JPS5873692A - Shield drilling machine - 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 The present invention relates to a shield excavator in which a cutter disk tilts with respect to a shield body.

There is some kind of obstacle in front of the tunnel that is being excavated straight ahead.
When excavating by bypassing this, the shield excavator itself also
It is desirable to have a structure that bends at appropriate points according to the curvature of the tunnel.

In response to this requirement, conventionally, as shown in FIG. 1, a tail plate 2 attached to the rear part of a shield tunneling machine 1 is bent with respect to a shield main body 8.

For example, there is a type that connects the tail plate 2 with pins 4 provided on the rear upper and lower surfaces of the shield main body 3 to enable the shield excavator 1 to bend. In addition, although not shown, several hydraulic jacks are interposed between the shield main body and the tail plate or the rear shield main body, and the amount of extension of the jacks is made different on the left and right sides, for example, so that it can be moved in a desired direction. There is something that makes bending possible.

However, as shown in FIG.
is housed in a reducer case 7, and this reducer case 7 is fixed within the shield body 3 via a support member 8, or is driven by a hydraulic motor 9 as shown in FIG. A cylindrical support 11 for rotating the cutter disk 5 via a ring gear 10 is supported in the shield body 8 by a radial bearing 12.

When excavating a tunnel in a curved manner with this type of shield excavator 1, a plurality of shield jacks are installed at the rear of the shield excavator 1 to press the ends of segments already constructed to generate excavation thrust. The direction of the shield excavator 1 is changed by varying the amount of extension of the tunnel and by over-excavating a portion of the tunnel in the radial direction.

This is because, as described above, the cutter disk 5 is fixed to the shield body 8 via the reducer case 7, etc., so that the center portion 5b of the tip of the cutter disk 5 is aligned with the desired curved axis 13 of the tunnel. It is based on the fact that it cannot be moved (see Figure 1).

In the conventional curved excavation by over-excavation, the amount of expansion is limited due to the strength of the fixed part of the copy cutter 48, and the over-excavated earth and sand from around the cutter disk is not completely swallowed, so the over-excavated cross-sectional space was small compared to the required amount of over-excavation, making curved excavation extremely difficult.

In addition, when excavating around steep curves, auxiliary methods such as ground improvement were required.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a shield excavator that can easily excavate a tunnel with a small radius of curvature of 1° of curvature.

Its features include a reducer case that houses the reducer that drives the cutter disk, and a pedestal that is fixed to the inner wall of the shield body to support the outer periphery of the reducer case. an annular spherical bearing that allows the reduction gear case to tilt; a tilting hydraulic jack that is attached to the back of the reduction gear case and the shield body; The shield body has a shield jack that applies digging thrust to the pedestal of the spherical bearing, and a tail plate that is bendably connected to the rear part of the shield body.

Hereinafter, the present invention will be explained in detail based on examples thereof.

FIG. 8 is a plan view of the shield excavator 1 according to the present invention,
It consists of a shield body 8 and two tail plates. A tiltable cutter disk 5 is mounted on the front face of the shield body 8, and a tail plate 2 (flexible) is mounted on the rear part of the shield body 8 via a universal connection mechanism 14.

FIG. 4 is an overall vertical sectional view of the shield excavator 1, in which the cutter disk 5 is connected to a hydraulic motor 16 via a reducer 15.
is driven by. This reducer 15 consists of a small gear 17 and a large gear 19 fixed to a cutter disk shaft 18, and these are integrally housed in a reducer case 20. Incidentally, as shown in FIG. 5, an appropriate number of hydraulic motors 16 (8 shown in the figure) for driving the small gear 17 are arranged around the circumference at the rear of the reducer case 20.

This reducer case 20 includes a thrust bearing 21 and a radial bearing 22 provided at both ends of the cutter disk shaft 18.
．． The cutter disk shaft 18 is rotatably supported via 28.

On the other hand, a spherical liner 24 is fixed to the outer periphery of the reducer case 20, and an annular spherical bearing 26 fixed to the shield body 8 via a pedestal 25 causes the reducer case 20 to
is supported by the shield body 3 and zero.

Further, at the rear of the reducer case 20, as shown in FIG.
A tilting hydraulic jack 27 is installed. By varying the amount of extension of each of these hydraulic jacks 27, the reduction gear case 20 can be connected to the spherical bearing 26.
It is tilted at the top.

Note that the cutter disk 5 integrated with the reducer case 2o is
The outer periphery of the rear portion is formed into a conical shape to prevent interference with the shield main body 8 when tilting.

A cutter chamber 28 is formed between the cutter disk 5 and the reducer case 2o, and a mud feed pipe 2 that supplies mud water.
9 and a mud drain pipe 8° for discharging excavated soil and muddy water are installed so as to penetrate through the reducer case 2o.

Note that the shield excavator 1 is not limited to the mud water pressurizing type, and a sealing material 81 is provided on the bearing portion of the cutter disk shaft 18 of the reducer case 2o, and a scraper seal 32 is provided on the spherical bearing 26.
is interposed to prevent foreign matter from entering.

On the pedestal 25 of the spherical bearing 26, there are installed an appropriate number of shield jacks 34 (16 in FIG. ) It is installed through the rear ring girder 85.

The universal connection mechanism 14 connects the shield body 8 and the tail plate 2, and its configuration is shown in FIG.
a) As shown in (b), it consists of a shield main body 8 and a tail plate 2, which have the same diameter at the connecting portion, and an inner ring 86 fitted into their inner surfaces.

