JP7245714B2 - Tunnel excavator and tunnel excavation method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tunnel excavator and a tunnel excavation method for suppressing vibration generated when excavating ground.

A general tunnel excavator can excavate a tunnel by rotating a cutter head and forming a face on the ground ahead with a plurality of cutters attached to the front surface of the cutter head.

At this time, if the ground to be excavated is hard ground such as bedrock, large vibrations are generated in the cutter head and the excavator main body. This vibration is transmitted through the ground and may cause vibration damage to surrounding areas such as houses and underground facilities on the ground surface.

Therefore, for example, in Patent Document 1 below, a plurality of vibration exciters are provided in a tunnel excavator, and these vibration exciters are driven to output vibration in the opposite phase to the vibration generated in the cutter head and the excavator main body. This cancels out and suppresses vibrations generated in the cutter head and the excavator body.

JP 2015-155597 A JP 2017-172162 A

However, in the tunnel excavator as disclosed in Patent Document 1, the surface on which the vibration exciter is installed is the same as the surface on which the vibration exciter imparts anti-phase vibration. Even if it is output, the vibration exciter itself will vibrate, and the output anti-phase vibration cannot be properly transmitted to the cutter head or excavator body, and the generated vibration cannot be sufficiently transmitted. It may not be possible to suppress it.

Therefore, the above-mentioned Patent Document 2 discloses a tunnel excavator that prevents vibration damage to the surrounding area by suppressing the vibration generated in the cutter head during excavation using a damping jack with both ends fixed. ing.

However, in Patent Document 2, the directional control jack provided along the outer periphery of the excavator body is also used as a vibration damping jack, and this directional control jack and vibration damping jack is used in the axial direction of the excavator body. Since it is provided at the boundary between the front body and the rear body, the technique of Patent Document 2 cannot be applied to a tunnel excavator having a structure in which the body of the excavator is not divided into the front body and the rear body.

SUMMARY OF THE INVENTION In view of the above technical problem, an object of the present invention is to provide a tunnel excavator and a tunnel excavation method capable of reliably damping vibrations regardless of the structure of the excavator body.

A tunnel excavator according to a first invention for solving the above problems,
a cylindrical excavator body, a cutter head for excavating the ground at the front end of the excavator body;
A tunnel excavator comprising an erector device that can assemble a lining member along the inner wall surface of an excavated tunnel behind the excavator main body,
an extendable propulsion jack, one end of which is fixed at an arbitrary position among the excavator body and members fixed to the excavator body, and the other end of which is capable of pressing the existing lining member;
a measuring means for measuring vibrations generated in the excavator body;
The propulsion jack is subjected to expansion/contraction control for advancing the excavator body, and based on the measurement result of the measuring means, an anti-phase vibration that is in the opposite phase to the phase of the vibration generated in the excavator body is output. and a control means for performing expansion and contraction control ,
The propulsion jack generates the anti-phase vibration while the other end of the jack presses the existing lining member.
It is characterized by

A tunnel excavator according to a second invention for solving the above problems,
In the tunnel excavator according to the first invention,
The propulsion jacks are plural and divided into a plurality of groups of a predetermined number,
The measuring means are provided at positions corresponding to the groups,
The control means controls the propulsion jacks for each group based on the measurement result of the measurement means.

A tunnel excavator according to a third invention for solving the above problems,
A cylindrical excavator body, a cutter head that excavates the ground at the front end of the excavator body, and an erector that can assemble a lining member along the inner wall surface of the excavated tunnel at the rear of the excavator body. A tunnel boring machine comprising:
An extendable jack for propulsion, one end of which can press the existing lining member, and one end of which is fixed at an arbitrary position among the excavator body and a member fixed to the excavator body, a jack device, each comprising a retractable damping jack, the other end of which is fixed to the other end of the propelling jack;
a measuring means for measuring vibrations generated in the excavator body;
The propulsion jack is stretched and contracted to move the excavator body forward, and the damping jack is controlled based on the measurement result of the measuring means to control the phase of the vibration generated in the excavator body. and control means for performing expansion/contraction control for outputting antiphase vibration.

