JP2545285B2 - Shield machine - Google Patents

Description

The present invention relates to a shield machine having a cutter head repair and inspection mechanism.

<Prior Art> In recent years, the demand for shield machines has been shifting to large depths and large diameters.

When constructing a large depth shield tunnel, it is inevitable that long-distance excavation and underground connection will be required without increasing the number of shafts economically.

The biggest problem in long-distance excavation is wear of the bit, and how to replace it is a problem.

Fortunately, in large-diameter shield machines, the face plate thickness became thicker (for example, the space width inside the cutter head could be 80 cm or more), so a method to replace the bit from inside the cutter began to be proposed.

A conventional technique relating to a method of exchanging a bit from inside the cutter is shown in FIGS.

The cutter head a has a working space formed therein, and uses a center shaft b and an intermediate beam c as a passage to reach the cutter head a.

That is, inside the setter shaft b and the intermediate beam c,
A passage through which a worker can pass is provided, and the worker reaches the working space of the cutter head a through this passage to perform repair and inspection such as replacement work of the bit d.

<Problems to be Solved by the Present Invention> In the case of the above-mentioned conventional technique, it is necessary to manufacture the center shaft b and the intermediate beam c to have a diameter through which an operator can pass through.

However, since the center shaft b and the intermediate beam c are members that transmit rotation to the cutter head a and also rotate themselves, an increase in diameter leads to an increase in rotational power consumption and the cutter. It becomes an obstacle in the chamber and in the case of a mud pressure shield, it becomes a factor that obstructs the fluidity of the sediment.

Even in the case of a muddy water shield, clogging is liable to occur with soil that has a strong adhesive force.

Further, as a matter of course, the driving device for rotating the center shaft b and the intermediate beam c, the indicating device, or the like becomes large in size, which is uneconomical in view of manufacturing cost.

Further, since the center shaft b and the intermediate beam c need to be located near the central portion of the shield cross section, it may hinder the installation of other equipment.

<Object of the Present Invention> The present invention has been made to solve the above problems, and an object of the present invention is to provide a shield machine having a repair and inspection mechanism having a compact structure and a low manufacturing cost. To do.

<Structure of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

<A> Overall structure (Fig. 1) The present invention is a shield machine to repair a cutter head,
Since it has an inspection mechanism, it can be applied to various shield machines.

However, it is limited to a shield machine having a large diameter such that an operator can enter inside and work, such as a cutter head having a large thickness and a spoke having a large diameter.

In this embodiment, as an example thereof, the shield machine 1 shown in FIG. 1 will be described.

The shield machine 1 is provided with a cutter head 12 at one end of a skin plate 11 and a partition wall 13 inside thereof.

The cutter head 12 has a partition wall 13 via an intermediate beam 14.
It is configured to be rotatable by being connected to a driving device 15 fixed to the above.

Also, on the outer surface of the cutter head 12, a plurality of bits 16
Is attached.

A tubular body supporting portion 17 is provided near the peripheral portion of the partition wall 13, and a sealing material 18 is laid on the inner peripheral surface of the tubular body supporting portion 17.

Then, on the inner peripheral surface of the tubular body supporting portion 17, the hollow tubular body 2 having an axis parallel to the axis of the shield machine 1 is brought into close contact with the sealing material 18 and slidably fitted therein.

As a sliding device for the hollow tube body 2, a push jack 3 or the like connected to the tail end of the hollow tube body 2 is adopted.

On the other hand, an entrance / exit 4 for an operator to enter / exit the cutter head 12 is provided at a joint portion of the inner surface of the cutter head 12 with the hollow tube body 2.

 The main part will be described below.

<B> Cutter Head (Figs. 2 and 3) The cutter head 12 has a thickness that allows an operator to enter and work therein, and a working space 19 is provided therein.

In addition, as shown in FIG. 3, an entrance / exit 4 is opened at the joint between the inner surface of the cutter head 12 and the hollow tube 2.

A crimp ring 41 made of hard rubber or the like is attached to the outer peripheral portion of the inlet / outlet 4 on the hollow tube 2 side.

A lid 42 having a water blocking structure for opening and closing the entrance 4 is detachably attached.

Further, as shown in FIG. 2, an arcuate contact portion 43 having a size shorter than a semicircle is attached to a part of the outer periphery of the crimp ring 41.

The abutting portion 43 is attached at a position where the end of the hollow tubular body 2 abuts the inner peripheral surface of the abutting portion 43 when the hollow tubular body 2 is extruded toward the inner surface of the rotating cutter head 12. Make sure to attach it.

