JP2002138788A - Shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield machine in which any damage of a part in the vicinity of an edge of an assembled segment is eliminated, and construction can be smoothly promoted without any delay. SOLUTION: This shield machine is constituted by connecting a plurality of body parts 1, 10, 20 and 30 having a skin plate 41, and provided with a cutter head 4 for excavating the full section on a forward end thereof, and the segment 40 is assembled within the body part 30 at a rear end thereof. Main grippers 22 and 22 which are protruded from an outer circumferential surface of the body part 20 and pressed against a side wall of a shaft are provided in a retractable manner on the other body part 20 except the body part 1 having the cutter head 4, and the jacking reaction of the cutter head 4 is received by the side wall of the shaft via the main grippers 22 and 22 to eliminate the load on the segment which has been applied thereto during the excavation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine used in a tunnel construction site by a shield tunnel construction method, and more particularly, to a method of assembling and lining a tunnel section in segments together with excavation of the entire section. And a shield machine for excavating the entire cross section.

[0002]

2. Description of the Related Art FIG. 6 schematically shows an example of a conventional three-body full-section excavation shield machine having a skin plate and used at a construction site by a shield tunnel construction method. A front body 51 having a front body 51 and a middle body 5 to which a shield jack 52 for propelling a shield machine is fixed and connected to the front body 51 via a folding device 53
4 and a segment 5 connected to the middle body 54
8 and a rear body portion 57 in which a pressure contact device 55 provided on a ram 56 of the shield jack 52 expands and contracts.

In the above-mentioned conventional shield machine, the excavation of the shield machine is performed by using a ring-shaped press-contact device 55 provided at the end of the ram 56 of the shield jack 52 on the edge 58a of the assembled leading-edge segment 58. Abut, ram 5
When the cutter 6 is extended, the segment 58 moves forward with a reaction force applied to the segment 58. Excavation of a face by the cutter head 50 is performed with the propulsion force generated by the reaction force.

Then, the excavation proceeds and the shield jack 52
When the ram 56 is extended, the ram 56 is contracted to
After the ram 56 is retracted, the segments 58 are assembled into a tube shape in the rear body 57 to form a tunnel cross section, and the assembled segments 58 are again connected to the assembled segments 58 via the press-contact device 55. The excavation is continued by repeating the propulsion of the shield machine by taking a reaction force.

[0005]

In the above-mentioned conventional shield machine using the segment 58 as a lining material,
Since the propulsion force at the time of excavation is obtained by applying a reaction force to the segment 58, a large load is applied to the edge 58a of the assembled segment 58 with which the pressure welding device 55 contacts, and the critical load and vibration during excavation cause Edge 58 of 58
a may be damaged.

In particular, when excavating a curve forming a curve or gradient in a tunnel, an eccentric load is applied to one side of the edge 58a of the segment 58, and the load is concentrated and the portion subjected to the critical load is damaged, and the damaged portion is damaged. The work was congested due to the repairs.

Further, since the propulsion reaction force is applied to the segment 58 by extending the shield jack 52, a new segment cannot be assembled at the tail portion during excavation propulsion, resulting in poor work efficiency.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to eliminate breakage near an edge of an assembled segment so that construction can be efficiently and smoothly promoted without congestion.

[0009]

SUMMARY OF THE INVENTION The present invention comprises a plurality of barrels having skin plates connected to each other, and has a cutter head for excavating a full cross section at the tip and assembling of segments in the barrel at the rear end. In the shield machine to be performed, a main gripper that protrudes from the outer peripheral surface of the trunk and presses against the side wall of the pit is provided on at least one trunk except the trunk with the cutter head so that the main gripper can come and go, and through the main gripper. By taking the propulsion reaction force of the cutter head on the side wall of the pit,
The load on the segment that was conventionally applied during excavation has been eliminated.

[0010] Also, the shield machine includes a first body having a cutter head and a front gripper, a second body fixed with a direction correcting jack connected to the first body, and the direction correcting jack. A propulsion jack connected to the second body is fixed via the third body, and a third body provided with a pair of main grippers, and a shield jack provided with a press-contact device abutting on the segment are fixed and the center folding jack is used. And the fourth torso connected to the third torso eliminates the load on the segment during excavation and enables the assembly of the segment during excavation,
In addition, the propulsion of the moving trunk can be performed quickly by interlocking and using the propulsion jack and the shield jack.

