JPH0131675Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe burying device for burying underground pipes such as Huyum pipes while excavating and promoting them.

To give an overview of the pipe burying device, a pit is dug at the starting location for pipe burying, and the main body of the burying device is installed in the pit. The main body of the device is movable in the direction of burying the pipe,
A removably attached screw and a cutter attached to the tip of the screw are rotated. The tip of the cutter and screw is surrounded by a cutter head, which supports the screw and cutter so that they rotate stably, and whose outer diameter is equal to the outer diameter of the buried pipe and whose tip is wedge-shaped and cuts around the hole to adjust the hole shape. . The screw and the screw casing are connectable, and excavation is carried out by moving the main body of the apparatus while rotating the cutter through the screw. When the excavation length advances by the unit length of the buried pipe,
The burying device main body retreats by the length of the pipe unit, adds the buried pipe, adds a screw and screw casing, and repeats the above operations to bury the pipe.

Since the rigidity in the direction perpendicular to the screw axis decreases as the excavation length increases, it is essential that the cutter head has a function for direction correction.

FIG. 1 shows a schematic diagram of a cutter head of a conventional pipe burying device.

The cutter head 1 is equipped with a funnel-shaped guide ring 2 and a base ring 4 that contacts the buried pipe 3, and the guide ring 2 is slidably fitted into the base ring 4 and the screw casing 6 via a seal ring 5. are doing. Direction correction cylinders 7 are disposed between the guide ring 2 and the base ring 4 at positions that are appropriately equally divided around the circumference, and by extending the cylinders 7 at appropriate locations, the guide ring 2 is tilted relative to the axis of the screw 8. It's getting old.

9 in the figure is a cutter.

With the cutter head structure described above, if the excavation resistance is strong, the cylinder 7 cannot be extended or the extended cylinder 7 is pushed back, making it impossible to maintain the tilted state of the cutter head 1. Another disadvantage is that the direction correction force is weak due to the short length of the guide ring 2 in the axial direction.

In this invention, a blade plate is moved in and out between the cutter head and the buried pipe (original pipe if the original pipe is used), so that the cutter head can be tilted by the thickness of the blade plate due to excavation resistance, and a bit is installed at the tip of the cutter head. A pipe embedding method that solves the drawbacks of the conventional method by installing a cutter head and disturbing the ground around the cutter head so that the cutter head can tilt even in hard ground without succumbing to the surrounding earth pressure, and making it possible to swing the cutter head strongly and reliably. Regarding equipment.

Embodiments of the present invention will be described below with reference to the drawings.

2 to 4 are explanatory diagrams of the cutter head section, where 10 is the cutter head, 11 is a buried pipe connected to the cutter head 10 via the main pipe 12,
13 is an added screw casing, 14 is a screw, and 15 is a foldable cutter.

The cutter head 10 is composed of a head unit 16 and a leading pipe 17, and the head unit 16 includes an inner cylinder 18 that can be attached to the screw casing 13 and also serves as the screw casing, and an outer cylinder 18 whose outer diameter is slightly smaller than the inner diameter of the buried pipe 11. The base end of the outer cylinder 19 (the end on the buried pipe 11 side) is arranged concentrically with the cylinder 19.
is fixed to the middle part of the inner tube 18 via a donut plate 20, and the tip of the inner tube 18 and the tip of the outer tube 19 are fixed with a funnel-shaped ring 21. An outer cylinder 22 whose outer diameter is the same as the buried pipe 11, and an outer cylinder 19 of the head unit whose inner diameter is the same as that of the buried pipe 11.
A slightly larger inner cylinder 23 is arranged concentrically, the outer cylinder 22 is fixed to the base end of the inner cylinder 23 via a ring plate 24, and the tips of the outer cylinder 22 and inner cylinder 23 are fixed by a funnel-shaped ring 25. A plurality of bits 26 are fixed to the outer peripheral surface of the distal end of the outer cylinder 22, and a stop ring 27 is fixed to the inner circumferential surface of the distal end of the inner cylinder 23.
The head unit 16 having such a structure and the leading pipe 17 are slidably fitted, and the end of the head unit 16 is brought into contact with the stopper ring 27.

Bearings 28 are fixed at required equal positions on the circumference of the donut plate 20, and the shaft 2 is attached to the bearings 28.
9 is fitted rotatably. In addition, the base end of the shaft 29 is chamfered in parallel with two chamfers, and a blade plate 3 is attached to the two chamfers.
0 so that it can slide in the axial direction of the shaft 29 and rotate integrally with the shaft 29. Then, the donut plate 20 and the wing plate 3
A helical cylinder 3 has a spring 31 interposed between the ends of the shaft 29, a spacer 32 interposed at the base end of the shaft 29, a nut 33 screwed together, and a helical groove 34 carved at the tip.
Fix 5.

