Shield tunneling machine and method for driving cutter head of shield tunneling machine

Abstract

To provide a shield machine and a method for driving a cutter head of the shield machine, capable of eliminating caking of earth and sand in a chamber without requiring a large driving force.SOLUTION: A shield machine 100 comprises a cutter head 1 that rotates and excavates earth and sand, a chamber 4 in which the earth and sand excavated by the cutter head 1 are stored, and a vibrating device 8 that liquefies the earth and sand in the chamber 4 by vibrating while the cutter head 1 is stopped.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a shield tunneling machine equipped with a cutter head and a method for driving the cutter head of a shield tunneling machine. [Background technology]

[0002] BACKGROUND ART Conventionally, a shield tunneling machine equipped with a cutter head is known (see, for example, Patent Document 1).

[0003] The aforementioned Patent Document 1 discloses an underground excavator including a cutter head, a chamber, and an agitator attached to a partition wall and positioned at the bottom of the chamber. The agitator has a screw blade that agitates the soil in the chamber. In the chamber, gravel and other particles in the mud settle and consolidate at the bottom of the chamber. As a result, depending on the degree of consolidation of the soil, the torque of the cutter head's drive source may become insufficient, making it impossible to rotate the cutter head. Therefore, in order to rotate the cutter head, the agitator is configured to forcibly agitate the soil in the chamber by rotating the screw blade. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-3690 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the underground excavator described in Patent Document 1 requires an extremely large torque (driving force) to rotate the screw blades in the consolidated soil and sand to forcibly agitate the soil and sand in the chamber. Therefore, as with the cutter head, depending on the degree of consolidation of the soil and sand, the torque of the drive source for the screw blades of the agitator may become insufficient, making it impossible to rotate the screw blades. In other words, the agitator has the problem that it cannot defuse the consolidated soil and sand in the chamber without a large driving force.

[0006] This invention has been made to solve the above-mentioned problems, and one object of the invention is to provide a shield tunneling machine and a cutter head driving method for a shield tunneling machine that are capable of eliminating compaction of soil and sand in a chamber without requiring a large driving force. [Means for solving the problem]

[0007] In order to achieve the above object, the shield tunneling machine of the present invention comprises a cutter head that rotates to excavate earth and sand, a chamber in which the earth and sand excavated by the cutter head is stored, a moving member; With the cutter head stopped By repeatedly moving the moving member back and forth within the chamber, and a vibration device that vibrates the soil in the chamber to liquefy it.

[0008] As described above, this shield machine is equipped with a vibration device that liquefies the soil in the chamber by vibrating it while the cutter head is stationary. This allows the soil to be liquefied and deconsolidated simply by continuously vibrating the soil, rather than forcibly stirring the soil in the chamber as in the past. In other words, even without the large driving force of conventional stirring devices, the soil can be deconsolidated as long as the vibration device is equipped with a relatively small driving force that is sufficient to vibrate the soil. Therefore, it is possible to deconsolidate the soil in the chamber without requiring a large driving force.

[0009] In the above shield machine, the vibration device preferably includes a movable member and a drive source that repeatedly moves the movable member back and forth within the chamber. With this configuration, compaction of soil and sand within the chamber can be eliminated with a simple configuration in which the movable member is repeatedly moved back and forth within the chamber by the drive source.

[0010] In this case, the vibration device is preferably provided on a partition wall that forms the chamber, and the vibration device is configured to hold the moving member in a retracted position where it does not protrude from the partition wall when the cutter head is driven, and to cause the moving member to enter the chamber by the drive source and repeatedly move back and forth within the chamber when the cutter head is stopped. With this configuration, by placing the moving member in the retracted position when the cutter head is driven, it is possible to prevent the moving member from being subjected to a load from soil and sand due to the rotation of the cutter head, which would otherwise damage the moving member.