Further, since the main gripper is provided so as to be swingable, the main gripper is pressed into contact with the inclined surface or the curved surface of the side wall of the shaft, and the load is received by the wide area surface of the gripper frame. Made it easier for the main gripper axis.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1 to 5 show a shield machine according to the present invention. The shield machine includes a first body 1 having a cutter head 4 and a pair of front grippers 3, 3, and is connected to the first body. A second body portion 10 to which a direction correcting jack 11 to be fixed is fixed, and a propulsion jack 21 connected to the second body portion 10 via the direction correcting jack 11 are fixed, and a pair of main grippers 22, 22 are provided. A third trunk 20,
Pressing device 32 for pressing against assembled segment 40
The fourth body part 3 to which the shield jack 33 provided with is fixed and which is connected to the third body part 20 through the center folding jack 31
0, and each trunk 1, 10, 20, 30
Are skin plates (outer shell steel plates) 41a, 41b, 41
A frame is formed by c and 41d. A belt conveyor (not shown) for shear discharge is disposed at the center of the first body part 1, the second body part 10, and the third body part 20 through the body parts 1, 10, and 20.

The first body 1 of the shield machine in the present embodiment is a cutting machine 2 including a cutter head 4 positioned at the foremost end and hitting a cutting face, and a turning speed reducer 5 for driving the cutter head 4. have. Also, the first
The front grippers 3, 3 mounted in the body 1 are arranged in a pair with the body axis interposed therebetween. The front grippers 3, 6 are driven by the front gripper jacks 6, 6 so that the front grippers 3, 3 can be freely protruded and retracted from the outer peripheral surface of the body. When the third trunk 20 and the fourth trunk 30 are propelled, they protrude from the outer peripheral surface of the trunk and are brought into pressure contact with the side wall of the pit to take a propulsion reaction force.

The second body 10 is provided with pedestals 12 at four locations on the inner peripheral surface thereof. Each pedestal 12 is provided with a direction-correcting jack 11 that extends into the first body 10 and is pivotally supported. . The tip of the ram 13 of the direction correcting jack 11 is pivotally attached to the pedestal 7 of the first body 1, and the first body 1 is variably connected to the second body 10 via the direction correcting jack 11 in the traveling direction. Have been.

A propulsion jack 21 pivotally supported by a pedestal 23 is provided on the third body 20 at a position corresponding to the direction correcting jack 11 of the second body 10 so as to extend into the second body 10. ing. The tip of the ram 24 of the propulsion jack 21 is pivotally attached to the pedestal 12 of the direction correcting jack 10 of the second body 10, and the second body 10 is propulsively connected to the third body 20 by the propulsion jack 21. Have been.

As shown in FIG. 3, the main grippers 22, 22 mounted in the third body portion 20 include main gripper jacks 25, 25 and the end faces of rams 25a of the main gripper jacks 25, 25. And a gripper frame 26 fixed by bolts 27 to the main gripper jack 2.
Drives 5 and 25 make it possible to freely protrude and retract from the outer peripheral surface of the trunk. When the excavating mechanism 2 is operated to excavate and protrude, the main grippers 22 and 22 are projected from the outer peripheral surface of the trunk portion and pressed against the side wall of the pit, and the propulsion reaction force of the excavating mechanism is transmitted through the main grippers 22 and 22 to the pit. On the side wall.

The gripper frame 26 of the main gripper 22 is swingably loosely fitted in the mounting hole 20a of the third body 20, and the lower part of the main gripper jack 25 is loosely fitted in the support hole 15b of the fixed plate 15. A spacer plate in which the lower surface of the flange portion 25b of the main gripper jack 25 slidably abuts the upwardly curved surface 15a of the fixing plate 15 and the packing 16 provided on the outer periphery of the flange portion 25b is located on the upper surface of the fixing plate 15. The elastic plate 17 elastically contacts the inner peripheral surface of the
It is swingably supported above.

