JPH0953391A - Transport device of excavation, tunnel excavator, and method of excavating tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a cavitation, and improve the carrying-out efficiency of excavation by sending excavation to a sealed pressure reducing tank by a jet pump to reduce the pressure lower than the atmospheric pressure, and sending the resulting excavation to a separating equipment by a carrying-out pump. SOLUTION: A jet pump 101 is connected to the lower part 24b of a hopper 24 of a tunnel excavator 10, high pressure water is sprayed to a throat part 104 through a jet nozzle 102, and excavation is carried to a sealed pressure reducing tank 107 through a drain pipe 104 and temporarily stored therein. The excessive air taken together with the excavation is sucked and discharged by a vacuum pump 109 to reduce the pressure within the tank 107 lower than the atmospheric pressure, and the excavation and carrying water are then carried to separating equipment by a centrifugal carrying-out pump 111 through a carrying-out pipe line 110, and separated. Since the tank 107 has a negative pressure, the blocking of the drain pipe 105 by the excavation and a cavitation in the pump 111 are prevented. A feed water quantity of a feed pump 116 is controlled by a storage signal of a watergauge 125 in the tank 107 and a negative pressure signal of the vacuum pump 109.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel excavator for excavating rock or the like to form a tunnel, a transport device for excavating an excavated product generated by this rock excavation or the like to the outside of the tunnel, and tunnel excavation. It is about the method.

[0002]

2. Description of the Related Art In a tunnel excavator for excavating a natural ground to excavate a tunnel, in particular, a tunnel boring machine (hereinafter referred to as TBM) for excavating rock mass.
There is. This tunnel boring machine, TBM
In the above, a cutter head that can be driven and rotated is attached to the front part of a front body having a cylindrical shape, and a large number of disk cutters that destroy rocks are attached to the cutter head. In addition, a front gripper capable of holding the front body in position by being pressed against the inner wall surface of the excavated tunnel is mounted on the front body. On the other hand, a cylindrical rear body that is relatively movable along the excavation direction is connected to the rear part of the front body.
A rear gripper capable of holding the rear body in position by being pressed against the inner wall surface of the excavated tunnel is mounted on the rear body.
Further, between the front body and the rear body, a plurality of thrust cylinders for advancing them are installed.

Therefore, in order to excavate and form a tunnel with the TBM constructed as described above, while the rear body is held in position in the tunnel by the rear gripper, a plurality of thrust cylinders are extended while the cutter head is rotationally driven. A large number of disk cutters excavate the rock in front, and the front body moves forward. Then, when the thrust cylinder extends by a predetermined stroke, the drive of the thrust cylinder is stopped, and the front gripper holds the front body in position while the rear gripper releases the position of the rear body. When the plurality of thrust cylinders are contracted in this state, the rear body is pulled closer to the front body and moves forward. After that, in the same way as described above, while holding the rear body in position by the rear gripper, releasing the position of the front body by the front gripper and extending the plurality of thrust cylinders while rotating the cutter head, the rock mass is excavated. While the front torso moves forward. By repeating this, a tunnel of a predetermined length is excavated and formed.

In the above-mentioned TBM, rock masses, rock fragments, earth and sand (hereinafter referred to as "shears") produced by excavating rock mass with a disk cutter are taken into a hopper, and a belt conveyor installed along the inside of a conveying pipe. TBM
It is transported to the rear of the car and discharged outside the tunnel.

However, in such a method of carrying out the shear by a belt conveyor, rock masses and rock fragments produced by excavating rock can be carried by this belt conveyor, but mud and muddy water can be carried. There is a problem that it cannot be done, and it falls on the way and gets into the drive part of the belt conveyor and causes a failure. Also, TB
In the case of M, it is necessary for the worker to perform various works in the front body and the rear body, such as replacement work due to wear of the disk cutter and geological exploration work. The above-mentioned TBM is provided with a belt conveyor for off-loading, and the belt conveyor, the transport pipe, and the like occupy the front body and the rear body. Therefore, in a small-diameter TBM, the belt conveyor and the transport pipe are an obstacle, and the working space of the worker cannot be sufficiently secured, and the disc cutter replacement work and the geological exploration work are efficiently performed. There was a problem that I could not.

As a solution to such a problem, there is one disclosed in Japanese Utility Model Publication No. 4-49274. In the tunnel excavator disclosed in this publication, a jet pump is arranged at the bottom of a hopper, and a shear inlet communicating with the hopper is formed downstream of a water flow accelerating nozzle of the jet pump. Therefore, by accelerating the pressurized water supplied from the pump through the pipe by the nozzle of the jet pump, a negative pressure is generated in the throat near the shear intake, and the shear in the hopper is generated by the negative pressure water flow. It is sucked together with air and water, put on this water stream and discharged to the outside.

As an excavation-shear transporting device using this jet pump, there is one disclosed in Japanese Examined Patent Publication No. 32-37437. The excavated shear transportation device disclosed in this publication takes in the excavated material produced by excavating rock mass into a hopper, conveys the excavated material in the hopper by a jet pump, and temporarily stores it together with carrier water in an atmosphere open tank. , The excavated material and the carrier water in the atmosphere open tank are carried out by the carry-out pump and transported to the separation facility, where the excavated material and the carrier water in the mixed state are separated, and the separated excavated material is carried out. On the other hand, the carrier water is newly replenished and supplied to a water supply pump that supplies high-pressure water to the jet pump by the water supply pump.

[0008]

As described above, the conventional tunnel excavator disclosed in Japanese Utility Model Publication No. 4-49274 and the excavation-shear transport device disclosed in Japanese Patent Publication No. 32-37437 are jet jets. By using a pump,
Not only rock blocks and rock fragments, but also mud and muddy water can be reliably transported without falling, and since the slide out device is configured with only supply and discharge pipes, this slide out device is used. It can be small. Then, by providing a slip-out pump system behind the jet pump line system via an atmosphere open tank, the slip-out amount and the water supply amount are set to appropriate amounts, and cavitation is prevented from occurring. It is possible to transport the excavation shear efficiently.

However, in this conventional tunnel excavator, in the excavation-shear transport device using the jet pump,
By sucking the shear in the hopper together with air and water by the negative pressure water flow generated at the throat of the shear inlet, discharging it on the water flow to the outside, and temporarily storing it in the atmosphere open tank through the pipeline, Here, the air mixed in the excavated material and the carrier water is discharged. In this case, if the pipeline that is carried out from the jet pump to the atmosphere open tank is long, there is a risk that the slip will be stagnated in the pipeline and the inside will be blocked. for that reason,
It is necessary to devise the shape of the throat part in order to supply high-pressure water with a jet pump or to make the supplied water faster and generate a large negative pressure. Therefore, the speed of the water supplied to the jet pump is increased, or the water pump is enlarged to increase the amount,
There is a problem that the shape of the throat portion of the jet pump becomes complicated and the cost increases.