[0011] In the above-described configuration in which the vibration device includes a moving member and a drive source, the moving member is preferably formed in a rod shape and arranged at the lower part of the chamber, so that the moving member arranged at the lower part of the chamber can effectively liquefy the soil and sand that has hardened due to the sedimentation of gravel and the like in the mud to the lower part of the chamber.

[0012] In the above shield tunneling machine, the vibration device is preferably configured to vibrate the soil in the chamber under predetermined vibration conditions that cause liquefaction. With this configuration, the soil in the chamber can be vibrated at a predetermined frequency that is favorable for liquefying the soil, so that the soil in the chamber can be deconsolidated with fewer vibration repetitions. As a result, the soil can be liquefied efficiently and effectively.

[0013] The shield machine preferably further comprises a mud-adding agent injector that injects mud-adding agent into the chamber when the cutter head is stopped and the soil in the chamber is vibrated. By configuring it in this way, the mud-adding agent can be injected into the chamber to more effectively liquefy the soil in the chamber when vibration is applied. [Effects of the Invention]

[0018] According to the present invention, as described above, it is possible to eliminate the compaction of soil and sand in the chamber without requiring a large driving force. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a cross-sectional view showing a shield tunneling machine according to an embodiment from the side. [Figure 2] FIG. 2 is a schematic front view of a bulkhead and a vibration device of a shield tunneling machine according to an embodiment. [Figure 3] 1 is an enlarged cross-sectional side view of a vibration device according to an embodiment. [Figure 4] (A) is a graph showing the relationship between the number of repeated movements of the moving member and the shear stress applied to the sediment in the chamber, (B) is a graph showing the relationship between the number of repeated movements of the moving member and the shear strain of the sediment in the chamber, and (C) is a graph showing the relationship with the excess pore water pressure ratio. [Figure 5] FIG. 10 is an enlarged cross-sectional side view of a vibration device according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0021] [Embodiment] A shield machine 100 according to an embodiment will be described with reference to FIGS. 1 to 4. FIG.

[0022] (Overall configuration of a shield tunneling machine) The shield tunneling machine 100 shown in Fig. 1 is a machine used for tunnel construction using the shield method. The shield tunneling machine 100 is a so-called mud pressure type machine.

[0023] As shown in Figure 1, the shield tunneling machine 100 comprises a cutter head 1 equipped with an agitating blade 10, a cylindrical body 2, a partition wall 3, a chamber (mud-making chamber) 4, a driving jack 5, a soil discharge device 6, a mud-adding material injection device 7, and a vibration device 8.

[0024] In each figure, the front-to-rear direction of the shield machine 100 is indicated by the X direction, the excavation direction (forward) within the X direction is indicated by the X1 direction, and the opposite direction to the excavation direction (rear) is indicated by the X2 direction.

[0025] In each drawing, the vertical direction of the shield machine 100 is indicated by the Z direction, the upper side of the Z direction is indicated by the Z1 direction, and the lower side is indicated by the Z2 direction.

[0026] In each drawing, the Y direction indicates the left-right direction (width direction) of the shield machine 100. The Y direction is perpendicular to both the X direction and the Z direction.

[0027] In each drawing, the axis located at the center of rotation of the cutter head 1 is indicated by a central axis of rotation α.

[0028] The cutter head 1 is configured to move forward in the excavation direction as it rotates around a central axis of rotation α extending in the excavation direction, thereby excavating the natural ground. The cutter head 1 is also configured to agitate the soil stored in the chamber 4 using a plurality of agitating blades 10 that protrude into the chamber 4 from the rear surface of the cutter head 1. The cutter head 1 is provided with a cutter drive unit 1a that applies a rotational force around the central axis of rotation α. ​​The cutter drive unit 1a is configured, for example, by a hydraulic motor. The rotation of the cutter head 1 is configured so that it can be switched between forward and reverse rotation depending on the excavation situation, etc.

