JP3471264B2 - Tunnel construction method and shield machine used for it - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel construction method and a shield machine used in the tunnel construction method.

[0002]

2. Description of the Related Art When a shield machine is excavated from a starting shaft to construct a large-diameter tunnel and a small-diameter tunnel, as shown in FIG. 21, separate shield machines 110 and 111 having different diameters are installed from a starting shaft 118. A construction method of constructing a large diameter tunnel 112 and a small diameter tunnel 113 by respectively excavating, and a parent-child shield excavation having a small-diameter child shield excavator 115 in a large-diameter parent shield excavator 114, as shown in FIG. There is a construction method of constructing a large diameter tunnel 112 and a small diameter tunnel 113 using the machine 116.

When constructing large and small tunnels using the parent-child shield excavator 116, first, the parent shield excavator 114 is constructed.
The excavation shaft 117 is excavated and formed at a predetermined destination of, and the parent-child shield excavator 116 is excavated from the starting shaft 118 to the arrival shaft 117 in a state where the parent and child are combined.

Then, the child shield machine 115 is pulled out forward of the parent shield machine 114 in the direction of travel and moved into the reaching shaft 117, and the child shield machine 115 is moved above the reaching shaft 117 by a crane (not shown). Raise to.

The child shield excavator 115 is launched to a vertical shaft 118.
Returning to the inside, a small-diameter tunnel 113 is constructed using the child shield excavator 115.

[0006]

By the way, as shown in FIG. 21, when constructing large and small tunnels 112 and 113 by using separate shield excavators 110 and 111, two shield excavators are used. If the excavation length of one side tunnel is short, there is a problem that the construction cost is high.

Further, as shown in FIG. 22, when the large and small tunnels 112 and 113 are constructed by using the parent-child shield excavator 116, a part of the parent-child shield excavator 116 which constructs the large diameter tunnel 112 is diverted. Although the shield machine has a low cost, there is a problem that the construction cost becomes high as a whole because the reaching shaft 117 has to be excavated.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above problems and provide a tunnel construction method capable of inexpensively constructing a large diameter tunnel and a small diameter tunnel from a starting shaft and a shield machine used therefor.

[0009]

SUMMARY OF THE INVENTION The present invention in order to achieve the above object, in the center of the large-diameter shield machine, extractable in instrumentation separatist possible small-diameter shield portion rearward
And supports the small-diameter shield excavation part and also has a small-diameter
Provides a seal between the shield machine and the large-diameter shield machine.
Install the central support member from the rear side of the small-diameter shield excavation part.
After forming the excavator, a large-diameter tunnel is constructed using the excavator, and then the central support member of the excavator is mounted inside the machine.
Removing the side, back to the originating proceeds pit position via the large diameter tunnel pull the small-diameter shield portion inboard
After that, the small-diameter shield digging part has a hood of approximately the same diameter.
Small-diameter shield machine special member is attached to seal small-diameter
Form a machine and use the small- diameter shield machine to make a small machine.
It is to build a caliber tunnel.

In addition, a small-diameter shield excavation part that can be separated and separated can be extracted rearward in the center of the large-diameter shield excavator.
Noh, and supports the small-diameter shield excavation
Between the small diameter shield machine and the large diameter shield machine
Install the support member in the central part on the rear side of the small-diameter shield excavation part.
To form a machine and use this machine to make a large
After constructing the diameter tunnel, the central support member of the machine
Remove the inboard side, after returning to the calling proceeds pit position via the large diameter tunnel pull the small-diameter shield portion inboard side, of substantially the same diameter to the small-diameter shield portion off
A small-diameter shield machine such as a cord is attached to a small-diameter machine.
A shield machine is formed, and a small-diameter tunnel is constructed from a starting shaft using the small-diameter shield machine .

The small-diameter shield excavation section is provided so that it can be pulled out to the small-diameter cutter head provided in the center of the cutter of the large-diameter shield excavator and the shield frame of the large-diameter shield excavator, and the small-diameter cutter head is It consists of a ring-shaped girder part that supports and drives the drive device.After returning to the starting shaft position, the small-diameter shield excavation part has a hood of approximately the same diameter, a small-diameter seal for an earth removing device, etc. <br / > Attach a special machine member to make a small-diameter shield machine,
The small-diameter shield machine may be used to construct a small-diameter tunnel.

Further, at the center of the large-diameter shield machine,
Small-diameter shield excavation part that can be separated and separated can be pulled out backward
Noh, and supports the small-diameter shield excavation
Between the small diameter shield machine and the large diameter shield machine
Install the support member in the central part on the rear side of the small-diameter shield excavation part.
To form a machine and use this machine to make a large
After constructing the diameter tunnel, the central support member of the machine
To the inside of the machine, and the small-diameter shield excavation part
Draw out the small-diameter shield excavation part to the large-diameter tunnel.
Return to the starting shaft position using the rail.
After that, the small-diameter shield digging part has a hood of approximately the same diameter.
Small-diameter shield machine special member is attached to seal small-diameter
Form a machine and use the small-diameter shield machine to make a small machine.
It is to build a caliber tunnel. The rail may be a rail for transferring a trolley for transporting a segment, a hydraulic unit trolley, or the like when a large-diameter tunnel is constructed.

