JP2014005677A - Tunnel excavation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tunnel excavation system in which clogging by excavated earth is hardly caused when the excavated earth resulting from excavation of a ground is conveyed backward.SOLUTION: In an excavation unit 10: a space 20E is formed in a rotary section shell body 20 and openings 36 are formed on a front end face of the rotary section shell body 20; excavated earth from an excavation mechanism 14 is accommodated in the space 20E through the openings 36; clearances 20D are formed between the rotary section shell body 20 and stationary portion shell bodies 22, 24, 26 on an inner side face of the excavation unit 10; the space 20E and a space on the inner side of the excavation unit 10 are communicated with each other through the clearances 20D, and the excavated earth accommodated in the space 20E is discharged in the inside of the excavation unit 10 through the clearances 20D; and a belt conveyor transports the excavated earth resulting from excavation of the ground by a breaker 62 along with the excavated earth discharged from the space 20E into the inside of the excavation unit 10 through the clearances 20D backward.

Description

  The present invention relates to a tunnel excavation system for excavating a tunnel in the ground.

  In recent years, a ring shield method has been known as a method for efficiently constructing a shield tunnel having a large cross section. In the ring shield construction method, the excavation device having an annular cutter portion is used to first excavate the ground at a position corresponding to the outer portion of the tunnel into an annular cross section, and to construct a lining body in a cylindrical shape on the excavated portion. Repeat the process and the step of propelling the excavator by taking the reaction force on the lining body and excavating the ground in an annular cross section in advance, and in parallel with this, in the cylindrical shape inside the lining body A tunnel is constructed by excavating the remaining earth and sand from the rear side (see Patent Document 1).

Japanese Patent No. 2840732

  Here, in the apparatus described in Patent Document 1, excavated soil excavated by the cutter unit is agitated with water to form a liquid, and is carried out of the tunnel through a mud pipe that opens at the front of the cutter unit. However, in the method of discharging excavated soil through the discharge pipe in this way, there is a possibility that soil and sand will be clogged in the mud pipe. Thus, if clogging of excavated soil occurs, it will take a lot of labor for inspection and repair.

  The present invention has been made in view of the above problems, and an object thereof is to provide a tunnel excavation system in which clogging of excavated soil is less likely to occur when the excavated soil generated by excavating the ground is conveyed backward. It is to be.

  In order to solve the above problems, a tunnel excavation system according to the present invention is a tunnel excavation system for excavating a tunnel in the ground, and includes a cylindrical excavator for excavating the ground in an annular cross-section, and a cylindrical excavator. An excavator that is disposed in the inner space of the excavator and excavates the ground of the inner portion of the portion excavated in an annular cross section by the excavator, and extends rearward from the inner space of the excavator; The excavator is connected to a cylindrical rotating part shell provided at a tip part in the excavation traveling direction, and to the rear of the rotating part shell. Excavation including a cylindrical shell including a cylindrical fixed shell, a cutter formed on a tip surface of the rotating shell, and a rotating mechanism that rotates the rotating shell relative to the fixed shell. The mechanism and the rotating shell are pushed in the direction of excavation. A propulsion mechanism, and an opening is formed in the front end surface of the rotating part shell, and an accommodating space is formed in the rotating part shell, and the excavated soil excavated by the excavating mechanism is accommodated in the accommodating space through the opening. A gap is formed between the rotating shell and the fixed shell on the inner surface of the excavator, and the accommodating space and the inner space of the excavator communicate with each other through the gap and are accommodated in the accommodating space. The excavated soil is discharged into the inner space of the excavator through the gap, and the transport means excavates the excavated soil generated by excavating the ground with a heavy excavator from the accommodating space into the inner space of the excavator through the gap. It is transported toward the rear together with soil.

  According to the present invention having the above-described configuration, the excavated soil generated by excavating the ground with the cutter unit is accommodated in the accommodating space through the opening formed in the front end surface of the rotating portion shell, and is located behind the accommodating space. Since it is discharged from the formed gap into the internal space of the excavator and does not use a mud pipe or the like as in the prior art, occurrence of clogging of excavated soil can be suppressed.

