JPS6117109Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a shield excavator in which the cutter chamber has a closed structure with respect to the face except for the sludge conveyance passage, and is used to remove excavated earth and sand (hereinafter referred to as sludge) in the cutter chamber. ), or remove accumulated and consolidated debris, and the space inside the cutter chamber after removing the consolidated and accumulated soil can be kept to the minimum necessary, increasing the stability of the face. Regarding closed type shield tunneling machines.

[Conventional technology]

Generally, in a closed type shield excavator, as shown in Fig. 1, the cutter chamber 2 has a sealed structure with respect to the face except for the earth and sand conveying passage, and once the waste excavated by the cutter 1 is introduced into the cutter chamber 2, The introduced waste S is taken in by a screw conveyor 3 forming a dirt conveying passage and discharged to the rear of the cutter chamber.

[Problem that the invention attempts to solve]

For this reason, during shield excavation, the cutter chamber 2
Since shear S is constantly introduced into the cutter chamber 2, the shear may accumulate and solidify on the inner circumferential surface of the cutter chamber 2. When the shear S accumulates and solidifies on the inner circumferential surface of the cutter chamber 2 in this way, the shear introduction slit (not shown) of the cutter 1 is closed. Therefore, it becomes impossible to introduce a gap in the connection into the cutter chamber 2, and moreover, this prevents the cutter 1 from being introduced into the cutter chamber 2.
It often happens that the entire face is subjected to excessive pressure (earth pressure) from the ground side and cannot rotate. For this reason, it is necessary for the shield excavator to take measures to prevent solidification of sludge in the cutter chamber 2 or to remove solidified sludge. However, the reality is that no particularly effective means have been developed as a countermeasure.

Conventionally, for example, as shown by the dashed line in FIG. 1, a water jet pipe 4 is inserted into the cutter chamber 2 and high pressure water is jetted out from this pipe to clean the inside of the cutter chamber 2.
However, it is virtually impossible to prevent the solidification of the debris inside the cutter chamber or to reliably remove the solidified debris by such means. Furthermore, the above-mentioned conventional means require large-scale equipment, which is disadvantageous in terms of maintenance and cost.

Further, as a conventional example, there is a forced earth removal device for a tunnel excavator disclosed in Japanese Utility Model Publication No. 44-6221. This device is an open type in which the tunnel excavator drops the waste from the top of the cutter onto a conveyor in a chute and discharges it.

In addition, a scraper is installed inside the cutter bucket, but this scraper is installed on the cutter head, which is a rotating body, and the scraper is always activated as the cutter head rotates. It is not possible to arbitrarily adjust the amount of protrusion.

In the case of a closed-type shield tunneling machine, it is necessary to fill the cutter chamber with earth and sand to stabilize the face, and there was a problem in which the above-mentioned conventional example could not be adopted.

[Purpose of invention]

This idea was created in view of the above circumstances.

The purpose of this invention is to use a closed type shield excavator to remove soil that has consolidated and accumulated inside the cutter chamber by using the rotating force of the cutter to move the scraper only when the cutter load increases, thereby increasing the space in the cutter chamber. To provide a closed type shield excavator that can minimize the amount of stress and increase the stability of the face as much as possible.

[Summary of the idea]

In order to achieve the above purpose, a cutter chamber is formed on the back side of a cutter that is rotatably provided to cover the front end opening of the shield frame, and a cutter chamber is formed to take in the excavated soil. Insert the entrance side of the earth and sand transport passage that transports earth and sand to the rear of the shield frame, and provide a cover that covers the entrance side of the earth and sand transport passage in a substantially concentric shape through a hollow part, and cut out a part of the cover. In addition, a scraper is formed which pivots at one end and rotates outward in the radial direction, and a rotating means for the scraper is provided in the hollow portion.

〔Example〕

A preferred embodiment of this invention will be described below with reference to FIGS. 2 and 3. In the shield tunneling machine shown in these figures, 10 is a shield frame;
11 is a cutter frame, 12 is a shield jack, 1
3 is a katsuta. The cutter 13 has a cutter chamber 14 formed on its back side, is rotatably supported on the pedestal 11 via a cutter bearing 15, and is rotationally driven by a drive means (not shown). Into the cutter chamber 14 is inserted the entrance 17 side of a screw conveyor 16 that faces the center or axis of the chamber and forms a dirt conveying passage. That is, the cutter chamber 14 on the opposite side to the face side has an earth and sand transport passage attached to its axial core.
The insertion part of the conveyor that forms the earth and sand conveyance path,
The portion of the screw conveyor casing 16b forming the so-called inlet 17 is covered with a concentric cover 19 forming a hollow portion 18 between it and the outer peripheral surface as shown in FIG.

A cutter chamber 14 is provided at the bottom of the tip side of this cover 19.
A scraper 20 is provided inside the shaft so as to be freely retractable in the radial direction from the shaft core thereof.

