of the present invention includes an excavation tube that is propelled into the ground, and is capable of rotating and propelling this excavation tube and also capable of reverse and backward movement. a rotary propulsion device; and a hole-expanding blade that is disposed at one side on the circumferential wall of the distal end of the abrasive tube and protrudes to be able to cut the abrasive tube when the abrasive tube is rotated in the opposite direction to its propulsion operation; By moving the cutting tube forward and backward while rotating it forward and backward in a desired angle range by the rotary propulsion device, the inner diameter of the cutting tube penetration hole is cut and expanded by the hole expanding blade.

(e) Embodiments of the invention Examples of the invention will be described below with reference to the drawings.

Figure 1 shows an overall configuration diagram when the rotary propulsion device of the present invention is applied to laying pipes such as crossing under roads, where 1 is a road, track, etc. (hereinafter referred to as road, etc.). A push-in shaft 2 and a reaching shaft 3 are formed on both sides of the road 1. A base 4 is installed on the concrete-finished work floor in the push-in shaft 2, and a rotary propulsion device 5 is mounted on the base 4 so as to be movable back and forth in the directions shown by arrows X1 and X2.

The above rotary propulsion device 5 is indicated by arrows X1 and X2 on the base 4.
Spindle head 6 installed so that it can move forward and backward in the direction
This spindle head 6 is equipped with a hydraulic motor 7
The spindle head 6 is designed to be rotated in forward and reverse directions by a thrust cylinder 8, and can be moved forward and backward by a thrust cylinder 8. 9 is inserted, and this cutting tube 9 is configured to be chucked by a chuck 10 provided on the spindle head 6.

As shown in FIGS. 2 to 7, the distal end of the recessed tube 9 has a double-tube structure in which parts overlap, and the opening tip edge of the outer tube 11 forming this double-tube structure is cut. A blade 12 is provided, and a third blade is provided at the portion where the outer tube 11 fits into the inner tube portion 9a of the cutting tube 9.
As shown in FIG. 6 and FIG. 6, a plurality of square holes 13, for example, four square holes 13, are bored with a phase difference of 90 degrees in the circumferential direction, and each of the square holes 13 is formed in the inner tube portion 9a.
3 are formed with protrusions 14 that engage with each other separately,
The square hole 13 and the protrusion 14 prevent the outer tube 11 from coming off, and also regulate the relative rotation angle between the outer tube 11 and the inner tube portion 9a to a constant value. In addition, the outer tube 11 and the inner tube portion 9
As shown in FIGS. 2, 3, and 5, in a, a plurality of holes 15, 16 of the same shape, for example, three holes each, are spaced apart from each other by an angle of α, and are offset to a part of the circumference. The holes 1 are formed and coincide with each other.
A hole-expanding blade 17 is disposed opposite to the holes 5 and 16, and the base of the hole-expanding blade 17 is attached to a bracket 18 fixed to the inner wall of the inner tube portion 9a by a shaft 19 in the circumferential direction of the drilling tube 9. Rotatably pivoted, its cutting edge 1
The 7a side is inserted into the holes 15 and 16, and a cutting soil discharge port 20 is formed in the outer tube 11 and the inner tube portion 9a facing the cutting edge 17a. Therefore, when the cutting tube 9 is rotated in the direction of arrow A in FIG. When the cutting tube 9 is recessed and rotated in the direction of arrow B in FIG. The cutting edge 17a of the hole blade 17 protrudes outward from the outer peripheral surface of the outer tube 11 to cut the inner wall of the penetration hole of the cutting tube 9. Note that 21 is a hole expanding blade cover.

Next, a description will be given of the pipe installation operation of this embodiment configured as described above.

With the cutting tube 9 inserted into the spindle head 6 and gripped by the chuck 10, the spindle head 6 is rotated by the hydraulic motor 7, and the forward movement of the thrust cylinder 8 moves the shaft in the direction indicated by the arrow in FIG.
When thrust is applied in the X1 direction, the integrated cutting tube 9 of the spindle head 6 is rotated clockwise and
Moved forward in the X1 direction. As the cutting pipe 9 rotates clockwise, the cutting blade 12 provided at the edge of the opening of the outer pipe 11 hollows out the ground under the road 1 in a cylindrical shape according to the diameter of the outer pipe, and at the same time tube 9
As the excavation tube 9 is moved forward, the entire excavation tube 9 is sequentially propelled into the ground from its tip side. In addition, when the excavation pipe 9 is used as a laid pipe as it is, the soil cut out as the excavation pipe 9 is propelled is discharged outside the excavation pipe 9 by a water jet (not shown).