  Moreover, in this invention, it is preferable that the inside of the accommodation space is divided | segmented into the some chamber in the circumferential direction by the some board | plate material.

  According to the present invention having the above configuration, the excavated soil accommodated in the accommodating space is sent toward the gap by rotating the plate member as the rotating part shell rotates. Furthermore, the rigidity of the rotating part shell can be improved by the plate material.

  Further, in the present invention, further comprising a crusher provided inside the excavator, excavated soil generated by excavating the ground with the excavator heavy machine, and the internal space of the excavator through the gap from the accommodation space The discharged excavated soil is preferably transported rearward by the transporting means after the rock contained in the excavated soil is crushed by the crusher.

  According to the present invention having the above-described configuration, even if large excavated soil that may hinder smooth transport by the transporting means is included in the excavated soil, it can be finely crushed by the crusher. Can be transported smoothly.

  Further, in the present invention, it is preferable that a gantry connected to the rear of the excavator is further provided, the gantry is movable in the excavation traveling direction, and the conveying means is supported by the gantry.

  According to the present invention having the above-described configuration, the conveying means and the gantry can move together as the excavation apparatus advances.

  According to the present invention, occurrence of clogging of excavated soil can be suppressed.

1 is a vertical sectional view in a tunnel longitudinal direction showing a configuration of a tunnel excavation system according to an embodiment of the present invention. It is a perspective view of the excavation apparatus used for excavation of the ground in a tunnel excavation part. It is a longitudinal direction vertical sectional view of the excavator used for excavation of the ground in the tunnel excavation part. It is a front view of the excavator used for excavation of the ground in a tunnel excavation part. It is VV sectional drawing in FIG. It is VI-VI sectional drawing in FIG. It is VII-VII sectional drawing in FIG. It is a figure for demonstrating the propulsion method of a digging apparatus, and the placement method of concrete.

Hereinafter, an embodiment of a tunnel excavation system and a tunnel excavation method of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a tunnel showing the configuration of the tunnel excavation system of the present embodiment. As shown in the figure, the tunnel excavation system 1 of the present embodiment includes a tunnel excavation area 4 for excavating the ground using an excavator 10 provided at the forefront of the tunnel excavation traveling direction, and a rear of the tunnel excavation area 4. The primary lining area 6 for performing primary lining, an inverting area 8 for installing inverts behind the primary lining area 6, and a scraping area 9 for performing staking behind the inverting area 8. Is done.

  2 to 7 show a drilling device 10 used for ground excavation in a tunnel excavation section, FIG. 2 is a perspective view, FIG. 3 is a longitudinal sectional view in a longitudinal direction, FIG. 4 is a front view, and FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 3, and FIG. 7 is a sectional view taken along line VII-VII in FIG.

  As shown in FIGS. 2 and 3, the excavator 10 includes a cylindrical shell 12, a drilling mechanism 14 provided at the tip of the shell 12 in the excavation progress direction (hereinafter referred to as the front), and excavation soil discharge. A mechanism 16 and a propulsion mechanism 18 for propelling the excavation mechanism 4 are provided.

  The shell 12 is composed of a rotating part shell 20, a first fixed part shell 22, a second fixed part shell 24, and a third fixed part shell 26 that are sequentially connected from the front. The

  The rotating portion shell 20 includes an annular tip surface portion 20A that forms a tip surface, a cylindrical outer cylinder 20B that extends rearward from the outer periphery of the tip surface portion 20A, and a cylinder that extends rearward from the inner periphery of the tip surface portion 20A. A cylindrical inner cylinder 20C.

