JPH0144619Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tunnel boring machine that can easily make direction corrections.

An example of a conventional tunnel boring machine is the one shown in Fig. 1, in which a cutter b installed at the tip of an excavator a is connected to a screw conveyor driven by a propulsion drive device d installed at the bottom of a shaft c. It is fixed to the tip of the scree shaft f of e, and is rotated by the drive of the scree shaft f to excavate the face g. The excavated earth and sand is then conveyed to the shaft c by a screw conveyor e.

Further, the excavator a is propelled forward together with the screw conveyor e via the lining pipe h by the propulsion drive device d, and a new lining pipe h is inserted between the rearmost lining pipe h and the propulsion drive device d. A screw conveyor e was added, and further excavation was carried out.

In the above-mentioned conventional apparatus, when excavating a spring-fed ground, it is desirable to operate with the screw conveyor e filled with earth and sand in order to prevent the earth and sand at the face g from collapsing. However, the screw conveyor e
When excavation is performed with the inside filled with earth and sand, the screw torque for conveying the earth and sand increases, and the screw shaft f and the propulsion drive device d become larger. Therefore, the screw conveyor e is operated without being filled with earth and sand, but the face g tends to collapse in spring water ground, making the direction of excavation of the excavator a unstable and causing it to deviate from the planned line. . For this reason, conventionally, the tip outer cylinder j is tilted with respect to the tunnel axis by a hydraulic jack i installed on the excavator a, and this part receives compacted soil from the ground k to obtain the lateral force necessary for direction correction. was.

However, in the case of the above-mentioned tunnel boring machine,
If the ground k is hard, the thrust of the hydraulic jack i will be insufficient and the tip outer cylinder j will be tilted and difficult. Therefore, the thrust of the hydraulic jack i must be increased, and the device will become larger. There was a problem.

In view of this, the present invention has been developed to apply lateral force from the ground to the outer cylinder at the tip of the excavator by pushing the outer cylinder at the tip of the excavator in a direction crossing the tunnel axis direction when the ground is hard. The purpose is to make it possible to correct the direction of a tunnel boring machine.
A frame protruding forward from the intermediate outer cylinder is fixed to the intermediate outer cylinder into which the tip of the rear outer cylinder is inserted into the rear end, and a spherical bearing is attached to the portion of the frame that protrudes forward from the intermediate outer cylinder. The tip outer cylinder is fitted onto the spherical bearing to support the tip outer cylinder, and the intermediate outer cylinder and rear outer cylinder are arranged in parallel in the rear outer cylinder, intermediate outer cylinder, and front outer cylinder. In addition, a ribbon screw conveyor including a rotating casing rotatably supported by the rear outer cylinder and a ribbon screw fixed to the inner periphery of the rotating casing is provided, and a tip end is attached to the tip of the ribbon screw conveyor. A cutter is attached to the front of the outer cylinder, and a hydraulic jack is provided in the intermediate outer cylinder to tilt the tip outer cylinder with respect to the axis of the intermediate outer cylinder.

Hereinafter, embodiments of the present invention will be described based on the drawings.

2 and 3 show an embodiment of the present invention, in which an excavator 1 installed at the tip of a tunnel is provided with a tip outer cylinder 2, an intermediate outer cylinder 3, and a rear outer cylinder 4. A serpentine seal 5 is installed between the tip outer cylinder 2 and the intermediate outer cylinder 3 to prevent earth and sand from entering the outer cylinders 2 and 3. It is tapered and inserted into the rear end side of the intermediate outer cylinder 3, and a seal 6 is fitted in the gap between the outer cylinders 3 and 4.

The funnel-shaped enlarged end of the casing 9 of the ribbon screw conveyor 8 is fixed to a cylindrical frame 7 fixed to the inner periphery of the intermediate outer cylinder 3 so as to expand toward the front of the tunnel, and the frame of the fixed part is 7
Frame 10 fixed to the inner periphery of the tip and the outer tube 2 of the tip
A sill 11 is fitted between the outer periphery of the cylindrical part.

Spherical bearings 12 and 13 are fixed to the inner periphery of the tip outer cylinder 2 and the outer periphery of the frame 7 of the intermediate outer cylinder 3, and the spherical bearings 12 and 13 abut on the spherical parts, and the tip outer cylinder 2 is connected to the tunnel. It can be inclined with respect to the axis L (that is, the axis of the intermediate outer cylinder 3).

A plurality of brackets fixed to the outer periphery of the casing 9 of the ribbon screw conveyor 8 have hydraulic jacks 14 whose axes are approximately parallel to the tunnel axis, respectively, pivoted by pins, and the tips of the hydraulic jacks 14 are fixed to the casing 9. The end of a ring 16 is pivotally attached to the bracket via a pin 15, and by operating the hydraulic jack 14, the link 1
The direction of the tip outer tube 2 can be changed by pushing the tip outer tube 2 with the tip 6.