The present invention is intended to solve such a problem, and it is intended to surely carry out excavated materials such as rock masses, rock fragments, and sand produced by excavation to improve the work efficiency of excavated material transportation work. An object of the present invention is to provide a transport device for excavated material, a tunnel excavator, and a tunnel excavation method.

[0011]

In order to achieve the above-mentioned object, the excavator transportation apparatus of the present invention is an excavated object transportation apparatus for accumulating excavated objects excavated by rotation of a cutter head and discharging them to the outside. In, a jet pump for carrying out excavated material provided at the rear of the cutter head, a sealed decompression tank for temporarily storing the excavated material carried out by the jet pump and carrier water, and carrier water to the jet pump. A water supply pump for supplying water, a water level gauge provided in the closed pressure reducing tank, and a water supply discharge to the closed pressure reducing tank and the water supply pump based on the water level measured by the water level gauge in the closed pressure reducing tank. A water supply pump whose amount is adjusted, a flow meter provided in a carry-out system of excavated material and carrier water in the closed type decompression tank, and the carry-out carried out by the flow meter It is characterized in that comprises a discharge pump for maintaining the discharge quantity to the set value.

Therefore, in the excavated material transportation apparatus of the present invention, the excavated material excavated by the rotation of the cutter head is carried together with the transported water by the jetted jet of the transported water fed from the water pump. The air is discharged and temporarily stored in a closed type decompression tank, where excess air is removed and the inside pressure is reduced to atmospheric pressure or lower. Then, the carry-out pump operates so as to maintain the carry-out amount of the carry-out system measured by the flow meter at the set value, and carries out the excavated material and the carrier water in the hermetic decompression tank. Is assisted and cavitation is prevented from occurring. On the other hand, the water supply pump operates based on the water level in the closed type decompression tank measured by the water level gauge, and adjusts the amount of water supplied to the closed type decompression tank and the water supply pump. Blockage in the pipeline due to is prevented and the excavated material and carrier water are efficiently carried out.

Further, the excavated material transportation apparatus of the present invention is characterized in that a vacuum pump is connected to the closed type decompression tank so as to suck excess air in the closed type decompressed tank to atmospheric pressure or less.

Therefore, in the excavated material transportation apparatus of the present invention, excess air is removed from the excavated material and the carrier water temporarily stored in the closed type decompression tank by the negative pressure generated by the vacuum pump. At the same time, the inside pressure is reduced to below atmospheric pressure, and the excavated material and the carrier water discharged by the jet pump are sucked from the sealed decompression tank side to improve the discharge efficiency, and the air mixed in the drilled material and the carrier water is removed. It is removed and cavitation is prevented from occurring in the carry-out system.

Further, in the excavated material transporting apparatus of the present invention, a separation facility is connected to a carry-out system for carrying out the excavated material and the carrier water from the closed type decompression tank by the carry-out pump. The water supply system for supplying the separated carrier water is connected to the water supply pump.

Therefore, in the excavated material transport apparatus of the present invention, the mixture of the excavated material and the carrier water carried out by the carry-out pump from the closed type decompression tank is carried to the separation facility,
Here, it is separated into excavated material and carrier water, and the separated excavated material is carried out, while the separated carrier water is sucked by the water supply pump and supplied to the sealed decompression tank and the water supply pump, The carrier water can be circulated efficiently.

Further, in the excavated material transportation apparatus of the present invention, the water pump for supplying high-pressure water is connected to the base end portion of the excavated material discharge jet pump, and the air suction for sucking air from the outside is provided. It is characterized by having a mouth.

Therefore, in the excavated material transport apparatus of the present invention, high-pressure water is supplied to the jet pump for carrying out the excavated material from the water supply pump, and at the same time, air is sucked in, and the excavated material is discharged. Be promoted.

Further, the tunnel excavator of the present invention comprises a tubular excavator body, a cutter head rotatably mounted on the front portion of the excavator body, and a propulsion mechanism for advancing the excavator body. A hopper for accumulating the excavated material excavated by the cutter head, a jet pump for excavating the excavated material connected to a lower portion of the hopper, and a temporary storage of the excavated material and the carrier water delivered by the jet pump. Sealed decompression tank, water pump for feeding carrier water to the jet pump, carry-out pump for carrying out excavated material and carrier water in the sealed decompressed tank, excavated material and carrier water carried out by the carry-out pump And a feed water for feeding the carrier water separated by the separator or the newly replenished carrier water to the sealed decompression tank and the water pump. It is characterized in that comprises a pump.

Therefore, in the tunnel excavator of the present invention, when the cutter head is driven and rotated and the excavator main body moves forward by the propulsion mechanism, the rotating cutter head destroys the rock mass and the excavated excavated product is hoppered. The excavated material in the hopper is discharged together with the carrier water by ejecting the carrier water sent from the water supply pump from the jet pump, and the excavated material and the carrier water are temporarily stored in the sealed decompression tank. Be stored. Here, excess air is removed from the excavated material and the carrier water, and the inside of the tank is kept at the atmospheric pressure or less, so that the discharge force of the jet pump is assisted and the occurrence of cavitation is prevented. Then, the excavated material and the carrier water in the closed decompression tank are carried out to a separation facility by a carry-out pump, the mixture of the excavated material and the carrier water is separated, and the separated carrier water is newly replenished with water. Water is supplied to the sealed decompression tank and the water supply pump by the water supply pump, which prevents blockages in the respective pipelines and enables continuous operation of the excavator.

Further, the tunnel excavation method of the present invention is generated by excavating the rock mass in front of the rock mass by advancing the cylindrical main body while driving and rotating the cutter head attached to the front part, and excavating the rock mass. While the excavated material is taken into the hopper, high-pressure water is sent from the water supply pump to the jet pump to convey the excavated material in the hopper by the jet pump, and the excavated material and the conveyed water are temporarily stored in a sealed decompression tank. The stored excess air is sucked to reduce the atmospheric pressure to below atmospheric pressure, and the excavated material and carrier water in this closed decompression tank are carried out by a carry-out pump and transported to a separation facility, where the separated excavated material is carried out. While being treated, the carrier water and the newly replenished carrier water are supplied to the closed type decompression tank and the water supply pump by a water supply pump.