Main gripper 22 having the above configuration
Is swingable at a predetermined angle K in any direction with respect to its own axis. Accordingly, even when the side wall of the pit with which the main gripper 22 contacts has an inclined surface or a curved surface, the main gripper 22 is pressed into contact with the inclined surface or the curved surface so that the load applied to the main gripper 22 is reduced. 26, and the load is easily applied to the axis of the main gripper 22.
Therefore, it is possible to reduce the unbalanced load applied to the center of the gripper frame 26 due to the inclined surface or the curved surface of the side wall of the shaft, and the center of the gripper frame 26 fixed by the bolt 27 is damaged by the unbalanced load. Can be avoided.

The number of the main grippers 22 is not limited to the illustrated pair, and a plurality of main grippers 22 may be provided. Also,
The shape of the gripper frame 26 in the main gripper 22 is not limited to the illustrated cylindrical shape but may be a square shape or an elliptical shape. The contact surface 22a of the main gripper 22 to the side wall of the shaft is preferably an uneven surface or a lattice-like surface in order to increase frictional resistance (not shown).

The fourth body 30 is connected to the third body 20 so as to be bendable via four center folding jacks 31 extending into the third body 20. The third trunk 2 is located on the inner peripheral surface of the fourth trunk 30 adjacent to the center folding jack 31.
The shield jack 33 is fixedly extended to the inside. A ring-shaped pressure contact device 32 is attached to the tip of the ram 34 of the shield jack 33, and the pressure contact device 32 abuts on the edge 40a of the segment 40 assembled by the expansion and contraction of the ram 34 toward the rear of the body.

The shield jack 3 with the press-contact device 32
3 is used when the third trunk portion 20 and the fourth trunk portion 30 are advanced in the cutting face direction during non-digging, and the ram 34 is extended and the pressing device 32 takes a reaction force on the segment 40 to take a reaction force. The third trunk 20 and the fourth trunk 30 are propelled.

In the shield machine according to the present embodiment configured as described above, when the cutter head 4 excavates and advances,
The front grippers 3, 3 are housed in the body 1 flush with the skin plate 41a to release the fixing of the first body 1 to the wellbore, and the main gripper jack 25 of the third body 20 25, and the main grippers 22, 22
Is projected from the skin plate 41c constituting the outer peripheral surface of the trunk, and is pressed against the side wall of the pit to fix the third trunk 20 to the pit wall.

In the above state, the excavating mechanism 2 is driven to rotate the cutter head 4 and the propulsion jack 21 is driven to extend the ram 24, and a reaction force is applied to the side wall of the pit via the main grippers 22, 22. The first body 1 and the second body 10
Excavate while moving forward. The excavation direction is corrected by driving the direction correcting jack 11.

During the excavation operation in which the cutter head 4 advances,
The load from the propulsion jack 21 for moving the cutter head 4 forward is applied to the third body 20 having the main grippers 22 and 22. Therefore, the fourth trunk portion 30 serving as the tail portion is in a free state, and the shield jack 33 is contracted and the pressing device 32 is drawn toward the third trunk portion 20 so that the segment can be assembled in the fourth trunk portion 30. A work space can be secured (see FIG. 1).

Accordingly, while the excavation work is proceeding, the assembly work of the segment fed as the lining material for connecting to the already assembled segment 40 in the fourth trunk portion 30 can be performed.

As is apparent from the above description, the present embodiment has a configuration in which the load for propelling the cutter head 4 and the vibration during excavation during the excavation work do not directly reach the segment 40. Unlike the conventional case, the edge 40a of the segment 40 does not receive a critical load.

When the ram 24 of the propulsion jack 21 is completely extended and the excavation is completed, and the third body portion 20 and the fourth body portion 30 are advanced in preparation for the next excavation, the front grippers 3, 3 are first protruded. Then, the first trunk 1 is fixed to the pit wall by pressing against the side wall of the pit, and the main grippers 22, 22 are loosened to release the fixing of the third trunk.

Next, when the propulsion jack 21 is contracted and the third trunk portion 20 and the fourth trunk portion 30 are pulled forward by the compressive force of the propulsion jack 21 and the segments 40 are assembled, FIG. As shown, shield jack 3
The ram 34 of the third unit is extended to connect the press-connecting device 33 to the segment 40.
And the ram 34 expands the ram 34 to take a reaction force on the segment 40, and cooperates with the propulsion jack 21 to propel the third trunk portion 20 and the fourth trunk portion 30.

