JP2563974Y2 - Agitator device for tunnel machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agitator device for a tunnel machine which prevents a drain pipe from being blocked by earth and sand.

[0002]

2. Description of the Related Art Conventionally, a tunnel excavator in which mud water is poured into earth and sand excavated by a cutter head and taken into a chamber to slurry the earth and sand and discharge the earth and sand by a mud pipe is excavated. It is often the case that the entrance of the drainage pipe is blocked by earth and sand due to the soil quality of the face, making it difficult to discharge the sludge. For this reason, conventionally, when it becomes difficult to discharge the sediment due to the obstruction of the mud pipe, muddy water is sent to the mud pipe to reverse the sediment in the mud pipe, or the area near the mud pipe inlet is probed with a rod or the like to close the mud pipe. The mud pipe is prevented from being clogged by removing the sediment or by installing a separate agitator near the entrance of the mud pipe and stirring the mud well.

[0003]

However, in the method in which muddy water is injected into the drainage pipe to reverse the closed sediment, excavation must be interrupted during that time, which lowers the excavation efficiency and reduces the entrance of the drainage pipe. In the method of searching the vicinity with a rod or the like, it is necessary to stop the injection of muddy water into the chamber,
The work is dangerous because there is a risk that the face and the earth pressure balance in the chamber may be lost and the face may collapse, and the method of installing an agitator near the entrance of the mud pipe is a small diameter with no space for installing the agitator. There were problems such as not being applicable to tunnel excavators. The present invention has been made to solve the above-mentioned conventional problems, and has as its object to provide an agitator device for a tunnel machine that can be easily installed in a small space.

[0004]

According to the present invention, in order to achieve the above object, earth and sand excavated by a cutter head provided at a front portion of a shield body and taken into a chamber are injected from a mud pipe. A tunnel excavator that is slurried by the muddy water and discharged by a drain pipe, wherein an outer pipe having an inlet opening the drain pipe in a chamber;
The inner pipe is slidable back and forth by a gap adjusting cylinder with respect to the outer pipe, and the tip of a screw provided in the above-mentioned exhaust pipe projects from the inlet of the outer pipe into the chamber, and sediment is applied to the tip. It is equipped with stirring blades.

[0005]

According to the above construction, the sediment well stirred by the blades is taken into the drainage pipe, so that the drainage pipe is not blocked by the soil and the gap between the blade and the partition is adjusted by the gap adjusting cylinder. Thereby, the size of the gravel taken into the sludge pipe can also be limited.

[0006]

An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a tunnel machine, FIG. 2 is a vertical cross-sectional view thereof, and FIG. 3 is a front view showing a blade shape of an agitator device.
In these figures, reference numeral 1 denotes a shield body propelled into the ground by a shield jack (not shown). The shield body 1 is composed of a front shield 1a and a rear shield 1b. The shields 1a and 1b are freely bendable by an articulating jack 2 and are not shown at the front end of the front shield 1a. A cutter head 3 rotated by a cutter head motor is provided. A large number of disk cutters 3a are rotatably mounted on the front surface of the cutter head 3, and the earth and sand excavated by these disk cutters 3a are taken into a chamber 1d which is kept airtight by a partition wall 1c. ing.

Muddy water is injected into the chamber 1d by a mud pipe 4 so that the pressure in the chamber 1d is balanced with the pressure of the face.
The earth and sand taken in is stirred with the mud water injected with the rotation of the cutter head 3 to be turned into a slurry, and is discharged from the drain pipe 5. The exhaust pipe 5 is installed substantially horizontally below the center of the shield main body 1 and has a double structure of an outer pipe 5a and an inner pipe 5b on the tip side. The front end of the outer tube 5a penetrates the partition wall 1c and opens into the chamber 1d, and a seal 6 is interposed between the rear end of the outer tube 5a and the front end of the inner tube 5b.