Therefore, in the tunnel excavation method of the present invention, the excavated material produced by excavation of rock is taken into the hopper, the high-pressure water is sent from the water pump to the jet pump, and the excavated material in the hopper is sent by this jet pump. To an airtight decompression tank, temporarily store here and suck the excess air inside to bring it below atmospheric pressure, then carry out this excavated material and carrier water by a carry-out pump and carry it to a separation facility, Separation will take place here, and suction of excess air in the closed decompression tank will prevent cavitation from occurring in the system for carrying out excavated material and carrier water, and will keep the pressure in the closed decompression tank below atmospheric pressure. As a result, the discharge force of the jet pump is assisted, and as a result, blockage in each pipeline is prevented and continuous operation of the excavator becomes possible.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

In the embodiments described below, the tunnel excavator of the present invention is a tunnel boring machine (TBM) for excavating rock, and the transport device of excavated material of the present invention is the TB.
It will be described as a transportation device that discharges rock masses and rock fragments (sliding) generated by rock excavation by M to the outside.

<Overall structure of tunnel boring machine>
2 is a cross section of a tunnel boring machine as a tunnel excavator according to an embodiment of the present invention, FIG. 3 is a front view of this tunnel boring machine, FIG. 4 is a cross section taken along line IV-IV of FIG.
FIG. 5 shows a VV cross section of FIG. 2, FIG. 6 shows a VI-VI cross section of FIG. 2, and FIG. 7 shows an outline of a parallel link mechanism as a propulsion mechanism.

Tunnel boring machine 10 of this embodiment
As shown in FIGS. 2 and 3, the excavator main body includes a front body 11, a middle body 12, and a rear body 13 each having a cylindrical shape. A cutter head 15 is rotatably mounted on a front portion of the front body 11 by a bearing 14. The cutter head 15 has spokes 16 that are radially intersecting with each other fixed to the front surface thereof. A large number of disk cutters 17 for shearing and breaking the rock mass are pivotally mounted, and a scraper 18 for scraping the excavated surface of the rock mass is fixed. A ring gear 19 having internal teeth is integrally fixed to the rear portion of the cutter head 15, while a cutter turning hydraulic motor 20 is fixed to the front body 11, and a drive gear 21 of the cutter turning hydraulic motor 20 is Ring gear 19
Are engaged.

Further, a bulkhead 22 is formed on the front body 11 so as to separate the cutter head 15 side from the cutter drive motor 20 side so that the shear generated by excavation does not enter the inside. This bulkhead 22
A chamber chamber 23 is formed between and. And
A hopper 24 for accumulating the offset is fixedly provided to the bulk head 22 in the chamber 23, and the cutter head 1
A scraping plate 25 is fixed to the inside of the scraper 5 for scraping up the scrap that has been destroyed and dropped and taking it into the hopper 24. Further, at the lower part of the hopper 24, a discharging device 26 for discharging the shear accumulated in the hopper 24 to the outside is attached.

Therefore, when the cutter drive motor 20 is driven to rotate the drive gear 21, the ring gear 19 meshing with the drive gear 21 rotates, the cutter head 15 integrated with the ring gear 19 turns, and the disc cutter 17 rotates. The shear rock breaks the rock mass, and the scraper 18 scrapes off the excavated surface, whereby the rock mass can be excavated. Then, the shear generated by excavation falls into the chamber 23, and the scraping plate 25 rotates together with the cutter head 15 to scrape the shear in the chamber 23 and drop it into the hopper 24.
The slip that has fallen and accumulated in the hopper 24 is discharged by the discharging device 2.
6 is discharged to the outside.

As shown in FIGS. 2 and 5, the middle case 12 is swingably connected to the rear part of the front case 11 via a spherical bearing 27. The rear body 13 is connected to the inner peripheral surface of the rear portion of the middle body 12 via bearings 28 so as to be movable in the excavation direction. Six propulsion jacks 31 to 36 as a propulsion mechanism are installed between the front body substrate 29 fixed to the rear portion of the front body 11 and the rear body substrate 30 fixed to the front portion of the rear body 13. ing. The propulsion jacks 31 to 36 are expanded and contracted by supplying and discharging hydraulic pressure. The jack main body is swingably supported by a ball bearing 37 fixed to the rear body substrate 30, and the rod tip portion is front body substrate 29. Ball bearing 3 fixed to
It is swingably supported by 8. The propulsion jacks 31 to 36 are arranged adjacent to each other. For example, the propulsion jack 31 is inclined to one side in the circumferential direction of the cutter head 15, and the propulsion jack 32 is inclined to the other side in the circumferential direction of the cutter head 15. Then, the parallel link mechanism 39 is configured by being arranged in a truss shape as a whole.

Therefore, by driving the propulsion jacks 31 to 36 of the parallel link mechanism 39 individually to extend and contract the drive rods, the front body 1 having the cutter head 15 is provided.
1 can be swung with respect to the middle barrel 12, and the excavation direction can be changed. Further, by driving the propulsion jacks 31 to 36 of the parallel link mechanism 39 synchronously to extend the drive rod, the front body 11 and the middle body 12 having the cutter head 15 can be moved forward with respect to the rear body 13. .

Here, the plurality of propulsion jacks 31 described above are used.
The configuration of the control system of the parallel link mechanism 39 including the components 36 to 36 will be described.

As shown in FIG. 7, propulsion jacks 31-3.
6, hydraulic pressure supply / discharge pipes 41, 42 are connected to two pressure chambers partitioned by a piston (not shown) of the propulsion jack 31.
Is a servo valve 45 via the emergency shutoff valves 43 and 44, respectively.
It is connected to. This servo valve 45 is used for the propulsion jack 3
The hydraulic pressure supply and discharge to each pressure chamber of No. 1 are switched, and are connected to a hydraulic pressure supply / discharge source 48 via connection pipes 46 and 47.

Further, a displacement sensor 49 for detecting the operating position of the propulsion jack 31 is mounted, and the displacement sensor 49 is connected to the control section 51 via the controller 50. The servo valve 45 described above is connected to the control unit 51 via the servo amplifier 52. An operation unit 53 having a plurality of joystick levers and an emergency stop button 54 are connected to the control unit 51.

Therefore, the displacement sensor 49 is provided in the propulsion jack 3
The operating position of No. 1 is detected, and the detection signal is output to the control unit 51 via the controller 50. Control unit 5
1 outputs a command signal to the servo amplifier 52 based on this detection signal, the servo amplifier 52 controls the servo valve 45 based on the command signal, and the hydraulic pressure between the hydraulic pressure supply / discharge source 48 and the propulsion jack 31 is changed. It is designed to supply and discharge. Although only the propulsion jack 31 has been described here, the other propulsion jacks 32 to 36 have the same configuration.