A tunnel excavator according to a fourth invention for solving the above problems,
In the tunnel excavator according to the third invention,
The jack device is plural and divided into a plurality of groups of a predetermined number,
The measuring means are provided at positions corresponding to the groups,
The control means controls the damping jacks for each group based on the measurement result of the measurement means.

A tunnel excavation method according to a fifth invention for solving the above problems,
a cylindrical excavator body, a cutter head for excavating the ground at the front end of the excavator body;
A tunnel excavation method using a tunnel excavator including an erector device that can assemble a lining member along the inner wall surface of an excavated tunnel behind the excavator main body,
The tunnel excavator further has one end fixed to an arbitrary position among the excavator body and a member fixed to the excavator body, and the other end capable of pressing the existing lining member. having a retractable propulsion jack,
The propulsion jack is stretched and contracted to move the excavator body forward, measures the vibration generated in the excavator body, and outputs antiphase vibration that is in the opposite phase to the phase of the vibration. Perform expansion and contraction control,
The propulsion jack generates the anti-phase vibration while the other end of the jack presses the existing lining member.
It is characterized by

A tunnel excavation method according to a sixth invention for solving the above problems,
A cylindrical excavator body, a cutter head that excavates the ground at the front end of the excavator body, and an erector that can assemble a lining member along the inner wall surface of the excavated tunnel at the rear of the excavator body. A tunnel excavation method using a tunnel excavator comprising a device,
The tunnel excavator further includes a telescopic jack for propelling one end of which can press the existing lining member, and one end of the excavator main body and a member fixed to the excavator main body. , each comprising a retractable damping jack fixed at an arbitrary position and the other end fixed to the other end of the propulsion jack,
The propulsion jack is stretched and contracted to move the excavator body forward, the vibration generated in the excavator body is measured, and the damping jack is controlled to have a phase opposite to the phase of the vibration. It is characterized in that expansion and contraction control is performed so as to output an antiphase vibration of

According to the tunnel excavator and the tunnel excavation method according to the present invention, it is possible to reliably damp vibrations regardless of the structure of the excavator main body.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic cross-sectional view explaining the tunnel excavator which concerns on Example 1 of this invention. It is an enlarged cross-sectional arrow line view explaining the propelling jack in Example 2 of this invention. It is an expanded cross-sectional view explaining the other form of the propulsion jack in Example 2 of this invention. It is an enlarged cross-sectional arrow view explaining the propelling jack in Example 3 of this invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a tunnel excavator and a tunnel excavation method according to the present invention will be described with reference to the drawings. The expressions "front" and "rear" in the following examples refer to "front" and "rear" with respect to the orientation of the tunnel excavator in the tunnel extension direction.

[Example 1]
FIG. 1 is a schematic cross-sectional view illustrating a tunnel excavator (tunnel excavator 1) according to this embodiment. As shown in FIG. 1 , the tunnel excavator 1 mainly includes a cylindrical excavator main body 10 and a disk-shaped cutter head 11 .

The cutter head 11 is provided at the front end of the cylindrical excavator body 10 . Further, the front end of the cutter rotating shaft 11a is fitted in the center of the cutter head 11. As shown in FIG.

A partition wall 12 is arranged on the inner peripheral surface 10 a of the excavator main body 10 on the rear side of the cutter head 11 . A cutter rotating shaft 11a is rotatably supported at the center of the partition 12, and a connecting member 11b is rotatably supported on the outer peripheral side thereof. .

By driving the cutter turning motor 13, the cutter head 11 can be rotated around the cutter rotating shaft 11a via a gear mechanism and a connecting member 11b (not shown) to excavate the ground (face).

A chamber 14 is defined between the cutter head 11 and the partition wall 12 . The chamber 14 is a space (chamber) for temporarily storing excavated earth and sand, and the excavated earth and sand generated as the cutter head 11 excavates the ground is taken into the chamber 14 .