Further, the shield machine used in the above-mentioned tunnel construction method is provided with a small-diameter cutter of a small-diameter shield excavator which can be separately and independently provided at the center of the cutter of the large-diameter shield excavator. The frame has a ring-shaped girder part that can be pulled out, and the girder part rotatably supports the small-diameter cutter and its drive device.The small-diameter shield excavator is installed on the shield frame of the large- diameter shield excavator. Part to the inside of the machine
A rail for pulling out the girder part for sending out is provided, and further,
On the rear side of the girder part, the shield frame and the girder part
It is preferable to provide a central portion supporting member for sealing the gaps and supporting the girder portion on the shield frame.

The outer diameter of the small-diameter cutter is preferably smaller than the outer diameter of the girder portion. Also,
Large-diameter shield A small-diameter seal is placed in the center of the excavator cutter.
A large-diameter cutter with a small-diameter
Can be extracted into the shield frame of the diameter shield machine
A ring-shaped girder section is provided, and a small-diameter
Rotatably support the drive and install its drive.
On the shield frame of the large-diameter shield machine,
Gas for pulling out the above small-diameter shield excavation section to the inside of the machine
A rail for pulling out the girder part is provided,
Seal between the shield frame and the girder part on the rear side.
And for supporting the girder part on the shield frame
The central support member is provided, the hydraulic unit carriage and the upper driving the <br/> large diameter shield machine in the large-diameter shield machine
Serial provided movably in the hydraulic unit carriage and separate rail each carriage to separate independent driving the small-diameter shield portion, may be formed a segment conveying space between the two carriages.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, in constructing a tunnel according to the present invention, an excavator in which a large-diameter shield excavator 1 is integrated with a small-diameter shield excavator 2 which can be separated and independent. To use.

First, the large-diameter shield machine 1 will be described.

The large-diameter shield machine 1 has a hood 3a that forms an outer shell, and has a large-diameter shield main body 3 that is formed to be bendable in the middle, and a large-diameter shield main body 3 provided on the large-diameter shield main body 3. And a large-diameter cutter head 4 for excavating the front of the excavation direction.

The large-diameter shield body 3 is composed of a front body 5 located on the front side in the excavation direction and a rear body 6 flexibly connected to the rear end of the front body 5.

The front body 5 is formed in a substantially cylindrical shape, and a ring-shaped shield frame 7 is provided on the front portion of the front body 5. The shield frame 7 is formed by assembling steel plates, and accommodates a small-diameter shield excavation portion 2 described later in a central opening 8 formed at the center.

On the inner peripheral surface 9 of the shield frame 7, there is provided a girder portion pull-out rail 10 for slidably supporting a small-diameter shield excavation portion 2 which will be described later.

As shown in FIGS. 1, 5 and 6, the girder portion pull-out rail 10 is made of two steel members extending in the axial direction, and is parallel to the lower part of the inner peripheral surface 9 of the shield frame 7, and It is provided separately.

Between the inner peripheral surface 9 of the shield frame 7 and the small-diameter shield digging portion 2, a plurality of steady rests 59 for holding the small-diameter shield digging portion 2 are sandwiched.
The steady rest 59 is made of a wedge-shaped member, and is arranged so as to hold both sides of the small-diameter shield excavation portion 2 and the upper two points at substantially equal intervals.

Further, the shield frame 7 has a first hydraulic motor 11 for driving a large-diameter cutter head 4 which will be described later, and mud soil in a cutter chamber 12 formed behind the large-diameter cutter head 4. A first mud pipe 13 for feeding mud for the purpose and a first mud pipe 14 for taking the mud in the cutter chamber 12 and sending it to the ground are provided, and a first mud pipe is provided in the shield frame 7. An internal gear 15 as a power transmission means for receiving the driving force of the hydraulic motor 11 and transmitting it to the large diameter cutter head 4 is housed.

The internal gear 15 is housed concentrically in the shield frame 7 and is rotatably supported.
The internal gear 15 is provided integrally with the large diameter cutter head 4 via a connecting member 16 extending forward.

The first hydraulic motor 11 is integrally provided with a pinion 18 on the drive shaft 17, and is provided on the shield frame 7 so that the pinion 18 projects into the shield frame 7 and meshes with the internal gear 15. ing.

Further, the rear body 6 is provided with an erector 19, which is adapted to receive a segment (not shown) sent through a large-diameter tunnel 47 formed in the rear and to assemble it to the existing segment 20. ing.