[0029] The fuselage 2 is composed of a forward section 2a and aft section 2b. A cutter head 1 is installed at the front end of the forward section 2a in the excavation direction. The aft section 2b is the section that advances while arranging segments SG on the wall surface using an erector (not shown) to form the tunnel's circumferential wall as the forward section 2a excavates. The interior space of the fuselage 2 is divided by a partition wall 3 into two spaces: a chamber 4 on the excavation direction side and a work space WS behind the chamber 4.

[0030] Chamber 4 is a space that stores the soil excavated by cutter head 1. Chamber 4 is formed by the rear surface of cutter head 1, the inner surface of body 2, and the front surface of partition wall 3. In other words, chamber 4 is a space surrounded by cutter head 1, body 2, and partition wall 3. The mud pressure within chamber 4 is maintained in approximate equilibrium with the pressure acting on cutter head 1 from the natural ground by adjusting the amount of mud-adding material injected into chamber 4.

[0031] More specifically, in the mud pressure shield machine 100, mud additive is injected into the chamber 4 by the mud additive injection device 7 and mixed with the excavated soil, converting the excavated soil into impermeable mud with plastic flowability, which fills the chamber 4. The shield machine 100 maintains the chamber 4 filled with the excavated soil (mud) and generates mud pressure within the chamber 4 using the thrust of the propulsion jacks 5, thereby countering pressure on the natural ground (earth pressure at the face and groundwater pressure). The shield machine 100 excavates while maintaining pressure equilibrium by balancing the amount of excavation and the amount of soil discharged.

[0032] Here, the shield machine 100 rotates the cutter head 1 to mix the excavated soil and mud-adding material in the chamber 4, converting it into mud with plastic flowability. However, even if the excavated soil and sand contain little fine particles and a lot of gravel, the shield machine 100 can properly convert the soil into mud. If there is a relatively long construction downtime afterwards and the cutter head 1 is kept stopped for a relatively long period, the soil particles in the converted mud may settle and separate from the mud-adding material, resulting in the soil particles becoming densely consolidated in the lower part of the chamber 4. In other words, the shield machine 100 may lose the plastic flowability of the soil in the chamber 4 over time. Note that, as one example, the above-mentioned "construction downtime" refers to a period during which construction is suspended, such as during segment assembly or at night.

[0033] If the soil particles become densely packed, the shield tunneling machine 100 will need an extremely large torque to rotate the cutter head 1 when resuming excavation, and in some cases will be unable to rotate the cutter head 1.

[0034] Therefore, the shield tunneling machine 100 is configured to liquefy the soil by vibrating it in the chamber 4 with the cutter head 1 stopped using the vibration device 8, before rotating the cutter head 1 to resume excavation. In other words, the shield tunneling machine 100 is configured to break up the solidification of the soil using the vibration device 8. Details will be given later.

[0035] The propulsion jacks 5 are configured to push the segments SG rearward (in the X2 direction) to propel the shield machine 100. A plurality of propulsion jacks 5 are provided and lined up along the circumferential direction of the body 2.

[0036] The soil discharge device 6 is configured, for example, by a screw conveyor. An opening 6a at the front end of the soil discharge device 6 is connected to the lower side of the chamber 4. The soil discharge device 6 is configured to take in soil from the chamber 4 and discharge it into the work space WS by rotating an internal screw 60. The soil discharged from the soil discharge device 6 into the work space WS is transported toward the outside of the pit by a soil transport device (not shown) such as a belt conveyor.

[0037] The mud-adding material injection device 7 is configured to inject mud-adding material into the chamber 4. As one example, the mud-adding material is a material added to soil and sand that is primarily composed of bentonite. The mud-adding material injection device 7 includes a mud-adding material injection pipe 70 that communicates with the chamber 4, and a mud-adding material injection pump (not shown) that pressure-feeds the mud-adding material into the mud-adding material injection pipe 70. The mud-adding material injection device 7 is configured so that the amount of mud-adding material injected into the chamber 4 can be freely adjusted.

