JP3716023B2 - Tunnel excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tunnel excavator (such as a shield excavator, a tunnel boring machine, or a shaft excavator) that takes a propulsive reaction force against an inner wall surface of an existing lining material, and the propulsion reaction force is covered with an equal pressure. It can be made to act on the inner wall surface of the work material.
[0002]
[Prior art]
A shield excavator that improved excavation capability by excavating the ground and assembling the segments in parallel (simultaneous construction) was developed by the applicant of the present application and previously filed (Japanese Patent Application No. 6-253390). . Although the detailed configuration will be described later together with an embodiment of the present invention, an outline of this type of shield excavator will be described. In this type of shield excavator, a reaction force portion is provided in a reaction force transmission pipe extending from the rear trunk portion toward the rear of the tunnel, and a gripper is provided in the reaction force portion. When supporting the reaction force, the gripper protrudes in the radial direction, and the gripper engages with a segment recess (groove) formed in the inner peripheral surface of the existing segment. The reaction force is supported by the engagement between the gripper and the segment recess . In this way, when supporting the reaction force, excavation and segment lining are performed in parallel.
[0003]
[Problems to be solved by the invention]
By the way, in the above prior art, it is difficult to make the gripper and the segment concave portion uniformly contact over the entire surface in the circumferential direction, and there is a possibility that stable excavation may be prevented. In addition, if the contact is uneven, segment breakage may occur due to excessive contact force. Such a situation is likely to occur when the excavator swings somewhat due to fluctuations in the reaction force (thrust, rotational force, etc.) at the face during excavation.
[0004]
An object of the present invention is to provide a tunnel excavator capable of evenly bringing a gripper into contact with a groove on an inner circumferential surface of an existing lining material that is not very accurate like a segment recess , in view of the above-described prior art. To do.
[0005]
[Means for Solving the Problems]
The configuration of the present invention that achieves the above object includes a front torso having a cutter head at the tip, a rear torso connected to the front torso via a front torso jack and a rear torso jack at the rear, Engages with a reaction force transmission pipe extending from the trunk toward the rear of the tunnel and a groove formed on the inner peripheral surface of the existing lining material by projecting in a radial direction from a reaction force portion provided in the reaction force transmission pipe A tunnel excavator comprising a gripper,
A position to be engaged with the front Kimizo of the gripper, characterized in that it comprises a pressure equalizing device encapsulating fluid in the hollow portion of the interior.
[0006]
The configuration of the present invention, the gripper is more equipped to a position engaging the front Kimizo of each gripper, characterized in that the pressure equalizing device comprising, respectively.
[0007]
The configuration of the present invention, the gripper is more equipped to a position engaging the front Kimizo of each gripper, each comprise the pressure equalization device, by connecting the tube to the hollow portion to each other of KakuHitoshi圧device It is connected.
[0008]
The configuration of the present invention is characterized in that a relief valve is provided for discharging the fluid to the outside of the hollow portion when the pressure of the fluid sealed in the hollow portion is equal to or higher than a predetermined allowable pressure.
[0009]
In the present invention, since the elastic body is deformed when the gripper engages with the groove on the inner peripheral surface of the existing lining material, the contact pressure between the gripper and the groove becomes uniform over the entire circumference.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings.
[0011]
FIG. 1 is a block diagram showing a shield excavator according to a first embodiment of the present invention, and FIG. 2 is a perspective view showing a partially broken first embodiment. This shield excavator is a shield excavator that takes a propulsive reaction force against the inner wall surface of a segment.
[0012]
As shown in FIGS. 1 and 2, the front drum 2 having the cutter head 1 provided with the cutter and the rear drum 3 are connected by a front drum jack 4. A rear trunk jack 5 is attached to the rear trunk 3. Further, a reaction force transmission tube / erector swivel shaft 8 extends rearward from the rear barrel 3 and a reaction force portion 9 at the rear end of the reaction force transmission tube / erector swivel shaft 8 is provided with a gripper 10. . A plurality of grippers 10 (four in this example) are provided, and can extend radially from the reaction force portion 9 in the radial direction.
[0013]
An erector 12 is mounted on the reaction force transmission tube / erector turning shaft 8, and the segment 6 supplied by the segment supply device 7 is conveyed and covered by the erector 12 and assembled as a tunnel. A segment concave portion (groove) 15 a and a segment convex portion 15 for receiving a reaction force are provided on the inner peripheral wall of the segment 6. Reference numeral 11 denotes a perfect circle holding device.
[0014]
Also as shown in FIG. 3, the peripheral surface of each gripper 10 is formed with a ring-shaped gripper recess 10a extending in the circumferential direction, the gripper recess 10a has a concave shape in which the segment projection 15 is fitted It has become. An elastic body 13 as a pressure equalizing device is attached to a portion of the gripper recess 10a that engages with the segment recess 15a . The elastic body 13 has a hollow portion 16, and the hollow portion 16 is filled with a fluid such as oil.
[0015]
Further, as shown in FIG. 4, the hollow portions 16 of the four elastic bodies 13 are connected by a connecting pipe 14 to form the same system. A pressure gauge 17 and a relief valve 18 are provided in the system of the hollow portion 16 and the connecting pipe 14 that are in the same system.
[0016]
Here, the operation of the first embodiment having the above-described configuration will be described. In this type of shield excavator, as described in the previously filed Japanese Patent Application No. 6-253390, the rear trunk jack 5 is pressed against the end face of the assembled segment 6, and the front trunk jack 4 While digging with the cutter head 1, several of the rear trunk jacks 5 are contracted in order, and the segments 6 are sequentially assembled by the erector 12 in the contracted space. For this reason, excavation of the natural ground and the assembly work of the segment 6 can be performed in parallel (simultaneous construction), and the construction efficiency is remarkably improved. When several of the rear trunk jacks 5 are contracted, the gripper 10 of the reaction force portion 9 is extended, and the gripper 10 supports the reaction force by engaging with the segment recess 15a of the assembled segmento 6. .
