JPH0220314Y2 - - 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 promoting excavation.

To explain the outline of the pipe burying device, a pit is dug at the place where the pipe burying starts, and the main body of the burying device is installed in the pit. The main body of the apparatus is movable in the direction of embedding the pipe, and rotates a removably attached auger and a cutter attached to the tip of the auger. The tip of the cutter and auger is surrounded by a cutter head, the outside diameter of which is equal to the outside diameter of the buried pipe, and the tip of the cutter head cuts around the hole to adjust the shape of the hole. The auger and trough pipe can be connected, and excavation is carried out by moving the main body of the apparatus while rotating the cutter through the auger. When the excavation length advances by the unit length of the buried pipe, the burying equipment body moves back by the unit length of the pipe, and as the buried pipe is added, the auger
Add a trough pipe and bury the pipe while repeating the above operation.

However, if the ground to be excavated is a sand layer with a high water level (water-retaining sand layer), water and earth flow violently from the face, making it impossible for the face to stand on its own, and also causing ground subsidence, making it impossible to determine the direction of the cutter head.

Furthermore, a muddy water type can be considered as a pipe burying device in a water-retaining sand layer, but the muddy water type requires a large-scale muddy water treatment facility on the ground and has the disadvantage of requiring a large installation space.

In view of the conventional situation, the present invention rotatably supports a disc-shaped cutter via a bearing at the tip of a cylindrical frame, a partition is provided behind the bearing of the cylindrical frame, and the center of the partition is attached to the cutter. A rotary shaft that extends through the cylindrical frame in the axial direction of the cylindrical frame and is connectable to the auger tip is fixed, an arc-shaped discharge port centered on the axial position of the cylindrical frame is formed in the partition wall, and the rear surface of the partition wall is fixed. an annular seal plate having an outer circumferential end abutting the outer circumferential portion of the discharge port and an annular protrusion abutting the inner circumferential portion of the discharge port, and having an annular space on the inner circumferential side of the annular protrusion; The present invention relates to a pipe embedding device in which an annular piston of an annular fluid pressure cylinder loosely fitted to the rotating shaft is attached to the annular seal plate so that the discharge port can be opened and closed.

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

Figures 1 to 4 show an embodiment of the present invention,
1 is a cutter head, 2 is a cylindrical frame, 3 is a trough pipe, and 4 is an auger. A rotary shaft 5 is fitted to the tip of the auger 4 and fixed with a pin 6 so that they can rotate together, and a spherical shaft 7 is fixed to the other end of the rotary shaft 5, and a cutter 8 is attached to the spherical shaft 7. It is fixed with bolts etc. The cutter 8 has a disc shape, and has two intake windows 9 symmetrical about the center point, and a cutter bit 10 is provided near each intake window 9.
is installed.

A bearing housing such as a tripod housing 11 is fixed to the cylindrical frame 2 with bolts 14 behind the cutter 8, and the spherical shaft 7 of the cutter 8 is fitted into the recess 12 in the center of the tripod housing 11 on the cutter 8 side. The supporting spherical bearing 13 is fixed with a bolt 18, and a double annular projection 16 is provided on the peripheral edge 15 of the recess 12 of the tripod housing 11, and a double annular projection 17 is provided on the back surface of the cutter 8.
They are fitted together to form a labyrinth seal. Further, a ring-shaped seal 19 is provided between the inner periphery of the annular projection 16 and the cutter 7 to prevent earth and sand from flowing into the bearing section.

An annular partition wall 20 is tightly fitted to the side of the tripod housing 11 opposite to the cutter 8, and the partition wall 20
Concentric discharge ports 21 are provided at three locations in portions of the tripod housing 11 that do not overlap with the respective legs.

A cylindrical block 22 is loosely fitted on the side of the rotating shaft 5 opposite to the cutter 8, and the end of the cylindrical block 22 is fixed to the tripod housing 11 so that it cannot rotate. An annular cylinder 2 is attached to the cylindrical block 22.
3, and the annular piston 24 is slidably fitted into the annular cylinder 23, and the annular piston 2
An annular seal plate 25 is fixed to the tip of the annular piston 24, and is moved as the annular piston 24 slides. The annular seal plate 25 has a dish-like cross section, and its outer peripheral end 26 is connected to the partition wall 20.
It is designed to abut and seal the outer periphery of three discharge ports 21 provided in a generally annular shape as a whole.
Furthermore, an annular projection 27 is provided on the partition wall 20 side of the annular seal plate 25 to contact the inner periphery of the three discharge ports 21, and an annular projection 27 is provided on the inner periphery of the annular projection 27 between the annular projection 27 and the partition wall 20. An annular space 28 is provided to facilitate the escape of trapped earth and sand.

An air pipe 29 is arranged between the humid pipe or cylindrical frame 2 and the trough pipe 3 from the burial device main body side, and each air pipe 29 is brought into close contact with the cylindrical frame 2 behind the leg of the tripod housing 11. It is connected to an air introduction member 30 which is fixedly fixed. The air introducing member 30 has a guide hole 31, which is connected to the guide hole 3 provided in the partition wall 20, the tripod housing 11, and the cylindrical block 22.
2, 33, and 34, respectively, and the annular cylinder 23
Air can be supplied to the cylinder chamber 35 of the cylinder.