[0038] (Configuration of vibration device) As shown in FIG. 2, a plurality (six) of vibration devices 8 are provided on the partition wall 3. Each vibration device 8 is provided with a control unit 8a (see FIG. 1) that controls the drive of the vibration device 8. The control unit 8a is configured to be able to control the displacement of a moving member 80 of the vibration device 8. As an example, the control unit 8a is configured to be able to control the displacement of the moving member 80 of the vibration device 8 by controlling the drive of a pump (not shown) that supplies drive oil to the vibration device 8 and adjusting the amount of drive oil supplied to the vibration device 8.

[0039] Four of the multiple vibration devices 8 are positioned below the vertical center line β of the shield tunneling machine 100, and the remaining two are positioned above the vertical center line β. The multiple vibration devices 8 are also positioned symmetrically with respect to the left-right center line γ of the shield tunneling machine 100. The multiple vibration devices 8 are also positioned at approximately equal distances R from the central axis of rotation α when viewed from the direction of excavation. The two lowest of the multiple vibration devices 8 are positioned near the opening 6a of the soil discharge device 6 so as to sandwich the opening 6a from both the left and right sides.

[0040] As shown in FIG. 3, the vibration device 8 includes a moving member 80 and a drive source 81 that repeatedly moves the moving member 80 back and forth (linearly) within the chamber 4.

[0041] The moving member 80 is formed in a rod shape with the longitudinal direction being the front-rear direction (X direction). As one example, the moving member 80 is formed in a cylindrical shape extending in the front-rear direction. Alternatively, the moving member 80 may be formed in a rectangular pillar shape extending in the front-rear direction.

[0042] The vibration device 8 is configured to hold the moving member 80 at a retracted position where it does not protrude from the partition wall 3 when the cutter head 1 (see FIG. 1) is driven. In detail, the vibration device 8 is configured to hold the moving member 80 at a retracted position where the front end 80a of the moving member 80 is approximately flush with the partition wall 3 when the cutter head 1 is driven. The vibration device 8 is also configured to cause the driving source 81 to insert the moving member 80 into the chamber 4 and repeatedly move the moving member 80 back and forth within the chamber 4 when the cutter head 1 is stopped.

[0043] As an example, the driving source 81 is configured by a jack having a rod 81a and a cylindrical portion 81b that supports the rod 81a so that the rod 81a can move back and forth. A moving member 80 is attached to the front end of the rod 81a. The jack that configures the driving source 81 may be either a hydraulically driven jack or an electrically driven jack.

[0044] The tip of the cylindrical portion 81b of the driving source 81 is attached to a mounting seat 30 provided on the partition wall 3. In other words, the driving source 81 is attached to the partition wall 3 in a state where it is positioned relative to the partition wall 3 via the mounting seat 30.

[0045] The mounting seat 30 includes a first portion 30a extending rearward from the partition wall 3 and a second portion 30b extending upward from the rear end of the first portion 30a. That is, the mounting seat 30 is formed in an L-shape in a side view. A rod 81a extending in the front-rear direction is inserted into the second portion 30b.

[0046] The vibration device 8 is configured to vibrate the soil in the chamber 4 under predetermined vibration conditions that cause liquefaction. For example, the drive source 81 is configured to repeatedly move the moving member 80 back and forth within the chamber 4 at a relatively short frequency of 1 Hz or higher. The drive source 81 may also be configured to repeatedly move the moving member 80 back and forth within the chamber 4 under constant vibration conditions. The drive source 81 is also configured to freely change the predetermined vibration conditions for moving the moving member 80. For example, the drive source 81 may be configured to gradually increase or decrease any or all of the vibration conditions for moving the moving member 80 back and forth after the start of movement. The "predetermined vibration conditions that cause liquefaction" when moving the moving member 80 refer to vibration conditions that move the moving member 80 faster than the rate at which water escapes between the densely consolidated soil particles at the bottom of the chamber 4 after settling and separating from the mud-adding material. In this embodiment, the vibration conditions are determined by one or a combination of a predetermined frequency, a displacement amplitude, a velocity amplitude, and an acceleration amplitude.