In the figure, 17 is a pinion that can be driven by a propulsion drive device (not shown), 18 is a gear fixed to the rotating casing 19 of the ribbon screw conveyor 8 and meshed with the pinion 17, and 20 is the rear end of the rotating casing. 19 Ribbon screw fixed to the inner periphery and having a cutter 21 fixed to the tip, 2
2 is a ribbon screw conveyor for discharging earth and sand fed from the ribbon screw conveyor 8; 23 is a lining pipe that prevents collapse of the ground 25 and transmits the thrust of the propulsion drive device to the excavator 1; 24; is the face.

Next, the operation of the present invention will be explained.

The pinion 1 is driven by a propulsion drive device (not shown).
7. Rotate the ribbon screw 20 and cutter 21 via the gear 18 and rotating casing 19;
A face 24 is excavated by the cutter 21, and the excavator 1 is pushed through the lining pipe 23 by the propulsion drive device to advance through the earth. Further, the excavated earth and sand is discharged to the shaft by the ribbon screw conveyor 8 and the screw conveyor 22.

During work, for example, if the upper part of the face 24 collapses,
The propulsion resistance at the upper part of the face decreases and the direction of excavation shifts upward, but in this case, the position is corrected by tilting the tip outer cylinder 2. That is, the link 16 is rotated by the required hydraulic jack 14,
As shown in FIG. 3, the upper link 16 inclines the tip outer cylinder 2 downward. Therefore, the tip outer cylinder 2 receives a downward lateral force and returns to a predetermined straight line.

Even when the ground is hard and it is difficult to tilt the tip outer cylinder 2, the hydraulic jack 14 operates the link 16, and the link 16 tilts the tip outer cylinder 2.
When a force is generated to tilt the tip outer tube 2, the tip outer cylinder 2 receives a lateral force from the ground 25 for direction correction, and the direction can be reliably corrected even if the tip outer tube 2 does not tilt. . Further, even if the tip outer cylinder 2 is tilted, no large lateral force is applied to the cutter 21, so that direction correction can be performed even more easily.

FIG. 4 shows another embodiment of the present invention. In the previous embodiment, the tip outer cylinder 2 was inclined by a link 16, but in this embodiment, a plurality of hydraulic jacks 14 are connected to the ribbon screw conveyor 8. They are arranged radially between the outer periphery of the casing 9 and the inner periphery of the tip outer cylinder 2. With such a configuration, the tip outer cylinder 2 can be directly tilted by the hydraulic jack 14.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

According to the tunnel excavating machine of the present invention, even if the ground is hard, if a force is generated to tilt the tip outer cylinder of the excavator, even if the tip outer cylinder does not tilt. Since lateral force acts on the tip outer cylinder from the ground, direction correction can be performed easily and reliably, and the direction can be corrected without tilting the tip outer cylinder, so the thrust of the hydraulic jack is small. As a result, the device is smaller and cheaper, and even if a lateral force is applied to the outer cylinder at the tip, no lateral force is applied to the cutter, making it easier to correct the direction. It can be effective.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a conventional tunnel boring machine, Figure 2
The figure is an explanatory diagram of one embodiment of the tunnel boring machine of the present invention, and Figure 3 is an enlarged view of the vicinity of the outer cylinder at the tip of Figure 2.
FIG. 4 is an explanatory diagram of another embodiment of the tunnel boring machine of the present invention. In the figure, 1 is an excavator, 2 is a tip outer cylinder, 3 is an intermediate outer cylinder, 8 is a ribbon screw conveyor, 12, 1
3 is a spherical bearing, 14 is a hydraulic jack, 16 is a link, 20 is a ribbon screw, and 21 is a cutter.

Claims (1)

[Scope of utility model registration request] A frame protruding forward from the intermediate outer cylinder is fixed to the intermediate outer cylinder into which the tip of the rear outer cylinder is inserted into the rear end side, and a spherical bearing is attached to the portion of the frame that protrudes forward from the intermediate outer cylinder. The tip outer cylinder is fitted onto the spherical bearing to support the tip outer cylinder, and is disposed in the rear outer cylinder, the intermediate outer cylinder, and the front outer cylinder in parallel with the intermediate outer cylinder and the rear outer cylinder. In addition, a ribbon screw conveyor including a rotating casing rotatably supported by the rear outer cylinder and a ribbon screw fixed to the inner periphery of the rotating casing is provided, and a tip end is attached to the tip of the ribbon screw conveyor. 1. A tunnel excavating machine, characterized in that a cutter is attached to be located in front of the outer cylinder, and a hydraulic jack is provided in the intermediate outer cylinder to tilt the tip outer cylinder with respect to the axis of the intermediate outer cylinder.