JPH0333832Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a shield type tunnel excavator.

(Prior Art) Figure 2 shows a conventional mud-adding shield type tunnel excavator configured to feed mud material to the face side of the cutter to stabilize the face, and 1 is the shield body. , 2 is a shield jack, 3 is a cutter bearing,
4 is a cutter drive source equipped with a small gear that meshes with a gear portion provided on the outer periphery of a coaxial bearing; 5 is a bulkhead/bearing housing; 6 is a cutter face; 7 is a cutter drum having an intermediate beam; 8 and 9 are earth and sand seals; 10 is a cutter drum having an intermediate beam. A screw conveyor is installed in the center of the back head and bearing housing 5, and is buried in the cutter ace 6 by a rotary joint 11 arranged on the back side of the cutter ace 6, and has a muddying material discharge port on its face side. The rear end of the muddying material pipe 13 that opens to 12 is connected to the rotary joint support arm 14 that is disposed between the rotary joint 11 and the bulkhead/bearing housing 5, and the rear end is connected to the muddying material supply pipe 13. The front end of the slurry material pipe 16 connected to the valve 15 is connected.

(Problems to be Solved by the Invention) In the conventional shield type tunnel excavator, gravel gets caught in the rotary joint support arm and the intermediate beam, and the cutter becomes unable to rotate, or the support arm is damaged. There is a risk that
In addition, the rotary joint support arm attached to cover the inlet of the screw conveyor impairs the flow of earth and sand within the chamber, and the effect of taking in earth and sand by the screw conveyor deteriorates.

(Means for Solving the Problems) The present invention was proposed in order to solve these problems. A front mud adding material pipe and a rear mud adding material pipe that communicate with an annular space that is continuous with the cutter drum, and a scraper that is attached to the cutter drum and faces into the annular space,
The front muddy material pipe is buried in the cutter drum, the front end thereof is connected to the muddy material discharge port of the cutter ace, and the rear muddy material pipe is connected to a muddy material supply section in the shield machine. It is characterized by:

(Function) Since the present invention is constructed as described above,
The mudding material supplied from the rear muddying material pipe connected to the mudding material supply section of the shielding machine continues in the circumferential direction defined by the sand seal between the cutter drum and the shielding machine body. The slurry material is supplied into the annular space, and is discharged from the same space through the slurry material piping buried in the cutter drum to the face side from the muddy material outlet of the Katsutaface, and the face side is stabilized by the muddy material. This allows for smooth excavation by the shield excavator.

Therefore, while the excavator is operated for a long period of time, the muddy material may solidify on the inner peripheral surface of the annular space, and when the excavator is stopped, the muddy material may settle. However, since the cutter drum is equipped with a scraper facing into the annular space, the scraper removes the solidified mud as the cutter drum rotates. This prevents the muddy material from solidifying and blocking the annular space.

(Effect of the invention) As described above, in the present invention, the front muddying material pipe on the face side is buried in the cutter drum, and the circumference defined by the earth and sand seal between the cutter drum and the shield machine body is It is connected to an annular space that continues in the direction, and the rear muddying material piping from the shield machine main body side is also connected to the same space, so the muddying material can be cut into the face without any protrusions inside the chamber. Since it can be sent to the side, the shield type excavator can excavate without hindering the flow of earth and sand within the chamber.

Since the annular space is formed as a continuous space in the circumferential direction, muddying material can be stably supplied even while the Kattufu Ace is rotating, and excavation work can be carried out at the same time. can.

Furthermore, by arranging the scraper facing into the annular space on the cutter drum, the slurry material can be smoothly supplied to the face side of the cutter without solidifying in the space.

(Example) The present invention will be described below with reference to the illustrated embodiments.

21 is a shield main body, 22 is a shield jack, 23 is a ball bearing type large diameter cutter bearing, and a gear portion is provided on the outer diameter side.
A plurality of cutter rotation drive sources 24 having small gears meshing with the same gear portion are disposed.