As shown in FIGS. 1 and 2, the large-diameter cutter head 4 is formed in a ring plate shape when viewed from the front, and a small-diameter cutter head 21, which will be described later, is located at the center.

A plurality of cutter bits 22 are provided on the front surface of the large diameter cutter head 4. In particular, a plurality of boundary bits 23 are provided on the inner peripheral edge of the large-diameter cutter head 4 facing the small-diameter cutter head 21 and extend inward in the radial direction to restrict the forward movement of the small-diameter cutter head 21.

At the outer peripheral edge of the large-diameter cutter head 4, the outermost peripheral bits 24, 25 projecting outward in the radial direction.
And a copy cutter 26 are provided.

As shown in FIGS. 1, 2, and 3, the small-diameter shield excavator 2 includes a small-diameter cutter head 21 located at the central opening of the large-diameter cutter head 4 and a large-diameter shield excavator 1. The ring-shaped girder portion 27 is provided in the shield frame 7 so as to be pulled out.

The small-diameter cutter head 21 is formed in a circular shape when viewed from the front, and is provided with a plurality of cutter bits 22 on the front surface. The small-diameter cutter head 21 has a central protrusion 29 protruding in the excavation direction at the center for centering. A rotary shaft 30 extending rearward is provided at the center of the small-diameter cutter head 21.

The rear end of the rotary shaft 30 is rotatably supported by a girder portion 27, which will be described later, and the power is transmitted via a gear 31 provided in the middle. The small-diameter cutter head 21 is used for the shield frame 7
The diameter is smaller than that of the central opening 8, so that the central opening 8 can easily pass backward.

The girder portion 27 is a small-diameter cutter head 21.
Second hydraulic motor 32 that supports and drives the same.
For supporting a small-diameter cutter head 21
It has a larger diameter. A gear 31 provided on the rotating shaft 30 is housed in the center of the girder portion 27, and the gear 31 is adapted to be rotated by the power of a second hydraulic motor 32 described later.

The second hydraulic motor 32 is provided on the girder portion 27 so that the pinion 30a provided on the drive shaft (not shown) meshes with the gear 31.

In the girder portion 27, an agitator 33 for stirring the mud in the cutter chamber 12 behind the small diameter cutter head 21 and a second agitator for feeding the mud into the cutter chamber 12 are provided.
A part of the mud pipe 34 and a part of the second mud pipe 35 for taking in the mud in the cutter chamber 12 and sending it to the ground are provided.

The shield frame 7 is provided with a central support member 36 for supporting the girder portion 27.

The central portion support member 36 is a member for fixing the girder portion 27 of the small-diameter shield excavation portion 2 to the shield frame 7, and the central opening portion 8 of the shield frame 7.
It is formed in an annular shape having an outer diameter that fits inside.

Specifically, the central support member 36 is fitted into the central opening 8 from the rear of the girder portion 27 and fixed to the girder portion 27, and is also fixed to the shield frame 7. The central portion support member 36 is fixed by bolts so that the central portion support member 36 can be easily removed when the small-diameter shield excavation portion 2 is pulled out to the inside of the machine.

Further, the central portion support member 36 is provided with a central portion seal 37 for preventing muddy water in the cutter chamber 12 from leaking into the machine. Center seal 37
Is formed of an elastic material such as rubber or synthetic resin, and is embedded and fixed to the outer periphery and the front end of the central support member 36. The girder portion 27 and the shield frame 7 are liquid-tightly attached.

Further, as shown in FIGS. 7 and 8, a plurality of rails 39, 40, 41 extending from the starting shaft 38 are laid inside the large-diameter shield machine 1, and the first hydraulic motor 11 and the first hydraulic motor 11 are installed. 2 Hydraulic unit carriages 42 and 43 for supplying hydraulic pressure to hydraulic equipment such as the hydraulic motor 32 are movably arranged on rails 39, 40 and 41.

The hydraulic unit carriages 42 and 43 include a dedicated carriage 42 for driving the hydraulic equipment of the large-diameter shield excavator 1 such as the first hydraulic motor 11 and a hydraulic equipment of the small-diameter shield excavator 2 such as the second hydraulic motor 32. Shared trolley 4 to drive
It is separated into 3 and independent, and each is a separate rail 3
It is movably arranged on 9, 41.

The rails 39 and 41 are laid parallel to each other and spaced apart from each other, and the segment 20 is provided between the rails 39 and 41, that is, between the hydraulic unit carriages 42 and 43.
A segment transport space 45 for transporting the is formed.

In the segment transfer space 45, rails 40 are laid for traveling a segment carriage 46 on which the segment 20 is placed and carried.

Next, the construction method and operation will be described.

As shown in FIG. 13, a large-diameter tunnel 47 connecting the starting shaft 38 to the existing tunnel 44 is constructed, and at the same time, another small-diameter tunnel 4 from the starting shaft 38.
When constructing No. 8, as shown in FIG. 7, the large-diameter shield machine 1 is carried into the starting shaft 38, and is excavated from the starting shaft 38 on a predetermined route.