On the other hand, when the drilling pipe 9 is propelled into the ground under the road etc. 1, the drilling pipe 9 is rotating clockwise (it rotates clockwise due to the shape of the cutting blade 12), so the drilling blade 17
As shown in FIG. 5, the cutting edge 17a is aligned with the outer circumferential surface of the outer tube 11 or is recessed inward from the outer circumferential surface, and the cutting edge 17a is placed in a state where the cutting edge 17a is aligned with the outer circumferential surface of the outer tube 11 or is retracted inward from the outer circumferential surface, and the cutting edge 17a is inserted into the penetration hole 22 formed as the cutting tube 9 is propelled. (See Figure 9a) There is no cutting. That is, at the time when the excavation pipe 9 begins to be rotated in the ground in the direction of arrow A (forward rotation direction) in FIG. Since it is held in a stopped state by frictional resistance, first, only the cutting tube 9 rotates, and then the protrusion 14 of the inner tube portion 9a moves toward the outer tube 11 as shown in FIG.
When the outer tube 11 is engaged with one end edge 13a of the square hole 13 formed in the outer tube 11, the outer tube 11 also begins to rotate in the same direction as the cutting tube 9 with a delay. At this time, the shoulder portion 17 of each hole expanding blade 17
b is pushed by the edge 15a of the hole 15 of the outer tube 11, and each hole expanding blade 17 is rotated in the direction of arrow C in FIG. 5 to be in the state shown in FIG.

Next, the direction correction operation of the cutting tube 9 will be described.

As shown in FIG. 9a, it is assumed that the propulsion direction of the excavation tube 9, which is being propelled into the ground by the rotary propulsion device 5, deviates from the correct propulsion direction line L by θ°. If this is detected, the hole expanding blade 17 at the tip of the drilling tube is moved in the direction in which the orientation is desired to be corrected, that is, facing the lower side of the drilling tube 9 as shown in FIG. 9b. In this state, the hydraulic motor 7 is started in reverse to rotate the spindle head 6 in the reverse direction, and the cutting pipe 9 is moved to the ninth position.
Rotate to the left as shown by arrow B in Figure b. Accordingly, on the distal end side of the cutting tube 9, only the inner tube portion 9a has its protrusion 14 aligned with the square hole as shown in FIG.
Rotate in the direction of arrow B until it engages with the edge 13b of No. 3. As a result, there is an arrow B between the outer tube 11 and the inner tube portion 9a, which are stopped due to earth pressure and frictional resistance.
Since a relative deviation occurs in the direction, the cutting edge 17a of the hole expanding blade 17 supported by the inner tube portion 9a is pushed by the edge 15b of the hole 15 of the outer tube 11 and rotates in the direction of arrow D, as shown in FIG. As the cutting edge 17a moves, the cutting edge 17a protrudes outward from the outer peripheral surface of the outer tube 11. When the drilling pipe 9 is further rotated in the direction of arrow B in this state, the protruding hole expanding blade 17 cuts the inner wall of the penetration hole 22 that has already been formed by the thrust of the drilling pipe 9, and the cut soil is removed. is taken out from the soil discharge port 20 into the excavation pipe 9. Then, once the gearing tube 9 has been rotated counterclockwise by an angle θ ₁ ° (see Fig. 9 c) required to correct the propulsion direction, the hydraulic motor 7 is started to rotate forward and the gearing tube 9 is rotated θ ₁ ° to the right. Rotate. At this time, the hole expanding blade 17 is retracted from the outer peripheral surface of the outer tube 11, as shown in FIG.