Further, as shown in FIGS. 2 and 4, four front grippers 55 are supported on the front body 11 so as to be radially movable at equal intervals in the circumferential direction, and each front gripper 55 is built in. It can be driven by a hydraulic cylinder 56. Therefore, by driving this hydraulic cylinder 56 to move each front gripper 55 in the radial direction,
The front gripper 55 can be moved to a position where it is housed in the front case 11 and a position where the outer case is pressed against the inner wall surface of the tunnel formed by excavation and holds the front case 11.

On the other hand, as shown in FIGS. 2 and 6, on the rear body 13, two rear grippers 57 are supported so as to be radially movable at equal intervals in the circumferential direction, and each rear gripper 57 has a built-in hydraulic cylinder. It can be driven by 58. Therefore, by driving the hydraulic cylinders 58 to move the rear grippers 57 in the radial direction, the position where the rear grippers 57 are housed in the rear case 13 and the outer peripheral surface are pressed against the inner wall surface of the tunnel formed by excavation. The body 13 can be moved to a position for holding it.

The TBM 10 is a tunnel excavator for rock excavation, and the rear gripper 5 of the rear body 13 described above is used.
Although the excavation reaction force is obtained by 7 to propel the front body 11, when the ground during tunnel excavation changes from the rock layer to the general sediment layer, the excavated tunnel wall surface is soft, and the rear gripper 57 is used. You cannot get the digging reaction force. Therefore, in this TBM 10, as in a shield excavator, the front body 11 can be propelled by obtaining excavation reaction force by the segment.

That is, as shown in FIGS. 2 and 6, the rear body 1
Four shield jacks 59 are arranged in the circumferential direction in parallel at the rear portion of 3, and a spreader 60 is attached to the front end portion of the drive rod extending rearward. Therefore, when the shield jack 59 is operated to extend the drive rod rearward in the excavation direction, the spreader 60 is pressed against the existing segment S constructed on the excavated tunnel inner peripheral surface, and the reaction force causes the front body 11 to move. Also, the middle body 12 and the rear body 13 can be moved forward. A tail packing 61 is fixed to the inner peripheral surface of the rear portion of the rear body 13 so as to be in close contact with the outer peripheral surface of the existing segment S and prevent the infiltration of earth and sand into the rear body 13.

<Structure of Link Type Segment Elector Device> FIG. 8 shows a side view of the link type segment elector device applied to the tunnel boring machine of this embodiment, and FIG. 9 shows a front view of the link type segment elector device.

As shown in FIG. 2, the TBM 10 of the present embodiment.
The segment erector device 62 mounted on the rear body 13 is of a link type and is provided on a fixed plate 63 fixed to the rear portion of the rear body 13, and the erector device 62 is moved forward by the shield jack 59 (the rear body 13 (excavator)). The new segment S is mounted in the space between the main body) and the existing segment S.

That is, as shown in FIGS. 8 and 9, four support rollers 65, which are rotatable by brackets 64, are attached to the fixed plate 63 at equal intervals in the circumferential direction. A ring 66 is rotatably supported, and a ring gear 67 having internal teeth is fixed to the rotary ring 66. A hydraulic motor 69 is fixed to the fixed plate 63 by a bracket 68, and a drive gear 70 of the hydraulic motor 69 is connected to the ring gear 6
It meshes with 7 inner teeth. Therefore, when the drive gear 70 is rotationally driven by driving the hydraulic motor 69, the ring gear 67 meshing with the drive gear 70 is rotated, and the ring gear 6 is rotated.
A rotating ring 66 integral with 7 can be swiveled.

A fixed base 71 fixed to the rotating ring 66 has a pair of connecting links 72 and a pair of movable links 7.
The movable base 74 is supported via the third movable link 73, and the main body of the hydraulic jack 75 is pivotally attached to the pair of movable links 73.
The tip of the drive rod is connected to the fixed base 71. A slide body 77 is screwed onto the screw rod 76 of the moving table 74, and the slide body 77 is movable by the rotation of the screw rod 76. The slide bracket 77 is attached to the mounting bracket 78 fixed to the slide body 77. The hanging metal fitting 80 is detachable by the connecting pin 79. The lower portion of the hanging metal fitting 80 is a threaded portion, which is screwed in advance to the inner surface of the segment S carried in by a device (not shown).

Therefore, with respect to the hanging metal fitting 80 screwed to the segment S, the slide body 77 is moved to align with the mounting bracket 78, and the hanging metal fitting 80 is connected to the mounting bracket 78 by the connecting pin 79. By that,
The segment S can be held. When the hydraulic jack 75 is driven to expand and contract the drive rod, the movable link 73 and the connecting link 72 rotate up and down, and the fixed base 7
By moving the moving table 74 up and down with respect to 1, the held segment S can be moved up and down. Furthermore, the hydraulic motor 6
By driving 9 to rotate the rotating ring 66 together with the ring gear 67, the held segment S can be moved along the inner wall surface of the tunnel.

<Operation of Tunnel Boring Machine> In order to construct a tunnel by excavating rock mass with the tunnel excavator configured as described above, as shown in FIG. Front gripper 55
The front cylinder 11 is made movable by retracting and storing it in the front cylinder 11, while driving (extending) the hydraulic cylinder 58.
Then, each rear gripper 57 is pushed out and the outer peripheral surface is pressed against the inner wall surface of the tunnel formed by excavation, whereby the rear case 13 is held immovably. In this state, the propulsion jacks 31 to 3 of the parallel link mechanism 39 are driven while driving the cutter turning drive motor 20 to rotationally drive the cutter head 15.
6 is extended and the cutter head 15 is moved forward together with the front body 11. Then, the disc cutter 17 of the rotating cutter head 15 shears and breaks the bedrock, and the scraper 18
Excavates the rock by scraping the excavated surface. Then, by changing the operation strokes of the propulsion jacks 31 to 36 at this time, the front body 11 bends through the middle body 12 and the spherical bearing 27, and the direction of the cutter head 15 is changed to change the tunnel excavation direction. can do.

Further, as shown in FIG. 7, a detection signal of the operating position of the propulsion jacks 31 to 36 detected by the displacement sensor 49 is input to the control unit 51, and the control unit 51 sets the excavation condition set in advance. (The shape and dimensions of the tunnel to be excavated,
(E.g. length) and a detection signal of the displacement sensor 49 to output a command signal to the servo amplifier 52 to control the servo valve 45, and supply / discharge the hydraulic pressure between the hydraulic pressure supply / discharge source 48 and the propulsion jacks 31 to 36. I do. Therefore, the propulsion jacks 31 to 36 are reciprocally driven by a predetermined amount by supplying and discharging hydraulic pressure, and the cutter head 15 is swung forward while controlling the X direction, Y direction, Z direction and ψ direction, θ direction, and φ direction. Let

When the propulsion jacks 31 to 36 are extended by a predetermined stroke, the drive of the propulsion jacks 31 to 36 is stopped, and the hydraulic cylinder 56 is driven (extended) to push out the front grippers 55 to excavate the outer peripheral surface. By pressing the inner wall surface of the formed tunnel, the front case 11 is held immovable and the hydraulic cylinder 58 is driven (reduced).
Then, each rear gripper 57 is retracted and stored in the rear body 13, so that the rear body 13 can be moved. In this state,
Each of the propulsion jacks 31 to 36 of the parallel link mechanism 39 is contracted to move the rear body 13 toward the front with respect to the front body 11 and the middle body 12. Then, similarly to the above, each front gripper 55 is retracted and stored in the front body 11,
While making the front body 11 movable, each rear gripper 57 is pushed out to press the outer peripheral surface of the rear gripper 57 against the inner wall surface of the tunnel.
Is immovable. In this state, each of the propulsion jacks 31 to 31 of the parallel link mechanism 39 is driven by driving the cutter turning drive motor 20 to rotate the cutter head 15.
The rock head is excavated by the disk cutter 17 and the scraper 18 by extending 36 and moving the cutter head 15 together with the front body 11 forward. The tunnel is excavated and formed by repeating this process.

This disc cutter 17 and scraper 1
The shear generated by the rock excavation of No. 8 falls into the chamber 23 from the gap of the cutter head 15,
The scraping plate 25 rotating together scrapes up the shear in the chamber 23 and drops it into the hopper 24. Then, the slip accumulated in the hopper 24 and accumulated therein is discharged by the discharging device 2
6 is discharged to the outside.

By the way, when the rock is excavated to form the tunnel, as described above, the rear gripper 57 presses against the inner wall surface of the tunnel to hold the rear case 13 immovable, whereby each of the parallel link mechanisms 39 is moved. The propulsion jack 31 obtains an excavation reaction force by the rear barrel 13 to move the front barrel 11 forward, and excavates the rock mass in front by the cutter head 15 that turns. On the other hand, when the ground during excavation of the tunnel changes from the rock layer to the general earth and sand layer, since the inner wall surface of the tunnel is weak, the rear gripper 57 cannot obtain the propulsion reaction force, and therefore the shield jack 59 is installed in the existing segment. In S, the forward reaction force is obtained and the front body 11, the middle body 12, and the rear body 13
Promote.

That is, with the spreaders 60 of the plurality of shield jacks 59 being pressed against the existing segment S,
By extending the shield jack 59, the main body of the tunnel excavator, that is, the front body 11, the middle body 12, and the rear body 13 is advanced by the pushing reaction force, and at the same time, the cutter drive motor 20 is driven to drive the cutter head. 15 is turned and the general sand layer is excavated by the disc cutter 17 and the scraper 18. Then, when the excavator main body including the front body 11, the middle body 12, and the rear body 13 moves forward by a predetermined amount, one of the shield jacks 59 is operated in the contraction direction, and the space between the spreader 60 and the existing segment S is increased. A void is formed, and a new segment S is attached to this void by the segment elector device 62.

As shown in FIGS. 8 and 9, an operator screw-engages the hanging metal fitting 80 with respect to the segment S carried into the tunnel by a truck (not shown). Then, the slide body 77 of the elector device 62 is moved to position the mounting bracket 78 above the hanging metal fitting 80 fixed to the segment S, and the hanging metal fitting 80 is connected to the mounting bracket 78 by the connecting pin 79. As described above, while the segment S is held by the mounting bracket 78, the hydraulic jack 75 is driven to rotate the movable link 73 to move the movable table 74 up and down, and the hydraulic motor 69 is driven to rotate the rotary ring 66. The movable table 74 is swung by turning, and the held segment S is transferred in the tunnel and assembled at a predetermined position on the inner wall surface of the tunnel. Then, when the segment S is fixed to the inner wall surface of the tunnel, the holding of the segment S is released and the segment S returns to its original position. The tunnel is built by repeating this.

As described above, in the TBM 10 described above, the cutter head 15 is rotated while the tunnel excavator main body (front cylinder 11, middle cylinder 12, rear cylinder 13) is moved forward by the parallel link mechanism 39 or the shield jack 59, and the disc cutter is rotated. By excavating the rock mass with the scraper 17 and the scraper 18, accumulating the shear generated by the rock mass excavation in the hopper 24, and then discharging it to the outside by the discharging device 26, the segment S is mounted on the inner wall surface of the tunnel by the segment erector device 62. , Building a tunnel.

In the TBM 10 of the above embodiment, the parallel link mechanism 39 is provided with the six propulsion jacks 31.
The number of propulsion jacks is not limited to six, but may be eight or ten. In any case, the same operational effect as described above can be obtained. You can

Further, in the TBM 10 of the above embodiment, the parallel link mechanism 39 is used as the propulsion mechanism of the excavator body and the mechanism for changing the excavation direction, but the tunnel excavator of the present invention is not limited to this. Absent.

<Structure of excavated material transportation device> Here, an excavated material transportation device applied to the above-described tunnel boring machine will be described. FIG. 1 shows a schematic configuration of an excavated material transportation device mounted on a tunnel boring machine according to a first embodiment of the present invention.

<Structure of Excavator Transporting Apparatus of First Embodiment>
As shown in FIG. 1, a cutter head 15 is rotatably attached to a front portion of a front body 11 that constitutes the excavator body.
A large number of disk cutters 17 are mounted on the front surface of the cutter head 15. On the other hand, a ring gear 19 having internal teeth is integrally fixed to the rear portion of the cutter head 15, and a drive gear of a cutter swing hydraulic motor (not shown) is meshed with the gear. Further, a chamber chamber 23 is formed by the bulkhead 22 in the front case 11, and a hopper 24 for accumulating the slip in the chamber chamber 23 and a discharge device 26a for discharging the shear accumulated in the hopper 24 to the outside are provided. ing.

