JPS6223913Y2 - - 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 body moves back by the unit length of the pipe, 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 direction correction function.

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 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 positions, the guide ring 2 is tilted with respect 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. Furthermore, since the reaction force for tilting the guide ring 2 is generated in the buried pipe 3, the cutter head 1 cannot be made smaller than the inner diameter of the buried pipe 3. For this reason, the cutter head cannot be taken out of the hole, and even if the cutter 9 or the tilting mechanism is damaged, the cutter 9 cannot be replaced or the tilting mechanism cannot be repaired.

The present invention was developed to eliminate these drawbacks, and includes a cutter that can be folded to a diameter smaller than the inner diameter of the buried pipe, a head unit that can be supplemented with a screw casing and has a smaller diameter than the inner diameter of the buried pipe, and a cutter that is continuous with the buried pipe. and a head casing slidably fitted to the head unit so as to engage with the head unit when the head unit moves forward, and the head casing is divided into a main pipe and a leading pipe, and the divided portion is slidable. When the leading pipe slides against the main pipe, it overlaps with the splitting point.
The cutter head is constructed such that a gap is created between the cutter heads, and blade plates are arranged at positions facing the dividing points of the head casing and equally divided in the circumference, and each blade plate is configured to be able to move in and out between the gaps. The present invention relates to a pipe embedding device characterized by comprising:

Embodiments of the present invention will be described below based on the drawings.

2 and 3 are explanatory diagrams of the cutter head, where 10 is a buried pipe, 11 is an added screw casing, 12 is a screw, and 13 is a buried pipe 10.
This shows a cutter that can be folded to a diameter smaller than the inner diameter of the cutter.

The cutter head consists of a head unit 14 and a head casing 15. First, the structure of the head unit 14 will be described.

An inner cylinder 16 that can be attached to the screw casing 11 and also serves as the screw casing, and a buried pipe 1
An outer cylinder 17 whose outer diameter is slightly smaller than the inner diameter of 0 is arranged concentrically, and the base end of the outer cylinder 17 (the end on the buried pipe 10 side) is fixed to the middle part of the inner cylinder 16 via a donut plate 18. Also, the tip of the inner tube 16 and the tip of the outer tube 17 are fixed together by a funnel-shaped ring 19.

Bearings 20 are fixed at required equal positions on the circumference of the donut plate 18, and the shaft 2 is attached to the bearings 20.
1 is fitted rotatably. Further, the base end of the shaft 21 is chamfered in two parallel directions, and the vane plate 22 is fitted to the two chamfered parts so that it can slide in the direction of the axis of the shaft 21 and rotate integrally with the shaft 21. do.
Thus, a spring 23 was interposed between the donut plate 18 and the blade plate 22, a spacer 24 was interposed at the base end of the shaft 21, a nut 25 was screwed, and a spiral groove 26 was carved at the tip. The spiral tube 27 is fixed. The thickness of the blade plate 22 is adjusted appropriately so that when the blade plate 22 is rotated, the amount of inclination of a leading pipe 34 (to be described later) is adjusted in accordance with the soil quality.

The cylinder 2 is located on the extension line of the shaft 21.
The square pillar 29 attached to the tip of the cylinder rod is slidably fitted into the spiral cylinder 27, and the pin 3 which engages with the spiral groove 26 is inserted into the spiral cylinder 27.
0 is provided on the square pillar 29. The square pillar 29 is slidably supported by a bearing 31 through a square hole, and the spiral cylinder 27 and the shaft 21 can be rotated by the axial movement of the square pillar 29.

In the figure, numeral 32 is a window which is made removable and is prepared for attachment and maintenance of the cylinder 28 and the like.

Next, the head casing 15 will be described.

The head casing 15 consists of a base pipe 33 that is continuous with the buried pipe 10 and a leading pipe 34 that is formed to be considerably longer than the base pipe 33 and is slidably fitted into the outer cylinder 17. are slidably overlapped as appropriate, and a sealing device 35 is provided at the overlapped portion.The tip of the leading tube 34 is formed into a funnel shape similar to the head unit 14, and a stopper ring 36 is fixed to the inner wall of the tip. 14 from protruding from the leading pipe 34.

The operating state of the cutter head during excavation will be described below with reference to FIGS. 4 to 6.