A screw conveyor 15 is provided inside the excavator main body 10 . The opening at the front end of the screw conveyor 15 is inserted into the chamber 14 through the lower position (in the vertical direction) of the partition wall 12, and is positioned toward the rear side (in the upper direction in the vertical direction). placed at an angle.

Thus, by driving the screw conveyor 15, the excavated earth and sand stored in the chamber 14 can be discharged toward the rear of the excavator main body 10. As shown in FIG.

Furthermore, a beam 18 is provided on the inner peripheral surface 10a of the excavator main body 10 behind the partition wall 12 of the excavator main body 10, and is arranged, for example, in a substantially grid pattern.

An erector device 19 is supported on the rear surface of the beam 18 so as to be movable in the axial direction, radial direction and circumferential direction of the excavator body 10 (that is, tunnel extension direction, radial direction and circumferential direction). The erector device 19 can hold a segment S as a lining member, and can assemble the held segment S along the inner wall surface of the tunnel T (pit wall).

The segment S is an annular piece having a shape corresponding to the inner wall surface of the excavated tunnel T. As shown in FIG. Therefore, by driving the erector device 19, a plurality of segments S can be assembled in a ring shape along the tunnel circumferential direction.

In addition, a plurality of propulsion jacks 20 are arranged side by side along the inner peripheral surface 10a of the excavator main body 10 at predetermined intervals in the circumferential direction. The operation of these propulsion jacks 20 is controlled by a control device 21, which will be described later.

Further, the excavator main body 10 has an annular member 23 that protrudes radially inward from the inner peripheral surface 10a and is fixed to the bulkhead 12 from the rear side. It is fixed to the rear surface of the annular member 23 . Furthermore, the rear end of the propulsion jack 20 can press on an existing segment S (already installed by the erector device 19).

At the rear end of the propelling jack 20, the driving rod 20b is extendable in the tunnel extension direction, and a spreader 20a is attached to the tip of the driving rod 20b. The spreader 20a faces the front end face of the existing segment S. As shown in FIG.

Therefore, by extending the drive rod 20b of the propulsion jack 20 toward the rear side and pressing the spreader 20a against the existing segment S, a propulsion reaction force is applied to the excavator main body 10 via the annular member 23. be able to. That is, the excavator main body 10 can move forward by the propulsion reaction force generated when the propulsion jack 20 presses the segment S. As shown in FIG.

Further, the propulsion jack 20 can generate vibration by repeatedly extending and contracting the driving rod 20b in small steps. The vibration generated by the slight expansion and contraction of the propulsion jack 20 is an anti-phase vibration that is in opposite phase to the vibration generated in the cutter head 11 during excavation of the ground.

As already explained, since the annular member 23 is fixed to the inner peripheral surface 10a of the excavator main body 10, the opposite phase vibration caused by the propulsion jack 20 interferes with the vibration generated in the excavator main body 10. The vibration can be suppressed. Further, since the propulsion jack 20 generates the opposite phase vibration with its rear end pressing the segment S, it is possible to suppress vibration more effectively than the technique disclosed in Patent Document 1. Further, the technique disclosed in Patent Document 2 can be applied only to a structure in which the excavator body is divided into a front body and a rear body. can be applied to structures that are not divided into

The generation of the propulsion reaction force of the propulsion jack 20 and the generation of the antiphase vibration are performed simultaneously. In other words, the anti-phase vibration is a very small stroke and does not hinder the movement of the propulsion reaction force, which is a smooth and continuous movement with a large stroke, so both can be generated at the same time.

However, since the propulsion jack 20 only needs to be able to transmit the propulsion reaction force and the anti-phase vibration to the excavator body 10, it is not limited to the annular member 23, and is fixed to the excavator body 10 and the excavator body 10. It may be fixed at an arbitrary position among the members.

A vibration measuring device (measuring means) 22 is arranged on the annular member 23 . The vibration measuring instrument 22 measures vibration (waveform, period, and amplitude) generated in the excavator main body 10 .

