JPH0354240Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a shield tunneling machine for excavating small diameter tunnels.

BACKGROUND TECHNOLOGY Typically, shield tunneling machines for small diameter tunnels use fluid transport using muddy water to discharge excavated earth and sand. By the way, if the soil contains coarse solids such as coarse gravel or bedrock,
It is necessary to crush coarse solids to enable fluid transport (slurry transport). As such a shield tunneling machine, there is one shown in Japanese Utility Model Application Publication No. 162196/1983. In this machine, a geocrusher is placed between a screw conveyor that discharges excavated earth and sand outside the machine and a fluid transport pipe, and the coarse solids mixed in the earth and sand from the screw conveyor are removed by the geocrushier. After crushing, fluid is transported.

Problems to be Solved by the Invention According to the above-mentioned conventional configuration, since coarse solids are crushed using a geo crusher, crushing is only performed intermittently, which has the problem of limited processing capacity. York crushing is compression crushing, and since rocks are resistant to compression, there was a problem in that it required a large amount of force.

Therefore, an object of the present invention is to provide a shield tunneling machine that can solve the above problems.

Means for Solving the Problem In order to solve the above problem, the shield excavator of the present invention has a screw conveyor-type earth removal device that discharges earth and sand from the earth and sand intake chamber formed in the cutter head, and the rear end of the cylindrical casing is discharged. The small-diameter opening side of a conical casing is connected to the outlet part, and a conical body is provided inside the casing so as to be rotatable at a position eccentric to the center line of the casing. is configured to be larger than the inner surface inclination angle with respect to the center line of the casing,
Connect the fluid discharge pipe to the rear end of the above casing,
A rotary drive device for rotating the cone is also provided.

Function In the above configuration, the earth and sand excavated by the rotation of the cutter head enters the earth and sand intake chamber, where it is turned into slurry. This slurry of earth and sand is transported backward inside the cylindrical casing by ribbon-shaped screw blades and enters the annular space between the casing and the cone, where the coarse solids contained in the earth and sand are removed from the casing. It is ground by a cone that rotates eccentrically relative to the fluid and is continuously discharged via a fluid discharge pipe.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Reference numeral 1 designates a shield excavator for excavating small-diameter tunnels, which includes a shield body 2 divided into front and rear bodies 2A and 2B and connected to each other via a direction correction jack 3, and a swing bearing 4 at the front end of the shield body 2. a cutter head 6 which is rotatably supported through the cutter head 6 and has a dirt intake chamber 5 formed therein;
It is comprised of an earth removal device 7 that discharges the earth and sand in the earth and sand intake chamber 5 to the outside of the machine by chiller transport. 8 is an electric motor for driving the cutter head 6, and a pinion 9 attached to its output shaft 8a is meshed with a ring gear 10 attached to the rear cylindrical portion 6a of the cutter head 6. The earth removal device 7 includes a rear partition wall 11 whose front end opening forms the earth and sand intake chamber 5.
A cylindrical casing 1 is inserted through the cylindrical casing 1 to open into the earth and sand intake chamber 5, and has a discharge port 12a formed at the rear end.
2, a ribbon-shaped screw blade 13 rotatably disposed within the cylindrical casing 12, and a conical casing 1 whose small diameter opening end is connected to the rear end flange portion 12b of the cylindrical casing 12.
4, a lid body 15 attached to the large-diameter opening end of the casing 14, and a lid body 15 that is disposed inside the casing 14 and is rotatable through a bearing 16 within the center hole 15a of the lid body 15. a conical body 17 supported by the casing 14 and the conical body 1;
7 protruding bands 18 and 19 having a triangular cross section and spirally wound around the outer surface, and a ribbon-shaped screw blade 13 attached to the lid 15 and connected to the conical body 17 and the front end of the conical body 17. It is composed of an electric motor 20 that rotates the motor. The centerline a of the casing 14, the rotational axis b of the ribbon-shaped screw blade 13, and the rotational axis c of the conical body 17 are all aligned, but the centerline d of the conical inclined surface of the conical body 17 is The outer surface 1 is eccentric with respect to the center line a of the casing 14 by a predetermined distance e, and is further eccentric with respect to the center line d of the cone 17.
The inclination angle 7a is configured to be larger than the inclination angle of the inner surface 14a with respect to the centerline a of the casing 14. Therefore, the annular space 21 formed between the casing 14 and the conical body 17 is wide on the entrance side;
It gets narrower as you go towards the exit. Furthermore, when the cone 17 rotates in this state, the width of the annular space 21 changes. Reference numeral 22 denotes a mud feeding pipe (fluid discharge pipe) for discharging earth and sand in the form of a slurry, one end of which communicates with the annular space 21 through a lower through hole 15b formed in the lid 15, and the other end of the pipe 22. is connected to a processing device (not shown). Further, 23 is a mud feeding pipe for injecting slurry water into the earth and sand intake chamber 5, one end of which is connected to the rear partition wall 11 of the earth and sand intake chamber 5, and the other end of which is connected to a mud feeding pump (not shown). )It is connected to the.

In the above configuration, the earth and sand excavated by the rotation of the cutter head 6 enters the earth and sand intake chamber 5, where it is made into a slurry. This slurry of earth and sand is transferred rearward within the cylindrical casing 12 by the ribbon-shaped screw blades 13 and enters the annular space 21 between the casing 14 and the conical body 17, where coarse particles contained in the earth and sand are removed. The solids are ground by the conical body 17 that rotates eccentrically relative to the casing 14, and are discharged from the slurry drain pipe 22 by slurry transport. Note that the effect of grinding coarse solid matter is increased by the protruding bands 18 and 19 attached to the casing 14 and the conical body 17.

By the way, in the above embodiment, the ribbon-shaped screw blade and the cone are connected and one electric motor is used to rotate both, but it is also possible to connect electric motors to each and rotate them separately. .

Effects of the invention According to the configuration of the invention described above, the conical casing is connected to the rear end discharge port of the cylindrical casing, and the conical body is rotated at an eccentric position within the casing. Coarse solids can be continuously ground in the annular space between the crusher and the body, and since the coarse solids are ground by rotational movement, no large force is required compared to conventional compression crushing.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of one embodiment of the present invention, Fig. 2 is a view taken in the direction of - arrow in Fig. 1, and Fig. 3 is a - arrow view in Fig. 1.
It is an arrow view. 2...Shield body, 5...Sediment intake chamber, 6...
... cut head, 7 ... soil removal device, 11 ... rear bulkhead, 12 ... cylindrical casing, 12a ... discharge port, 13 ... ribbon-shaped screw blade, 14 ...
Casing, 14a... Inner surface, 15... Lid, 1
7... Cone, 17a... Outer surface, 18, 19...
Protruding band, 20... Electric motor, 21... Annular space, 2
2...Sludge drainage pipe.

Claims (1)

[Scope of utility model registration request] The small-diameter opening side of the conical casing is connected to the rear end discharge port of the cylindrical casing of a screw conveyor-type earth removal device that discharges earth and sand from the earth and sand intake chamber formed in the cut head, and a conical The cone body is rotatably provided at a position eccentric to the center line of the casing, and the outer surface inclination angle with respect to the rotation axis of the cone body is larger than the inner surface inclination angle with respect to the center line of the casing, and the rear end of the casing A shield excavator characterized in that a fluid discharge pipe is connected to the shield excavator, and a rotary drive device for rotating the conical body is provided.