In this discharging device 26a, the hopper 24
On the other hand, a slip accumulation opening 24a is formed in the upper part, while a jet pump 101 is attached to the lower part and is communicated with a slide intake opening 24b. A jet nozzle 102 is formed in the front part of the jet pump 101 and a water supply pipe 103 is connected thereto, while a throat part 104 is formed in the rear part and a discharge pipe 105 is connected thereto. Therefore, the water pipe 103
When high-pressure water is sent from the jet pump 101, the high-pressure water is jetted from the jet nozzle 102 to the throat section 104,
The jet water is depressurized in the throat portion 104, and a negative pressure is generated, and the negative pressure allows the shear in the hopper 24 to be sucked and discharged through the discharge pipe 105.

A discharge pipe 105 connected to the throat portion 104 of the jet pump 101 is a sealed decompression tank via an operation valve 106.
It is connected to 107. The closed type decompression tank 107 is for temporarily storing rock blocks, rock fragments, earth and sand, carrier water, spring water, dust and the like (hereinafter referred to as excavation shear) transported in the discharge pipe 105. A vacuum pump 109 is connected to the closed type decompression tank 107 via an operation valve 108. By operating the vacuum pump 109 to open the operation valve 108, the closed decompression tank 107 is drilled. Excess air taken in together with the shear can be sucked and discharged, and the inside of the sealed decompression tank 107 can be depressurized to atmospheric pressure or lower. Therefore, by removing the air mixed in the excavation shear, the air will not enter the centrifugal unloading pump 111 of the unloading pipeline 110 at the rear side described later, and the occurrence of cavitation can be prevented. Tank 107
When the inside pressure is equal to or lower than the atmospheric pressure, it is possible to prevent the blockage by sucking the excavation shear that has been swept in the discharge pipe 105 by the jet water of the jet pump 101.

Further, the discharge line 110 described above is connected to the sealed decompression tank 107, and the operation valve 11 is connected to the discharge line 110.
2 and the unloading pump 111 and the flow meter 113 are attached, and the unloading pipeline 110 is connected to a separation facility 114 for separating the excavated shear into rock blocks, rock fragments, and sediment and water. Therefore, the unloading pump 1
11 is capable of discharging the excavated shear stored in the closed decompression tank 107 to the separation facility 114 through the unloading pipeline 110, at which time, the flow meter 113 measures the unloading volume of the unloading pipeline 110, and the unloading volume is measured. A flow rate signal can be output to and controlled by the carry-out pump 111 so that is maintained at the set value.

In the separation facility 114, the excavated shear carried by the unloading pump 111 through the unloading pipeline 110 is separated into rock fragments, earth and sand and water, and the rock fragments and earth and sand are treated by a treatment facility (not shown). Water is connected to the water supply line 11
It is inhaled in 5 and can be reused. That is, the water supply pipe 115 is connected to the separation facility 114, and the water supply pump 115 is attached to the water supply pipe 115. And
This water supply pipe 115 is branched into two at a branch portion 117,
118 is connected to the water supply pipe 103 via the water supply pump 119 and the operation valve 120, and the bypass pipe 121 is connected to the closed type decompression tank 107 via the operation valve 122. Therefore, the water supply pump 116
Can supply the water separated by the separation facility 114 to the water supply pump 119 and the sealed decompression tank 107 through the water supply pipe 115, and the water supply pump 119 and the water supply pipe 103 can supply the water to the jet pump 101. . The separation facility 114 is supplied with makeup water 123 when water is insufficient, and overflow water 124 is discharged when excess.

Further, a water level gauge 125 is provided in the above-mentioned closed type decompression tank 107, which detects the water surface of the internal excavation and outputs the stored signal to the water supply pump 116 to control it. be able to. Further, the vacuum pump 109 described above also outputs the negative pressure signal to the water supply pump 116.
Therefore, the water supply pump 116 controls the amount of water supplied from the separation facility 114 based on the storage signal from the water level gauge 125 in the closed pressure reducing tank 107 and the negative pressure signal from the vacuum pump 109.

<Operation of Excavator Transporting Apparatus of First Embodiment>
First, as the first preparation step, the operation valve 120 of the water supply pipe 118 and the operation valve 106 of the discharge pipe 105 are closed, while the bypass pipe 12
The operation valve 122 of 1 and the operation valve 112 of the discharge pipeline 110 are opened, and the separation facility 114, the water supply pipeline 115, the branch section 117, the bypass pipeline 121,
The closed decompression tank 107 and the carry-out pipeline 110 form a closed pipeline. When the carry-out pump 116 and the water supply pump 116 are driven in this state, the water supply discharged from the water supply pump 116 flows through this closed pipe line. Here, the discharge flow rate of the carry-out pump 111 is controlled to be a predetermined flow rate by a signal from the flow meter 113 provided in the carry-out pipeline 110. Further, the discharge flow rate of the water supply pump 116 is controlled so that the water level in the closed decompression tank 107 becomes a constant water level by the water level gauge 125. Therefore,
The carry-out pump 111 of the carry-out pipeline 110 does not cause cavitation.

Then, as the second and final step, the water supply pipe 11
8 operation valve 120, discharge pipe 105 operation valve 106, vacuum pump 10
When the operation valve 108 of 9 is opened, the separation facility 114 and the water supply line 11
5, branch 117, water supply pipe 118, water supply pipe 103 jet pump 10
1, the discharge pipe 105, the closed decompression tank 107, and the transfer pipe 110 form a closed pipe, and the closed pipe from the branch portion 117 to the bypass pipe 121 and the closed decompression tank 107. When the water supply pump 119 and the vacuum pump 109 are driven in this state, the water supply discharged from the water supply pump 116 passes through this closed pipe line, and the rest passes through the bypass pipe line 121 and flows into the sealed decompression tank 107. . At this time, the vacuum pump 109 sucks and discharges the excess air in the hermetic decompression tank 107, the inside pressure is reduced to atmospheric pressure, and the discharge flow rate of the water supply pump 116 is controlled so that the internal pressure is maintained constant. It Further, in the same manner as described above, the closed pressure reducing tank 107
Water pump 125 by water level gauge 125 so that the water level of 1 does not fluctuate
16 discharge flow rates are controlled.

When the first and second preparatory operations as described above are completed, the rock excavation by the TBM is started.

That is, the disk of the cutter head 15 is moved forward by moving the cutter head 15 together with the front body 11 by the propulsion mechanism (for example, the parallel link mechanism 39, see FIG. 2) while rotating the cutter head 15. The cutter 17 shear-breaks the rock mass and excavates the rock mass.
And the shear generated by rock excavation is the cutter head 1
The scraping plate 25 that falls into the chamber 23 through the gap 5 and rotates together with the cutter head 15 is
Scraping up the inside of the hopper 3 from the stacking opening 24a.
It falls in 4 and is accumulated.

The shear accumulated in the hopper 24 enters the jet pump 101 through the intake opening 24b by gravity. On the other hand, the jet pump 101 is supplied with pressurized water from a water supply pipe 103, accelerated by a jet nozzle 102 and jetted to a throat portion 104. In the throat section 104, the water jet from the jet nozzle 102 is decompressed, a negative pressure is generated, and the shear in the hopper 24 is dust or air,
The water is sucked into the throat portion 104 through the intake opening 24b together with water. Then, the sucked skid rides on the water flow and is discharged through the discharge pipe 105.

As a result, the excavated sludge, which is composed of the rock blocks and rock fragments discharged by the jet pump 101, the earth and sand, the carrier water, the spring water, the dust, etc., passes through the discharge pipe 105 and the closed type decompression tank 1
Delivered to 07. At this time, a crusher may be provided in the closed type decompression tank 107, and the crusher may be finely crushed so as to be easily carried out in the transfer pipeline 110. In addition, at this time, the closed type decompression tank
Air is mixed in the 107 together with the excavation by the jet pump 101, but the vacuum pump 109 operates to suck and discharge the excess air in the hermetic decompression tank 107, whereby the hermetic decompression tank 107 The air does not enter the carry-out pump 111 of the carry-out pipeline 110 for carrying out the excavated shear inside, and the occurrence of cavitation can be prevented. Further, the inside of the closed type decompression tank 107 is decompressed to the atmospheric pressure or less by the vacuum pump 109, and by this, the jet pump
The water jetted at 101 forcibly sucks the excavated shear that has flowed through the discharge pipe 105 and discharges it to the sealed decompression tank 107, so that the discharge pipe 105 can be prevented from being blocked.

In this case, the water level in the closed type decompression tank 107 tends to fluctuate due to an increase in spring water from the face, but the discharge amount of the water supply pump 116 is adjusted by the detection of the water level meter 125 and becomes constant. Maintained. For example, when the water level in the sealed decompression tank 107 becomes lower than a predetermined value, a signal is output to the water supply pump 116 in a direction to increase the discharge flow rate, and a flow rate higher than the water supply amount supplied to the jet pump 101 is discharged from the water supply pump 116. It Then, the surplus flow rate is passed through the bypass line 121 at the branch point 117 and the closed decompression tank 107.
Therefore, the jet pump 101 is supplied with only a required constant flow rate.

On the other hand, when a large amount of spring water or the like is generated, this spring water is also transferred to the closed type decompression tank 107 by the jet pump 101, so that the water level tends to become higher than a predetermined value. However, when the water level gauge 125 detects this state, a signal for reducing the discharge flow rate is output to the water supply pump 116, the water supply flow rate to the jet pump 101 is reduced, and the jet pump 101 is affected by the reduced water supply flow rate and spring water. Since the surplus water amount is supplied, sufficient nap raising is performed, and the water level of the sealed decompression tank 107 is maintained constant.

With the water level of the closed type decompression tank 107 kept constant, the excavation shear in the closed type decompression tank 107 is carried out to the carry-out pipeline 110, and the carry-out pump 111 is set by the flow meter 113.
A signal is received to discharge a constant flow rate. Then, the discharged excavation slide is conveyed to the separation facility 114 through the discharge pipeline 110. In this separation facility 114, the excavated shear is separated into rock fragments and earth and sand and water, and the water is stored as water supply, while the rock fragments and earth and sand are transported to another treatment facility for treatment.
When the water supply is insufficient during the initial operation or the like, the shortage is replenished as makeup water 123, and when the spring water increases, the surplus water is discharged as overflow water 124.

As described above, in the excavated material transportation apparatus according to the present embodiment, the excavated shear accumulated in the hopper 24 is discharged to the closed type decompression tank 107 by the high-pressure water ejected from the jet pump 101, and Vacuum pump for temporary storage 1
By removing the excess air in the closed type decompression tank 107 by 09 and reducing the pressure to the atmospheric pressure or lower, after that, it is carried out by the carry-out pump to the separation facility 114 through the carry-out conduit 110. Air does not enter the carry-out pump 111 of the 110, thereby preventing the occurrence of cavitation, and forcibly sucking the excavation shear that has been swept in the discharge pipe 105 by the jet pump 101 and discharging it to the sealed decompression tank 107. This exhaust pipe 1
Blocking of 05 can be prevented, and the efficiency of discharge of excavation by jet pump is improved.

[0071]

As described above in detail with reference to the embodiments, according to the excavator transporting apparatus of the present invention, the excavator and the carrier water carried by the jet pump for excavating the excavate are sealed in a decompression tank. The discharge amount of excavated material and carrier water in this closed type decompression tank is measured by a flow meter and the discharge amount of excavated material and carrier water is conveyed by a discharge pump so as to maintain the set value. On the other hand, based on the water level measured by the water level gauge installed in the closed pressure reducing tank, the water supply pump adjusts the amount of water supply to the closed pressure reducing tank and the water supply pump, and the water supply pump sends the carrier water to the jet pump. As a result, the air inside the sealed decompression tank is not discharged and the air does not enter the carry-out pump, and it is possible to prevent the occurrence of cavitation. The inside of the closed decompression tank is in a negative pressure state and the jet pump forcibly sucks the excavated material swept through the discharge pipe and discharges it into the closed decompression tank. The discharge efficiency of the excavated material by the pump can be improved, and as a result, the transport efficiency of the excavated material can be improved.

Further, according to the excavated material transportation apparatus of the present invention, since the vacuum pump for sucking the excess air in the closed type depressurized tank to make it below atmospheric pressure is connected to the closed type depressurized tank, the closed type depressurized tank is temporarily operated. For excavated materials and carrier water stored,
Excess air is removed by the generation of negative pressure by the vacuum pump, and the inside pressure is reduced to atmospheric pressure, and the excavated material and the carrier water discharged by the jet pump are sucked from the sealed decompression tank side to improve discharge efficiency. The air mixed in the excavated material and the carrier water can be removed to prevent the occurrence of cavitation in the carry-out system.

Further, according to the excavated material transporting apparatus of the present invention, a separation facility is connected to a carry-out system for carrying out the excavated material and the carrier water from the closed type decompression tank by the carry-out pump, and the separation equipment separates from the excavated material. Since a water supply pump was connected to the water supply system for supplying the transported water, the mixture of the excavated material and the transported water carried out by the carry-out pump from the sealed decompression tank was transported to the separation facility, where it was transported together with the excavated material. The separated excavated matter is separated into water and the separated excavated material is carried out, while the separated carrier water is sucked by the water supply pump and supplied to the sealed decompression tank and the water supply pump, which efficiently circulates the carrier water. Therefore, the cost can be reduced.

Further, according to the excavated material transportation apparatus of the present invention, a water pump for supplying high-pressure water is connected to the base end portion of the excavated material discharge jet pump, and an air suction port for sucking air from the outside is provided. Therefore, high-pressure water is supplied from the water feed pump to the jet pump for carrying out the excavated material, and at the same time, air is sucked in, whereby the discharge of the excavated material can be promoted.

Further, according to the tunnel excavator of the present invention,
A cutter head is attached to the front part of the excavator body to enable it to move forward by a propulsion mechanism, and a jet pump for carrying out excavated material is connected to the lower part of a hopper that accumulates excavated material, and the excavated material carried out to this jet pump and transportation Connect a sealed decompression tank that temporarily stores water, connect a discharge pump that carries the excavated material and carrier water in the sealed decompression tank to a separation facility, and seal the separated carrier water in this separation facility. Since the water pump that feeds the carrier water is connected to the pressure reducing tank and the jet pump, the air inside the closed pressure reducing tank will not be discharged and the air will not enter the discharge pump, and cavitation will not occur. In addition to being able to prevent it, it is possible to improve the discharge efficiency of the excavated material by the jet pump because the pressure inside the closed type decompression tank becomes negative. Result, it is possible to improve the tunneling work efficiency. In addition, because the efficiency of discharging the excavated material by the jet pump is improved, it is possible to arrange a processing facility such as a closed decompression tank for the main body of the excavated gas behind the tunnel, providing a sufficient working space inside the main body of the excavator. Can be secured.

Further, according to the tunnel excavating method of the present invention, the rock mass is excavated by advancing the main body while driving and rotating the cutter head, and the excavated material produced is taken into the hopper, while the water pump is changed to the jet pump. High-pressure water is sent and the jet pump conveys the excavated material in the hopper,
After temporarily storing this excavated material and carrier water in a closed type decompression tank and sucking excess air inside to make it below atmospheric pressure,
The carry-out pump was used to convey the separated water to the separation facility, and the water feed pump was used to supply the sealed decompression tank and the water pump with water, so the air in the sealed decompression tank was discharged to the carry-out pump. Since air does not enter, cavitation can be prevented from occurring, and the inside of the closed type decompression tank can be in a negative pressure state to improve the discharge efficiency of the excavated material by the jet pump. The efficiency of excavation work can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a transportation device for excavated material according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a tunnel boring machine as a tunnel excavator according to an embodiment of the present invention.

FIG. 3 is a front view of a tunnel boring machine.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 2;

FIG. 7 is a schematic view of a parallel link mechanism as a propulsion mechanism.

FIG. 8 is a side view of a link type segment erector device applied to the tunnel boring machine of the present embodiment.

FIG. 9 is a front view of a link-type segment erector device.

[Explanation of symbols]

 11 Front Body (Tunnel Excavator Body) 12 Middle Body (Tunnel Excavator Body) 13 Rear Body (Tunnel Excavator Body) 15 Cutter Head 20 Cutter Swing Hydraulic Motor 23 Chamber Chamber 24 Hopper 26 Discharge Device 31-36 Propulsion Jack 39 Parallel Link mechanism 59 Shield jack 101 Jet pump 103 Water pipe 105 Discharge pipe 107 Closed pressure reducing tank 109 Vacuum pump 111 Export pump 113 Flow meter 114 Separation equipment 116 Water supply pump 119 Water supply pump 125 Water level meter

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Keizo Kazama 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo headquarters (72) Inventor Makoto Inoue 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Kaoru Fujisawa 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office

Claims (6)

[Claims] 1. A transport device for excavated material, which collects excavated material by rotating a cutter head and discharges the excavated material to the outside, and a jet pump for carrying out excavated material provided behind the cutter head, and the jet pump. A closed type decompression tank for temporarily storing the excavated material and the carried water carried out by, a water pump for feeding the carrying water to the jet pump, a water level gauge provided in the closed type decompression tank, and the water level meter A water supply pump in which the amount of water supplied to the closed type decompression tank and the water supply pump is adjusted based on the water level in the closed type decompression tank measured by An excavated product, comprising: a flow meter provided in the carry-out system; and a carry-out pump for maintaining the carry-out amount of the carry-out system measured by the flow meter at a set value. Transportation equipment. 2. The excavated material transporting apparatus according to claim 1, wherein a vacuum pump for sucking excess air therein to reduce the atmospheric pressure to below atmospheric pressure is connected to the sealed decompression tank. Transportation equipment. 3. The excavation material transportation apparatus according to claim 1, wherein a separation facility is connected to a carry-out system for carrying out the excavation material and the carrier water from the hermetic decompression tank by the carry-out pump, and the separation equipment is used for excavation. A transport device for excavated material, wherein the water supply pump is connected to a water supply system for supplying carrier water separated from an object. 4. The excavation material transport apparatus according to claim 1, wherein the water pump for supplying high-pressure water is connected to a base end portion of the excavation material discharge jet pump, and air is sucked from the outside. A transport device for excavated material, comprising an air intake port. 5. A tubular excavator main body, a cutter head rotatably mounted on a front portion of the excavator main body, a propulsion mechanism for advancing the excavator main body, and excavation by the cutter head. A hopper for accumulating the excavated material, a jet pump for excavating the excavated material, which is connected to a lower portion of the hopper, a sealed decompression tank for temporarily storing the excavated material and the carrier water delivered by the jet pump, and the jet A water supply pump for supplying carrier water to the pump, and a carry-out pump for carrying out the excavated material and the carrier water in the sealed decompression tank,
Separation equipment for separating the excavated material and the carrier water carried out by the carry-out pump, and water supply for supplying the carrier water separated by the separation equipment or the newly supplied carrier water to the sealed decompression tank and the water supply pump A tunnel excavator characterized by having a pump. 6. The front rock is excavated by advancing the tubular main body while drivingly rotating the cutter head attached to the front part, and the excavated material produced by excavating the rock is taken into the hopper. , High-pressure water is sent from the water pump to the jet pump, and the excavated material in the hopper is transported by the jet pump, and the excavated material and the transported water are temporarily stored in a sealed decompression tank to remove excess air inside. Suction to atmospheric pressure or less, and the excavated material and carrier water in this closed type decompression tank are carried out by a carry-out pump and transported to a separation facility.The separated excavated material is carried out while carrying water and The tunnel excavation method, wherein newly supplied carrier water is supplied to the closed type decompression tank and the water supply pump by a water supply pump.