[0047] The shear force exerted on the soil in the chamber 4 at a relatively short frequency causes the structure between the soil particles to collapse, resulting in a volume change. However, the water between the particles cannot move or deform in a short time, and pore water pressure, which acts as a force that moves the soil particles, is generated. This pore water pressure then builds up. When this pore water pressure exceeds the force of the soil particles' meshing, the soil particles become suspended within the soil. Note that the amplitude of the vibration device 8 can be very small, as long as it can apply repeated shear forces. The number of repeated movements of the moving member 80 by the vibration device 8 until liquefaction occurs varies depending on the vibration conditions of the vibration device 8, the particle size of the soil particles in the chamber 4, and the degree of consolidation.

[0048] Furthermore, it is necessary to apply shear force to the soil and sand using the moving member 80 at a speed that does not cause the pore water to escape, but by injecting a mud-adding material to increase the viscosity of the pore water, the speed at which the pore water moves can be reduced, making it possible to appropriately induce liquefaction even with a short period of shear force application. Therefore, the shield tunneling machine 100 is configured so that the mud-adding material injector 7 (see Figure 1) injects mud-adding material into the chamber 4 when the cutter head 1 is stopped and the soil in the chamber 4 is vibrated. The mud-adding material injection device 7 may inject mud-adding material continuously or repeatedly at time intervals.

[0049] Here, referring to Figure 4, we will explain examples of the relationship between the "number of repeated movements N" of the moving member 80 by the vibration device 8 when causing liquefaction, and each of the "shear stress," "excess pore water pressure ratio (the ratio of the increase in pore water pressure from the start of movement of the moving member 80 to the initial effective stress)," and "shear strain."

[0050] As shown in Figure 4(A), the movable member 80 is repeatedly moved back and forth so that a constant shear stress is applied to the soil and sand in the chamber 4. In this case, as shown in Figure 4(B), as the number of repeated movements N increases, the pore water pressure of the soil and sand in the chamber 4 builds up, and the excess pore water pressure ratio gradually increases. After about time T1, when the excess pore water pressure ratio approaches 1, the contact between the sand particles in the soil and sand in the chamber 4 becomes weak, and the sand particles are suspended in the pore water, which can be said to be a liquefied state.

[0051] 4(C), it can be seen that as the number of repeated movements N increases, and around time T1 when the soil becomes liquefied, the shear resistance of the soil in chamber 4 decreases and the amplitude of shear strain begins to gradually increase. In other words, around time T1 when the soil becomes liquefied, the displacement of moving member 80 increases.

[0052] The shield machine 100 shown in FIG. 1 moves the movable member 80 of the vibration device 8 to a retracted position at a predetermined timing when liquefaction of the soil in the chamber 4 progresses, and stops the movement of the movable member 80. Here, "liquefaction of the soil in the chamber 4 progresses" is determined, for example, when the displacement of the movable member 80 of the vibration device 8 reaches a predetermined value while the cutterhead 1 is stopped. As one example, the point at which "the displacement of the movable member 80 of the vibration device 8 reaches the predetermined value" corresponds to approximately the same time as the above-mentioned time T1 or a predetermined time after time T1. The shield machine 100 (control unit 8a) is configured to attempt to rotate the cutterhead 1. If the shield machine 100 is unable to rotate the cutterhead 1, it is configured to repeatedly move the movable member 80 of the vibration device 8 back and forth, and then attempt to rotate the cutterhead 1 again.

[0053] As an example, the state in which "the displacement of the movable member 80 of the vibration device 8 reaches a predetermined value" refers to a state in which the front end 80a of the movable member 80 reaches an intermediate position C between the front surface of the partition wall 3 and the rear surface of the cutter head 1. The timing to stop the movement of the movable member 80 and start driving the cutter head 1 may be determined not by the displacement of the movable member 80 reaching a predetermined value as a trigger, but by other methods such as the load that the vibration device 8 receives from the soil or the elapsed time since the vibration device 8 started moving. Specifically, the timing to stop the movement of the movable member 80 and start driving the cutter head 1 may be determined by the load that the vibration device 8 receives from the soil reaching a predetermined value as a trigger. The load that the vibration device 8 receives from the soil gradually decreases as the movement of the movable member 80 is repeated. Furthermore, the movable member 80 may be repeatedly moved back and forth until at least a state that causes liquefaction occurs.