When moving straight, all the cylinders 28 are shortened and the blade plates 22 are stored inside the head casing 15, and the buried pipe 1 is removed while rotating the cutter 13.
0, screw 12, screw casing 11
When the earth and sand are pushed in, the cutter 13 and the leading pipe 34 scrape off the dirt, which is guided by the funnel-shaped ring 19 at the tip of the leading pipe 34, enters the inner cylinder 16, and is discharged by the screw 12 (see Fig. 4). . The resistance experienced by the leading pipe 34 in this excavated state is transmitted to the buried pipe 10 via the base pipe 33, and the resistance experienced by the head unit 14 is transmitted to the screw casing 11.

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 14 is pushed in through the screw casing 11. Although the leading pipe 34 is pushed together with the head unit 14 through the stopper ring 36, the main pipe 33 remains, and a gap g is created between the main pipe 33 and the leading pipe 34. If the cylinder 28 on the shifted side is extended in this state, the square column 29 will slide within the spiral tube 27, and the spiral tube 27, that is, the shaft 21 will rotate, causing the vane plate 22 to protrude into the gap g (Fig. 5). reference).

Next, the head unit 14 is returned to the position before being pushed in and excavation is started. When the base pipe 33 and the leading pipe 34 come into contact with each other due to the buried pipe 10 pushed in as the excavation progresses, the blade plate 22 is interposed in a part of the contact area between the base pipe 33 and the leading pipe 34, so that the leading pipe 34 The axis is inclined by the axis of the existing buried pipe 10 and the thickness of the blade plate 22 (see FIG. 6).

At this time, the buried pipe 10 bears the resistance for tilting the leading pipe 34. Further, as the leading pipe 34 inclines, the head unit 14 also inclines, giving bending deformation to the screw casing 11 and the screw 12.
Since the length is sufficiently long, it follows the inclination of the head unit 14 without any trouble.

If the excavation proceeds further with the leading pipe 34 tilted, the drilled hole will be guided by the leading pipe 34 and its direction will be corrected as appropriate. When the correction amount reaches the desired value, only the head unit 14 is pushed in and the main pipe 33 is moved in the same way as described above.
A gap g is formed between the cylinder 28 and the leading pipe 34, and the cylinder 28 is shortened to accommodate the vane plate 22. Thereafter, excavation can be carried out in the same manner as the tilt operation.

In the direction correction described above, since the leading pipe 34 is mechanically inclined, even when the digging resistance is strong, the direction correction function does not deteriorate due to the digging resistance, and the axis of the leading pipe 34 is Since the length in the central direction is long, the direction correction function is strong.

Further, although there are cases where the head unit 14 and screw 12 are pushed in due to strong excavation resistance, the blade plate 22 slides along the shaft 21 at this time, so the blade plate 22 is not bent.

Incidentally, the number of the vanes may be increased or decreased as necessary, and the drive device for protruding and storing the vanes may also be a cylinder having a rotation function, or a link mechanism may be used.

As described above, according to the present invention, (i) the inclination of the leading pipe is mechanically restrained, so even if the excavation resistance is strong, it will not be defeated by the excavation resistance; (ii) the inclination of the leading pipe is Since the screw shaft etc. are also gently curved, there is no interference between the lead pipe and the cutter. (iii) The head unit is smaller than the inner diameter of the buried pipe, and the cutter can be folded to be smaller than the inner diameter of the buried pipe, so maintenance etc. In this case, it has excellent effects such as being able to take it out to the outside.

[Brief explanation of drawings]

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.
The A arrow view and FIGS. 4 to 6 are explanatory views of the operation when direction correction is performed. 10 is a buried pipe, 11 is a screw casing,
14 is a head unit, 15 is a head casing, 22 is a blade plate, 26 is a spiral tube, 28 is a cylinder, and 36 is a stop ring.

Claims (1)

[Scope of utility model registration request] A cutter that can be folded to a diameter smaller than the inner diameter of the buried pipe, a head unit to which a screw casing can be added and whose diameter is smaller than the inner diameter of the buried pipe, and a cutter that is continuous with the buried pipe and is slidable on the head unit so as to engage with the head unit when the head unit moves forward. and a head casing fitted into the main pipe, and the head casing is divided into a main pipe and a leading pipe, and the divided parts are slidably overlapped, so that when the leading pipe slides with respect to the main pipe, It is constructed so that a gap is created at the dividing point, and further, blade plates are arranged at positions facing the dividing point of the head casing and equally divided as required around the circumference, so that each blade plate can be moved in and out of the gap. A pipe burying device characterized by comprising a cutter head made up of: