JP3102774B2 - Underground shield excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavator for underground joining that excavates from both sides of a joining point and joins in the middle when constructing a tunnel or a sewer.

[0002]

2. Description of the Related Art In the construction of a sewer, when two shield excavators are to be excavated from both sides of a sewer to be built, the ground is conventionally improved or a shaft is provided at the point where the shield excavators reach each other. I was In this case, there is a problem that it is necessary to secure land for installation of the shaft or to consider the influence of the surrounding ground due to ground improvement. In order to solve these problems, a shield excavator in which a penetration ring penetrates between shield excavators in the ground to perform joining is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 2-308089 (name: shield excavator for underground joining). Is disclosed.

In this prior art, a ring-shaped penetration ring is provided on one extruding side shield excavator, and a pressure receiving rubber is provided on the other receiving side excavating machine. When such a shield machine is used, the penetration ring is extruded from the shield machine on the extrusion side at the reaching point,
The extruded penetrating ring is inserted into the pressure receiving rubber of the receiving shield excavator, thus joining the two shield excavators underground. In such prior art,
By covering the gap between the two shield excavators with the penetrating ring at the junction without providing the ground improvement and the shaft at the junction, soil retention and water stoppage to the surrounding ground can be performed.

[0004] Such a shield excavator for underground joining is provided with a cutter disk structure that rotates and excavates a front surface thereof, and the cutter disk structure includes a main cutter disk and an outer peripheral side of the main cutter disk. And a plurality of telescopic cutter means are provided between the main cutter disk and the outer peripheral ring.
This extensible cutter means is held in an extended state during excavation, and its tip is connected to the outer peripheral ring, and is driven to rotate integrally with the main cutter disk and the outer peripheral ring. on the other hand,
When joining both shield excavators underground, this telescopic cutter means keeps the penetrating ring mounted on one shield excavator in a contracted state so that it is inserted between the main cutter disc and the outer ring. Then, the connection between the telescopic cutter means and the outer peripheral ring is released (at this time, the outer peripheral ring is temporarily held by the ring support means). In the case where a part of the telescopic cutter is connected to the outer peripheral ring as described above, conventionally, for example, as shown in FIG. And so on.

That is, as shown in FIG. 5, the telescopic cutter means 1 and the outer peripheral ring 2 are connected via a pin 3, and these pins 3 are connected to the telescopic cutter means 1 and the outer peripheral ring 2 by welding. I have. Therefore, at the time of underground joining, by cutting the pin 3 or breaking the joint by welding, the connection between the outer peripheral ring 2 and the telescopic cutter 1 is released, and the telescopic cutter means 1 and the outer peripheral ring 2
And are separated.

[0006]

In the prior art as described above, since the telescopic cutter means 1 and the outer ring 2 are connected via the pin 3 to be welded, the telescopic cutter means 1 and the outer ring 2 are connected. There is a problem that it takes a long time for the joining operation for joining and the unjoining operation for canceling the joining, and the workability is poor. Further, there is a problem that the operation for cutting the pin 3 or breaking the welding becomes complicated, and a tool for the operation is required. In particular, when joining both shield excavators, it is difficult for an operator to perform an operation on the front side of the shield excavator, so that the above-described operation becomes extremely difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to reliably connect a telescopic cutter to an outer peripheral ring, to facilitate connection and detachment of the telescopic cutter to an outer ring, and to improve the workability thereof. An object of the present invention is to provide a shield machine for medium joining.

[0008]

SUMMARY OF THE INVENTION The present invention provides an excavator main body, a cutter disk structure rotatably provided on a front surface of the excavator main body, and a driving source for rotating the cutter disk structure. The cutter disk structure comprises: a main cutter disk disposed on a front surface of the excavator main body; an outer peripheral ring provided radially outward of the main cutter disk; and A plurality of telescopic cutter means which are provided at intervals in the circumferential direction and are provided so as to be extendable and contractible between the main cutter disc and the outer peripheral ring; and a plurality of telescopic cutter means are provided at intervals in the circumferential direction of the main cutter disc. And a ring support means for temporarily supporting the outer ring when a penetrating ring is interposed between the main cutter disc and the outer ring. In the excavator, the telescopic cutter means includes an elastically deformable cylinder tube, a piston movable relatively to the cylinder tube, and a pressure for supplying pressure oil between the cylinder tube and the piston. An oil supply source, the main cutter disc and the outer peripheral ring are removably connected via the telescopic cutter means by the relative extension of the piston, and the telescopic cutter means is usually The locked state is maintained by the elastic frictional force between the piston and the cylinder tube, and when the pressure oil is supplied from the pressure oil supply source, the cylinder tube is elastically expanded and deformed to release the locked state. A shield excavator for underground bonding characterized in that:

According to the present invention, at the time of excavation, the cutter disk structure provided on the front surface of the body of the excavator is rotationally driven by the drive source, thereby excavating the ground. At this time, the telescopic cutter means of the cutter disk structure is held in an extended state, the telescopic cutter means is connected to the outer peripheral ring, and the main cutter disk, the telescopic cutter means and the outer peripheral ring constitute an integral cutter disk structure, These are integrally rotated and driven. Since a plurality of telescopic cutters are provided at intervals in the circumferential direction of the main cutter disc, the outer peripheral ring can be reliably supported via these telescopic cutters. This telescopic cutter means has an elastically deformable cylinder tube and a piston which is relatively expandable and contractible with respect to the cylinder tube, and is held in a locked state by elastic friction between the cylinder tube and the piston during excavation. You. Therefore, the engagement state between the telescopic cutter means and the outer peripheral ring is not released by the contraction of the telescopic cutter means due to vibration during excavation,
The connected state of the main cutter disk and the outer peripheral ring via the telescopic cutter means is reliably maintained.

When the penetrating ring is interposed between the main cutter disk and the outer peripheral ring, the telescopic cutter means is contracted. At this time, the outer peripheral ring is temporarily supported by the ring support means. That is, when the penetrating ring is interposed, for example, the ring supporting means first supports the outer peripheral ring, and the telescopic cutter means is contracted in this supporting state. When the telescopic cutter means is contracted, pressure oil is supplied between the cylinder tube and the piston from a pressure oil supply source. When the pressure oil is supplied in this manner, the cylinder tube elastically expands and deforms due to the action of the pressure oil, whereby the piston can move with respect to the cylinder tube, and the locked state by the elastic frictional force is released. By contracting the telescopic cutter means after releasing the locked state, the connection between the telescopic cutter means and the outer peripheral ring is released, and the engagement state between the main cutter disc and the outer peripheral ring is released.

As described above, by extending the telescopic cutter means, the telescopic cutter means and the outer peripheral ring are connected,
Also, by contracting the telescopic cutter means, the connection between the telescopic cutter means and the outer peripheral ring can be released. Also, due to the elastic frictional force between the elastically deformable cylinder tube and piston, welding is not performed as in the past,
The telescopic cutter means and the outer ring can be reliably held in a connected state.

In the present invention, the outer peripheral ring may be provided with a fitting recess corresponding to each of the telescopic cutter means and the ring support means, and when excavating with the cutter disk structure, the telescopic cutter means may be provided. Are held in an extended state, and a part of the telescopic cutter means is fitted in a corresponding fitting recess of the outer peripheral ring, while the penetrating ring is interposed between the cutter disc structure and the outer peripheral ring. When the retractable cutter means is held in a contracted state, the fitting between the retractable cutter means and the corresponding fitting recess of the outer peripheral ring is released, and a part of the ring support means is connected to the outer peripheral ring. Is fitted in the corresponding fitting recess.

According to the present invention, since the fitting recess is formed in the outer peripheral ring corresponding to the telescopic cutter means and the ring support means, a part of the telescopic cutter means is extended by extending the telescopic cutter means. The telescopic cutter means and the outer peripheral ring are held in the engaged state by fitting into the fitting recess. Therefore, the main cutter disk and the outer peripheral ring are connected via the telescopic cutter means, and they are integrally rotated during excavation. On the other hand, when a penetrating ring is interposed between the main cutter disc and the outer ring, the ring supporting means is extended, a part of the ring is fitted into the fitting recess of the outer ring, and the ring supporting means temporarily fixes the outer ring. I support it.
Thereafter, the telescopic cutter is contracted, whereby the connection between the telescopic cutter and the outer peripheral ring is released, and the penetrating ring can be inserted.

[0014]

1 is a front view of an embodiment of a shield excavator for underground joining according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. It is sectional drawing seen. 1 and 2, the illustrated underground shield excavator 10 is, for example, a shield excavator used to excavate a sewer to be built from both sides and join it underground to complete a tunnel. . A shield excavator 10 on the receiving side, which excavates from one side of the joining point, includes a pressure receiving ring 22 in a cutter chamber 21 at the front of the excavator body 11.
It has. On the other hand, the extruder-side shield excavator that excavates from the other side includes a penetrating ring inserted into the pressure receiving ring 22. When joining these shield excavators underground, as will be described later with reference to FIG.
The penetrating ring is extruded outward from the extruding shield excavator, the extruded penetrating ring penetrates into the pressure receiving ring 22 of the receiving shield excavator 10, and a gap between the two shield excavators is formed. Covered by a ring,
As a result, soil retention and water stoppage on the surrounding ground are performed.

The shield machine 10 includes a machine body 11 having a cylindrical outer shape. A cutter disk structure 17 is provided on the front surface of the excavator body 11, and the cutter disk structure 17 is drivingly connected to a drive source 13 such as a hydraulic motor. Therefore, this cutter disc structure 1
Reference numeral 7 denotes a cutter disk structure 17 which is rotated around a central axis L1 of the machine body 11 (extending in a direction perpendicular to the plane of FIG. 1 and extending in a horizontal direction in FIG. 2).
The ground is excavated as required by such a rotational drive. An erector 24 is provided at the rear end inside the excavator main body 11, and the segment 25 is attached from the inside to the tunnel after excavation by the erector 24. A plurality of shield jacks 26 are provided at the rear of the excavator body 11 and in front of the erector 24 at intervals in the circumferential direction. The shield jack 26 presses the segment 25 adhered inside the tunnel by extending, and the shield excavator 10 moves forward by the reaction force of the pressing force.

The earth and sand excavated by the cutter disk structure 17 is introduced into the cutter chamber 21 behind (to the right in FIG. 2) the cutter disk structure 17.
The water is discharged to the rear through a drain pipe 32 together with the water injected into the cutter chamber 21 through the water supply pipe 31. The excavator body 11 has a front trunk 28 provided at a front part and a rear trunk 29 provided at a rear part thereof, and the front trunk 28 and the rear trunk 29 extend in a vertical direction substantially perpendicular to the axis L1. Axis L
2 are connected to each other so as to be relatively angularly displaceable in a lateral direction (perpendicular to the plane of FIG. 2) with the center of angular displacement being 2, and a plurality of front and rear bodies 29 and 29 for maintaining a relative angle are provided. Are provided on both sides of the axis L2. With such a configuration, the shield machine 10 can change the direction in the lateral direction.

The illustrated cutter disk structure 17 includes a disk-shaped main cutter disk 12 that covers substantially the entire front surface of the excavator main body 11, and a ring-shaped outer periphery disposed on the outer peripheral side of the main cutter disk 12. Ring 14, telescopic cutter means 15a, 15b, 15c interposed between the main cutter disk 12 and the outer peripheral ring 14, and copy cutters 16a,
16b. The main cutter disk 17 is provided with a plurality of (three in this embodiment) telescopic cutter means 15a to 15c radially about the rotation axis L1. A plurality of inner circumferential cutters 1 are provided on the inner circumferential portion on the front surface of the main cutter disk 12.
8 is fixed. A center cutter 37 is provided at the center of the front surface of the main cutter disk 12. The outer peripheral ring 14 is made of steel, has a ring shape centered on the axis L1 of the excavator main body 11, and has the above-mentioned telescopic cutter means 15a to 15e.
15c is supported by these in an extended state. A plurality of outer peripheral cutters 19 are provided on the outer peripheral ring 14 at intervals in the circumferential direction. By the rotation of the cutter disk structure 17, the outer peripheral ring 14 excavates the outermost peripheral portion, and the inner peripheral cutter 18 and the center cutter 37 provided on the main cutter disk 12 excavate the inner side of the outer peripheral ring 14. Cutter bits 27a to 27c are provided at the distal ends of the telescopic cutter means 15a to 15c, respectively.
Excavation is performed between the outer ring 2 and the outer ring 14.

A plurality of, in this embodiment, two copy cutters 16a and 16b are provided on the main cutter disk 12 between the telescopic cutters 15a and 15b and between the telescopic cutters 15a and 15b.
a, 15c. Cutter bits 33a and 33b are provided at the distal ends of the copy cutter means 16a and 16b so as to be able to protrude and retract on the outer peripheral side of the outer peripheral ring 14. The copy cutter means 16a and 16b are used for performing an overcut on the outer peripheral side of the excavator body 11 when the shield excavator 10 changes the excavation direction, and as described later, during underground joining. When a penetrating ring (described later) is interposed between the main cutter disk 12 and the outer peripheral ring 14, it functions as a ring supporting means for temporarily supporting the outer peripheral ring 14.

At the distal ends of the telescopic cutter means 15a to 15c, truncated short conical fitting projections 34a to 34c are provided, respectively, and the outer peripheral ring 14 is provided with the fitting projections 34a to 34c.
The fitting recesses 35a to 35c penetrate and are formed corresponding to c. Further, fitting recesses 36a, 36b through which the cutter bits 33a, 33b of the copy cutter means 16a, 16b are inserted are formed on the outer peripheral ring 14, respectively.
a, 33b are formed to penetrate the outer peripheral ring 14.

At the time of excavation, each of the telescopic cutter means 15a-1
5c is held in an extended state, and each of the fitting projections 34a to 34c
Are fitted and held in the fitting recesses 35 a to 35 c of the outer peripheral ring 14, so that the expansion and contraction cutter means 15 a to 15 c
c and the outer ring 14 are securely connected. Therefore, the main cutter disc 12, the outer peripheral ring 14, and the telescopic cutter means 15a to 15c integrally constitute a cutter disc structure 17, and the cutter disc structure 17 is rotationally driven by the drive source 13 about the rotation axis L1, Thus, the ground on the front side of the machine body 11 is excavated.

At the time of excavation, the telescopic cutter means 1
5a to 15c are extended and connected to the outer peripheral ring 14 for excavation, while at the time of underground joining, telescopic cutter means 15a to 15c are used.
The connection between the main cutter disk 12 and the outer peripheral ring 14 is released by contracting 15c. This is to prevent the cutter bits 27a to 27c of the telescopic cutter means 15a to 15c projecting forward (to the left in FIG. 2) from the outer peripheral ring 14 from interfering with the penetration ring (described later). When contracting the telescopic cutter means 15a to 15c,
In order to prevent the outer ring 14 from freeing and shifting downward, the copy cutter means 16a, 16b temporarily supports the outer ring 14. At this time, the outer ring 14
The cutter bits 33a, 33b are supported by the stepped portions 38a, 38b of the copy cutter means 16a, 16b projecting therefrom,
The copy cutter means 16a and 16b function as ring support means.

Telescopic cutter means 15a and telescopic cutter means 1
The angle θ1 between the telescopic cutter means 15b and the telescopic cutter means 15c is also set to 120 °, and the angle θ3 between the telescopic cutter means 15c and the telescopic cutter means 15a is also set to 120 °. °. As described above, since the telescopic cutter means 15a to 15c are disposed at equal angles in the circumferential direction, the outer peripheral ring 1
4 is stably supported. In addition, telescopic cutter means 15a ~
The fitting projections 34 a to 34 c of the outer ring 1 fit into the fitting recesses 35 a to 35 c of the outer ring 14.
Since the outer ring 4 is connected, the outer peripheral ring 14 is securely supported without shifting in the circumferential direction during rotation and excavation. The fitting projections 34a to 34c do not protrude outward in the radial direction from the outer peripheral surface of the outer peripheral ring 14 during the fitting.

The angles θ4 and θ5 formed by the copy cutter means 16a and 16b and the telescopic cutter means 15a are 60
°. That is, the angle θ4 + θ5 between the copy cutter means 16a and the copy cutter means 16b is 120 °.
Is chosen. Such copy cutter means 16a, 16
By extending b and making the cutter bits 33a, 33b protrude from the fitting recesses 36a, 36b, the outer peripheral ring 14 can be reliably supported at the time of underground joining.

The pressure receiving ring 22 provided in the cutter chamber 21 is supported from behind by a plurality of pressure receiving ring jacks 23 spaced apart in the circumferential direction, in this embodiment, four pressure receiving ring jacks 23.

The telescopic cutter means 15a to 15c have substantially the same configuration, and FIG. 3 is a simplified sectional view showing one configuration of the telescopic cutter means. The illustrated telescopic cutter device 15 (the telescopic cutter means 15a to 15c have substantially the same configuration,
) Is a cylinder cylinder 48 and a piston 46.
The piston 46 includes a piston portion 50 and a piston rod portion 49. The distal end of the piston rod portion 49 is connected to the center portion 60 of the main cutter disk 12, and the cylinder body 48 is held by the main cutter disk 12 so as to be displaceable in the radial direction. The cylinder tube 45 is provided in a cylinder body 48,
6 is provided in the cylinder tube 45. A first oil chamber 51 is provided on one side of the piston portion 50, and a second oil chamber 52 is provided on the other side. First and second oil passages 57 and 58 communicating with the first and second oil chambers 51 and 52 are formed in the piston 46. The switching valve 53 is connected to the first and second oil passages 57 and 58.
When the switching valve 53 is switched to the left position in FIG. 3 and is positioned at the first position, the pressure oil from the pump 54 is supplied to the first oil passage 5.
7 to a first oil chamber 51 and a second oil chamber 52
Is returned to the tank 55 via the second oil passage 58, whereby the piston 46 is extended relatively to the cylinder tube 45, and the telescopic cutter means 15 is extended. On the other hand, when the switching valve 53 is switched to the right position in FIG.
The oil is supplied to the second oil chamber 58 through the oil passage 58 and
The pressure oil in the oil chamber 51 is returned to the tank 55 via the first oil passage 57, whereby the piston 46 is contracted relatively to the cylinder tube 45, and the telescopic cutter means 15 is contracted.

The cylinder tube 45 is formed of a metal material which can be elastically deformed, and a cylinder tube 4 is provided between an outer peripheral surface of the cylinder tube 45 and an inner peripheral surface of the cylinder body 48.
5 is provided with a gap that allows elastic expansion deformation. The piston portion 50 normally comes into frictional contact with the piston portion 50 with relatively large frictional force due to the elastic frictional force due to the elastic restoring force of the cylinder tube 45, and the piston portion 5
The outer peripheral surface of the cylinder 0 and the inner peripheral surface of the cylinder tube 45 are locked and held by this frictional force in a state of an interference fit. The third oil passage 5 extends from the distal end of the piston rod portion 49 to the outer peripheral surface of the piston portion 50.
9 are formed. The third pressurized oil from the pressurized oil supply source 47
When oil is supplied between the outer peripheral surface of the piston portion 50 and the inner peripheral surface of the cylinder tube 45 via the oil passage 59, pressure oil is interposed between the cylinder tube 45 and the piston portion 50,
The cylinder tube 45 elastically expands and deforms, and the piston 46 is inserted between the piston portion 50 and the cylinder tube 45.
Is formed, and the locked state described above is released. In this unlocked state, the piston 46 can be relatively moved with respect to the cylinder tube 45 with a relatively small force, and the piston portion 46 is relatively displaced by switching the switching valve 53 as described above. Thus, the telescopic cutter means 15 can be extended or contracted. In order to stop the displacement drive of the telescopic cutter means 15, first, the switching valve 53 is switched to the neutral position, and then the pressure oil between the piston portion 50 and the cylinder tube 45 may be discharged through the third oil passage 59. By doing so, the cylinder tube 45 is frictionally coupled to the cylinder portion 50 by the elastic restoring force, and the locked state is again achieved.

As described above, the telescopic cutter means 15 is held in a locked state while extending and supporting the outer peripheral ring 14. Therefore, it is possible to prevent the expansion / contraction cutter means 15 from contracting due to vibrations during excavation and the like, so that the fitting projection 34 is disengaged from the fitting recess 36 of the outer peripheral ring 14 and the outer peripheral ring 14 is detached. 14 can be reliably supported.

The main cutter disk 12 is provided with a sensor 56 for detecting the cylinder body 48 when the telescopic cutter means 15 is shortened. The sensor 56 is realized by, for example, a capacitance type proximity sensor. For example, when the sensor 56 detects that the telescopic cutter means 15 has contracted, the switching valve 53 can be controlled to switch to the neutral position. . Further, a sensor is provided for detecting that the telescopic cutter means 15 is extended and supports the outer peripheral ring 14, and when the extended state of the telescopic cutter means 15 is detected by this sensor, the switching valve 53 is switched to the neutral position. It is also possible to control so that the pressure oil between the piston 45 and the piston portion 50 is drained to be in the locked state.

FIG. 4 is a simplified sectional view for explaining the underground joining of the shield machines 10 and 71. As shown in FIG. Excavation was performed from two sides of the joining point with two shield excavators 10, 71 (one of the shield excavators 10 was described with reference to FIGS. 1 to 3), and excavation was completed earlier, for example, receiving Cutter disk structure 17 of the side shield machine 10
Then, the cutter disk structure 73 of the extruder-side shield machine 71 is brought close to just before the two come into contact with each other. afterwards,
The copy cutter means 16 of the extruding shield excavator 70 and the receiving shield excavator 10 are extended, and the outer peripheral rings 14, 72 of the shield excavators 10, 70 are temporarily supported by the copy cutter means 16. After that, the telescopic cutter means 15a to 15c of each shield machine 10, 70
For example, sequentially or simultaneously. Then, in this state, the penetration ring 71 is extruded from the extrusion-side shield excavator 70 to just before the copy cutter means (not shown) of the extrusion-side shield excavator 70. At this time, one end 71 a of the penetrating ring 72 in the axial direction is
The outer ring 72 is prevented from coming off the penetrating ring 71 even when the copy cutter is contracted. In this state, the copy cutter means of the extruder-side shield machine 70 is shortened, and the penetrating ring 71 is extruded immediately before the copy cutter means 16 of the receiving-side shield machine 10. When the penetrating ring 71 is extruded in this manner, as shown in FIG. 4A, one end 71a of the penetrating ring 71 is inserted into the outer peripheral ring 14 of the receiving-side shield excavator 10, so that the copy cutter means 16 is provided. Is prevented from coming off from the penetrating ring 71 even if is contracted.

Thereafter, the copy cutter means 16 is contracted,
It pushes out until one end part 71a of penetration ring 71 is inserted in pressure receiving ring 22 of receiving side shield machine 10. When the penetrating ring 71 is pushed out in this way, as shown in FIG. 4B, the distal end of the penetrating ring 71 is inserted into the pressure receiving ring 22 of the receiving-side shield excavator 10. Thus, the joining of the two shield machines 10 and 70 is completed.
After that, backfill is injected into the joint and shield excavator 1
0,70 is dismantled and removed, water pipes are laid, and lining concrete is poured.

The outer ring 14 is supported by the telescopic cutter means 15 having the cylinder tube 45 and the piston 46 and the outer ring 14 is temporarily supported by the copy cutter means 16 at the time of joining. Can be used not only for the shield excavator 10, but also for the extruder-side shield excavator 72.

In this embodiment, the copy cutter means 1
Although the structure of the shield machine is simplified by making the ring 6 function as ring support means at the time of joining, a ring support means for supporting the outer peripheral ring may be separately provided instead. In a shield machine in which no copy cutter is provided, the main cutter disk 12 can be provided with a ring support that expands and contracts in the radial direction to temporarily support the outer peripheral ring. Further, the shield machine according to the present invention is used not only for construction of sewers but also for construction of general tunnels.

[0033]

According to the shield machine of the first aspect of the present invention, at the time of excavation, the cutter disk structure provided on the front surface of the machine of the excavator is rotationally driven by the drive source, thereby excavating the ground. . At this time, the telescopic cutter means of the cutter disc structure is held in an extended state, the telescopic cutter means is connected to the outer peripheral ring, and the main cutter disc,
The telescopic cutter means and the outer peripheral ring constitute an integral cutter disc structure, which is integrally rotated. Since a plurality of telescopic cutters are provided at intervals in the circumferential direction of the main cutter disc, the outer peripheral ring can be reliably supported via these telescopic cutters.
This telescopic cutter means has an elastically deformable cylinder tube and a piston which is relatively expandable and contractible with respect to the cylinder tube, and is held in a locked state by elastic friction between the cylinder tube and the piston during excavation. You. Therefore, the engagement state between the telescopic cutter means and the outer peripheral ring is not released due to the contraction of the telescopic cutter means due to vibrations during excavation, and the coupling state between the main cutter disc and the outer peripheral ring via the telescopic cutter means is not changed. It is securely held.

When the penetrating ring is interposed between the main cutter disk and the outer peripheral ring, the telescopic cutter means is contracted. At this time, the outer peripheral ring is temporarily supported by the ring support means. That is, when the penetrating ring is interposed, for example, the ring supporting means first supports the outer peripheral ring, and the telescopic cutter means is contracted in this supporting state. When the telescopic cutter means is contracted, pressure oil is supplied between the cylinder tube and the piston from a pressure oil supply source. When the pressure oil is supplied in this manner, the cylinder tube elastically expands and deforms due to the action of the pressure oil, whereby the piston can move with respect to the cylinder tube, and the locked state by the elastic frictional force is released. By contracting the telescopic cutter means after releasing the locked state, the connection between the telescopic cutter means and the outer peripheral ring is released, and the engagement state between the main cutter disc and the outer peripheral ring is released.

As described above, by extending the telescopic cutter means, the telescopic cutter means and the outer peripheral ring are connected,
Also, by contracting the telescopic cutter means, the connection between the telescopic cutter means and the outer peripheral ring can be released. Also, due to the elastic frictional force between the elastically deformable cylinder tube and piston, welding is not performed as in the past,
The telescopic cutter means and the outer ring can be reliably held in a connected state.

According to the shield machine of the second aspect of the present invention, since the fitting recess is formed in the outer peripheral ring corresponding to the telescopic cutter means and the ring support means, the telescopic cutter means can be extended. As a result, a part of the telescopic cutter means is fitted into the fitting recess, and the telescopic cutter means and the outer peripheral ring are held in an engaged state. Therefore, the main cutter disk and the outer peripheral ring are connected via the telescopic cutter means, and they are integrally rotated during excavation. on the other hand,
When a penetrating ring is interposed between the main cutter disc and the outer ring, the ring supporting means is extended, a part of the ring is fitted into the fitting recess of the outer ring, and the ring supporting means temporarily fixes the outer ring. To support. Thereafter, the telescopic cutter is contracted, whereby the connection between the telescopic cutter and the outer peripheral ring is released, and the penetrating ring can be inserted.

[Brief description of the drawings]

FIG. 1 is a front view showing a shield machine for underground joining according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view showing a telescopic cutter means.

FIG. 4 is a simplified cross-sectional view for explaining a joining state of the shield machine.

FIG. 5 is a partial front view showing a simplified state of a connection between a telescopic cutter means and an outer peripheral ring of a conventional underground joining shield machine.

[Explanation of symbols]

 10, 70 Shield excavator for underground joining 11 Excavator main body 12 Main cutter disk 13 Drive source 14 Outer ring 15a, 15b, 15c Telescopic cutter means 16a, 16b Copy cutter means 17 Cutter disk structure 18 Inner peripheral cutter 19 Outer peripheral cutter 22 Pressure receiving ring 27 Cutter bit 35, 36 Fitting recess 45 Cylinder tube 46 Piston 47 Pressure oil supply source 71 Penetration ring 72 Outer ring

Continuation of front page (72) Inventor Osamu Yoshino 1-3-3 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe Head Office (56) References JP-A-10-184271 (JP, A) Hei 5-195534 (JP, A) JP 7-98493 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 301

Claims (2)

(57) [Claims] 1. An excavator main body, a cutter disk structure rotatably provided on a front surface of the excavator main body, and a drive source for rotationally driving the cutter disk structure. The structure includes a main cutter disk disposed on the front face of the excavator main body, an outer peripheral ring provided radially outward of the main cutter disk, and a plurality of the main cutter disks spaced circumferentially from the main cutter disk. A plurality of telescopic cutter means provided so as to extend and contract between the main cutter disc and the outer peripheral ring, and a plurality of telescopic cutter means provided at intervals in a circumferential direction of the main cutter disc, and A shield support machine for underground joining having a ring supporting means for temporarily supporting the outer peripheral ring when a penetration ring is interposed between the outer peripheral ring and the penetration ring; The contracting cutter means includes an elastically deformable cylinder tube, a piston movable relative to the cylinder tube, and a pressure oil supply source for supplying pressure oil between the cylinder tube and the piston. The main cutter disc and the outer peripheral ring are removably connected via the telescopic cutter means by relatively extending the piston, and the telescopic cutter means usually comprises the piston and the cylinder. The lock state is maintained by the elastic frictional force with the tube, and when the pressure oil is supplied from the pressure oil supply source, the cylinder tube is elastically expanded and deformed to release the lock state. Underground joining shield machine. 2. A fitting recess is formed in the outer peripheral ring corresponding to each of the telescopic cutter means and the ring support means, and when excavating by the cutter disc structure, the telescopic cutter means is in an extended state. When a part of the telescopic cutter means is fitted in a corresponding fitting recess of the outer peripheral ring, while the penetrating ring is interposed between the cutter disc structure and the outer peripheral ring, The telescopic cutter means is held in a contracted state, the fitting between the telescopic cutter means and the corresponding fitting recess of the outer peripheral ring is released, and a part of the ring support means corresponds to the outer peripheral ring. The shield machine according to claim 1, wherein the shield machine is fitted in the fitting recess.