  Further, the first fixed part shell 22, the second fixed part shell 24, and the third fixed part shell 26 have substantially the same diameter as the outer cylindrical body 20B of the rotating part shell 20, respectively. The formed cylindrical outer cylinders 22B, 24B, 26B and the outer cylinders 22B, 24B, 26B are arranged in substantially the same diameter as the inner cylinder 20C of the first fixed portion shell 22. The cylindrical inner cylinders 22C, 24C, 26C, and a plurality of support members (not shown) provided to connect the inner cylinders 22C, 24C, 26C and the outer cylinders 22B, 24B, 26B. The These shells 20, 22, 24, and 26 are each made of steel. The first fixed portion is formed such that a gap 20D is formed between the rear end of the inner cylindrical body 20C of the rotating portion shell 20 and the front end of the inner cylindrical body 22C of the first fixed portion shell 22. The shell 22 terminates in front of the front end of the inner cylindrical body 22C.

  Inner cylinders 20C, 22C, 24C, 26C and outer cylinders constituting the rotary part shell 20, the first fixed part shell 22, the second fixed part shell 24, and the third fixed part shell 26 The bodies 20B, 22B, 24B, and 26B are arranged concentrically and coaxially with the rotation shaft of the excavation mechanism 4 described in detail later, whereby the inner cylinders 20C, 22C, 24C, and 26C and the outer cylinders 20B, 22B, An annular space is formed between 24B and 26B. The support member is made of a rod-like or plate-like steel material, the number capable of supporting earth pressure acting on the outer cylinders 20B, 22B, 24B, 26B, with the central axis of the inner cylinders 20C, 22C, 24C, 26C as the center The inner cylinders 20C, 22C, 24C, and 26C and the outer cylinders 20B, 22B, 24B, and 26B are provided so as to radiate at appropriate intervals in the circumferential direction and the axial direction. The propulsion mechanism 18 is accommodated in an annular space between the inner cylinders 20C, 22C, 24C, and 26C and the outer cylinders 20B, 22B, 24B, and 26B.

  The rotating part shell 20 is rotatably connected to the first fixed part shell 22. Note that slipping can be improved by interposing a bearing or the like between the rotating portion shell 20 and the first fixed portion shell 22.

  Further, the front end portions of the inner cylindrical body 24C and the outer cylindrical body 24B of the second fixed portion shell body 24 are located between the inner cylindrical body 22C of the first fixed portion shell body 22 and the rear end portion of the outer cylindrical body 22B. It is housed in the space. With this configuration, the second fixed portion shell 24 is connected to the first fixed portion shell 22 so as to be slidable in the axial direction.

  Similarly, the front end portions of the inner cylinder body 26C and the outer cylinder body 26B of the third fixed portion shell body 26 are the rear end portions of the inner cylinder body 26C and the outer cylinder body 26B of the second fixed portion shell body 24, respectively. Is housed between. With this configuration, the third fixed portion shell 26 is connected to the second fixed portion shell 24 so as to be slidable in the axial direction. The connecting portion between the first fixed portion shell 22 and the second fixed portion shell 24 and the connecting portion between the second fixed portion shell 24 and the third fixed portion shell 26 are axially connected. A guide member for guiding the sliding may be provided.

  As shown in FIG. 2 to FIG. 4, the excavation mechanism 14 includes a cutter unit 30 including a plurality of drill bits formed in the tip surface portion 20 </ b> A of the rotating unit shell 20, and the first fixed unit shell 22. And a reduction gear 32 and a motor 34 arranged.

  A plurality of openings 36 are formed in the distal end surface portion 20 </ b> A of the rotating portion shell 20 at intervals in the circumferential direction, and the outside and the space 20 </ b> E in the rotating portion shell 20 communicate with each other through the openings 36. .

As shown in FIG. 4, the cutter unit 30 includes a plurality of roller bits 38 provided on the distal end surface portion 20A of the rotating portion shell 20 at intervals in the circumferential direction, and an edge of an opening 36 formed on the distal end surface portion 20A. And a drill bit 40 provided in the above.
As shown in FIG. 3, a pin rack 35 is attached to the rear end portion of the rotary shell 20.

  As shown in FIG. 3, a speed reducer 32 is connected to the motor 34 disposed in the first fixed portion shell 22, and a pinion 37 is attached to the speed reducer 32. A pinion 37 attached to the speed reducer 32 meshes with a pin rack 35 attached to the rotating part shell 20. As a result, when the motor 34 rotates, the torque is amplified through the speed reducer 32 and transmitted to the rotating part shell 20, and the rotating part shell 20 is centered on the central axis. Rotates relative to the fixed shells 22, 24, 26.