<C> Hollow tubular body (FIGS. 2 and 3) The hollow tubular body 2 is a tubular body such as a tubular body, and as shown in FIG. 3, an extent to which an operator can crawl inside (for example, A passage 21 having an inner diameter of about 80 cm) is provided.

The crimp ring attached to the cutter head 12
The diameter of 41 is set to a size with which the end of the hollow tube body 2 can abut,
The doorway 4 will be opened inside.

In addition, the end of the hollow tube body 2 on the cutter head 12 side is formed to have a slightly thin tube body to form an abutting portion 22, and at the time of joining, it is configured to bite into the crimp ring 41 to enhance water blocking performance. Good.

A lid 42 having a water blocking structure for opening and closing the passage 21 is detachably attached to the inside of the contact portion 22.

Then, at the end of the hollow tubular body 2 on the side opposite to the contact portion 22,
One or a plurality of push-out jacks 3 are connected so that the hollow tube body 2 can be pushed out toward the cutter head 12 side.

<Operation of the Present Invention> Next, the operation of the present invention will be described according to the order of construction.

While the shield machine 1 is excavating, the rod of the pushing jack 3 is contracted to store the hollow tube body 2 in the skin plate 11.

 Therefore, there is no hindrance when digging.

When performing repair work such as replacement of the bit 16 or inspection work, the rotation of the cutter head 12 is stopped at a predetermined position.

Next, the pushing jack 3 is extended to push the hollow tube body 2 to the front side of the inner surface of the cutter head 12.

The cutter head 12 is finely rotated to bring the contact portion 43 into contact with the contact portion 22 of the hollow tube body 2.

Then, the hollow tube body 2 is pushed out again by the push-out jack 3 and the abutting portion 22 is pushed against the crimp ring 41, thereby joining and stopping water.

In this way, by providing the contact portion 43, the cutter head 12 and the hollow tube body 2 can be easily and reliably joined together.

The lid 23 of the hollow tube 2 and the lid 42 of the entrance / exit 4 are removed, and the working space 19 of the cutter head 12 and the passage 21 of the hollow tube 2 are communicated with each other.

This allows the worker to reach the work space 19 through the passage 21 and perform the required work.

In this embodiment, the cutter head 12 and the hollow tube body 2 are
Although the joining method with is performed by pressing the contact portion 22 against the crimp ring 41, a joining method such as a quick joint (one-touch coupler) or screwing may be considered.

When starting the excavation again, the above procedure may be reversed.

<Effects of the Present Invention> Since the present invention has been described above, the following effects can be expected.

<a> The conventional device has a rotating part such as a center shaft or an intermediate beam that passes through a communication passage through which a worker can pass, so it is necessary to manufacture the device with a diameter larger than necessary, which increases the rotational power consumption. Alternatively, it is uneconomical because the driving device for rotating them, the supporting device, or the like becomes large.

On the other hand, the device of the present invention does not allow the connecting passage to pass through the rotating portion such as the center shaft or the intermediate beam.

That is, the present invention is configured such that the hollow tubular body dedicated to the working passage is pushed out by the jack and can penetrate into the cutter head.

Therefore, it is sufficient to operate the jack only when repairing or inspecting the cutter head, and the power consumption thereof is extremely small compared with the conventional one, so that the power consumption can be reduced.

<B> Since the present invention does not penetrate the connecting passage through the rotating portion such as the center shaft and the intermediate beam, the driving device or the supporting device does not increase in size as in the conventional case, and the manufacturing cost is low. It is economical.

<C> Since the device of the present invention does not increase in size, it does not become an obstacle in the cutter chamber as in the conventional case.

Therefore, the mud pressure shield does not impede the fluidity of the earth and sand, and the mud shield does not cause the clogging by the earth and sand having a strong adhesive force.

<D> Since the center shaft and intermediate beam must be located near the center of the shield cross section, increasing their diameter may hinder the installation of other equipment, as in conventional devices. .

On the other hand, in the device of the present invention, a communication passage can be provided at one end near the peripheral edge of the cutter head.

Therefore, there is no risk of hindering the installation of other equipment.

[Brief description of drawings]

 FIG. 1 is an explanatory view of an apparatus according to an embodiment of the present invention. FIGS. 2 and 3 is an explanatory view of main parts. FIGS.

Claims (1)

(57) [Claims] 1. A shield machine for excavating the ground by providing a cutter at one end of a tubular skin plate, and a hollow cutter head having a working space inside, and a hollow cutter head capable of communicating with the working space of the cutter head. A shield machine having a hollow tubular body and a jack for extruding the hollow tubular body and joining one end of the hollow tubular body to a cutter head.