JPS62264293A - Expansion shielding 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 an expanding shield excavation machine that excavates a primary shield tunnel and then enlarges the primary part of the same shield tunnel.

(Prior art) Fig. 2 shows a conventional enlarged shield 0 excavator of this type,
A cutter (bl bearing (cl) and a cutter drive motor (
d) is provided.

In the figure (61 is a cutter drum), which is connected to the outer rotation part of the bearing (Q), and a small gear (fl) fixed to the drive shaft of the motor (d) is attached to a gear part provided on the outer circumference of the rotation part
are engaged with each other, and the cutter (b) is driven and rotated by the motor (1).

In the figure, (g) and (h) are the earth and sand seals, (1) is the bearing housing, (j is the earth and sand seal, (k) is the segment guide, (1) is the cutter bit, and (the direction is the shield jack) , (n) is a tail notskin, and ■ is a secondary segment.

Then, the cutter (b) is used to cut the existing primary sedamen)
(A), and a secondary segment (B) formed at the rear of the shield body (a) as the shield body (a) is excavated.
The shield jack (m) is extended by taking the reaction force and excavates the enlarged part.

(Problem to be Solved by the Invention) In order to excavate an expanded area using an expanding shield excavator, it is necessary to create a launch base for assembling the machine, and the smaller the sweep of the base, the smaller the , is advantageous. That is, the shorter the length of the fuselage, the more advantageous it is.

However, in the conventional closed-type expanding shield machine, a large cutter bearing device and a cutter drive device are disposed within the shield body, making it difficult to shorten the machine length.

(Means for Solving the Problems) The present invention is intended to solve the above problems, and has the following features: - In an expanding shield excavator for cutting the next segment, a part of the shield main body is cut from the bulkhead part to the front part of the shield body. It is characterized by an extension extending beyond the opposed cutters and extending into the primary segment in the direction of movement of the shield excavator, and a cutter bearing and a cutter drive device being provided in the extension. The purpose is to provide an enlarged seed/I/do aircraft with a shortened pilot length.

(Function) As described above, the expanding shield machine according to the present invention provides a cutter bearing and a cutter drive device in the extension of the bulkhead portion of the shield body that protrudes forward from the cutter and extends into the next segment. The cutter driving device mounted on the extension is actuated to drive and rotate the cutter via a cutter bearing disposed on the extension, while cutting the existing primary segment with the cutter. This is an expanded secondary shield excavation.

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

In Fig. 1, (1) is the shield body of the expansion shield excavator, (2) is the shield jack, (3) is the tail gutskin, (4) is the bulkhead provided at the front of the shield body,
(5) is a cutter disposed on the front surface of the turning section (4), and (6) is a cutter bit.

The bulkhead part (4) has an existing primary segment (Al
A cylindrical pairing tooth housing (7) extending inward is fixed with bolts, etc., and a cutter bearing (8) is mounted on the outer periphery of the tip of the pairing tooth housing (7).
The inner diameter fixed side is fixed to the bearing housing (forced by bolts, etc.), and the outer diameter rotating side is attached to the cutter drum (9) which extends concentrically with the earring housing (7) in front of the cutter (5). is fixed.

Further, a gear portion provided on the outer periphery of the outer diameter rotation side of the cutter bearing (8) is connected to the bearing housing (7).
The cutter (5) is driven and rotated by meshing with a small gear αD fixed to the drive shaft of a cutter drive motor αO mounted on the distal end surface of the cutter (5) and operating the motor αυ.

In the figure, az is the primary sedamen caused by the excavation of the shield machine) (
A) Segment seal that seals groundwater and earth and sand while sliding on the inner peripheral surface (13 and 14 are earth and sand seals that are placed on the rotating sliding surface and prevent the intrusion of groundwater and earth and sand.

Note that the earth removal device is not shown in the figure.

When assembling the shield excavator at the starting base prior to excavation work using the illustrated shield excavator, the front side of the cutter (5), that is, the primary segment in the direction of movement of the shield 9 excavator) (Al
A cutter drive motor (1ω) and a cutter bearing (8
) is disposed in the bearing housing (7) that protrudes forward from the partition wall (4), so that the shield body has a smaller diameter compared to the case where the cutter drive motor and cutter bearing are disposed inside the shield body. If the length of the aircraft is short, the space at the launch base can be reduced.

Therefore, when carrying out the expanded shield construction method using the shield excavator shown in the figure, the cutter (5
) is driven and rotated by the same cutter (5), and the shield gear is excavated by the same cutter (5), and the shield gear By extending Tsuki (2),
This is an expanded secondary shield excavation.

Although the present invention has been described above with reference to embodiments, the present invention is of course not limited to such embodiments, and may be modified in various designs without departing from the spirit of the present invention. For example, a gear portion may be provided on the outer peripheral surface of the cutter bearing (8) on the inner diameter side, and the cutter drive motor a may be disposed on the inner diameter side of the cutter bearing (8).

(Effects of the Invention) As described above, in the expanding shield excavator according to the present invention, the cutter bearing and the cutter drive device are not installed in the shield main body, but are installed oppositely from the partition wall of the shield main body to the front face of the shield main body. By providing a protruding extension that extends beyond the cutter in the direction of movement of the shield excavator, and providing it on the extension, the space for the launch base of the expanded shield excavator is reduced, and the construction period for constructing the launch base is reduced. The time is shortened and construction costs are reduced.

Further, according to the present invention, since there is no cutter bearing and cutter drive section within the shield body, the effective space within the shield body is expanded, which is advantageous for various operations such as segment assembly work and surveying after excavation.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of an expanding shield tunneling machine according to the present invention, and FIG. 2 is a vertical cross-sectional view of a conventional expanding shield tunneling machine. (11...Shield 9 main body, (4)...Partition wall part, (
5) Cutter, (7) Bearing housing, (8) Cutter bearing, αα Cutter drive motor, (A) Next segment, 03) Secondary segment. Figure 2

Claims (1)

[Claims] In an expansion shield excavator that cuts a primary segment, an extension part is provided that protrudes from the bulkhead part of the shield main body, beyond the cutter installed opposite to the front face of the shield body, and extends into the primary segment in the direction in which the shield excavator moves. , an enlarged shield excavator characterized in that a cutter bearing and a cutter drive device are provided in the extension part.