[0054] (Cutter head drive method) The cutter head driving method by the shield tunneling machine 100 will now be described. The cutter head driving method is executed under drive control by the control unit 8a. The cutter head driving method comprises the following steps. The cutter head driving method by the shield tunneling machine 100 is executed when there is a relatively long construction stoppage period and the cutter head 1 is kept in a stopped state for a relatively long period of time. In other words, it is executed when it is thought that soil particles have settled in the chamber 4 and that soil compaction is progressing.

[0055] The cutter head driving method includes a step of liquefying the soil by vibrating the soil in the chamber 4 with the vibrating device 8 while the cutter head 1 for excavating the soil is stopped.

[0056] The cutter head driving method also includes a step of starting (attempting) to drive the cutter head 1 when the displacement of the vibrating device 8 reaches a predetermined value (the earth and sand are liquefied by the vibrating device 8).

[0057] (Effects of the embodiment) In this embodiment, the following effects can be obtained.

[0058] In this embodiment, as described above, a vibration device 8 is provided that liquefies the soil and sand in the chamber 4 by vibrating it while the cutter head 1 is stopped. This makes it possible to liquefy the soil and sand by simply continuously vibrating the soil, rather than forcibly stirring the soil and sand in the chamber 4 as in the conventional case. In other words, even without the large driving force required for conventional stirring devices, the soil and sand can be liquefied as long as the vibration device 8 has a relatively small driving force sufficient to vibrate the soil and sand. Therefore, the soil and sand in the chamber 4 can be liquefied without the need for a large driving force.

[0059] In this embodiment, as described above, the vibration device 8 includes the moving member 80 and the drive source 81 that repeatedly moves the moving member 80 back and forth within the chamber 4. This makes it possible to dissolve the compaction of soil and sand within the chamber 4 with a simple configuration in which the drive source 81 repeatedly moves the moving member 80 back and forth within the chamber 4.

[0060] In this embodiment, as described above, the vibration device 8 is provided on the partition wall 3 that forms the chamber 4, and the vibration device 8 is configured to hold the moving member 80 in a retracted position where it does not protrude from the partition wall 3 when the cutter head 1 is driven, and to cause the driving source 81 to insert the moving member 80 into the chamber 4 and repeatedly move the moving member 80 back and forth within the chamber 4 when the cutter head 1 is stopped. In this way, by placing the moving member 80 in the retracted position when the cutter head 1 is driven, it is possible to prevent the moving member 80 from being subjected to a load from soil and sand due to the rotation of the cutter head 1, and to prevent damage to the moving member 80.

[0061] In this embodiment, as described above, the moving member 80 is formed in a rod shape and is arranged at the lower side within the chamber 4. As a result, the moving member 80 arranged at the lower side within the chamber 4 can effectively liquefy the soil and sand that has hardened due to the settling of gravel and other particles in the mud to the lower part of the chamber 4.

[0062] In this embodiment, as described above, the vibration device 8 is configured to vibrate the soil in the chamber 4 under predetermined vibration conditions that cause liquefaction. This allows the soil in the chamber 4 to be vibrated under predetermined vibration conditions that are favorable for liquefying the soil, so that the soil in the chamber 4 can be deconsolidated with fewer vibration repetitions. As a result, the soil can be liquefied efficiently and effectively.

[0063] As described above, this embodiment further includes a mud-adding agent injector 7 that injects mud-adding agent into the chamber 4 when the soil in the chamber 4 is vibrated while the cutter head 1 is stopped. By injecting mud-adding agent into the chamber 4, the soil in the chamber 4 can be more effectively liquefied when vibration is applied.