25 is the bulkhead and bearing housing,
26 is a cutter ace, 27 is a cutter drum equipped with an intermediate beam, and a plurality of holes 27a are provided in the intermediate beam part so that the excavated soil flows into the center part from the outer periphery.
is provided. 28 is the inner sediment seal, 2
9 is a screw conveyor.

The cutter drum 27 in the cutter bearing part and the shield machine main body side have a pair of front and rear outer circumferential earth and sand seals 3.
0 and 31 are provided, and an annular space A that continues in the circumferential direction is formed between both seals 30 and 31. Note that, in the case of high pressure, a plurality of rows of rear earth and sand seals 31 may be provided.

In the annular space A, there is a front slurry which is disposed on the face side of the cutter ace 26, whose front end communicates with a slurry material discharge port 32 equipped with a backflow prevention valve, and which is buried across the cutter ace 26 and the cutter drum 27. The rear end of the mud pipe 33 and the rear end of the mud pipe 3 are connected to a mud supply valve 34 disposed in the bulkhead/bearing housing 25.
The front ends of 5 are connected.

Furthermore, a scraper 36 facing into the annular space A is disposed on the outer peripheral surface of the cutter drum 27.

Since the illustrated embodiment is configured as described above, the muddy material supplied from the rear muddying material pipe 35 is supplied to the annular space A, and from the same space A via the front muddying material pipe 33. The slurry material is supplied to the face side from the muddy material discharge port 32 of the cutter ace 26, and the face is stabilized so that stable excavation by the shield type excavator can be performed.

In addition, the muddy material filling the annular groove A may solidify on the inner peripheral surface while the shield type excavator is operated for a long period of time, or the muddy material may settle and form an annular shape when the excavator is stopped. Although there is a risk that the slurry material will solidify in the lower part of the space A, as the cutter drum 27 rotates, the scraper 36 prevents the mud from solidifying on the inner peripheral surface of the annular space A.

According to the embodiment, one row of annular spaces A is provided, but a plurality of rows may be provided. Allocated to groups.

Furthermore, in the embodiment described above, the outer ring side of the cutter bearing rotates and is connected to the rotating cutter drum 27, but when the inner ring side of the cutter bearing rotates, the seals 28, 30, and 31 are reversed from the inside to the outside compared to the illustrated embodiment. Since the annular space A is formed on the inner diameter side of the cutter drum 27, the rear muddying material pipe 35 and the valve 34 are provided on the outer circumferential side of the screw conveyor 29 and on the inner diameter side of the cutter bearing 23.

According to this embodiment, the front muddy material pipe 33 and the rear muddy material pipe 35 are placed in the annular space A formed between the front and rear earth and sand seals 30 and 31 arranged on the rotation side of the cutter bearing 23. By being connected, the muddy material can be sent to the face side without creating any protrusions inside the chamber, so the shield type excavator can excavate without interfering with the flow of earth and sand inside the chamber. Further, a scraper 36 facing into the annular space A provided on the outer peripheral surface of the cutter drum 27
This prevents the muddying material from solidifying on the inner circumferential surface of the space A.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing an embodiment of a shield type tunnel excavator according to the present invention, and FIG. 2 is a longitudinal side view of a conventional shield type tunnel excavator. 21...Shield body, 25...Bulkhead/bearing housing, 26...Katsuta ace, 27...Katsuta drum, 30...Front earth and sand seal, 31...Rear earth and sand seal, 32...Mud material discharge port, 33... ...Front mud adding material piping, 35... Rear mud adding material piping, 36... Scraper, A... Annular space.

Claims (1)

[Scope of utility model registration request] A front muddying material pipe and a rear muddying material pipe are connected to a circumferentially continuous annular space defined between the cutter drum and the shield machine body via a sand seal, and and a scraper facing into the annular space, the front muddy material pipe is buried in the cutter drum, the front end is connected to the muddy material discharge port of the cutter ace, and the rear muddy material pipe is connected to the muddy material discharge port in the shield machine. A shield type tunnel excavator characterized by being connected to a mud material supply section.