When excavating the large diameter shield machine 1, the first hydraulic motor 11 is driven to rotate the large diameter cutter head 4, and the second hydraulic motor 32 is driven to rotate the small diameter cutter head 21. The propulsion jack 49 having its rear end applied to the segment 20 assembled in the large-diameter tunnel 47 is extended to propel it while excavating in the excavation direction. In addition, in parallel with this, mud is injected into the cutter chamber 12 through the first mud sending pipe 13 to turn mud in the cutter chamber 12 into mud while the mud in the cutter chamber 12 is removed from the first mud pipe 14 Suction through and send to the ground.

While the large-diameter shield machine 1 is being excavated, the inside of the cutter chamber 12 is filled with mud, and the girder portion 2
Although the mud also intrudes into the gap between the shield frame 7 and the shield frame 7, the central support member 36 is provided on the rear side of the girder portion 27, and the outer periphery and front end of the central support member 36 have central seals 37, 37. Since the mud does not enter the inside of the machine from between the girder portion 27 and the center support member 36 or between the shield frame 7 and the center support member 36, the mud in the cutter chamber 12 enters the machine. It does not infiltrate.

In this way, as shown in FIG. 7, the large-diameter tunnel 47 is constructed while excavating to the destination without the reaching shaft.

As shown in FIG. 9, when the large-diameter shield machine 1 reaches the destination, first, the cutter heads 4, 2 are cut.
1 Dosing chemicals to the sand D in front of it to prevent water from coming out.
Harden. Next, the hydraulic unit carriages 42 and 43 are reversely run toward the starting shaft 38 and once pulled up to the ground.

Then, the first mud pipe 13 and the first mud pipe 14
Is removed from the shield frame 7 and the rear workbench 5 is removed.
0 is removed to secure a working space in the front body 5. After that, the central support member 36 is removed from the shield frame 7 and the girder portion 27 and pulled out into the large diameter tunnel 47. As a result, the small-diameter shield excavation portion 2 is in a state of being freely movable.

When this is done, the small-diameter shield excavation section 2
A carrier truck 58 for transferring the vehicle to the starting shaft 38 is prepared in the large-diameter shield machine 1, and the girder portion pull-out rail 10 is added rearward to a position where the carrier truck 58 is located.
A lubricant such as mechanical oil is applied to the girder portion pull-out rail 10 in advance.

Then, the steady rest 59 sandwiched between the small-diameter shield excavation portion 2 and the shield frame 7 is removed, and the small-diameter shield excavation portion 2 is pulled inward. The small-diameter shield excavation portion 2 slides on the girder portion pull-out rail 10 and is pulled out to the inside of the machine.

At this time, the rail 10 for pulling out the girder portion
Are spaced apart from each other, and the small-diameter shield excavation portion 2 is formed in a circular shape in a front view, so that the small-diameter shield excavation portion 2 is stably pulled out on the girder portion pull-out rail 10. In addition, the rail 1 for pulling out the girder part
Since the lubricant is applied on the 0, the small-diameter shield excavation portion 2 is easily moved with a small force.

When the small-diameter shield excavation section 2 is moved to the vicinity of the carriage 58 in this way, the small-diameter shield excavation section 2 is lifted by a hoist (not shown) or the like,
As shown in 0, it is moved onto the carriage 58.

After this, as shown in FIG.
8 is run backwards to the starting shaft 38, and the small-diameter shield excavation section 2 is returned to the starting shaft 38. At this time, the carriage 58
Runs on rails 39, 40, 41 for transferring the trolley 46 for segment transfer, the dedicated trolley 42, the common trolley 43, and the like.

Then, only the common carriage 43 is returned into the large diameter tunnel 47, and the direction of the small diameter shield excavation portion 2 is changed to the direction of the small diameter tunnel 48 to be formed.

Thereafter, as shown in FIGS. 3, 4 and 12, the outermost peripheral bits 51, 5 are formed in the small diameter shield excavation portion 2.
2, the hood 53, the rear girder part 54, the tail part 55, the erector 56, and the earth discharging device (the first mud pipe 13 and the first mud pipe 14) and the like are attached to the small diameter shield machine dedicated members
A small-diameter shield machine 57 is formed.

After the small-diameter shield excavator 57 is formed, the rail for the common carriage and the rail for the segment carriage are formed side by side in the small-diameter shield excavator 57, and the common carriage is formed in the small-diameter shield excavator 57. It is moved and connected to the second hydraulic motor 32 or the like. Then, as shown in FIG. 13, the small-diameter tunnel 48 is excavated to construct the small-diameter tunnel 48.