[0064] In this embodiment, as described above, a step is provided in which the vibrating device 8 vibrates the soil in the chamber 4 while the cutter head 1 is stopped, thereby liquefying the soil. This makes it possible to liquefy the soil by vibration, rather than forcibly stirring the soil in the chamber 4 as in the conventional method. In other words, the vibrating device 8 can vibrate the soil regardless of the degree of consolidation of the soil, and therefore, by repeatedly vibrating the soil and liquefying it, the soil in the chamber 4 can be liquefied regardless of the degree of consolidation of the soil in the chamber 4.

[0065] [Variations] The embodiments and modifications disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims rather than the description of the above embodiments, and further includes all modifications (modifications) within the meaning and scope of the claims.

[0066] For example, in the above embodiment, an example was shown in which the shield machine was a so-called mud pressure type machine, but the present invention is not limited to this. In the present invention, the shield machine may also be a so-called mud water type machine.

[0067] In the above embodiment, an example was shown in which vibrations for liquefying soil and sand were generated by moving the movable member back and forth, but the present invention is not limited to this. In the present invention, as in the vibration device 208 shown in Fig. 5, a built-in vibrator 281 may be provided in the vibration device 208, and the vibrator 281 may generate vibrations for liquefying soil and sand. In this case, the vibrator 281 may be installed on the partition wall 3 via a cushioning material 282 such as rubber.

[0068] Furthermore, in the above embodiment, an example in which six vibration devices are provided is shown, but the present invention is not limited to this. In the present invention, one to five vibration devices, or seven or more vibration devices may be provided.

[0069] Furthermore, the arrangement of the vibration device relative to the partition wall is not limited to the position shown in the above embodiment, and in the present invention, the arrangement of the vibration device relative to the partition wall may be at a position different from the position shown in the above embodiment.

[0070] In the above embodiment, the vibrating device is provided on the partition wall, but the present invention is not limited to this. In the present invention, the vibrating device may be provided on the cutter head, the body, or the like.

[0071] In the above embodiment, the moving member is moved back and forth by a jack as a driving source, but the present invention is not limited to this. In the present invention, the moving member may be moved back and forth by a configuration other than a jack, such as a solenoid.

[0072] In the above embodiment, the mud-adding material is directly injected into the chamber by the mud-adding material injector, but the present invention is not limited to this. In the present invention, the mud-adding material may be indirectly supplied into the chamber by injecting the mud-adding material into the front side of the cutter head by the mud-adding material injector. [Explanation of symbols]

[0073] 1 cutter head 3 Bulkhead 4 chambers 7 Mud material injection device 8, 208 Vibration device 80 Moving parts 81 Power Source 100 Shield tunneling machine

Claims

1. A cutter head that rotates to excavate soil and sand, a chamber in which the soil excavated by the cutter head is stored; A shield tunneling machine comprising: a vibration device that includes a moving member and repeatedly moves the moving member back and forth within the chamber while the cutter head is stationary, thereby vibrating and liquefying the soil and sand within the chamber.

2. The vibration device is The moving member; 2. The shield machine according to claim 1, further comprising: a drive source that repeatedly moves the moving member back and forth within the chamber.

3. the vibration device is provided in a partition wall that forms the chamber, The vibration device is When the cutter head is driven, the moving member is held at a retracted position where it does not protrude from the partition wall, and 3. The shield machine according to claim 2, wherein the driving source is configured to cause the moving member to enter the chamber and repeatedly move back and forth within the chamber while the cutter head is stationary.

4. 4. The shield machine according to claim 2, wherein the moving member is formed in a rod shape and is disposed at a lower side within the chamber.

5. The shield tunneling machine according to any one of claims 1 to 4, wherein the vibration device is configured to vibrate the soil in the chamber under predetermined vibration conditions that cause liquefaction.

6. The shield machine according to any one of claims 1 to 5, further comprising a mud injection device that injects mud into the chamber when vibrating the soil in the chamber while the cutter head is stopped.

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