Thereafter, in the same manner, the cutting tube 9 is oscillated left and right within the range of angle θ ₁ °, and the thrust cylinder 8 is operated backward to move the cutting tube 9 backward. As a result, the penetration hole 22 has a hole expanding blade 17 as shown in FIG. 9c.
The hole enlarged groove 23 cut by the swinging is formed. When the formation position of the expansion groove 23 due to the backward movement of the cutting tube 9 reaches the vicinity of the starting point of the displacement in the direction of propulsion of the cutting tube 9, the cutting tube 9 is rotated left and right within an angle range of θ ₁ °. While moving, the thrust cylinder 8 is used to move the robot forward to the propulsion end position shown in FIG. 9a. At this time, the cutting pipe 9 is inserted into the already formed penetration hole 22.
Since there is almost no restriction due to this, the cutting tube 9 is not bent in a direction deviated by θ°. Therefore, due to the rigidity of the drilled tube 9, the hole expanding blade 17 cuts the groove 23 to make it deeper, and by inserting the drilled tube 9 into this groove, the drilled tube 9 is propelled. The direction is made to match the correct propulsion direction line L. FIG. 9d shows this state, and shows that the direction of the cutting tube 9 has been corrected.

In addition, if the direction of the cutting tube 9 cannot be corrected by one reciprocating movement of the cutting tube 9 described above, repeat the above-mentioned operation twice.
You can repeat it 3 times, etc.

As described above, in this embodiment, only when the outer tube 11 rotates counterclockwise, which is the opposite to the propulsion operation, the hole expanding blade 17 protrudes from the outer periphery of the outer tube 11 to correct the penetration hole 2 in the direction to be corrected.
Since the inner wall of No. 2 is cut to a desired length within a desired angle range, it is easy to correct the direction of the cutting tube.Moreover, the direction correction operation only requires rotating the cutting tube 9 counterclockwise and moving forward or backward. The rotary propulsion type is highly practical as it does not require the drive and operation means of the correction mechanism as in the past, and has a simple mechanism.It also does not cause any problems in the propulsion work of the excavation pipe 9 and soil removal work. It can be a device.

It should be noted that the mechanism of the hole expanding blade 17 which is protruded to be capable of cutting when the cutting advance tube 9 is rotated in the opposite direction to the propulsion operation is not limited to that of the above embodiment.

(F) Effects of the Invention As explained above, according to the rotary propulsion device of the present invention, the circumferential wall of the distal end of the cutting tube is provided with an enlarged portion that protrudes so as to be cut when the cutting tube is rotated in the opposite direction to the propulsion operation. A hole cutting blade is provided, and the cutting tube is moved forward and backward while being rotated forward and backward within a desired angle range, so that the inner wall of the cutting tube penetration hole is partially cut and expanded by the hole expanding blade. The direction of propulsion of the cutting tube can be easily and automatically corrected without using a dedicated drive means, etc. Moreover, since the direction correction does not require a dedicated drive means etc. like in the past, the device is simple. Therefore, it can be made highly practical.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram when the rotary propulsion device of the present invention is applied to laying pipes under roads, etc. Fig. 2 is an end view of the cutting pipe of the present invention when viewed from the tip, Fig. 3 The figure is a side view of Fig. 2, Fig. 4 is a sectional view along the - line of Fig. 2, and Fig. 5 is a - of Fig. 3.
A cross-sectional view along the line, FIG. 6, is also the − of FIG. 3.
7 and 8 are sectional views taken along the line, respectively, when the hole-expanding blade is protruding, corresponding to FIGS. 5 and 6, respectively;
FIGS. 9a to 9d are explanatory diagrams for explaining the direction correction operation of the cutting tube in the present invention. 5...Rotary propulsion machine, 6...Spindle head,
7...Hydraulic motor, 8...Propulsion cylinder, 9...
Drilling pipe, 9a...Inner pipe part, 10...Chick, 1
1... Outer tube, 12... Cutting blade, 13... Square hole, 14... Projection, 15, 16... Hole, 17...
Expanding blade, 18...Bracket, 19...Shaft, 22
...Penetration hole, 23...groove.

Claims (1)

[Claims] 1. An excavation pipe that is propelled into the ground, a rotary propulsion machine that rotates and propels this excavation pipe and is capable of reverse and backward movement, and is provided offset to the peripheral wall of the distal end of the excavation pipe, and a hole-expanding blade that protrudes to enable cutting when the cutting tube is rotated in the opposite direction to its propulsion operation, and the cutting tube is moved forward and backward while being rotated in forward and reverse directions within a desired angle range by the rotary propulsion device. A rotary propulsion device characterized in that the inner diameter of the drilling tube penetration hole is expanded by cutting with the hole expanding blade.