At the outer 8 ends of the shield body 8 and tail plate 2,
A pair of pin seats 87 are provided on the upper and lower sides or on the left and right, respectively, protruding in the axial direction, and a pin 68 is bored in the pin seats 87.
8 includes bottles 8 installed above, below, left and right of the inner ring 86.
9 is inserted. In addition, the inner surfaces of the shield body 8 and the tail plate 2 and the outer surface of the inner ring 86 are provided with, for example,
A ring-shaped sealing material 4° is interposed to prevent muddy water and excavated soil from entering the shield excavator 1.

According to the Kono universal connection mechanism 14, the shield body 8 has an inner ring 86. As a result, the tail plate 2 is bent up and down with respect to the inner ring 86, so that the tail plate 2 can be bent in any direction with respect to the shield body 8. .

ft'! -3,5---) A bending control hydraulic cylinder 4 fixed to the shield body 8 and the tail plate 2 across the inner ring 36 in order to control the direction of the Li"j rate 2.
1 is attached in an appropriate number (four in FIG. 6(a)).

Next, the operation of the shield tunneling machine 1 will be explained based on the configuration described above.

During straight excavation, the amount of extension of the tilting hydraulic jack 27 is the same, and the axis 20a of the reducer case 20 is aligned with the shield body 8.
It coincides with the axis 8a of. When the shield jack 34 presses the end of the constructed segment 83, a reaction force acts on the pedestal 25 of the spherical bearing 26 that supports the reducer case 20, and excavation thrust is applied to the cutter disk 5 via the reducer case 20. to occur.

Next, when performing curved excavation, the cutter disk 5 interposes the reducer case 20 with respect to the shield body 8, and the extension amount of each tilting hydraulic jack 27 is made different so that a desired tilting angle is obtained.

For example, when tilting up and down, if the extension amounts of the upper and lower hydraulic jacks 27 are different, the reducer case 20 will tilt in the direction of the arrow 42 along the sliding surface of the spherical bearing 26 ( (See Figure 4).

On the other hand, when tilting left and right, the right and left tilting hydraulic jacks 27 may be operated in the same way.

When operated in this manner, the cutter disk 5 is tilted in any direction via the axis 20a of the reducer case 20.

Note that the rear end of the outer periphery of the cutter disk 5 is shaped so as not to interfere with the shield and the main body 8, so that the tilting movement of the cutter disk 5 is not inhibited by the shield main body 3.

In this way, the axis 20a of the reducer case 20 forms a certain angle with the axis 8a of the shield body 8, and as a result,
The central portion 5b of the tip of the cutter disk 5 is aligned with the desired curved axis 18.
It is possible to excavate the ground in a desired direction.

When moving the shield excavator 1 in a curved tunnel, the bending control hydraulic jack 41 is operated in the same manner as the tilting hydraulic jack 27, and the universal connection mechanism 14 connects the tail plate 2. is bent relative to the shield body 8.

Therefore, the shield tunneling machine 1 is bent at two nodes due to the tilting of the canopy disc 5 and the bending of the tail plate 2, so that it can easily move through the tunnel.

In addition, when the shield tunneling machine 1 is long and long, the shield main body 8 itself may be provided with a bent part, so that the entire shield body 8 may have an eight-bar structure.

In addition, it goes without saying that a copy cutter 48 for extra digging, which is conventionally often attached, may be attached to the cutter disk 5, and a resistance plate 44 for assisting the shield body 8 to assist in bending.

Although the explanation has been given above using a mud water pressurizing type shield excavator as an example, the present invention can be applied to any shield excavator having a cutter disk.

As described in detail above, the present invention enables tilting of the cutter disk by supporting the reducer case with a spherical bearing, and furthermore, the tail plate is attached to the shield body, and the unibody is attached to the joint connection mechanism. Since the shield tunneling machine is connected through -, the shield tunneling machine can bend at least two sections and can move smoothly in a curved tunnel. In addition, since the central portion of the tip of the cutter disk can be tilted in a desired curved excavation direction, it is possible to perform curved excavation with an extremely small radius of curvature.

[Brief explanation of the drawing]

Figure 1 is a plan view of a conventional folding type shield excavator, Figure 2
Figures (a) and (b) are diagrams of the conventional canter disk drive mechanism.
FIG. 8 is a plan view of the shield tunneling machine of the present invention, FIG. 4 is a vertical sectional view showing the internal structure, FIG. 5 is a sectional view taken along the line T in FIG. 4, and FIG. ■-Shao cotton line cross-sectional diagram Figure 6 (b
) is a perspective view taken from the 11th line in Figure (a). 1... Shield tunneling machine, 2... Tail plate, 3
...Shield body, 5...Cutter disk, 141
1. Universal connection mechanism, 15...Reducer, 2o.
... Reduction gear case, 25 ... Pedestal, 26 ... Spherical bearing, 27 ... Hydraulic jack for tilting, 32 ... Scraper seal 34 River shield jack, 40 ... Shini 2 material substitute Person Patent attorney Katsutoshi Yoshimura (and 1 other person) Figure 5 Figure 6 (a)

Claims (3)

[Claims] (1) A reducer case that houses the reducer that drives the cutter disk, and the reducer case that is installed in a pedestal fixed to the inner wall of the shield body to support the outer periphery of the reducer case. An annular spherical bearing that enables tilting, a tilting hydraulic jack attached to the back of the reducer case and the shield body to tilt the reducer case, and an excavation thrust applied to the base of the annular spherical bearing. The shield body has a shield jack that acts on the shield body, and a tellurium plate is connected to the shield body in a flexible manner at the rear of the shield body, and the cutter disk and tail plate are tiltable and bendable with respect to the shield body. Characteristic shield tunneling machine. (2) The shield excavator according to claim 1, wherein a scraper seal is interposed in the annular spherical bearing. (3) The shield according to claim 1 or 2, wherein the tail plate is bendably connected to the shield main body by a universal connection mechanism with an annular sealing material interposed therebetween. excavator.