JPS60195295A - Rotary propelling apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

((1) Prior Art and Problems Conventionally, the method of laying pipes across the ground in places with a lot of traffic and buried objects, under tracks, etc. is by propulsion machines with rotating spindles and thrust cylinders. There is a rotary propulsion method in which thrust is applied to the excavation tube while rotating it, thereby propelling the excavation tube into the ground.

There is no problem with this propulsion method if the soil quality of the ground where the advance pipe is installed is relatively uniform and the earth pressure and frictional resistance acting on the outer circumferential surface of the advance pipe are almost uniform.
If the soil quality of the ground on which the excavation tube is propelled has a mixture of hard and soft areas, and the soil pressure and frictional resistance acting on the outer circumferential surface of the excavation tube differ in the circumferential direction of the advancement tube, the excavation tube The direction of propulsion may deviate from the intended direction of propulsion, and there is a risk that the excavation pipe may come into contact with the 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 driving means is required to operate the correction mechanism, the correction mechanism and its auxiliary equipment are complicated, and the correction mechanism must be constantly installed in the cutting tube. This had the drawback of making it difficult to drive the excavation pipe and remove the earth, making it impractical.

(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 advancement tube using the cutting tube. This rotary type is suitable for practical use because it can easily and automatically correct the propulsion direction of the cutting tube by moving it forward and backward while swinging and rotating in the forward and reverse directions within the desired angle range to expand the cutting hole. To provide propulsion equipment.

Structure of the Invention In order to achieve the above object, the rotary propulsion device of the present invention has the following features:
an excavation pipe that is propelled into the ground; a rotary propulsion machine that rotates and propels the evacuation pipe and is capable of reverse and backward movement; The forwarding tube is provided with a hole-expanding blade that protrudes so as to be cut when the forwarding tube is rotated in the opposite direction to its propulsion operation, and the forwarding tube is moved forward and backward while being rotated forward and backward in a desired angle range by the rotary propulsion device. The inner diameter of the penetration hole is expanded by cutting with the hole expanding blade.

(E) Examples of the invention Embodiments of the present 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. 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 XI and X2.

The rotary propulsion device 5 is equipped with a spindle head 6 mounted on a base 4 so as to be movable in the directions of arrows xi and x2, and this spindle head 6 is rotated in forward and reverse directions by a hydraulic motor 7. , thrust cylinder 8
The spindle head 6 thus constructed is fitted with a cutting pipe 9 installed across the road, etc. 1, and this cutting pipe 9 is inserted into the spindle head 6.
It is configured to be chucked by a chuck 10 provided at.

As shown in FIGS. 2 to 7, the distal end of the cutting tube 9 has a double-tube structure that partially overlaps. A plurality of cutting blades 12 are provided at the portion where the outer tube 11 fits into the inner tube portion 9a of the cutting tube 9, as shown in FIGS. 3 and 6.
For example, four square holes 13 are bored in the circumferential direction with a phase difference of 90°, and the inner tube portion 9a is formed with a protrusion 14 that engages with each of the square holes 13 separately. The square hole 13 and the protrusion 14 prevent the outer tube 11 from being pulled out, and also regulate the relative rotation angle between the outer tube 11 and the inner tube portion 9a to a constant value. Further, in the outer tube 11 and the inner tube portion 9a, as shown in FIGS. 2, 3, and 5, a plurality of holes, for example, three holes of the same shape, are arranged on a part of the circumference. 15 and 16 are formed at an angle of α to each other, and these matching holes 1
5. Hole expansion blades F are arranged opposite to the hole expansion blades 17, and the base of the hole expansion blades 17 is rotated in the circumferential direction of the drilling tube 9 by a shaft 19 on a bracket 18 fixed to the inner wall of the inner tube portion 9a. The cutting edge 17a side thereof is inserted into the hole 15.16, and a cutting soil discharge port 20 is formed in the outer tube 11 and the inner tube portion 9a opposite to the cutting edge 17a. Therefore, when the propulsion tube 9 is rotated in the direction of arrow A in FIG. Furthermore, when the advancing tube 9 is rotated in the direction of arrow B in FIG. The cutting edge 17a is the outer tube 11
It protrudes outward from the outer circumferential surface of the cutting tube 90 to cut the inner wall of the penetration hole. 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.

The advance tube 9 is inserted into the spindle head 6 and the chuck 10
When the spindle head 6 is rotated by the hydraulic motor 7 and a thrust is applied in the direction of the arrow X1 in FIG. The tube 9 is rotated clockwise and advanced in the direction of arrow X1. As the cutting tube 9 rotates clockwise, the cutting blade 12 provided at the opening tip edge of the outer tube 11 cuts the ground under the road etc. 1 into a cylindrical shape according to the diameter of the outer tube, and at the same time 9 is advanced, the entire excavation pipe 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 advance pipe 9 is propelled is discharged outside the advance pipe 9 by a water jet (not shown).

On the other hand, when the advancing tube 9 is propelled into the ground under a road or the like, the cutting edge of the hole expanding blade 17 rotates clockwise because the advancing tube 9 rotates clockwise (because of the shape of the cutting blade 12). 17a is aligned with the outer circumferential surface of the outer tube 11 as shown in FIG. (See a)) will not be cut.

That is, at the time when the cutting pipe 9 begins to rotate in the ground in the direction indicated by the arrow in FIG. 5 (forward rotation direction), the inner pipe portion 9 of the cutting pipe 9
Since the outer pipe 11 fitted into the section a is held in a stopped state by earthworks and frictional resistance, first, only the cutting pipe 9 rotates, and then the protrusion 14 of the inner pipe part 9a rotates as shown in Fig. 6. As shown, 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 17b of each hole-expanding blade 17 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, resulting in the state shown in FIG.

