JPH0160640B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shield excavator used in tunnel excavation work, and particularly to a closed mechanical shield excavator.

An example of a conventional shield tunneling machine of this type is shown in FIG. That is, a cutter frame b having a cutter bit c on the front side,
The shield frame a and the cutter frame b are rotatably supported inside the shield frame a.
A seal d is used to seal the space between the cutter frame b, and a bulk head e is sealed at the rear end of the cutter frame b via a seal f to form a closed mechanical shield. A screw conveyor g consisting of a conveyor frame h having an opening i for receiving earth and sand at its tip, and a screw j rotatably housed in the conveyor frame h.
Insert the tip of the bulk head e through the bulk head e,
The excavated earth and sand is discharged from inside the cutter frame b by a screw conveyor g.

However, in this conventional method, the tip of the fixed conveyor frame h and the rotating cutter frame b
There is a risk that gravel may get stuck in the gap k between the cutter frame b and damage the equipment, and there is also the disadvantage that it is impossible to inspect the interior because workers cannot enter inside the cutter frame b. Also, when replacing the cutter bit c, the work was done outside of the cutter frame b.

In order to eliminate the drawbacks of the conventional method, the present invention attempts to allow a worker to enter and exit the cutter frame. A cutter frame having a cutter chamber inside is arranged rotatably via a bearing and a seal, and a cylindrical member is concentrically protruded from inside the cutter chamber at the center of the front face of the cutter frame. A cutter bit is attached to the space formed by the cylindrical member on the outside, and an openable and closable ventilation hole is provided, and a cutter bit is installed inside the cutter chamber of the cutter frame so as to be located on the outer periphery of the cylindrical member. Cutter spokes each having a hollow space are arranged radially, a cutter bit is provided on the front surface of the cutter spoke, and a cutter slit communicating with the cutter chamber is provided near the cutter spoke, and the cylindrical shape is A manhole leading into the space of the cutter spoke is formed in the cutter spoke, and a hollow cylindrical center frame having a manlock at the rear end is arranged concentrically within the shield frame and the cutter frame, and the tip opening of the center frame is formed. is brought into contact with the end opening of the cylindrical member via a seal so that the member can rotate with respect to the center frame, and an openable and closable manhole communicating with the inside of the cutter chamber is provided on the outer periphery of the tip of the center frame. The present invention is characterized in that an opening is provided at the top of the tip of the center frame, and a soil chute at the tip of the screw conveyor disposed within the center frame is connected to the opening.

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

As shown in FIGS. 2 to 5, a cutter frame 2 is provided with a cutter chamber 19 inside the cutter spokes 4 having a hollow space inside which are fixedly disposed in a radial manner to which a large number of cutter bits 3 are attached. , is rotatably and liquid-tightly supported inside the tip opening of the shield frame 1 via a bearing 5 and a seal 6, and at the rear end of the cutter frame 2 is a gear having teeth carved on the outer periphery of a ring member. 7
The drive gear 10 of the cutter motor 9 is fixed to the inner wall of the shield frame 1 with a seal 8 interposed between the shield frame 1 side and the shield frame 1 side.
and the gear 7, and the cutter motor 9
The cutter frame 2 is rotated through the gears 10 and 7 by the drive of A center frame 11 through which humans can pass is arranged,
The center frame 11 extends forward and has a front end opening protruding from the center of the cutter frame 2. The cylindrical member 12 rotates with respect to the center frame 2 through a seal 13 at the end opening of the cylindrical member 12. At the same time, the outer periphery of the central portion of the center frame 11 is brought into contact with the cutter frame 2 through the partition wall seal 14 so that the cutter frame 2 can rotate, thereby forming a closed mechanical shield. A conveyor frame 16 having a dirt chute 17 at its tip is located within the center frame 11 and is constructed integrally with the center frame 11.
A screw 18 is rotatably housed and constitutes a screw conveyor 15.

In the above, cutter slits 26 communicating with the cutter chamber 19 are provided on both sides of the cutter spokes 4 on the front surface of the cutter frame 2, as shown in FIG. 3, so that excavated earth and sand can be taken into the cutter chamber 19. A cutter bit 3' is attached to the outer side of the cylindrical member 12 at the center of the front surface of the cutter frame 2 to enable excavation. Further, the rear portion of the cutter spoke 4 extends along the inner wall of the cutter frame 2 in the axial direction of the cutter frame 2, as shown in FIGS. 1 and 5. Further, the upper edge of the earth and sand chute 17 of the conveyor frame 16 is connected to the periphery of an opening 27 formed by cutting out the top of the tip of the hollow cylindrical center frame 11 to a required length and width. .

In addition, 20 is an open/close type manhole that leads to the inside of the cutter chamber provided on the outer periphery of the tip of the center frame 11, 21 is a manhole that leads to the inside of the cutter spoke 4 provided on the cylindrical member 12, 22 is a valve provided on the cutter frame 2, 23 is an air pipe;
24 is a manlock formed at the rear end of the center frame 11, and 25 is a ventilation hole.

