JPS62137398A - Large-section shield excavator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to large-section shield excavation.

[Prior art] Generally, in large area (large diameter) shield tunneling machines,
A peripheral support method or an intermediate beam support method is adopted. FIG. 3 shows an example of an intermediate beam support system, in which an intermediate beam b supporting a cutter frame a is supported by a bearing attached to an auxiliary frame d at the front inside the shield frame C, and a drive motor e A cutter gear 9 mating with the pinion [1li41] is connected to the intermediate beam b.

[Problems to be Solved by the Invention]However, in the case of an even larger cross-section shield, the conventional method of excavating a large cross-section shield, (+) The diameter of the bearing becomes smaller and the bearing 11 is divided [1]
Since it is a single piece, its accuracy is inferior to that of a one-piece type.

(n) Since the cutter gear 1'7g has a large diameter, it also has a split structure and has poor accuracy.

(g) Since the accuracy of the bearing 11 is poor, the center runout of the cutter frame a is large, and the seal member is not reliable due to the harsh conditions on the seal contact surface.

(f) It was difficult to detect the wear status of the cutter bit i and cutter frame a, and the status of the face and top of the ground.

It had problems such as:

Book 5 Somei was created in light of this situation.

[Means for Solving the Problems] The present invention supports the axial center of the cutter frame L1 by a hollow center shaft, and supports the front and rear positions of the center shaft by integral bearings within the shield frame. , and has a structure in which an integral ring-shaped cutter gear is attached to the outer periphery of the center shaft, a cutter drive device is connected to the cutter gear, and cutter spokes are made hollow to communicate with the center shaft.

[Function] By supporting the cutter frame with a hollow center shaft, the reliability of the cutter drive section and cutter seal section is increased.

Implementation example] Hereinafter, 31 embodiments of the present invention will be explained with reference to the drawings.

In Figures 1 and 2, 1 is a shield frame, 2
, 3 are a ring-shaped front supplementary frame and a rear supplementary frame provided in the shield frame 1, 4 is a slit for taking in dirt formed in the front face of the cutter frame 5, and 6
Adjust the opening area of the slit 4 with the opening adjustment jack 7! 1 is the opening/closing plate, 8 is the cutter bit 9 installed [nota cutter spoke, 19 is the copy cutter.

The axial center of the cutter frame 5 is supported by a hollow center shirt 1 having a relatively large diameter, and the center shirt 1 is supported by the center shirt 1.・The front part of the foot 10 is attached to the front bulkhead 1
One part is supported using an integral radial bearing 12 and an integral thrust bearing 13, and the rear end is supported by an integral radial bearing 15m1 at the rear bulkhead 14 part.
A ring-shaped cutter gear 16 is attached to the outer periphery of the intermediate portion of the center shaft 10, and a pinion 26 of a cutter drive device 17 consisting of a motor and a speed reducer is meshed with the cutter gear 16. The cutter spoke 8 is also formed hollow, and the cutter spoke 8 is located at the outer periphery of the front end of the center shaft 10 through the manhole 2.
7, and hydraulic power units i to 25 and controls (IIn
A device, a manlock 29 for pressurized air, etc. are mounted inside the center shaft 10.

18 is a sealing member provided in the bearing 12 part, 20 is a mud feeding pipe,
21 is a mud removal pipe, 22 is an agitator, 23 is a shield jack, and 24 is a segment 1 ~. Furthermore, when the outer diameter of the shield frame 1 is about 16 m, the center shaft 10
The diameter is approximately 3 m.

With this configuration, when the drive device 17 is driven, the center shaft 10 rotates through the engagement between the pinion 26 and the cutter gear 16, and the cutter frame 5 further rotates. At this time, the center shaft 10 is supported by bearings 42.13 and 15 at the front and rear positions in the axial direction, and since these bearings 12, 13, and 15, as well as the cutter gear 16, are of an integrated structure, the accuracy is reduced. Good stable rotation condition is obtained 1q. Therefore, the reliability of the sealing member 18 is also improved because there is less core removal.

Furthermore, since the center shaft 10 and the cutter spokes 8 are in communication, and a pressure air manlock 29 is provided inside the center shaft 10 for safety, no pressure air can be leaked into the cutter frame 5 (1). Since the worker can enter into the cutter spoke 8, the I♀ wear detection A9 of the cutter bit 9 and cutter frame 5, which was conventionally done indirectly, and the supply of new pits, which had gone out to the face, can now be carried out internally. It can be easily done from In addition, you can directly check the conditions at the face and top of the mountain.

Furthermore, a hydraulic power unit 25 and control equipment are mounted inside the center shaft 10, and the operation of cutters (Q) such as the slit 1 to the opening adjustment jack 7 and the copy cutter can be controlled without using a rotary joint. Since it is possible to perform this operation within Δ, stable control is possible, and it is also possible to check for oil leakage from the hydraulic piping, making maintenance easy.

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

[Effects of the Invention] As explained in IX below, according to the shield excavator of the present invention, (D) Since a hollow center shaft is used to support the cutter frame, the cutter bearing and the cutter gear have the following features:
Since a highly accurate integrated type can be used, assembly accuracy is improved and the reliability of the cutter rotation drive unit is high.

(It) Since the rotation of the center shirt becomes stable, the reliability of the sealing mechanism improves.

(D) Since the bearing diameter and seal diameter can be made smaller than in the conventional case, these mechanical loss resistances are reduced.

■ Stable control is possible by mounting the hydraulic power unit and control equipment attached to the cutter inside the center shaft.

<V) By making the cutter spoke hollow and filled with heavy oil (with the center shaft), it is possible to detect the thickness ratio of the cutter pit 1~ and the cutter frame, easily check if a new bit is being supplied, and directly check the condition of the face and the top of the base 111. .

It has excellent effects such as 1q.

[Brief explanation of drawings]

FIG. 1 is a cutaway side view of the large-section shield tunneling machine of the present invention;
FIG. 2 is a front view (left half), and FIG. 3 is an explanatory diagram showing an example of a conventional shield tunneling machine. 1 is a shield frame, 5 is a cutter frame, 10 is a center shaft, 11 is a front bulkhead, 12 is a radial bearing, 13 is a thrust 1-IIIll bearing, 14 is a rear bulkhead, 15 is a radial bearing, 1G is a cutter gear, 17 is the cutter drive neck, 18 is the seal part (O, 2
6 indicates a pinion.

Claims (1)

[Claims] 1) The axial center of the cutter frame is supported by a hollow center shaft, and the front and rear positions of the center shaft are supported by integral bearings within the shield frame, and an integral ring-shaped part is attached to the outer periphery of the center shaft. Install a cutter gear, connect a cutter drive device to the cutter gear,
Furthermore, the large cross-section shield excavator is characterized in that the cutter spokes are hollow and the center shaft and cutter spokes have a communicating structure.