  Each roller bit 38 is disposed at a different position in the radial direction. Thereby, when the rotary shell 20 rotates in the circumferential direction, the trajectory through which each roller bit 38 passes becomes a concentric circle having substantially equal intervals in the radial direction, and uniform excavation can be performed regardless of the diameter.

  Further, the drill bit 40 is formed of a bit having a sharp tip, and is excavated so that the cutting surface cut by the roller bit 38 is flattened by the rotation of the rotating shell 20.

  As shown in FIG. 3 and FIG. 7, the excavated soil discharge mechanism 16 divides the space 20E in the rotating part shell 20 into a space 20E inside the rotating part shell 20 so as to divide the space 20E into a plurality of chambers 20F in the circumferential direction. The plurality of plate members 42 and the first fixed portion shell 22 are fixed to the front end portion of the inner cylindrical body 22C, and extend toward the rear end of the inner cylindrical body 20C of the rotating portion shell 20. The attached closing plate 44, and a jet nozzle (not shown) having a jet outlet provided on the surface of the front end face portion 20A of the rotary shell 20 so as to jet water toward the ground. Yes.

  Each plate member 42 is connected to the back surface of the tip portion 20A of the rotating portion shell 20 where the drill bit 40 is attached, and is inclined in the circumferential direction of the rotating portion shell 20 toward the rear. It is provided to do. In the present embodiment, the plate member 42 is provided so as to incline in the circumferential direction of the rotary shell 20 toward the rear. However, the present invention is not limited to this, and the plate member 42 may be provided perpendicular to the tip surface portion 20A. Good. Thus, by providing the plate member 42 in the rotating part shell 20, the rigidity of the rotating part shell 20 can be improved.

  The closing plate 44 has a predetermined clearance 20D between the rear end of the inner cylinder 20C of the rotating part shell 20 and the front end of the inner cylinder 22C of the first fixed part shell 22 from the lowermost part in the circumferential direction. Are provided so as to close the portion up to the height (in this embodiment, portions of about 120 ° on both sides in the circumferential direction from the lowermost portion).

  As shown in FIGS. 3, 5, and 6, the propulsion mechanism 18 is attached to a plurality of pairs of axial hydraulic jacks 50 provided so as to extend in the excavation progress direction, and the first fixed portion shell 22. And a plurality of radial hydraulic jacks 52 and a propulsion jack 56 attached to the rear of the third fixed portion shell 26.

  Each axial hydraulic jack 50 is arranged so as to extend in the direction of excavation, and one end is fixed to the first fixed part shell 22 and the other end is fixed to the second fixed part shell 24. Further, the propulsion jack 56 is provided horizontally along the inner surface of the outer cylindrical body 26B of the third fixed portion shell 26, and can extend toward the rear of the apparatus.

  As shown in FIG. 6, the radial hydraulic jack 52 is provided with a set of two hydraulic jacks arranged in a rectangular circumferential direction. In the present embodiment, six pairs of radial hydraulic jacks 52 are accommodated in the first fixed portion shell 22 at intervals in the circumferential direction.

An opening 22 </ b> D is formed in the outer cylinder body 22 </ b> B of the first fixed portion shell body 22 at a position corresponding to the radial hydraulic jack 52. The radial hydraulic jack 52 is fixed to a support member in the first fixed portion shell 22, and the other end is connected to a support plate 54 having substantially the same shape as the opening 22D formed in the outer cylindrical body 22B. Yes. With this configuration, when the radial hydraulic jack 52 extends, the support plate 54 protrudes toward the outer periphery.
The axial hydraulic jack 50, the radial hydraulic jack 52, and the propulsion jack 56 are connected to a control device (not shown), and hydraulic pressure is supplied by the control device.

