JPS6124634Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a shield excavator, and more particularly, to an improvement of a muddy shield excavator.

As shown in FIGS. 1 and 2, in the conventional mud water type shield excavator, a mud feeding pipe 3 and a mud removal pipe 4 are introduced into a cutter chamber 2 through a bulkhead 1. An agitator 6 is rotatably provided in front of the suction port 5 of the pipe 4, and when excavating soil that tends to produce clods (hard clay, etc.) or a gravel layer, the agitator 6 is rotated to remove clods and gravel. It was designed to prevent the mud pipe 4 from clogging.
In the figure, 7 is a shield body, and 8 is a chute.

However, in such a conventional shield excavator, since the agitator 6 simply stirs the earth and sand in front of the mud removal pipe 4, it is only able to momentarily remove large clods or debris that may clog the pipe. As the excavation progresses, clods of earth accumulate, leading to pipe blockages, and when pipe blockages occur, it takes time and effort to remove them, reducing excavation efficiency. .

The present invention was developed in view of the above-mentioned circumstances.In a muddy water type shield excavator in which a mud feeding pipe and a mud removal pipe are introduced into the cutter chamber by penetrating the bulkhead at the rear of the cutter, a screw conveyor is installed inside the shield body. is arranged so that the tip of the conveyor is located close to the suction port of the sludge pipe so that the flight of the tip of the conveyor crosses within the cross section of the sludge pipe, and at the dirt discharge port of the conveyor, A classification device equipped with a screen that can separate soil clods, gravel, etc. is connected,
This invention relates to a shield excavator characterized in that another sludge removal pipe is connected to a predetermined position of the classification device.

Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 3 and 4, a mud feeding pipe 3 is installed at the upper part of the cutter chamber 2 through the bulk head 1 located at the rear of the cutter 9, and a mud removal pipe 4 is installed at the lower part of the cutter chamber 2.
In the muddy water shield excavation machine that introduced each
A screw conveyor 10 for transporting earth and sand is disposed within the shield body 7, and the tip of the screw conveyor 10 is passed through the bulk head 1 and placed above the suction port 5 of the mud removal pipe 4 within the cutter chamber 2. The screw conveyor 10 is configured so that the tip flight 11 of the screw conveyor 10 crosses within the cross section of the mud removal pipe 4.

Further, at the rear of the screw conveyor 10, there is provided an earth and sand discharge port 14 which is opened and closed by the movement of the conveyor gate 13 connected to the cylinder 12, and a suitable mesh screen is installed in the discharge port 14 to partition the interior into upper and lower parts. 15 and a sieve, etc., a hatch 17 is provided at the upper part of the classifier 16, and a sludge drainage pipe 18 is connected to the lower part.

In the figure, 19 is a conveyor motor, and 20 is a cutter motor. In FIGS. 3 and 4, the same reference numerals as in FIGS. 1 and 2 indicate the same parts.

In such a configuration, if the ground in front of cutter 9 is normal soil, rather than soil that tends to form clods or a large gravel layer, flight 1 of the screw conveyor
1 is reversed, and the mud draining pipe 4 is used to discharge the earth and sand. In this way, since the flight 14 is located close to the suction port 5 of the mud removal pipe 4 and crosses the cross section of the mud removal pipe 4, the flight 14 can be sufficiently removed from the dirt taken into the cutter chamber 2. A stirring effect can be provided, and the stirred earth and sand can be smoothly discharged from the mud removal pipe 4, thereby preventing pipe clogging.

On the other hand, if the ground in front of the cutter 9 is of a soil type that tends to form clods or is a large gravel layer, the suction of the mud removal pipe 4 is stopped and the flights 11 of the screw conveyor 10 are rotated in the normal direction. The earth and sand are forcibly discharged by the screw conveyor 10. That is,
The earth and sand at this time is conveyed from the suction port 5 of the screw conveyor 10 to the discharge port 14, and from there is sent into the classification device 16 by opening the conveyor gate 10 by the operation of the cylinder 12. Inside the classification device 16 is a screen 15 that partitions the interior into upper and lower parts.
Since the screen 15 is provided with a screen 15, clods of earth, gravel, etc. that cannot be removed remain on the screen 15, and other earth and sand pass through the screen 15 and fall to the lower part of the classification device 16. The earth and sand that has fallen to the bottom of the classification device 16 is sucked in and discharged from the mud removal pipe 18, while the clods and gravel that remain in the top of the classification device 16 are removed at an appropriate time with the conveyor gate 13 closed. remove.

As described above, by selectively using the rotation of the screw conveyor 10 and the suction of the mud removal pipe 3 depending on the soil quality in front of the cutter 9, clogging of the mud removal pipe 4 can be prevented.

In addition, the front flight 1 of the screw conveyor 10
1 may be provided with a notch 11' as shown in FIG. 5 to make the flight 11 uneven to easily generate turbulent flow in the earth and sand to further improve the stirring effect. Of course, various changes may be made without departing from the gist.

As mentioned above, according to the present invention, the tip flight of the screw conveyor is brought close to the suction port of the sludge removal pipe so that it crosses within the cross section of the sludge removal pipe, and the sludge removal route can be changed depending on the soil condition. (i) In the case of normal earth and sand, the reversing action of the tip flight can reliably stir the earth and sand at the suction port of the mud removal pipe, thereby preventing clogging of the mud removal pipe.

(ii) In the case of soil that tends to cause pipe clogging, such as clods of earth or cobbles, the conveyor can forcibly carry the soil to the classification device, where it can classify and discharge the clods of soil, cobbles, etc. that cause clogging of the pipes. There is no risk of blockage.

(iii) Operation is easy because changing the sludge removal route can be done by changing the direction of rotation of the screw conveyor.

(iv) From the above, excavation efficiency can be improved.

Demonstrates excellent effects such as

[Brief explanation of the drawing]

Figure 1 is a cutaway side view of a conventional shield tunneling machine.
Fig. 2 is a view in the direction of Fig. 1, Fig. 3 is a cutaway side view of the shield tunneling machine of the present invention, Fig. 4 is a view in the direction of Fig. 3, and Fig. 5 is a view of the screw conveyor and other parts. FIG. 1...bulk head, 2...katsutachiyamba,
3...Sludge feeding pipe, 4...Sludge removal pipe, 5...Suction port, 7
...Shield body, 9...Katsuta, 10...Screw conveyor, 11...Flight, 15...Screen, 16...Classifier, 17...Hatch,
18...Sludge drainage pipe.

Claims (1)

[Scope of utility model registration request] In a mud water type shield excavator in which a sludge conveying pipe and a sludge removal pipe are introduced into the cutter chamber by penetrating the bulkhead at the rear of the cutter, a screw conveyor is arranged inside the shield body and the tip of the conveyor is connected to the cutter chamber. The conveyor is positioned close to the suction port of the sludge pipe so that the flight at the tip of the conveyor crosses within the cross section of the sludge pipe, and the soil discharge port of the conveyor is equipped with a screen, etc. that can separate clods, gravel, etc. A shield excavator characterized in that a sludge removal pipe is connected to a sludge classification device, and another sludge removal pipe is connected to a required position of the sludge classification device.