When the shield jack 33 cannot be used due to the work in the tail portion of the shield machine or the like, the propulsion jack 21 is simply contracted to allow the third trunk portion 20 and the fourth trunk portion 3 to be used.
It is also possible to draw 0.

Further, when the fixed body portions 1, 20 by the front grippers 3, 3 are insufficiently fixed due to the condition of the excavated ground or the like, or when the third body portion 20, the fourth body 4 If the torso 30 is difficult to attract, the third
The trunk 20 and the fourth trunk 30 can also be propelled.

Therefore, in the present embodiment, the third trunk portion 20 and the fourth trunk portion 30 can be smoothly propelled while coping with various situations associated with excavation. Even when the third trunk portion 20 and the fourth trunk portion 30 are propelled only by the shield jack 33, only the load necessary for propulsion of the third trunk portion 20 and the fourth trunk portion 30 is applied to the segment 40. Since a large load such as to advance the cutter head 4 toward the cutting face is not applied, the segment 40 is not damaged by the critical load.

[0033]

The present invention is embodied in the form described above and has the following effects.

A main gripper that protrudes from the outer peripheral surface of the body and presses against the side wall of the pit is provided on the body provided with a propulsion jack for propelling the cutter head so that the main gripper can come and go. Since the propulsion reaction force is taken, unlike the conventional shield machine, the propulsion reaction force is not taken in the assembled segment, so that the segment can be prevented from being damaged and the segment can be assembled even during excavation.

Therefore, both the time and cost required for repairing the segment can be reduced, and the work efficiency can be significantly improved.

In addition, by employing a configuration including a propulsion jack and a shield jack, it is possible to cope with various situations associated with excavation work by cooperating or selectively using the propulsion jack and the shield jack. , The third and fourth trunks can be promptly propelled.

Further, since the main gripper can be swung, the damage of the gripper frame can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a shield machine of the present invention.

FIG. 2 is an enlarged sectional view showing the direction of arrow AA in FIG. 1;

FIG. 3 is an enlarged cross-sectional view showing the direction of arrow BB in FIG. 1;

FIG. 4 is an enlarged sectional view showing the direction of the arrows CC in FIG. 1;

FIG. 5 is a sectional view showing an operating state of the shield machine of FIG. 1;

FIG. 6 is a sectional view schematically showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st trunk | drum, 3, 3 front grippers, 4 cutter heads, 10 2nd trunk | drum, 11 direction correction jacks, 2
0 3rd trunk, 21 propulsion jack, 22, 22 main gripper, 30 4th trunk, 31 Half-fold jack, 3
2 pressure welding device, 33 shield jack, 40 segments, 41a, 41b, 41c, 41d skin plate,

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norio Kashimura 2-28 Asahimachi, Omuta-shi, Fukuoka Pref. Inside Miike Works, Mitsui Miike Works Co., Ltd. (72) Inventor Kiyoto Orihara 2-chome Asahicho, Omuta-shi, Fukuoka No. 28 F-term (reference) 2D054 AC02 AD02 AD16 AD35 in Mitsui Miike Works, Miike Works

Claims (3)

[Claims] 1. A shield machine comprising a plurality of body portions having skin plates connected to each other and having a cutter head for excavating the entire cross section at the tip and assembling segments in the body portion at the rear end. A shield machine characterized in that a main gripper protruding from an outer peripheral surface of the trunk and being pressed against a side wall of a pit is provided on at least one trunk except a trunk provided with a main body so that the main gripper can come and go. 2. A first body having a cutter head and having a front gripper; a second body fixed with a direction correcting jack connected to the first body; and the direction correcting jack. A third in which a propulsion jack connected to the second body is fixed and a pair of main grippers are provided.
A body portion and a shield jack provided with a press-contact device abutting on the segment are fixed, and the third jack is inserted through the center jack.
A shield machine comprising a body and a fourth body connected to the body. 3. The shield machine according to claim 1, wherein the main gripper is swingably provided.