  Further, inside the inner cylinders 22C, 24C, 26C of the first to third fixed part shells 22, 24, 26, in accordance with the height of the lower part of the inner cylinder 20C of the rotating part shell 20, A floor stand 58 is attached. An opening is formed in the floor 58, and a rock crusher 64, which will be described in detail later, is provided below the opening. In addition, a soundproof wall 59 that partitions the front and rear spaces is provided behind the excavator 10. Further, a wife formwork (shown in FIG. 8) is connected to the rear of the excavator 10.

Next, the tunnel excavation system of this embodiment will be described.
As shown in FIGS. 1 and 3, the tunnel excavation system 1 includes the excavator 10 described above, a backhoe 60 arranged inside the excavator 10, a breaker 62 for excavating the ground, and a rock crusher 64. And first and second belt conveyors 66A and 66B and a work base 68.

  The backhoe 60 and the breaker 62 are disposed on the tip of the gantry 68. The breaker 62 excavates an inner portion of the ground cutter unit 30 through the inner cylinder 20C of the rotating shell 20 according to the control of the operator. The backhoe 60 inputs the excavated soil discharged inside the apparatus by the excavated soil discharge mechanism 16 and the excavated soil excavated by the breaker 62 into the rock crusher 64.

  The rock crusher 64 is, for example, a biaxial roller type rock crusher, and is provided above the first belt conveyor 66A. The rock crusher 64 finely crushes the input rock, and drops the crushed fine rock and earth and sand downward.

  The first belt conveyor 66 </ b> A has a front end located below the rock crusher 64 and a rear end extending to the primary lining area 6. The first belt conveyor 66 </ b> A extends along the lower side of the gantry 68 while being supported by the gantry 68. The tip of the second belt conveyor 66B is located below the first belt conveyor 66B, and extends along the gantry 68 to the slipping work area 9.

  The gantry 68 is connected to the rear of the excavator 10 and includes wheels 68B. The gantry 68 can move in the direction of tunnel excavation as the excavator 10 advances. The gantry 68 is supported by, for example, a tunnel inner wall or a support member (not shown) that hangs down from an inner mold provided along the tunnel inner wall.

Hereinafter, a method for constructing a tunnel by the tunnel excavation system of this embodiment will be described.
In the present embodiment, the excavator 10 first excavates the ground 72 in an annular cross-section, and follows the excavator 10 to excavate the remaining ground 72 in the center by the breaker 62 to form a tunnel having a circular cross section. To construct.

  Hereinafter, a method for excavating the ground 72 in an annular cross section by the excavator 10 will be described.

  First, a method for propelling the excavation mechanism 14 by the propulsion mechanism 18 will be described. The propulsion operation is performed while rotating the cutter unit 30 of the excavating mechanism 14 about the axis of the excavating device 10 and discharging the excavated soil by the excavated soil discharging mechanism 16.

  In the following description, as shown in FIG. 8A, the description starts from a state in which the reaction force is applied to the already-attached inner mold 70 in a state where the propulsion jack 56 is contracted. First, in such a state, the radial hydraulic jack 52 is contracted, and the support plate 54 is retracted from the surrounding ground.

  Next, as shown in FIG. 8B, the propulsion jack 56 is extended with the reaction force applied to the inner mold. Thereby, the excavator 10 can be propelled. In this embodiment, only the propulsion jack 56 is extended, but the axial hydraulic jack 50 may be extended at the same time.

Next, the radial hydraulic jack 52 is extended and the surrounding ground is pressed by the support plate 54. While maintaining this state, the propulsion jack 56 is contracted. Then, as shown in FIG. 8C, a new inner mold 70 is installed in the space between the rear end of the propulsion jack 56 and the already attached inner mold 70.
By repeating the above steps, the excavating mechanism 14 can be advanced forward and the excavator 1 can be propelled.

Along with the above propulsion work, the cutter unit 30 is rotated to excavate the ground, and excavated soil generated by excavation is sent to the rear of the apparatus.
That is, the motor 34 of the excavation mechanism 14 is rotated in a state where the cutter unit 30 is pressed against the ground by the propulsion mechanism 18. The rotational force of the motor 34 is transmitted to the speed reducer 32, the torque is amplified, and the rotating part shell 20 is rotated via the pinion 37 and the pin rack 35. When the rotating part shell 20 rotates, first, the ground is excavated in a sawtooth shape by the roller bit 38 of the cutter part 30, and the surface irregularities are scraped by the drill bit 40. Thereby, the ground can be excavated in an annular shape.