This scraper 20 has an arm member 20a which is formed by cutting out a part of the cover 19 and supporting it via a pin 21 so as to be freely deployable radially outward.
and a drilling bit 20b provided on the outside of the tip of the arm member. Therefore,
The arm member 20a is connected to the notch 22 of the cover 19.
It becomes a cover that opens and closes.

The scraper 20 configured as described above is connected to a hydraulic jack 23 provided in the so-called hollow section 18 in the cover 19 on the back side of the tip side of the arm member 20a, which is a hydraulic jack 23 serving as a means for rotating the scraper. It is configured so that it is driven to protrude and retract, and the amount of protrusion radially outward can be adjusted as desired.

Next, the operation of the above embodiment will be explained. During the shield excavation work, waste excavated by the cutter 13 and introduced into the cutter chamber 14 is taken into the screw conveyor 16 from the entrance 17, and is conveyed rearward by the screw conveyor. Since sludge S is constantly introduced into the cutter chamber 14 during such shield excavation work, the sludge S accumulates in the cutter chamber 14, particularly in the large-diameter hollow chamber portion 14a. Then, the accumulated shear S may solidify. When the accumulated sludge S solidifies, as described in the conventional example, it becomes impossible to introduce the sludge into the cutter chamber 14, and the cutter load becomes excessive and the cutter 13 becomes unable to rotate. Therefore, in order to avoid such a situation, the third
The hydraulic jack 23 shown in the solid line in the figure is extended and operated. This moves the scraper 20 to the second position.
It is caused to protrude outward in the so-called radial direction from the closed position shown by the solid line in FIGS. Finally, the excavation bit 20b of the scraper 20
into the above-mentioned accumulated sludge S. If you perform shield excavation work in this state, the cutter 13
rotates and the accumulated shear S rotates with it, so that the accumulated shear S is scraped off or stirred by the scraper 20 on the stationary side. Therefore, not only the sludge that has solidified in the cutting chamber 14 is removed, but also the sludge that is about to solidify is prevented from caking, thereby avoiding the above-mentioned situation. Can be done.

Further, the scraper 20 is mounted on a hydraulic jack 2.
3, the amount of radial outward protrusion or extension from the axis inside the cutter chamber 14 can be adjusted as desired, and the amount of scraping off of consolidated deposits can be controlled. The space required after removing the consolidated and accumulated earth and sand can be minimized, and the stability of the face will not be affected.

Furthermore, only when solidified deposited shear occurs and the cutter load increases, the scraper 20 can be projected radially outward to scrape off or stir it, and the scraper 20 is normally inactive. It is something that can be maintained.

Note that the screw conveyor 16 may be any other type of conveyor, such as a belt conveyor, as long as it forms a dirt conveying path for taking in and conveying waste from the cutter chamber 14.

[Effect of idea]

In summary, the present invention exhibits the following excellent effects.

(1) Cover the entrance side of the earth and sand transport passage, which is the fixed side to the rotating cutter chamber, in a substantially concentric circle through a hollow part, cut out a part of this cover, and use one end as a fulcrum to cover the entrance side in the radial direction. Since the scraper is configured to rotate, and the scraper rotation means is provided in the hollow portion, when the scraper is not rotated radially outward, the scraper rotation means is hidden in the hollow portion and the scraper becomes a part of the cover. It does not impede the flow or discharge of sediment.

(2) In addition, since the scraper can be activated or deactivated independently of the rotation of the cutter chamber, it is possible to activate or deactivate the scraper when the cutter load increases, thereby reducing the amount of soil that has consolidated and accumulated in the cutter chamber. The scraper can be activated or deactivated as needed, and the space in the cutting chamber can be kept to the minimum necessary to increase the stability of the face as much as possible.

(3) It has a simple structure and is advantageous in terms of maintenance and cost.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a conventional shield tunneling machine, FIG. 2 is a cross-sectional view of a shield tunneling machine according to a preferred embodiment of this invention, and FIG.
FIG. 3 is a cross-sectional view taken along the line. In the figure, 13 is a cutter, 14 is a cutter chamber, 16 is a screw conveyor illustrated as an earth and sand conveying passage, 17 is an entrance, 18 is a hollow part, 19 is a cover,
20 is a scraper, and 23 is a hydraulic jack which is its rotation means.

Claims (1)

[Scope of utility model registration request] A cutter chamber is formed on the back side of a cutter rotatably provided at the front end opening of the shield frame to cover it, and a cutter chamber is formed to take in the excavated earth and sand, and the excavated earth and sand is transported to the rear of the shield frame at the shaft core inside the cutter chamber. A cover is provided which covers the entrance side of the earth and sand transport passage in a substantially concentric shape through a hollow part, and a part of the cover is cut out and one end is pivoted to form a radius 1. A closed type shield excavator, characterized in that a scraper is formed that rotates outward in a direction, and a means for rotating the scraper is provided in the hollow portion.