JPS60195296A - Shield drilling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a shield tunneling machine.

[Background of the invention]

Refer to and explain.

In the conventional shield excavator shown in FIG. 1, the axial direction of the cool center shaft 5 is rotatably supported so that the axial direction of the shield shaft /I/1 coincides with the axial direction of the cool center shaft 5. The housing 15 is equipped with an oil motor 17, the center shaft 5 is provided with meshing teeth 5a, and the binion 17g of the oil motor 17 is meshed with the meshing teeth 5IIL. A screw conveyor 10t is disposed diagonally within the shield hull 1. That is, the front end of the casing 12 of the screw conveyor 10 is fixed to the lower part of the partition wall 2, and the screw conveyor 1
The inside of the chamber 0 is communicated with the inside of the chamber la. An earth and sand discharge port 11 is provided on the side of the casing 12, and the casing 12
A drive unit 10& is installed at the rear end of the machine. A blade 9 is attached to the rotating shaft 8a.
A screw 8, which is formed by implanting the screws in a spiral manner, is inserted into the casing 12, and the screw 8 and the driving portion 10a are linked. In the figure, reference numeral 7 indicates a stirring blade installed on the rear surface of the canterhend 4, and reference numeral 14 indicates a shield jack placed on the inner peripheral surface of the shield hull 1.

Next, the operation of this shield tunneling machine will be explained. The oil motor 17 is driven to rotate the cutter wheel, and an additive for promoting plastic fluidization of excavated soil is injected into the face from the injection port 6 through the center shaft 40 passage via the rotary joint 3. Then, the face is excavated by the canter head 4 of the canter wheel, and the excavated earth and sand is mechanically kneaded together with additives by the agitator x7. This additive-mixed earth and sand (hereinafter referred to as shore earth and sand) is taken into the chamber 1&, and the space between the face and the partition wall 2 is filled with earth and sand. This filled earth and sand is pressurized by the propulsive force of the shield jack 14, and while the upper pressure acts on the entire face to stabilize the face, the earth and sand in the screw conveyor 104CJ: chamber la is discharged. It is discharged from the outlet 11.

one! In addition, in the shield tunneling machine shown in FIG. 2, the periphery of the canter head 4 of the cutter wheel is rotatably supported by the bulkhead 2 via a turning ring 16. The partition wall 2 is provided with an inner partition 18 that covers the cutter wheel, and the inner partition wall 18 is equipped with an oil motor 17. Meshing teeth 4a are provided around the periphery, and a pinion 17a of the oil motor 17 is meshed with the meshing teeth 4a. A ribbon conveyor is arranged diagonally inside the shield hull 1. That is, the front end of the casing 21 attached to the ribbon conveyor is connected to the center of the inner circumferential partition wall 18, and the shoulder of the ribbon conveyor is communicated with the inside of the chamber 1a. A discharge port η is provided on the side surface of the casing 21, and a drive unit 20 is provided at the rear end of the casing 21.
Equip a. A spiral screw 19 is inserted into the seventh casing 21, and the screw 19 and the drive section 20& are linked.

Next, the operation of this shield tunneling machine will be explained. The oil motor 17 is driven to rotate the cutter wheel. Then, the face is excavated by the canter head 4 of the canter wheel, and the excavated earth and sand are transferred to the chamber l.
a, and the space between the face and the partition wall 2 and inner peripheral partition wall 18 is filled with dirt. This filled earth and sand is pressurized by the propulsive force of the shield jack 14, and while the earth and sand acts on the face and prevents the face from collapsing, the earth and sand in the chamber la is discharged from the discharge port by the application of the ribbon conveyor. It will be done.

However, since the former method discharges earth and sand to the screw conveyor 10, large boulders 13 cannot be discharged. That is, the screw conveyor 10 discharges earth and sand through a space defined by the casing 12, the rotation shaft 8a of the screw 80, and the blades 9, and since the space is small, it is not possible to discharge large boulders 131c. . Moreover, the canter wheel housing 1
5 and the casing of the screw conveyor 100 interfere with each other, so the diameter of the casing 12 of the screw conveyor 10 cannot be increased, and the diameter of the casing 12 is limited. As a result, large boulders cannot be discharged. Further, since the discharge port 11 of the screw conveyor 10 is opened on the side surface of the casing 12, when the earth and sand passes through the casing 12 and is discharged from the discharge port 11, the direction of the flow changes, making it easier to get stuck at the discharge port 11. There is a problem.

Furthermore, since the latter uses a ribbon conveyor, there is a space in the center of the spiral screw 19, which results in poor water-stopping properties. Therefore, even if excavated soil is filled between the face and the inner bulkhead 18 and the upper pressure is used to prevent the face from collapsing, the earth pressure cannot be maintained, and especially in gravel layers where groundwater pressure is high, groundwater It has the serious drawback that it ejects from the space in the center of the screw 19, often leading to collapse of the face. Furthermore, since it is difficult to construct a passageway for injecting additives to plastically fluidize the excavated soil, the cutter wheel 4 may become unable to rotate due to the frictional resistance of the excavated soil that fills the cutter chamber la, or the excavated soil itself may cause friction. Screw 1 inside cutter chamber la due to resistance
Problems may occur, such as the ribbon not moving to point 9 and being unable to be discharged by the ribbon conveyor. Furthermore, since the discharge port is located on the side surface of the casing 21, the flow of large boulders is changed, making them easy to get caught in.

[Object of the Invention] The present invention aims to provide a shield tunneling machine that improves the above-mentioned drawbacks.

[Summary of the invention]

The present invention uses a screw conveyor for the earth and sand discharge device to improve water stoppage, stabilize the face, and prevent underground water from erupting. The axis of the earth and sand ejector is arranged so that it matches the axis of the earth and sand ejector, and the diameter of the earth and sand ejector is increased to be able to eject large stones, and the rotating shaft of the earth and sand ejector and the center shaft of the cutter wheel are connected on the same axis. A passage for injection of additives is provided in the rotating shaft and center shaft.
The present invention is characterized in that additive material can be injected into the face, and a discharge port is provided at the rear end of the earth and sand discharge device, so that earth and sand can be smoothly discharged.

[Embodiments of the invention]

Hereinafter, one embodiment of the shield tunneling machine of the present invention will be described with reference to FIGS. 3 and 4.

The shielded excavator of the present invention in this embodiment has a front partition wall 37 and a rear partition wall 32 on the inner peripheral surface of the front opening of the shield hull 31, and a housing 39 extending from the rear partition wall 32. This housing 39 is connected to the rear bulkhead 32
It consists of an outer cylindrical part fixed to the outer cylindrical part, an annular plate fixed to the outer cylindrical part, an inner cylindrical part and a tapered cylindrical part fixed to the annular plate. This rear bulkhead 32 and the housing 3
A canter wheel is rotatably supported on the inner cylindrical portion of 9. This canter wheel aha, cutter head 36
&, and the seal tonneau 1 is placed in the center of the cutter head 36a.
a center shaft 44 provided in the central axis direction of the lever 31;
Seven center shafts 44 and cutter heads 36a
It consists of stirring blades 52 and 51 implanted in the cutter wheel, and a partition wall 34 provided on the rear surface side of the cutter wheel via a support beam 35. The center shaft 44 of the canter wheel is rotatably supported on the support leg 6 fixed to the /1 housing 39 of the shield hull 31, and the cutter wheel bulkhead 34 is connected to the rear bulkhead 32 of the seal nozzle 31 with a swing ring 33. Rotatably supported through. That is, this turning wheel 330 inner race is a shield ha A/
31, and the outer race of this swing wheel is fixed to that partition a32 of the cutter wheel. The oil motor 4 is attached to the housing 39 of the shield hull 31.
0, a pinion 41 is attached to the rotating shaft of the oil motor 40, a meshing tooth path is provided on the partition wall 32 of the cutter wheel, and the pinion 41 is meshed between the meshing teeth to drive the oil motor 40. You can rotate the Yoshikatsuta wheel. Said shield hull 31. Front bulkhead 37 of shield hull 31. Housing 39 of shield hull 31. Cutter wheel that canter
Head 36a.

The partition wall U of the cutter wheel forms a chamber 31a. A seal 42 is interposed between the front partition wall 37 of the shield hull 31 and the partition wall 34 of the cutter wheel,
A seal 43 is interposed between the housing 39 of the shield hull 31 and the partition wall 34 of the cutter wheel, and the chamber 3
The earth and sand in the canter wheel 1a is prevented from entering the housing 39 from the outer and inner periphery sides of the partition wall 34, and the swivel wheel 1a and pinion 41.1a in the housing 39 are prevented. This prevents the meshing teeth from being destroyed by that dirt.

A screw conveyor 46 as a dirt discharge device is arranged in the housing 39 thus formed. This screw conveyor 46 includes a casing 55 attached to the housing 39 in the direction of the central axis of the shield hull 31, a rotating shaft, a blade 53 embedded in a spiral shape on the rotating shaft, and a rear end of the casing 55. Oil motor 54 installed on the outer surface
and a discharge port (not shown) provided at the rear end of the casing 55. Inserting the screw 47 consisting of the rotating shaft and the blade 53 into the casing 55, linking the rear end of the screw 47 to the oil motor 54, and rotating the screw 47 by driving the oil motor 54. I can do it. The rotating shaft 48 of this screw conveyor 46 and the center shaft 44 of the canter wheel 36 are connected on the same axis, and a passage (not shown) for injecting additives is provided in the center shaft 44 and the rotating shaft 48. Center shaft 44 and rotating shaft 4
8 in the axial direction. An injection white piece is provided at the tip of the center shaft 44 so as to communicate with the passage, and a rotary joint 49 is provided at the rear end of the rotary shaft so as to communicate with the passage. Connect material injection means (not shown). A gate 57 is openably and closably disposed at the rear end of the casing 55 of the screw conveyor 46, and the gate 57 and the screw conveyor 4
A gate jack 56 is interposed between the earth and sand discharge port 6, and by expanding and contracting the gate jack 56, the gate 57 can be opened and closed to adjust the size of the earth and sand discharge port.

In the figure, reference numeral 59 indicates a segment forming the wall of the tunnel. Reference numeral 5B denotes a shield jack, which propels the shield hull 31 by taking a reaction force at the segment 59, pressurizes the mixture of excavated earth and sand filled in the face and the chamber 31a, and applies the mud pressure to the face. It acts on the entire surface to measure the stability of the face.

The shield tunneling machine of the present invention in this embodiment has the above-mentioned configuration, and its operation will be explained below.

First, an additive that promotes plastic fluidization of excavated soil is supplied to the rotary joint 49 by the additive supply means, and the oil motor 40 is driven.

Then, the additive material is attached to the rotary joint 492 rotating shaft 48
The cutter wheel rotates to excavate the face with the cutter head 36a while the injector is injected from the injection port through the passage in the center shaft 44 toward the face. The excavated earth and sand and the additive material are stirred and kneaded by the stirring blades 51 and 52, and are filled in the face and the chamber 31a. In this state, the shield jack 58 is extended and the oil motor 54 is driven. Then,
The mixture of excavated soil and additive material is pressurized by the propulsion force of the shield jack 58, and the earth pressure of the mixture acts on the entire face to stabilize the face, while the mixture is transferred to the face and chamber by the screw conveyor 46. 31a, while the shield hull 31 is propelled.

As described above, the shield excavator of the present invention in this embodiment uses the screw conveyor 46 as the earth and sand discharge device, and therefore has high water-stopping properties. Therefore, the earth pressure is adjusted, that is, the rotational speed of the screw 47 is increased or decreased to adjust the amount of soil discharged.
It is possible to control the earth pressure in the chamber 31a and adjust the size of the earthen that acts on the face, thereby making it possible to measure the stability of the face.In addition, it is possible to control groundwater in gravel and gravel layers where groundwater is abundant and water pressure is high. It is possible to prevent an eruption. Also, screw conveyor weak to shield hull 31 to 3
9D, shaft of screw conveyor 46 and shield hull 31
Since the diameter of the screw conveyor 46 can be increased to nearly the inner diameter of the turning ring, the diameter of the screw conveyor 46 can be increased to nearly the inner diameter of the turning ring. Therefore, large boulders can be discharged. Furthermore, the rotating shaft of the screw conveyor 46 and the center shaft of the cutter wheel 44 are connected on the same axis, and a passage for injecting the additive is provided in the rotating shaft and the center shaft. can be injected. Moreover, screw conveyor 46 (7
) Since a sand discharge port was provided at the rear end of the casing 55,
The discharge port is opened in the direction of flow of the earth and sand, allowing the earth and sand to be smoothly discharged. In the above-described embodiment, a gate 57 is provided at the earth and sand discharge port of the screw conveyor 46 so as to be openable and closable. Therefore, the size of the opening of the discharge port can be adjusted, that is, the amount of earth and sand discharged can be adjusted.

〔Effect of the invention〕

As is clear from the above embodiments, the shield tunneling machine of the present invention can achieve the following effects.

1. It is possible to measure the stability of the face and prevent the generation of qt of groundwater.

2. Large boulders can be ejected.

3. Additives can be injected into the face.

4. Earth and sand can be discharged smoothly.

[Brief explanation of drawings]

Figure 1' is a sectional view of a screw conveyor type shield tunneling machine, Figure 2 is a sectional view of a ribbon conveyor type shield tunneling machine, and Figures 3 and 4 show an embodiment of the shield tunneling machine of the present invention. 3 is a cross-sectional view, and FIG. 4 is a view taken in the direction of the ■ arrow in FIG. 31... Shield hull, 31a... Chamber, 32
... Rear bulkhead, A... Swivel ring, A... Cutter wheel, 36 &... Cutter head, 37... Front bulkhead, 39... Housing, 40... Oil motor, 44... ... Center shaft, 46 ... Screw conveyor, 47 ... Screw, rotation ... Rotating shaft, 4
9...Rotary joint, Seki...Inlet, 53.
...Blade, 54...Oil sweater, 55...Casing, 56...Gate jack, 57...Discharge port gate. Patent applicant Hitachi Construction Machinery Co., Ltd. Agent Patent attorney Tadashi Akimoto Figure 1 Figure 2

Claims (1)

[Claims] 1. A shield hull, a canter wheel rotatably disposed in the front opening of the shield hull, a partition wall provided on the inner peripheral surface of the shield hull, the partition wall, a cutter wheel, and a canter wheel rotatably disposed in the front opening of the shield hull. A chamber formed in the shield hull,
The earth and sand discharge device is arranged on the partition wall and communicates with the chamber, and the additive material injection means is provided with an injection port toward the face, and the additive material is injected from the injection port while rotating the cutter wheel. , a shield excavator that excavates a face, mixes the excavated earth and sand with an additive, takes the additive-mixed earth and sand into the chamber, and discharges it outside the machine by the earth and sand discharge device, wherein the canter wheel is , a cutter head, and a center shaft provided at the center of the canter head in the axial direction of the shield hull, and the earth and sand discharge device includes a casing whose front end is attached to the bulkhead in the axial direction of the shield hull, and a rotating A shaft, a spiral blade attached to the rotating shaft, a drive section,
and an earth and sand discharge port provided at the rear end of the casing,
A screw consisting of the rotary shaft and blades is inserted into the casing, and the screw is linked with the drive section to connect the rotary shaft of the earth and sand discharge device to the counter.
A center shaft of the wheel is connected on the same axis, a passage for injecting the additive is provided in the center shaft and the rotating shaft in the axial direction of the center shaft and the rotating shaft, and a passage for injecting the additive is provided at the tip of the center shaft. A shield excavator characterized in that an injection port communicating with a passage is provided, and an additive injection means is connected to the additive injection passage. 2. The shield excavator according to claim 1, wherein the earth and sand discharge port of the earth and sand discharge device is provided with a gate that can be opened and closed to adjust the size of the discharge port.