However, the vibration measuring instrument 22 is not limited to the position described above, and may be placed anywhere as long as the vibration generated in the excavator main body 10 can be measured. Alternatively, the vibration measuring instruments 22 may be provided at positions corresponding to fixed positions of the front ends of the propulsion jacks 20 on the annular member 23 .

A control device (control means) 21 is provided in the excavator main body 10 . This control device 21 is electrically connected to a servo valve for supplying and discharging hydraulic pressure to and from the propulsion jack 20 and a vibration measuring device 22 .

By controlling the opening degree of the servo valve, the control device 21 controls the expansion and contraction of the excavator body 10 (by the propulsion reaction force caused by pressing the segment S) with respect to the propulsion jack 20. is performed, based on the measurement result of the vibration measuring device 22, the anti-phase vibration of the vibration generated in the excavator main body 10 is calculated, and expansion/contraction control is performed to output the anti-phase vibration.

Regarding the output of the anti-phase vibration, when the vibrations measured by the respective vibration measuring instruments 22 are input, the control device 21 analyzes the vibrations to identify the main component of the vibration generated in the excavator main body 10 . After specifying the vibration mode, a control signal for anti-phase vibration corresponding to the vibration mode is input to the servo valve of each propulsion jack 20 .
By controlling the opening degree of the servo valve, the control device 21 controls the expansion and contraction of the propulsion jack 20 to move the excavator body 10 forward, and reduces the vibration generated in the excavator body 10 . Anti-phase vibration is calculated and expansion and contraction control is performed to output the anti-phase vibration, but the expansion and contraction control for moving forward uses a large amount of oil in the control, but the fluctuation is small and the opposite-phase vibration is output. The expansion and contraction control has a markedly different characteristic that the amount of oil in the control is small but fluctuates greatly. , may be combined (combined) to control the propulsion jack 20 .

It should be noted that the object to which the control device 21 outputs the anti-phase vibration may be all the propulsion jacks 20 or some of the propulsion jacks 20 . In addition, since the vibration measuring device 22 is arranged at a position corresponding to the propulsion jacks 20 to which the control device 21 outputs the antiphase vibration, it is not necessarily arranged corresponding to all the propulsion jacks 20. do not have.

Vibration modes that actually occur in the excavator main body 10 mainly include vibration in the tunnel extension direction, and additionally, vibration in the tunnel radial direction (vertical direction and horizontal direction). In the control device 21, all of the propulsion jacks 20 may be collectively controlled. Based on the measurement result of the measuring device 22, each group may be controlled (anti-phase vibration).

As described above, when constructing a tunnel structure by the tunnel excavator 1 , first, while rotating the cutter head 11 , the plurality of propulsion jacks 20 are extended and pressed against the existing segment S. As a result, the excavator main body 10 moves forward by receiving a propulsion reaction force from the existing segment S, and the tunnel T is excavated by the rotating cutter head 11 .

At this time, the excavated earth and sand generated by the ground excavation is filled into the chamber 14 through the excavated earth and sand inlet of the cutter head 11, and the chamber 14 is filled with the excavated earth and sand to a predetermined level. Internal pressure is maintained. The excavated soil filled in the chamber 14 is discharged rearward by the rotation of the screw conveyor 15 .

At the same time, on the rear side of the shortened propulsion jack 20, the segments S held by the erector device 19 are sequentially assembled along the inner wall surface of the tunnel T in a ring shape.

That is, the amount of earth and sand corresponding to the amount of excavation by the cutter head 11 is smoothly discharged by the screw conveyor 15, and the chamber 14 is constantly filled with the excavated earth and sand, thereby stabilizing the face and opening the tunnel T. While excavating, the thrust jacks 20 are extended under the control of the control device 21, and a new segment S is assembled on the rear side of the shortened thrust jacks 20 while excavating by taking thrust reaction force from the existing segments S.

At the same time, when vibration of the excavator main body 10 is measured by the vibration measuring device 22, the control device 21 controls expansion and contraction of the propulsion jack 20 so that antiphase vibration corresponding to the magnitude of the measured vibration is generated. do.