With the above configuration, when the cutter motor 9 is driven to rotate the cutter frame 2, the face is excavated by the cutter bits 3 and 3', and the excavated earth and sand enters the cutter chamber 19 through the cutter slit 26. As shown in FIG. 6, the dirt that has entered the cutter chamber 19 accumulates in the lower part of the cutter chamber 19 due to gravity, but since the cutter chamber 19 is also rotating, it protrudes into the cutter chamber 19. The cutter spoke 4 scoops up the earth and sand to reach the upper part of the opening of the earth and sand chute 17, and it falls again into the earth and sand chute 17 below by gravity, and then passes through the earth and sand chute 17 and is sequentially transferred into the screw conveyor 15. The incoming screw conveyor 15 is driven to transport the material backward and discharge it. At this time, in the present invention, the cutter frame 2 and the conveyor frame 16
Since the cylindrical member 12 and the center frame 11 are disposed between the cutter frame 2 and the conveyor frame 16 to prevent gravel from entering, the problem of gravel getting caught between the cutter frame 2 and the conveyor frame 16 does not occur.

When inspecting the interior during excavation work, a worker enters the center frame 11 from the manlock 24, passes through the center frame 11 to the cutter frame 2, and performs the inspection. That is, the center frame 11 is extended forward and the front end opening is in contact with the end opening of the cylindrical member 12 at the center of the front surface of the cutter frame 2, so that the operator can , the part inserted inside the cutter chamber 19 at the tip of the center frame 11 can be accessed at any time, and after the rotation of the cutter frame 2 is stopped, the opening/closing type manhole 2 formed on the outer periphery of the center frame 11 is opened.
By passing through the cutter chamber 19, it is possible to enter and inspect the cutter chamber 19, and the cylindrical member 12
It is also possible to inspect the face using the valve 22 inside. Furthermore, since the worker can enter the space of the cutter spoke 4 through the manhole 21, the cutter bit 3 can be replaced without going outside.

If there are workers on the face, Manrock 2
4 and insert the air pipe 23 into the center frame 11.
Supply more air to pressurize the sealed room. Next valve 2
2 is opened, pressure is applied to the face through the valve, and then the worker comes out to the face. In this case, conventionally pressurized air is applied to the entire shaft when exiting to the face, but according to the present invention, this is no longer necessary.

As described above, according to the shield excavator of the present invention, a cylindrical center frame is disposed approximately in the center of the closed mechanical shield, and the tip opening of the center frame is connected to the cutter frame through the seal. Since the end opening of the cylindrical member protruding inside the center of the front surface is rotatably abutted, (i) the space between the screw conveyor and the front of the cutter frame is surrounded by the cylindrical member and the center frame; There is no risk of damage to the equipment as there is no chance of debris getting trapped there.

(ii) Since workers can enter the cutter chamber and cylindrical members through the hollow center frame, it is easy to inspect the inside of the cutter chamber and the face via the valve.

(iii) A worker can enter the space inside the cutter spoke from the center frame through a manhole formed in the cylindrical member, and the cutter bit can be easily replaced from inside the cutter spoke.

(iv) By closing the manlock, pressure can be created inside the center frame, so by opening the vent that can be opened and closed, it is possible to easily apply pressure to the face from the front of the cutter frame, without applying pressure to the entire shaft. You can still get to the face.

It can produce excellent effects such as

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a conventional closed-type mechanical shield tunneling machine, FIG. 2 is a schematic cross-sectional view of a shield tunneling machine of the present invention, FIG. 3 is a view taken in the - direction arrow of FIG. Fig. 2 is a -direction arrow view, Fig. 5 is a 2nd
6 is an explanatory view showing the flow of earth and sand excavated by the shield excavator shown in FIG. 2. 1... Shield frame, 2... Cutter frame, 3, 3'... Cutter bit, 4... Cutter spoke, 5... Bearing, 6, 8, 14... Seal, 11
...Center frame, 12...Cylindrical member,
15... Screw conveyor, 16... Conveyor frame, 17... Sediment chute, 19... Cutter chamber, 20, 21... Manhole, 24... Manlock, 25... Ventilation hole, 26... Cutter slit, 2
7...Opening.

Claims (1)

[Claims] 1 Inside the tip opening of a cylindrical shield frame, a disc-shaped cutter frame having a cutter chamber inside is rotatably arranged via a bearing and a seal, and inside the cutter chamber at the center of the front surface of the cutter frame, A cylindrical member is protruded concentrically, a cutter bit is attached to the space formed by the cylindrical member on the outside of the front surface of the cutter frame, and an openable and closable ventilation hole is provided. In the cutter chamber, cutter spokes having a hollow space formed inside are arranged radially so as to be located on the outer periphery of the cylindrical member, and a cutter bit is provided on the front surface of the cutter spoke, and the cutter spoke A cutter slit communicating with the cutter chamber is provided near the spoke, a manhole communicating with the cutter spoke space is formed in the cylindrical member, and a hollow cylindrical center frame having a manlock at the rear end is connected to the shield frame and the manhole. disposed concentrically within a cutter frame, and bringing the tip opening of the center frame into contact with the end opening of the cylindrical member via a seal so that the member can rotate with respect to the center frame; An openable manhole leading to the inside of the cutter chamber is provided on the outer periphery of the tip of the center frame, and an opening is provided at the top of the tip of the center frame so that the earth and sand chute at the tip of the screw conveyor disposed within the center frame can be A shield excavator characterized by being connected to an opening.