The cylinder 3 is located on the axial extension line of the shaft 29.
6 and attach it to the inner cylinder 18. A square column 37 attached to the tip of the cylinder rod is slidably fitted into the spiral tube 35, and the pin 3 engages with the spiral groove 34.
8 is provided protruding from the prism 37. Then, the square column 37 is slidably supported by a bearing 39 through the square hole, and the movement of the square column 37 in the axial direction rotates the spiral tube 35 and the shaft 29, and the blade plate 30 is connected to the main pipe 12 and the tip. It is configured to be able to move in and out between the conduit 17 and the conduit 17.

The distal end of the main pipe 12 has a required diameter to appropriately overlap the proximal end of the outer cylinder 22 of the leading pipe 17 and come into contact with the ring plate 24 of the leading pipe, and a sealing device 40 is provided at the overlapped part. .

The operating state of the cutter head during excavation will be described below with reference to FIGS. 5 to 7.

When traveling straight, all the cylinders 36 are shortened and the blade plates 30 are stored inside the abutment area between the leading pipe 17 and the main pipe 12, and while the cutter 15 is rotated, the buried pipe 11, screw 14, and screw casing are removed. 13, the cutter 15 and leading pipe 1
The earth and sand are scraped off by the screw 7, guided to the tip of the leading pipe 17 and the funnel rings 25, 21 of the head unit 16, enter the inner cylinder 18, and are discharged by the screw 14 (see FIG. 5). The resistance experienced by the leading pipe 17 in this excavated state is transmitted to the buried pipe 11 via the base pipe 12, and the resistance experienced by the head unit 16 is transmitted to the screw casing 13.

Next, we will discuss the case where it is desired to correct the direction, that is, the case where the vehicle deviates from the straight direction.

First, the head unit 16 is pushed in through the screw casing 13. Although the leading pipe 17 is pushed together with the head unit 16 via the stopper ring 27, the main pipe 12 remains, and a gap g is created between the main pipe 12 and the leading pipe 17. If the cylinder 36 on the shifted side is extended in this state, the square column 37 will slide inside the spiral tube 35, and the spiral tube 35, that is, the shaft 29 will rotate, causing the vane plate 30 to protrude into the gap g (Fig. 6). reference).

Next, the head unit 16 is returned to the position before being pushed in and excavation is started. When the base pipe 12 and the leading pipe 17 come into contact with each other due to the buried pipe 11 pushed in as the excavation progresses, the blade plate 30 is interposed in a part of the contact area between the base pipe 12 and the leading pipe 17, and the leading pipe 17 Since tip resistance is applied to the leading pipe 17, the axial center of the leading pipe 17 is inclined by the axial center of the existing buried pipe 11 and the thickness of the blade plate 30 (see FIG. 7).

At this time, the bit 26 at the tip of the leading pipe 17 is the leading pipe 1.
7.It works to disturb the surrounding ground and loosen the earth pressure,
The leading pipe 17 will not be unable to swing due to surrounding earth pressure, and will surely incline by the thickness of the blade plate 30 even on hard ground. In addition, the presence of the bit 26 increases the digging resistance against the leading pipe 17, so the force that causes the leading pipe 17 to swing can be strengthened.
A stable direction correction function can be realized.

Also, due to the inclination of the leading pipe 17, the head unit 1
6 is also tilted, giving bending deformation to the screw casing 13 and the screw 14, but the screw casing 1
3. Since the length of the screw 14 is sufficiently long, it follows the inclination of the head unit 16 without any trouble.

If the excavation proceeds further with the leading pipe 17 tilted, the drilled hole will be guided by the leading pipe 17 and its direction will be corrected as appropriate. When the correction amount reaches the desired value, only the head unit 16 is pushed in and the main pipe 12 is moved in the same way as described above.
A gap g is formed between the cylinder 36 and the leading pipe 17 to shorten the cylinder 36 and accommodate the vane plate 30. Thereafter, the excavation can be carried out in the same manner as the tilt operation.