  The excavated soil produced by excavating the ground with the cutter unit 30 is agitated with the water sprayed from the jet nozzle, and the fluidity is improved. Then, the excavated soil is accommodated in the chamber 20F in the rotating part shell 20 through the opening 36 formed in the distal end surface part 20A of the rotating part shell 20. The excavated soil accommodated in the chamber 20F is sent rearward by the plate member 42 attached in the rotating part shell 20 as the rotating part shell 20 rotates, and the space inside the excavator 10 (from the gap 20D) That is, it is discharged into the inner cylinder 22C.

  At this time, the closing plate 44 causes the gap 20D between the rear end of the inner cylindrical body 20C of the rotating portion shell 20 and the front end of the inner cylindrical body 22C of the first fixed portion shell 22 to be maximized in the circumferential direction. Since the part from the lower part to the predetermined height is closed, the excavated soil in the chamber 20F rotated to the predetermined height falls on the closing plate 44. As a result, the excavated soil carried to the inside of the apparatus accumulates downward, and the rear end of the inner cylinder 20C of the rotating part shell 20 and the front end of the inner cylinder 22C of the first fixed part shell 22 It is possible to prevent the gap 20D between them from being closed.

  In parallel to the preceding excavation work, the ground 72 inside the portion excavated in an annular shape by the excavator 10 is excavated by the breaker 62. Then, the excavated soil discharged to the inside of the apparatus by the excavated soil discharge mechanism 16 and the excavated soil excavated by the breaker 62 are input to the rock crusher 64 by the backhoe 60.

  By putting the excavated soil into the rock crusher 64, the rock contained in the excavated soil is finely crushed and falls onto the first conveyor 66A. The excavated soil and rock that have fallen on the first conveyor 66A fall on the second conveyor 66B from the rear end of the first conveyor 66A and are carried to the slipping area 9 by the second conveyor 66B. The excavated soil and rocks transported to the drainage area 9 are discharged out of the tunnel by a dump truck or the like.

In parallel with the above process, concrete is placed in the space between the inner mold 70 and the tunnel surface formed by the excavator 10 in the primary lining area 6.
As described above, the excavator 10 includes the annular wife frame 80 connected to the rear portion, and the inner mold frame 70 is disposed so as to contact the inner surface of the wife mold frame 80. Yes. The inner mold 70 may be a telescopic pit type.

  When the excavator 10 advances, the wife formwork 80 advances with the excavator 10, so that a gap is generated between the concrete already placed. Concrete is placed in this space through a concrete injection hole (not shown) formed in the wife formwork 80.

Then, after the primary lining area 6, the inner mold frame 70 at the position where the placed concrete is hardened is removed, and the removed inner mold frame 70 is moved to the time when the excavator 10 is advanced as described above. And installed between the propulsion jack 56 and the most advanced inner mold 70.
By repeating the above steps, concrete is placed on the tunnel surface.

In parallel with the above process, the invert 90 is installed in the tunnel in the invert work area 8.
A tunnel can be constructed by performing the above-described steps.

  As described above, according to the present embodiment, the excavated soil generated by excavating the ground with the cutter unit 30 passes through the opening 36 formed in the distal end surface of the rotating unit shell 20 and the rotating unit shell 20. Since it is accommodated in the inner space 20E and discharged into the internal space of the excavation apparatus 10 through the gap 20D formed at the rear of the space 20E, a mud pipe or the like is not used as in the prior art. The occurrence of clogging can be suppressed.

  Further, since the space 20E in the rotating part shell 20 is divided into a plurality of chambers 20F in the circumferential direction by a plurality of plate members 42 inclined rearward in the circumferential direction of the rotating part shell 20, the rotating part With the rotation of the shell 20, the plate material 42 rotates, so that the excavated soil accommodated in the space 20 </ b> E is sent toward the gap 20 </ b> D.