[0017]
When the gripper 10 is engaged with the segment recess 15a , the size of the gap formed between the gripper 10 and the segment 6 varies depending on the location as shown in FIG. 5, for example, the gap size at a certain location is δ1, The gap size at other locations is δ2.
[0018]
When the gripper 10 is pressed against the segment recess 15a , the elastic body 13 is deformed according to the gaps at the respective locations. The elastic body 13 is easily deformed due to the hollow portion 16 therein. Moreover, since each hollow part 16 is connected by the connection pipe 14, even if the deformation amount of each elastic body 13 differs, the pressure of the fluid in each hollow part 16 becomes equal. Since the elastic body 13 arranged along the circumferential direction in this way deforms and follows in accordance with the gaps between the respective parts, the gripper 10 and the segment concave part 15a come into contact with each other substantially evenly without causing any contact, and thrust is applied. Can communicate. Therefore, stable excavation can be performed and the segment 6 is not damaged.
[0019]
In addition, if the limit contact pressure that can be withstood by the segment 6 is determined and the set pressure of the relief valve 18 is set to the limit contact pressure, the fluid confined in the hollow portion 16 can be relieved even when the thrust becomes abnormally large. Therefore, occurrence of breakage can be prevented.
[0020]
Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the hollow portions 16 of the four elastic bodies 13 provided in the gripper 10 are independent without being connected. Each hollow portion 16 is filled with a fluid at a confining pressure that balances the thrust, and each hollow portion 16 is provided with a pressure gauge 17 and a relief valve 18, respectively. The structure of the other parts is the same as in the first embodiment.
[0021]
In the second embodiment, by setting the confinement pressure of the fluid sealed in the hollow portion 16 and the relief pressure of the relief valve 18, a contact pressure balanced with the thrust can be obtained. Further, as in the first embodiment, the thrust can be transmitted evenly by contacting.
[0022]
Next, an elastic body 13, which is a pressure equalizing device, used in the third embodiment of the present invention is shown in FIG. The elastic body 13 is coupled to the gripper 10 via a mounting bracket 19. Then, the pressurized fluid is made to enter and leave the hollow portion 16 of the elastic body 13 through the pressurizing port 20 formed in the mounting bracket 19.
Since the periphery of the elastic body 13 is covered with the surface of the gripper 10 and the groove side surface of the segment recess 15a , the fluid pressure inside the hollow portion 16 can be extremely increased.
[0023]
In consideration of the ease with which the gripper 10 can be taken in and out, the taper angle of the groove of the segment recess 15a is set to 20 ° ± 5 °.
[0024]
【The invention's effect】
According to the present invention as specifically described with above embodiments, since with a pressure equalizing device in a portion which engages in a groove (segment recess) already設覆Industrial Materials inner wall surface of the gripper, the gripper and lining Contact with the material evenly, smooth transmission of thrust is possible, and stable excavation is possible.
[0025]
In addition, since the pressure equalizing device is provided, the existing lining material does not come into contact with each other, and the lining material can be prevented from being damaged by the contact.
[0026]
Further, the use of the relief valve can prevent the lining material from being damaged even when the thrust force becomes abnormally large.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a shield excavator according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing the shield excavator of the first embodiment with a part broken away.
FIG. 3 is a cross-sectional view showing a pressure equalizing device (elastic body) provided in the first embodiment.
FIG. 4 is a configuration diagram showing the main part of the first embodiment.
FIG. 5 is an explanatory view showing a gap state between a gripper and a segment.
FIG. 6 is a configuration diagram showing a main part of a shield excavator according to a second embodiment of the present invention.
FIG. 7 is a cross-sectional view showing a pressure equalizing device (elastic body) of a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cutter head 2 Front cylinder 3 Rear cylinder 4 Front trunk part jack 5 Rear trunk part jack 6 Segment 7 Segment supply apparatus 8 Reaction force transmission pipe and elector turning shaft 9 Reaction force part 10 Gripper 10a Gripper recessed part 11 Perfect circle holding apparatus 12 Elector 13 Elastic body (equalizing device)
14 Connecting pipe 15 Segment convex part
15a Segment recess (groove)
16 Hollow part 17 Pressure gauge 18 Relief valve 19 Mounting bracket 20 Pressure port

Claims (4)

A front torso with a cutter head at the tip, a rear torso connected to the front torso via a front torso jack and a rear torso jack at the rear, and reaction force transmission extending from the rear to the rear of the tunnel In a tunnel excavator provided with a pipe and a gripper engaged with a groove formed in an inner peripheral surface of an existing lining material by projecting in a radial direction from a reaction force portion provided in the reaction force transmission pipe ,
A position to be engaged with the front Kimizo of the gripper, tunneling machine, characterized in that it comprises a pressure equalizing device encapsulating fluid in the hollow portion of the interior. The gripper has a plurality of equipment, in a position to engage the front Kimizo of each gripper, the tunnel boring machine according to claim 1, characterized in that the pressure equalizing device comprising, respectively. The gripper has a plurality of equipment, in a position to engage the front Kimizo of each gripper, each comprise the pressure equalization device, characterized in that the hollow portion each other of KakuHitoshi圧device were connected by connection tube The tunnel excavator according to claim 1.   4. The relief valve according to claim 1, further comprising a relief valve that discharges the fluid to the outside of the hollow portion when the pressure of the fluid sealed in the hollow portion exceeds a predetermined allowable pressure. Tunnel excavator.

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