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

Assume that the propulsion direction of the excavation pipe 9, which is being propelled into the ground by the rotary propulsion device 5, deviates upward by θ° with respect to the correct propulsion direction line L, as shown in FIG. 9 (al).If this is detected, For example, position the hole expanding blade 17 at the tip of the advancing tube in the direction in which you want to correct the direction, that is, facing the lower side of the cutting tube 9 as shown in FIG. Then, the spindle head 6 is reversely rotated, and the cutting tube 9 is rotated to the left as shown by arrow B in FIG. However, as shown in FIG. 8, the outer tube 11 rotates in the direction of arrow B until it engages with the edge 13b of the square hole 13 as shown in FIG.
Since a relative displacement occurs in the direction of arrow B between the inner tube portion 9a and the inner tube portion 9a, the cutting edge 1 of the hole expanding blade 17 supported by the inner tube portion 9a
7a is the edge 15b of the hole 15 of the outer tube 11 as shown in FIG.
The cutting edge 17a rotates in the direction of the arrow, and the cutting edge 17a touches the outer tube 11.
It will protrude outward from the outer peripheral surface of. 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, the angle θ1 ゛ (see Fig. 9 (see C1) required for correcting the direction of propulsion of the advancing tube 9) is applied to the counterclockwise rotation, the hydraulic motor 7 is started to rotate forward, and the advancing tube 9 is rotated clockwise by θ. 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 θ1°, and the thrust cylinder 8 is moved backward to move the cutting tube 9 backward. As a result, a hole expansion groove 23 (cut by the swinging of the hole expansion blade 17) is formed in the penetration hole 22 as shown in FIG. 9(C). The formation position of the hole expansion groove 23 is the forward tube 9
When it reaches near the starting point of deviation in the propulsion direction, the cutting pipe 9
thrust cylinder 8 while rotating left and right in the angle range of 01.
It is advanced to the propulsion end position shown in FIG. 9(a). At this time, since the cutting advancement tube 9 is hardly restricted by the penetration hole 22 that has already been formed, the advancement tube 9 is rotated by θ°.
It cannot be bent in the wrong direction. Therefore, due to the rigidity of the cutting tube 9, the hole expanding blade 17 cuts the groove 23 to make it deeper, and by inserting the advancing tube 9 into this groove, the direction of propulsion of the cutting tube 9 is changed to the correct propulsion direction. It is made to match line L. FIG. 9 (dl shows this state, indicating that the direction of the forward tube 9 has been corrected.

Note that if the direction of the forward tube 9 cannot be corrected by one reciprocating movement of the forward tube 9 described above, the above-described operation may be repeated twice, three times, etc.

As described above, in this embodiment, the hole-expanding blade 17 protrudes from the outer periphery of the outer tube 11 only when it rotates to the left, which is the opposite of the propulsion operation.
Since the inner wall of the penetration hole 22 in the direction to be corrected is cut to a desired length within a desired angle range, it is easy to correct the direction of the cutting tube. Since it is only necessary to move the correction mechanism, there is no need for driving and operating means for the correction mechanism as in the past, and the mechanism is simple, and there is no problem with the advancement work of the advance pipe 9 and the soil removal work, making it highly practical. It can be a high rotary propulsion device.

Note that when the cutting tube 9 is rotated in the opposite direction to the propulsion operation,
The mechanism of the hole expanding blade 17 which is protruded so as to be able to cut the hole is not limited to that of the above embodiment.

(F) As described in detail, according to the rotary propulsion device of the present invention, the peripheral wall of the distal end of the cutting advance tube has a hole that protrudes so as to be cuttable when the advance tube is rotated in the opposite direction to the propulsion operation. A cutting blade is provided, and the cutting tube is moved back and forth while rotating forward and backward within a desired angle range, and the inner wall of the cutting tube penetration hole is partially cut and expanded by the hole expanding blade, so that the cutting tube can be moved forward and backward. The direction of propulsion of the pipe can be easily and automatically corrected without using a dedicated drive means, etc., and since the direction correction does not require a dedicated drive means, etc. as in the past, the device is simple. It can be 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 forward pipe of the present invention when viewed from the tip, Fig. 3 is a side view of FIG. 2, FIG. 4 is a sectional view taken along line IV--IV of FIG. 2, FIG. 5 is a sectional view taken along line V-V of FIG. 3, and FIG. 6 is a sectional view of FIG. FIG. 7 and FIG. 8 are cross-sectional views when the hole-expanding blade is protruding, corresponding to FIGS. 5 and 6, respectively, and FIGS. It is an explanatory diagram for explaining the direction correction (correction operation) of the cutting tube in 5...Rotary propulsion PS, 6... Spindle head,
7... Hydraulic motor, 8... Propulsion cylinder, 9...
Cutting tube, 9a...Inner tube part, 1o...Chuck, 11
... Outer tube, 12 ... Cutting blade, 13 ... Square hole,
14... Projection, 15, 16... Hole, 17... Hole expanding blade, 18... Bracket, 19... Shaft, 22...
Penetration hole, 23...groove.

Claims (1)

[Claims] an advancement tube that is propelled into the ground; a rotary propulsion device that is capable of advancing the advancement tube while rotating it and performing reverse and backward movement; It is equipped with 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 advancing tube is moved forward and backward while being rotated forward and backward within a desired angle range by the rotary propulsion device. A rotary propulsion device characterized in that the inner diameter of the pipe penetration hole is expanded by cutting with the hole expanding blade.