  Moreover, the rock crusher 64 provided inside the excavation apparatus 10 is provided, the excavation soil generated by excavating the ground by the breaker 62, and the inside of the excavation apparatus 10 from the space 20E in the rotating shell 20 through the gap 20D. The rock contained in the excavated soil discharged to can be finely crushed by the rock crusher 64. As a result, even if a large rock that may hinder smooth conveyance by the belt conveyors 66A and 66B is included in the excavated soil, it can be finely crushed by the rock crusher 64, and therefore excavated by the belt conveyors 66A and 66B. The soil can be transported smoothly.

  Further, a gantry 68 connected to the rear of the excavator 10 is provided, the gantry 68 is movable in the excavation progress direction, and the belt conveyors 66A and 66B are supported by the gantry 68. The belt conveyors 66A and 66B and the gantry 68 can move together.

  In the present embodiment, the breaker is used as the excavator disposed inside the excavator, but the present invention is not limited to this as long as it is a heavy machine capable of excavating the ground.

DESCRIPTION OF SYMBOLS 1 Tunnel excavation system 4 Tunnel excavation area 6 Primary lining area 8 Invert work area 10 Sludge work area 12 Shell body 14 Excavation mechanism 16 Excavation soil discharge mechanism 18 Propulsion mechanism 20 Rotating part shell 22 First fixed part shell 24 Second fixed part shell 26 Third fixed part shell 20B, 22B, 24B, 26B Outer cylinder 20C, 22C, 24C, 26C Inner cylinder 30 Cutter part 36 Opening 38 Roller bit 40 Drilling bit 42 Plate material 44 Closure plate 50 Axial hydraulic jack 52 Radial hydraulic jack 56 Propulsion jack 60 Backhoe 62 Breaker 64 Rock crusher 66A, 66B Belt conveyor 68 Mounting base

Claims (4)

A tunnel excavation system for excavating a tunnel in the ground,
A cylindrical excavator for excavating the ground in an annular cross section;
A heavy excavator for excavating the ground of an inner portion of a portion that is disposed in an inner space of the cylindrical excavator and is excavated in an annular cross section by the excavator;
A conveying means that extends rearward from within the interior space of the excavator and conveys excavated soil of the excavator backward,
The drilling rig is
A cylindrical shell including a cylindrical rotating shell provided at the tip of the excavation direction, and a cylindrical fixed shell connected to the rear of the rotating shell;
A digging mechanism including a cutter part formed on a tip surface of the rotating part shell, and a rotating mechanism for rotating the rotating part shell relative to the fixed part shell;
A propulsion mechanism for propelling the rotating part shell in the direction of excavation,
An opening is formed in the front end surface of the rotating part shell, an accommodation space is formed in the rotating part shell, and excavated soil excavated by the excavating mechanism is accommodated in the accommodation space through the opening.
A gap is formed between the rotating part shell and the fixed part shell on the inner surface of the excavator, and the accommodation space and the internal space of the excavator are communicated through the gap, and the accommodation The excavated soil accommodated in the space is discharged into the internal space of the excavator through the gap,
The conveying means conveys excavated soil generated by excavating the ground by the excavating heavy machine toward the rear together with excavated soil discharged from the housing space through the gap into the internal space of the excavator. Tunnel drilling system. The inside of the housing space is divided into a plurality of chambers in the circumferential direction by a plurality of plate members.
The tunnel excavation system according to claim 1. Furthermore, a crusher provided inside the excavator is provided,
The excavated soil generated by excavating the ground with the excavator heavy machine and the excavated soil discharged into the internal space of the excavator from the accommodation space through the gap are crushed by the crusher the rocks contained in the excavated soil. , Transported backward by the transport means,
The tunnel excavation system according to claim 1 or 2. Furthermore, a pedestal connected to the rear of the excavator is provided,
The mount is movable in the direction of excavation;
The transport means is supported by the gantry.
The tunnel excavation system according to any one of claims 1 to 3.

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