In the direction correction described above, the leading pipe 17 and the main pipe 12
The blade plate 30 is inserted into and out of a part between the leading pipe 1
Due to the excavation resistance against 7, the leading pipe 17 is
Since it is mechanically oscillated by the thickness of 0, it does not become impossible to correct the direction due to the resistance of excavation. Further, since the length of the leading pipe 17 in the axial direction is long, the direction correction force can be increased. Furthermore, the tip of the cutter head,
In other words, the bit 26 is attached to the outer peripheral surface of the tip of the leading pipe to relieve the earth pressure around the cutter head 10, so it is possible to reliably correct the direction even in hard ground, and the excavation resistance against the leading pipe is increased, resulting in stability. A direction correction function can be realized. Another advantage is that the outer diameter of the head unit and cutter is smaller than the inner diameter of the buried pipe, making it convenient to take them out for maintenance or the like.
Note that when the above-described process is carried out, the head unit 16 and the screw 14 may be pushed in if the excavation resistance is strong, but at this time the blade plate 30 slides along the shaft 29, is not bent.

FIG. 8 is an explanatory diagram of a cutter head in another embodiment of the present invention, in which an inner cylinder 41 that can be attached to the screw casing 13 and also serves as the screw casing on the tip side, and an inner cylinder 41 having the same outer diameter as the buried pipe 11 are shown. An outer cylinder 42 having an outer diameter is arranged concentrically, and the base end of the outer cylinder 42 is fixed to the middle part of the inner cylinder 41 via a donut plate 43, and the tip of the inner cylinder 41 and the tip of the outer cylinder 42 are A plurality of bits 26 are attached to the tip of the outer cylinder 42 of the cutter head 45 constructed as described above, as shown in FIG. In between, the cutter head 45 can be tilted by the thickness of the blade plate 30 by the excavation resistance by moving it in and out as appropriate in the same manner as in the first embodiment. In the figure, 46 is a cylinder attached to the inner cylinder 41 so as to be located on an extension of the shaft 47 that supports the vane plate 30, and 47 is a transmission that converts the linear motion of the rod of the cylinder 46 into rotational motion and transmits it to the shaft 47. The same reference numerals as in FIG. 2 indicate the same parts.

When carried out in this manner, the interior of the cutter head 45 can be made very simple, so it can be manufactured for small-diameter fume pipes, and has a wide range of applications.Also, since a large digging resistance acts on the cutter head 45, the cutter head 45 can be cut easily when changing the direction. The force that causes the cutter head 45 to swing its head becomes very strong, and during excavation, the cutter head 45 strongly presses against the main pipe 12 and becomes stable.
In addition, as in the first embodiment, the earth pressure around the cutter head can be relaxed by the bit 26, so that the direction can be reliably corrected even on hard ground.

It should be noted that the present invention is not limited to the above-mentioned embodiment; for example, the main pipe may be omitted and a blade plate may be moved in and out between the buried pipe and the cutter head, and the number of blade plates and the attachment to the cutter head may be changed. The number of bits may be increased or decreased as necessary, and the driving device for protruding and retracting the vanes may be a cylinder, motor, or link mechanism with a rotating function, without departing from the gist of the present invention. Of course, various changes can be made within the scope.

As described above, according to the present invention, (i) the tip resistance is used to tilt the cutter head, so even if the earth pressure resistance is strong, the cutter head will not be unable to swing due to strong earth pressure resistance, and the direction can be corrected; can be done reliably.

(ii) Since the cutter head is equipped with a bit that can relieve the earth pressure around the cutter head, there is no risk that the cutter head will be unable to swing due to the surrounding earth pressure in the case of hard ground, allowing for powerful and reliable direction correction. Function can be expressed.

This excellent effect can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the cutter head portion of a conventional pipe burying device, FIG. 2 is an explanatory diagram of the cutter head portion of the pipe burying device according to the present invention, and FIG. 3 is an explanatory diagram of the cutter head portion of the pipe burying device of the present invention.
Figure 4 is a view taken along the line B-B in Figure 2 (however, the cutter is omitted), Figures 5 to 7 are explanatory diagrams showing the operating state of the cutter head during excavation, and Figure 8 is a diagram showing the operating state of the cutter head during excavation. FIG. 6 is an explanatory diagram of another embodiment of the present invention. 10, 45... cutter head, 11... buried pipe, 12... main pipe, 13... screw casing, 14... screw, 15... cutter, 1
6... Head unit, 17... Lead pipe, 26...
... Bit, 30... Vane plate, 36, 46... Cylinder.

Claims (1)

[Scope of utility model registration request] In a pipe burying device that excavates by advancing a cutter installed at the tip of a screw conveyor and buries a buried pipe in an excavated hole, the screw conveyor of the screw conveyor that rotatably supports the cutter and is located inside the buried pipe. A plurality of bits are attached to the tip of a cutter head that can be pushed through the casing prior to the buried pipe, and when the cutter head is pushed in ahead of the buried pipe, the cutter head is moved in and out of the gap created between the cutter head and the tip of the buried pipe. A pipe burying device characterized in that blade plates for swinging the cutter head are arranged at required equal positions on the circumference of the cutter head.