That is, the control device 21 causes the propulsion jack 20 to generally extend to propel the tunnel excavator 1 , and more specifically to generate antiphase vibrations with respect to the vibrations generated in the excavator body 10 . Performs a slight expansion/contraction control.

The anti-phase vibration output by the propulsion jack 20 is transmitted to the excavator body 10, thereby interfering with the original vibration generated in the excavator body 10 and reducing the vibration.

At this time, by controlling the expansion and contraction of the propulsion jacks 20 for each group divided in the circumferential direction according to the vibration mode generated in the excavator body 10, the vibration generated in the excavator body 10 is an antiphase vibration. will be sufficiently suppressed by

[Example 2]
In the present embodiment, the propelling jack 20 is changed to a jack device 30 described later, and the control device 21 is changed to a control device 31 described later in the first embodiment. In the following, the parts different from the first embodiment will be mainly described, and overlapping parts will be omitted as much as possible.

As shown in the enlarged cross-sectional view of FIG. 2, the jack device (jack device 30) in this embodiment mainly includes a jack 32 for propelling and a jack 33 for damping vibration. The expansion and contraction of the damping jack 33 is controlled by a control device (control means) 31 . It should be noted that the installation position of the jack device 30 is the same as that of the propulsion jack 20 of the first embodiment.

The driving jack 32 has a front end surface fixed to a rear end surface of the damping jack 33, and the rear end side can press the existing segment S (see FIG. 1).

At the rear end of the propelling jack 32, a drive rod 32b is extendable in the tunnel extending direction, and a spreader 32a is attached to the tip of the drive rod 32b. The spreader 32a faces the front end face of the existing segment S. As shown in FIG.

The damping jack 33 has a rear end face fixed to the front end face of the propelling jack 32 as described above, and a front end face fixed to the rear face of the annular member 23 .

On the front end side of the damping jack 33, a drive rod 33b is slightly extendable in the tunnel extending direction, and a spreader 33a is attached to the tip of the drive rod 33b. This spreader 33 a is fixed to the rear surface of the annular member 23 .

However, as shown in FIG. 3, the damping jacks 33 may be arranged upside down.

In the jack device 30, the driving jack 32 and the damping jack 33 are configured as described above, so that the driving jack 32 first extends the drive rod 32b toward the rear side, and the spreader 32a is moved to the existing segment S A propulsive reaction force can be applied to the excavator main body 10 via the vibration damping jack 33 and the annular member 23 by pressing the excavator main body 10 to . That is, the excavator main body 10 can move forward by the propulsive reaction force generated when the propulsion jack 32 presses the segment S. As shown in FIG.

Also, the damping jack 33 can generate vibration by repeatedly expanding and contracting the driving rod 33b in small steps. The vibration generated by the slight expansion and contraction of the damping jack 33 is an anti-phase vibration that is opposite in phase to the vibration generated in the cutter head 11 during excavation of the ground.

The generation of the propulsive reaction force by the propelling jack 32 and the generation of the anti-phase vibration by the damping jack 33 are simultaneously performed under the control of the control device 31, which will be described later.

Further, the propulsion jack device 30 may be fixed at any position among the excavator main body 10 and members fixed to the excavator main body 10, not limited to the annular member 23, as in the first embodiment. .

A control device (control means) 31 is provided in the excavator main body 10 . This control device 31 includes a hydraulic control valve for supplying and discharging hydraulic pressure to and from the propelling jack 32, a servo valve for supplying and discharging hydraulic pressure to and from the damping jack 33, and the vibration measuring instrument 22, They are electrically connected to each other.

By controlling the hydraulic control valve, the control device 31 controls the thrusting jack 32 to push the segment S to move the excavator body 10 forward (by the thrust reaction force). , based on the measurement result of the vibration measuring device 22, the opposite phase vibration of the vibration generated in the excavator body 10 is calculated, and the valve opening degree of the servo valve is controlled, so that the vibration damping jack 33 Control is performed to output phase oscillation.