A thrust bearing 36 is provided between the cylindrical block 22 and the tip of the auger 4, and an annular groove 3 is provided at the piston side end of the annular cylinder 23.
A tripod housing 11 is fixed to the cylindrical frame 2 by fitting an annular protrusion 39 of a flange 38 provided at the end of the auger 4 to 7 and interposing a seal 40, and a cylindrical block 22 disposed non-rotatably. A rotating shaft 5 passing through the cutter 8 is configured to rotate together with the auger 4 and drive the cutter 8 in rotation.

In the figure, 41 is a feed blade provided near the rear intake window 9 of the cutter 8, and 42 is a guide provided at the tip of the auger 4, which rotates together with the cutter 8, rotating shaft 5, and auger 4 to send earth and sand to the screw 43 side. board, 4
4 shows the support ring of the guide plate 42.

When the auger 4 is rotated by the burial device main body (not shown), the rotation shaft 5, the cutter 8 and the guide plate 4
2. The support ring 44 rotates together. Furthermore, when compressed air is supplied through the air pipe 29, the compressed air is sent to the cylinder chamber 35 of the annular piston 23 through the respective guide holes 31, 32, 33, and 34, and the annular piston 24 is protruded and is heated at a predetermined pressure. The annular seal plate 25 is pressed against the partition wall 20 and the discharge port 21 is closed.

The earth, sand and water excavated by the cutter bit 10 are taken in through the intake window 9 and are taken in through the respective discharge ports 2 of the bulkhead 20.
1, but since each discharge port 21 is blocked by the annular seal plate 25, it cannot move to the trough pipe 3 side.

However, the pressure of compressed air can be applied to dirt and sand from the face.
By keeping the pressure lower than the inflow pressure of water, the pressure between the two is balanced, and the annular seal plate 25 that closes the outlet 21 retreats, creating a gap around each outlet 21 and allowing dirt and water to flow through the outlet. 21 , is guided toward the rear auger 4 side by a rotating guide plate 42 , and is transported inside the trough pipe 3 .

Therefore, by adjusting the pressure of compressed air, the gap between the partition wall 20 and the annular seal plate 25 can be freely changed, and the discharge amount of earth, sand, and water can be arbitrarily set between zero and the maximum discharge amount. can do. As a result, ground subsidence due to rapid inflow of water and earth during excavation in the water-retaining sand layer can be prevented, and the excavation direction of the cutter head 1 is also stabilized.

Also, when stopping excavation, such as when connecting a humid pipe,
The pressure of the compressed air is increased to cause the annular piston 24 to protrude and press the annular seal plate 25 against the partition wall 20 to completely close each discharge port 21. At this time, since the contact area between the outer peripheral end 26 of the annular seal plate 25 and the annular protrusion 27 and the partition wall 20 is reduced and an annular space 28 is provided, the trapped dirt can easily escape, resulting in a sealing effect. is high.

Note that the pipe burying device of the present invention is not limited to the above-mentioned embodiments, and the pressure fluid that operates the annular piston may be not only compressed air but also pressure oil,
Of course, various changes can be made without departing from the gist of the present invention, such as that other fluids such as pressurized water may be used, and that the means for supplying the pressurized fluid to the annular cylinder may be in other forms. It is.

As described above, according to the pipe embedding device of the present invention, a partition wall equipped with an outlet is fixed to the rear of a bearing housing such as a tripod housing that supports a cutter, and a seal plate capable of closing the outlet is fixed using fluid pressure. Since it is movably arranged with a cylinder, by adjusting the pressure of the fluid, the discharge amount of soil and water can be freely set according to the water pressure of the water-retaining sand layer. Subsidence can be prevented and the excavation direction of the cutter head can be stabilized. Furthermore, it is possible to prevent the inflow of water and earth and sand when excavation is stopped, making pipe connection work easier, preventing ground subsidence, and improving safety. By forming this structure, the sealing performance of the discharge port can be improved by reliably preventing sand from being trapped so that the soil can escape from between the discharge port and the annular seal plate.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the pipe burying device of the present invention, Fig. 2 is a view taken in the - direction arrow of Fig. 1, Fig. 3 is a view taken in the - direction arrow of Fig. 1, and Fig. 4 is a view taken in the - direction arrow of Fig. 1. - It is a direction arrow view. 1 is a cutter head, 2 is a cylindrical frame, 5 is a rotating shaft, 8 is a cutter, 9 is an intake window, 11 is a tripod housing, 20 is a partition, 21 is an outlet, 23 is an annular cylinder, 24 is an annular piston, 25 is Annular seal plate, 29 is air pipe, 31,3
2, 33, and 34 indicate guide holes.

Claims (1)

[Scope of utility model registration request] A disc-shaped cutter is rotatably supported at the tip of a cylindrical frame via a bearing, a partition is provided behind the bearing of the cylindrical frame, and a cutter is provided with a cutter extending in the axial direction of the cylindrical frame through the center of the partition. , and a rotary shaft connectable to the tip of the auger is fixed, an arc-shaped discharge port centered on the axial position of the cylindrical frame is formed in the partition wall, and an outer periphery that abuts the outer periphery of the discharge port is formed on the rear surface of the partition wall. An annular seal plate having an annular protrusion that abuts the end portion and the inner periphery of the discharge port and an annular space on the inner periphery side of the annular protrusion is disposed, and the annular seal plate is loosely fitted to the rotating shaft. A pipe embedding device characterized in that an annular piston of an annular fluid pressure cylinder is attached so that a discharge port can be opened and closed.