JPS6335118Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a shield tunneling machine for appropriately providing a widening section in the middle of a tunnel.

[Prior art and its problems]

When high-voltage electric wires are installed, the joint part of the cable has a larger cross section than other parts, so the part where the joint parts are concentrated needs to be formed as a widened part in order to secure space.

One method of constructing such widening sections is to construct a shaft from the ground, but this is often limited by road conditions and the work environment, and is time-consuming because the shaft must be filled in at the end. It takes a lot of money.

Therefore, the method of constructing a tunnel using the shield method and constructing the widening section while taking advantage of the advantages of this construction method is being considered, but the problem is how to use earth retaining etc. in order to remove the assembled segments and excavate the widening. Therefore, if you try to use a large-diameter shield tunneling machine, there are limitations in terms of the delivery method.

[Purpose of invention]

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide a shield excavator for widening with a simple structure that can perform not only normal diameter excavation but also widening excavation all at once, and that can reliably obtain supporting force during widening excavation and perform stable work. It's about doing.

[Key points of the idea]

However, according to the present invention, the purpose of the lever is to form the tail part into a rotating structure, provide an over cutter which can be circumferentially circumferentially pushed out using hydraulic pressure, and excavate the widened part with the over cutter. Supporting capacity is achieved by obtaining frictional resistance from the surrounding ground of the excavator body.

[Example of idea]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a front view showing an embodiment of the shield tunneling machine of the present invention, and Fig. 2 is a side view of the same. ,
Reference numeral 3 indicates the excavator body, which is a non-rotating part to which the cutter head 1 is attached, and 3a indicates its tail.

This embodiment is a so-called mechanical shield, and as is well known, the cutter head 1 and the cutter bit 2 are rotated by a drive device such as a motor installed in the excavator body 3 using a shaft or drum structure, and the earth and sand cut by the cutter bit 2 is It has a structure that is taken into the body part 3 through an appropriate slit.

The tail portion 3a of the body portion 3 is partially divided to form a rotating structure, and an over cutter 4 that can be pushed out to the outer periphery by hydraulic pressure is provided there.

A drum type is suitable for the rotating structure of the tail portion 3a, and as an example, as shown in FIG. Make it concatenated.

In addition, the hydraulic jack 7 is equipped with a push rod 8 and a cutter rod 9 that changes the direction of movement by about 90 degrees.
The over cutter 4 is attached to the tip of the cutter rod 9.

Furthermore, although detailed structure description will be omitted, the rearmost tail and skin plate 10 are formed by an assembly of split pieces, and can be expanded into an umbrella shape with jacks, etc., and overcuts are installed at appropriate locations. A window hole with an opening/closing door will be provided to take in the soil excavated in step 4. In the figure, 11 and 11' indicate seals.

Next, the usage and function will be explained. To excavate a normal diameter, the over cutter 4 as shown in FIG. Excavating with only the cutter head 1 at the tip and moving forward with a shield jack (not shown). Segments 12 are assembled at the rear.

In this manner, when the area to be widened is reached, the over cutter 4 is projected toward the outer circumference, and when the rotary drum 5 is rotated, the cutter 4 also rotates to excavate the surrounding area, thereby expanding the diameter.

At that time, the earth and sand are taken into the body part 3 through the window hole, but since the majority of the body part 3 in front of the rotating drum 5 is in close contact with the surrounding ground, this part provides supporting force and the widening excavation is carried out. can be done reliably.
Further, in a place where the cutter head 1 and the over cutter 4 are driven at the same time, further stability can be obtained by making them rotate in opposite directions.

A large diameter segment 13 is assembled behind the widened excavation part, and the tail and skin plate 10 are opened to seal the tail part 3a and the space therebetween.

[Effect of idea]

As mentioned above, the widening shield excavator of the present invention can excavate the widening section at the same time as excavating the normal diameter, saving time and effort, and increasing the supporting capacity without installing a complicated mechanism. It is a simple device that allows you to work in a stable condition.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the shield excavator for width expansion of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a vertical side view of the main part, and Figs. 4 and 5 are respectively in use. FIG. 1... cutter head, 2... cutter bit, 3... excavator body, 3a... tail part, 4
...Over cutter, 5...Rotating drum, 6...
...Thrust roller or thrust bearing, 7...
...Hydraulic jack, 8...Push rod, 9...
Cutter rod, 10... tail, skin plate, 11, 11'... seal, 12, 13... segment.

Claims (1)

[Scope of utility model registration request] A shield excavator for width widening, characterized in that the tail part is formed into a rotating structure, and an over cutter that can be pushed out to the outer periphery by hydraulic pressure is provided therein.