Further, the control device 31 may collectively perform the above-described control for all of the plurality of jack devices 30 as in the first embodiment. It is divided into a plurality of groups, and the vibration measuring instruments 22 are also provided with positions and numbers corresponding to the jacking devices 30 in each group, and based on the measurement results of the vibration measuring instruments 22, the antiphase vibration of the jacking devices 30 is controlled for each group. You may make it

As in the first embodiment, the object to which the control device 31 outputs the antiphase vibration may be all the jack devices 30 or some of the jack devices 30 . In addition, since the vibration measuring device 22 is arranged at a position corresponding to the propulsion jacks 20 to which the control device 21 outputs the antiphase vibration, it is not necessarily arranged corresponding to all the propulsion jacks 20. do not have.

In other words, the number of vibration damping jacks 33 installed may be smaller than the number of propelling jacks 32 installed, and the vibration measuring instruments 22 are provided corresponding to the vibration damping jacks 33 . The front end face of the propelling jack 32 to which the damping jack 33 is not attached is fixed to the annular member 23 .

In this way, in this embodiment, like the first embodiment, the vibration generated in the excavator main body 10 can be suppressed.

[Example 3]
In the tunnel excavator according to the present embodiment, the jack device 30 is changed to the jack device 40 described later, and the control device 31 is changed to the control device 41 described later in the second embodiment. In the following, the parts different from the second embodiment will be mainly described, and overlapping parts will be omitted as much as possible.

As shown in the enlarged cross-sectional arrow view of FIG. 4, the jack device (jack device 40) in this embodiment mainly includes a jack 42 for propelling and a jack 43 for damping vibration. The expansion and contraction of the damping jack 43 is controlled by a control device (control means) 41 based on the measurement result of the vibration measuring instrument (measurement means) 22 . The propelling jack 42 is the same as the propelling jack 32 of the second embodiment. The vibration measuring instrument 22 is installed at a position not too far from the fixed position of the jack device 40, as shown in FIG.

The damping jack 43 has an inner peripheral surface 43ba of a hollow driving rod 43b fixed to an outer peripheral surface 42ca of a cylinder portion 42c of the jack 42 for propelling. In addition, a convex portion 43bb projecting in the radial direction is formed as a piston portion of the damping jack 43 on the outer peripheral surface of the drive rod 43b. That is, the outer peripheral surface 42ca of the propelling jack 42 is the other end of the propelling jack 42, and the inner peripheral surface 43ba of the damping jack 43 is the other end of the damping jack 43. 6).

The cylinder portion 43c of the damping jack 43 is arranged on the outer circumference of the driving rod 43b, and the flange portion 43ca formed on the rear end side is fixed to the rear surface of the beam 18. As shown in FIG. That is, the flange portion 43ca serves as one end of the damping jack 43 (claims 3, 4 and 6).

As a result, the driving rod 43b can move in the direction of extension of the tunnel, and its range of movement is limited by the projection 43bb.

In the jack device 40, the propelling jack 42 and the damping jack 43 are configured as described above. , a propulsive reaction force can be applied to the excavator body 10 via the damping jack 43 and the beam 18 . That is, the excavator main body 10 can move forward due to the propulsion reaction force generated when the propulsion jack 42 presses the segment S. As shown in FIG. Also, the damping jack 43 can generate vibration by repeatedly expanding and contracting the drive rod 43b in small steps.

In this embodiment, the jack device 40 can be attached to the rear body side even in a structure in which the excavator body is divided into a front body and a rear body, as disclosed in Patent Document 2, for example. and becomes applicable.

INDUSTRIAL APPLICABILITY The present invention is suitable as a tunnel excavator and a tunnel excavation method for suppressing vibration generated when excavating the ground.