On the other hand, a screw 5c is accommodated in the inner pipe 5b of the above-mentioned drainage pipe 5. The tip of the screw 5c protrudes into the chamber 1d through the outer tube 5a, and the agitator 7 is attached to the tip. The agitator 7 is composed of a plurality of blades 7a having a substantially Y-shape. Each of the blades 7a is attached to the tip of the screw 5c with a phase shift as shown in FIG. The earth and sand near the entrance 5d of the sludge pipe 5 is screwed into the screw 5c.
Stir with the rotation of.

The rear end of the screw 5c has an outer peripheral portion fixed to the inner peripheral surface of the driving cylinder 8a of the driving mechanism 8. The drive mechanism 8 has a gear case 8b provided on an outer peripheral portion of a drive cylinder 8a, and a drive motor 8c is mounted on the gear case 8b. The drive motor 8c includes a pinion 8d provided in a gear case 8b and a drive cylinder 8a.
The driving cylinder 8a is rotated via a gear 8e provided on the outer peripheral surface of the driving cylinder 8a, whereby the screw 5c connected to the driving cylinder 8a can rotate. Further, a pair of gap adjusting cylinders 10 are provided between both ends of the gear case 8b and the partition wall 1c as shown in FIG. The gap 9 between the blade 7a on the rear side of the agitator device 7 and the partition wall 1c can limit the size of the gravel taken into the inlet 5d of the mud pipe 5 by sliding the agitator device.

Next, the operation will be described. The earth and sand excavated by the cutter head 3 and taken into the chamber 1d are slurried by the muddy water injected from the mud pipe 4 and collected from the inlet 5d of the mud pipe 5. The agitator 7 is provided at the inlet 5d of the exhaust pipe 5, and the blades 7a are rotated with the rotation of the screw 5c to agitate the sediment taken in from the inlet 5d. As a result, the muddy water and well-mixed earth and sand are taken into the mud drain pipe 5, so that the sediment is not blocked in the mud drain pipe 5. The gap adjusting cylinder 10
By moving the inner pipe 5b back and forth to adjust the gap 9 between the blade 7a and the partition wall 1c, the size of the gravel taken into the mud pipe 5 can be limited. Blockage or the like caused by being taken into the device can also be prevented.

[0011]

[Effects of the Invention] As described in detail above, the present invention attaches a blade of an agitator to the tip of a screw provided in a drain pipe so that the sediment taken in from the inlet of the drain pipe is well stirred. Therefore, it is possible to prevent the earth and sand from being clogged in the drainage pipe and making excavation difficult. In addition, since the size of gravel taken into the mud pipe can be limited, large gravel is not trapped in the mud pipe and may cause blockage of the mud pipe. Since the blades of the agitator device are used to rotate the agitator device, there is no need to separately install the agitator device as in the related art. This eliminates the need for a space for installing the agitator device, so that the present invention can be easily applied to a small-diameter tunnel machine.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a tunnel machine according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a tunnel machine according to an embodiment of the present invention.

FIG. 3 is an enlarged front view of the agitator device according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield main body 1d Chamber 3 Cutter head 4 Mud feed pipe 5 Drain pipe 5a Outer pipe 5b Inner pipe 5c Screw 5d Inlet 7a Blade 10 Gap adjusting cylinder

Claims (1)

(57) [Scope of request for utility model registration] An earth and sand excavated by a cutter head 3 provided in a front part of a shield body 1 and taken into a chamber 1 d is slurried by mud water injected from a mud pipe 4 and is discharged by a mud pipe 5. In the tunnel machine which discharges, an outer pipe 5a having an inlet 5d for opening the above-mentioned mud pipe 5 into the chamber 1d, and an inner pipe slidable back and forth with respect to the outer pipe 5a by a gap adjusting cylinder 10. 5b and a screw 5 provided in the exhaust pipe 5
An agitator device of a tunnel excavator having a tip of c projecting from the inlet 5d of the outer tube 5a into the chamber 1d and a blade 7a for stirring earth and sand attached to the tip.