As described above, the excavator in which the small-diameter shield excavator 2 which is separable and independent is integrated in the center of the large-diameter shield excavator 1 is carried into the starting shaft 38, and the excavator is advanced. After constructing a large-diameter tunnel 47 using, the small-diameter shield excavation part 2 of the excavator is pulled out to the inside of the machine and returned to the starting shaft 38 position via the large-diameter tunnel 47 and the small-diameter shield excavation part 2 Since a small-diameter tunnel 48 is constructed from the starting shaft 38 by using the
Therefore, the large diameter tunnel 47 and the small diameter tunnel 48 can be constructed at low cost.

Further, the small-diameter shield excavation section 2 has a large-diameter cutter head 4 which is a cutter of the large-diameter shield excavator 1.
Of the small-diameter cutter head 21 and the shield frame 7 of the large-diameter shield machine 1, which supports the small-diameter cutter head 21 and a second hydraulic motor 32 which is a drive device thereof. It is composed of a ring-shaped girder portion 27 for supporting, and after returning to the position of the starting shaft 38, the hood 53 is attached to the small-diameter shield excavation portion 2.
In order to build a small diameter tunnel 48 with the small diameter shield excavator 57, a small diameter shield excavator 57 is provided by attaching members dedicated to the shield machine such as the second mud pipe 34 and the second sludge pipe 35. Even in the state of the large-diameter shield machine 1, a sufficient working space can be ensured inside the machine, and the small-diameter shield machine 2 can be easily pulled out from the large-diameter shield machine 1.

When constructing the large-diameter tunnel 47, the small-diameter shield excavation section 2 is placed on the carrier truck 58, and rails 39, 40, 41 for transporting the segment carrier truck 46, hydraulic unit trucks 42, 43, etc. are used. Start shaft 3
Since it is returned to 8, the track width can be wide, and the small-diameter shield excavation portion 2 can be stably transported.

Further, the small-diameter cutter head 21 of the small-diameter shield excavator 2 is provided in the center of the large-diameter shield excavator 1 at the center of the large-diameter cutter head 4 so as to be separable from the large-diameter shield excavator 1. A ring-shaped girder portion 27 is provided so that it can be pulled out, and the girder portion 27 rotatably supports the small-diameter cutter head 21 and a second hydraulic motor 32, and the shield frame 7 of the large-diameter shield machine 1 is provided . the provided gas chromatography reader unit drawer rail 10,
Furthermore, the girder portion 27 to the shield frame 7 with the shield frame 7 and gas chromatography reader unit 27 to seal therebetween
Since the central portion support member 36 for supporting the large-diameter shield excavator 1 is securely provided in the small-diameter shield excavation unit 2.
The small-diameter shield excavator 2 can be easily pulled out from the large-diameter shield excavator 1.

[0064] Then, the outer diameter of the small-diameter cutter head 21, because of the smaller than the outer diameter of the gas over the reader unit 27 can be drawn easily small-diameter shield portion 2 from the large-diameter shield machine 1.

Further, the dedicated carriage 42 for driving the large-diameter shield excavator 1 and the common carriage 43 for driving the small-diameter shield excavator 2 are separated and independent, and separate rails 3 are used.
Since the segment conveyance space 45 is formed between the carriages 42 and 43, the hydraulic unit for rotationally driving the small-diameter cutter head 21 is easily diverted to the small-diameter shield machine 57. It is possible,
The work cost can be reduced.

Since the large-diameter cutter head 4 and the small-diameter cutter head 21 are separated and driven by different driving sources, the required equipment torque particularly on the large-diameter cutter head 4 side can be reduced, The support structure for the large diameter cutter head 4 can be simplified and downsized.

Next, another embodiment will be described.

A large-diameter shield machine 60 shown in FIGS. 15 and 16 and a small-diameter shield machine 61 shown in FIG.
Is a modification of the above-described large-diameter shield machine 4 and small-diameter shield machine 21 in order to carry the earth and sand on the screw conveyors 62 and 63.

As shown in FIGS. 15 and 16, the large-diameter shield machine 60 is equipped with an eccentric multi-axis driven large-diameter cutter head 64 in order to secure an installation space for the large screw conveyor 62. Pipe 13 and first sludge pipe 14
Instead of this, the large screw conveyor 62 conveys the earth and sand.

The large-diameter cutter head 64 has two large and small ring-shaped frame members 65 and 66 arranged concentrically and connected to each other, and a large number of cutter bits 67 are provided on the frame members 65 and 66. is there. The large-diameter cutter head 64 has an eccentric shaft 8 that extends rearward and is eccentric in the middle.
One end of 9 is rotatably connected, and the third hydraulic motor 68 is connected to the other end of the eccentric shaft 89.

A boundary bit 70 extending toward the small-diameter cutter head 69 is provided at the inner peripheral edge of the small frame member 66 located inside, and a small diameter for the large-diameter shield machine 60. Movement of the shield digging portion 71 in the digging direction is restricted.

The large screw conveyor 62 has a suction port 72.
Is located in the lower part of the cutter chamber 73, and the large diameter shield machine 6
It is provided so as to be inclined within 0. The outer cylinder portion 74 forming the outer shell of the large screw conveyor 62 is integrally fixed to the shield frame 75 near the front end, and is detachably provided near the rear side of the fixed portion via a flange 76. .

As shown in FIGS. 15, 16 and 17,
The small-diameter cutter head 69 is formed in a circular shape when viewed from the front, and is provided with a plurality of cutter bits 77. Also,
The small-diameter cutter head 69 has a central protrusion 78 protruding in the excavation direction for centering, and a rotary shaft 79 extending rearward is provided at the center of the small-diameter cutter head 69.

The rotating shaft 79 is a large-diameter shield machine 60.
The shield frame 75 is rotatably supported by a ring-shaped girder portion 80 provided so as to be pulled out, and power is transmitted via a gear 81 provided in the middle. The small-diameter cutter head 69 is formed to have a smaller diameter than the central opening 82 of the shield frame 75 so that the small-diameter cutter head 69 can easily pass backward through the central opening 82.

The small-diameter cutter head 69 is provided with a stirring plate 84a for stirring the inside of the cutter chamber 73 so as to extend rearward. The stirring plate 84a rotates together with the small-diameter cutter head 69. The sand in the cutter chamber 73 is agitated.

An outer shell 83 at the tip of the small screw conveyor 63 is attached to the girder portion 80 so that the small screw conveyor 63 can be attached later.

The operation will be described.

The large-diameter shield machine 60 is launched to the vertical shaft 38.
When the third hydraulic motor 68 is driven so as to be driven from the bottom, the eccentric shaft 89 is rotated and the large diameter cutter head 64 is swung. Further, when the second hydraulic motor 32 is driven, the rotating shaft 79 is rotated and the small diameter cutter head 69 is also rotated.

Then, when the large screw conveyor 62 is driven while the propelling jack 49 is extended, the large diameter cutter head 64 and the small diameter cutter head 69 excavate the front soil and send it into the cutter chamber 73. The earth and sand in the cutter chamber 73 is sent into the machine through the large screw conveyor 62,
It is sent to the starting shaft 38.

In this way, after excavating to the destination without the vertical shaft and constructing the large-diameter tunnel 47, the small-diameter shield excavation section 71 is pulled out to the inside of the machine by the same procedure as in the above-mentioned embodiment, and the carriage is carried. (Not shown) is used to return to the starting shaft 38.

In the starting shaft 38, toward the small-diameter tunnel 48 in which the small-diameter shield excavation portion 71 is to be formed, the outermost peripheral bit 84 and the hood 8 are provided in the small-diameter shield excavation portion 71.
5, small-diameter shield machine dedicated members such as the rear girder portion 86, tail portion 87, erector 88, and small screw conveyor 63 are attached to form the small-diameter shield machine 61.

After the small-diameter shield machine 61 is formed, the small-diameter tunnel 4 is manufactured in the same procedure as the above-described embodiment.
Build 8.

As described above, since the large-diameter cutter head 64 is of the eccentric multi-axis drive and swing type, the power transmission system can be made compact and the large screw conveyor 62 can be installed.

Still another embodiment will be described.

A large-diameter shield machine 90 shown in FIGS. 18 and 19, and a small-diameter shield machine 91 shown in FIG.
Is a small diameter cutter head 92 and a large diameter cutter head 93.
The large-diameter shield excavator 4 and the small-diameter shield excavator 21 are modified so as to be driven by a common hydraulic motor.

As shown in FIGS. 18 and 19, in the large-diameter shield machine 90, the large-diameter cutter head 93 is integrally attached to the small-diameter cutter head 92, and the small-diameter cutter head 92 is rotated by the fourth hydraulic motor 94. By driving, the large-diameter cutter head 92 and the large-diameter cutter head 93 are rotationally driven.

The large-diameter cutter head 93 is formed in a ring plate shape as viewed from the front, and has an inner peripheral end having a small-diameter cutter head 9
It is integrally attached to the outer peripheral end of 2 via a bolt.

As shown in FIGS. 18, 19 and 20,
The small-diameter cutter head 92 is integrally provided with an internal gear 95 as a power transmission means. The internal gear 95 is provided so as to extend rearward from the small-diameter cutter head 92 via a connecting member 96 extending rearward, and is accommodated in the girder portion 97 concentrically and rotatably supported.

The pinion 99 provided on the drive shaft 98 of the fourth hydraulic motor 94 is meshed with the internal gear 95, and by rotating the fourth hydraulic motor 94, the internal gear 95 and the small-diameter cutter are also attached. The head 92 and the large diameter cutter head 93 are rotated.

The operation will be described.

A large-diameter shield machine 90 is launched to a vertical shaft 38.
When the fourth hydraulic motor 94 is driven so as to be advanced from, the driving force is transmitted to the small diameter cutter head 92 via the internal gear 95, and the small diameter cutter head 92 and the large diameter cutter head 93 are integrally rotated. . Then, the cutter chamber 1 is passed through the mud pipe 13 while extending the propulsion jack 49.
While sending the mud into 06, the mud exhaust pipe 14 sucks the mud in the cutter chamber 106 and sends it to the ground.

In this way, after excavating to the destination without the reaching shaft and constructing the large-diameter tunnel 47, the large-diameter cutter head 93 is removed from the small-diameter cutter head 92, and the same procedure as in the above-described embodiment is performed. The small-diameter shield excavation section 100 is pulled out to the inside of the machine, and a carrier truck (not shown)
To return to the starting shaft 38.

In the starting shaft 38, toward the small-diameter tunnel 48 in which the small-diameter shield excavation portion 100 is to be formed,
The small-diameter shield excavator 91 is formed by attaching members such as the outermost peripheral bit 101, the hood 102, the rear girder portion 103, the tail portion 104, the erector 105, and the earth discharging device to the small-diameter shield excavator 100. .

After the small-diameter shield machine 91 is formed, the small-diameter tunnel 4 is manufactured in the same procedure as the above-mentioned embodiment.
Build 8.

As described above, since the large-diameter cutter head 93 is integrally attached to the small-diameter cutter head 92 and the small-diameter cutter head 92 is driven to rotate, the hydraulic motor as a drive device can be reused without waste. The work cost can be reduced.

The small-diameter cutter head 92 and the large-diameter cutter head 93 may be integrally formed when excavating the large-diameter tunnel 47, and may be integrally formed by welding.

[0097]

In summary, the present invention has the following excellent effects.

(1) A large-diameter tunnel and a small-diameter tunnel can be constructed inexpensively from one starting shaft without the need for a reaching shaft.

[Brief description of drawings]

FIG. 1 is a side cross-sectional view of a large-diameter shield machine showing a preferred embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a side sectional view of a small diameter shield machine.

FIG. 4 is a front view of FIG.

5 is an enlarged view of a main part of FIG.

FIG. 6 is a front view of FIG.

FIG. 7 is a side sectional view of a large-diameter shield machine during excavation.

8 is a view taken along the line VIII-VIII of FIG.

FIG. 9 is a side cross-sectional view of the large-diameter shield excavator in a state in which it has been dug up to a destination point.

FIG. 10 is a side sectional view of the large-diameter shield excavator in a state where the small-diameter shield excavator is pulled out into the machine.

FIG. 11 is a side sectional view of the large-diameter shield excavator in a state where the small-diameter shield excavator is being conveyed to the starting shaft.

FIG. 12 is a side cross-sectional view of the small-diameter shield excavation portion in a state where the small-diameter shield excavator is formed in the starting shaft.

FIG. 13 is a side sectional view of the small-diameter shield machine in the state where the small-diameter tunnel is being constructed.

14 is a view taken along line XIV-XIV in FIG.

FIG. 15 is a side sectional view of a large-diameter shield machine showing another embodiment.

16 is a front view of FIG.

FIG. 17 is a side sectional view of a small-diameter shield excavator formed using the small-diameter shield excavator of FIG. 15.

FIG. 18 is a side sectional view of a large diameter shield machine, showing another embodiment.

FIG. 19 is a front view of FIG. 18.

20 is a side cross-sectional view of a small-diameter shield excavator formed using the small-diameter shield excavator of FIG.

FIG. 21 is a side sectional view of a conventional tunnel construction method.

FIG. 22 is a side sectional view of a conventional tunnel construction method.

[Explanation of symbols]

1 large diameter shield machine 2 Small diameter shield excavation section 4 large diameter cutter head 7 Shield frame 10 Rail for pulling out girder part 21 Small diameter cutter head 27 Girder section 32 Second hydraulic motor 34 Second mud pipe (earth removal device) 35 2nd mud pipe (earth discharging device) 36 Central support member 38 Start shaft 39 rails 40 rails 41 rails 42 Dedicated truck (hydraulic unit truck) 43 Shared truck (hydraulic unit truck) 45 segment transport space 46 segment carrier 47 large diameter tunnel 48 small diameter tunnels 53 hood 57 small diameter shield machine 58 carrier

Front page continuation (72) Inventor Tomoya Iijima 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Inside Taisei Corporation (72) Inventor Toshiaki Uehara 2-2-1 Otemachi, Chiyoda-ku, Tokyo Ishikawajima Harima Heavy Industry Co., Ltd. (72) Inventor Katsumi Kadota 11-1 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima Heavy Industries Co., Ltd. Aichi Factory (72) Inventor, Yuzuru Yoshida 11-1 Kitahama Town, Chita City, Aichi Prefecture Harima Ishikawashima (56) Reference JP-A-3-267497 (JP, A) JP-A-6-240981 (JP, A) JP-A-8-312285 (JP, A) JP-A-9-287384 (JP, A) JP 9-13896 (JP, A) JP 9-170397 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/06 E21D 9 / 08 E21D 11/40

Claims (8)

(57) [Claims] 1. A small-diameter shield excavation part that can be separated and independently can be pulled out backward in the center of a large-diameter shield excavator.
Installed to support the small diameter shield excavation part and
Seal between the large-diameter shield machine and the large-diameter shield machine
From the rear side of the small diameter shield excavation part
After mounting the excavator to form a machine and constructing a large-diameter tunnel using the machine, the center support member of the machine is machined.
Remove the inside, until the calling proceeds pit position via the large diameter tunnel pull the small-diameter shield portion inboard
After returning the hood , the small-diameter shield digging part has a hood of approximately the same diameter.
Small-diameter shield machine dedicated members such as
Forming a rudder machine, and using the small-diameter shield machine
A tunnel construction method characterized by building a small-diameter tunnel. 2. A small-diameter shield excavation part that can be separated and separated can be pulled out rearward in the center of the large-diameter shield excavator.
Installed to support the small diameter shield excavation part and
Seal between the large-diameter shield machine and the large-diameter shield machine
From the rear side of the small diameter shield excavation part
After mounting the excavator to form a machine and constructing a large-diameter tunnel using the machine, the center support member of the machine is machined.
Remove the inside, until the calling proceeds pit position via the large diameter tunnel pull the small-diameter shield portion inboard
After returning the hood , the small-diameter shield digging part has a hood of approximately the same diameter.
Small-diameter shield machine dedicated members such as
A tunnel construction method characterized in that a tunnel excavator is formed, and a small-diameter tunnel is constructed from a starting shaft using the small-diameter shield excavator . 3. A small-diameter shield excavator is provided in a small-diameter cutter head provided at a central portion of a cutter of a large-diameter shield excavator and a shield frame of the large-diameter shield excavator so that the small-diameter cutter excavator can be extracted. It consists of a ring-shaped girder part that supports the head and the drive device, and after returning to the starting shaft position, a small-diameter shield for the small-diameter shield excavation part, such as a hood with a small diameter The tunnel construction method according to claim 1 or 2, wherein a small-diameter shield excavator is attached with a member dedicated to a cold machine, and a small-diameter tunnel excavator is used to construct a small-diameter tunnel. 4. A large-diameter shield machine is separated at the center of the machine.
To be able to extract the stand can be small-diameter shield tunneling portion to the rear
Installed to support the small diameter shield excavation part and
Seal between the large-diameter shield machine and the large-diameter shield machine
From the rear side of the small diameter shield excavation part
Install it to form a machine and use this machine to
After constructing the tunnel, the central support member of the excavator
Remove it inside and pull the small-diameter shield excavation part inside the machine.
Out the small-diameter shield excavation part through the large-diameter tunnel.
Via and returned to the starting shaft position using rails
After that, the small-diameter shield excavation part has a small
Small-diameter shield digging by attaching special members for diameter shield machine
Form a machine, and use the small-diameter shield machine to create a small-diameter machine.
A tunnel construction method characterized by building a tunnel. 5. The tunnel construction method according to claim 4, wherein the rail is a rail for transferring a trolley for transporting a segment, a trolley for a hydraulic unit, and the like when constructing a large-diameter tunnel. 6. A small-diameter shield excavator's small-diameter cutter is provided in the center of the cutter of the large-diameter shield excavator so that it can be separated and independent, and a ring-shaped girder part is provided on the shield frame of the large-diameter shield excavator so that it can be withdrawn. , The girder part rotatably supports a small-diameter cutter and its drive device is installed, and the small-diameter shield excavation part is pulled inside the machine on the shield frame of the large-diameter shield excavator.
A rail for pulling out the girder part for sending out is provided, and further,
On the rear side of the girder part, the shield frame and the girder part
A shield machine having a central portion supporting member for supporting the girder portion on the shield frame while sealing the gap between the shield excavator. 7. The shield machine according to claim 6, wherein the outer diameter of the small diameter cutter is smaller than the outer diameter of the girder portion. 8. A cutter center of a large-diameter shield machine
Separates the small-diameter cutter in the small-diameter shield excavation section
Shield frame for large-diameter shield machine
A ring-shaped girder part is provided on the
A small-diameter cutter is rotatably supported on the
Equipped with a drive device for the large-diameter shield machine
The small-diameter shield excavation part is pulled inside the machine
A rail for pulling out the girder part for sending out is provided, and further,
On the rear side of the girder part, the shield frame and the girder part
Girder part is attached to the shield frame while sealing between
The central support member for supporting lifting provided, the large diameter Sea
Field shield tunneling machine and a hydraulic unit carriage spun off to drive the hydraulic unit carriage and the small-diameter shield portion for driving the large-diameter shield machine to provided movably each carriage in separate rail, at both carriage A shield machine with a segment transfer space formed between them .