1 tunnel excavator 10 excavator main body 10a inner peripheral surface 11 cutter head 11a cutter rotating shaft 11b connecting member 12 partition wall 13 cutter turning motor 14 chamber 15 screw conveyor 18 beam 19 erector device 20 propelling jacks 20a, 32a, 33a, 42a spreader 20b, 32b, 33b, 42b drive rods 21, 31, 41 control device (control means)
22 Vibration measuring instrument (measuring means)
23 Annular members 30, 40 Jack devices 32, 42 Propulsion jacks 33, 43 Damping jacks S Segment T Tunnel

Claims (6)

A cylindrical excavator body, a cutter head that excavates the ground at the front end of the excavator body, and an erector that can assemble a lining member along the inner wall surface of the excavated tunnel at the rear of the excavator body. A tunnel boring machine comprising:
an extendable propulsion jack, one end of which is fixed at an arbitrary position among the excavator body and members fixed to the excavator body, and the other end of which is capable of pressing the existing lining member;
a measuring means for measuring vibrations generated in the excavator body;
The propulsion jack is subjected to expansion/contraction control for advancing the excavator body, and based on the measurement result of the measuring means, an anti-phase vibration that is in the opposite phase to the phase of the vibration generated in the excavator body is output. and a control means for performing expansion and contraction control ,
The propulsion jack generates the anti-phase vibration while the other end of the jack presses the existing lining member.
A tunnel excavator characterized by: The propulsion jacks are plural and divided into a plurality of groups of a predetermined number,
The measuring means are provided at positions corresponding to the groups,
The tunnel excavator according to claim 1, wherein the control means controls the propulsion jacks for each group based on the measurement result of the measurement means. A cylindrical excavator body, a cutter head that excavates the ground at the front end of the excavator body, and an erector that can assemble a lining member along the inner wall surface of the excavated tunnel at the rear of the excavator body. A tunnel boring machine comprising:
An extendable jack for propulsion, one end of which can press the existing lining member, and one end of which is fixed at an arbitrary position among the excavator body and a member fixed to the excavator body, a jack device, each comprising a retractable damping jack, the other end of which is fixed to the other end of the propelling jack;
a measuring means for measuring vibrations generated in the excavator body;
The propulsion jack is stretched and contracted to move the excavator body forward, and the damping jack is controlled based on the measurement result of the measuring means to control the phase of the vibration generated in the excavator body. A tunnel excavator characterized by comprising control means for performing expansion/contraction control for outputting antiphase vibration. The jack device is plural and divided into a plurality of groups of a predetermined number,
The measuring means are provided at positions corresponding to the groups,
The tunnel excavator according to claim 3, wherein the control means controls the damping jacks for each group based on the measurement results of the measurement means. A cylindrical excavator body, a cutter head that excavates the ground at the front end of the excavator body, and an erector that can assemble a lining member along the inner wall surface of the excavated tunnel at the rear of the excavator body. A tunnel excavation method using a tunnel excavator comprising a device,
The tunnel excavator further has one end fixed to an arbitrary position among the excavator body and a member fixed to the excavator body, and the other end capable of pressing the existing lining member. having a retractable propulsion jack,
The propulsion jack is stretched and contracted to move the excavator body forward, measures the vibration generated in the excavator body, and outputs antiphase vibration that is in the opposite phase to the phase of the vibration. Perform expansion and contraction control,
The propulsion jack generates the anti-phase vibration while the other end of the jack presses the existing lining member.
A tunnel excavation method characterized by: A cylindrical excavator body, a cutter head that excavates the ground at the front end of the excavator body, and an erector that can assemble a lining member along the inner wall surface of the excavated tunnel at the rear of the excavator body. A tunnel excavation method using a tunnel excavator comprising a device,
The tunnel excavator further includes a telescopic jack for propelling one end of which can press the existing lining member, and one end of the excavator main body and a member fixed to the excavator main body. , each comprising a retractable damping jack fixed at an arbitrary position and the other end fixed to the other end of the propulsion jack,
The propulsion jack is stretched and contracted to move the excavator body forward, the vibration generated in the excavator body is measured, and the damping jack is controlled to have a phase opposite to the phase of the vibration. A tunnel excavation method characterized by performing expansion and contraction control so as to output an anti-phase vibration of .

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