JP2006283546A

JP2006283546A - Shield machine

Info

Publication number: JP2006283546A
Application number: JP2005371363A
Authority: JP
Inventors: Yutaka Kashima; Hideyuki Takeuchi; 豊加島; 秀行武内
Original assignee: Daiho Constr Co Ltd; 大豊建設株式会社
Priority date: 2005-03-07
Filing date: 2005-12-26
Publication date: 2006-10-19

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield machine which excavates tunnels of small cross section to large cross section with a single cutter part. <P>SOLUTION: A shield inner cylinder part is attached to a shield outer cylinder part so that the shield inner cylinder part can be fixed/pulled out, and a cutter rotary shaft having a cutter boss at its front end is supported at the shield inner cylinder part. Then the cutter rotary shaft is connected to a cutter rotary drive device, and a telescopic cutter spoke is attached to the cutter boss of the shield-driving machine. Then a plurality of telescopic cutter spokes are arranged at predetermined intervals in a position which is eccentric from the rotation center of the cutter, and which is on a cutter circle path of larger diameter than the cutter boss. Then each of the telescopic cutter spokes is attached to the outside of the cuter boss and is directed in the tangential direction of the cutter circle path. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a shield machine suitable for excavating from a small section tunnel to a large section tunnel with a single cutter portion.

2. Description of the Related Art Conventionally, as a shield machine equipped with an extendable cutter pork, for example, there is a technique described in Japanese Patent No. 3361139.

In the prior art described in the above-mentioned patent publication, a cutter boss is provided at the front end portion of the cutter rotating shaft, and a fixed cutter pork and an extendable cutter pork are attached in the radial direction of the cutter boss.
Japanese Patent No. 3361139

As described above, in the conventional technology, fixed cutter spokes and extendable cutter spokes are attached in the radial direction of the cutter boss. There was a problem that large strokes could not be used.

As a result, when the above-mentioned conventional technology is incorporated into a shield machine that is configured so that the assembly of the shield inner cylinder part and cutter part can be fixed and pulled out on the shield outer cylinder part, a retractable cutout pork with a large stroke can be used. Since it cannot be adopted, there is a problem that it cannot be applied to a shield machine that excavates from a small section tunnel to a large section tunnel with a single cutter part.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a shield machine capable of excavating from a small section tunnel to a large section tunnel with a single cutter portion.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a cutter rotating shaft having a shield inner cylinder portion attached to a shield outer cylinder portion so that the shield inner cylinder portion can be fixed and pulled out, and a cutter boss at a front end portion of the shield inner cylinder portion. A shield machine in which the cutter rotation shaft is connected to a cutter rotation driving device, and a telescopic cutter pork for excavation of natural ground is attached to the cutter boss, wherein the telescopic cutter pork is eccentric from the rotation center of the cutter. A plurality of bases are arranged at predetermined positions at predetermined intervals, and each of the extendable cutter spokes is attached to the outer portion of the cutter boss in the tangential direction of the cutter's rotation trajectory.
According to a second aspect of the present invention, in the shield machine according to the first aspect, the extendable cutter spoke includes a cutter spoke outer cylinder, a freely movable retractable cutter spoke inner cylinder, and the cutter spoke outer cylinder. Further, it is characterized in that it is provided in an inner cylinder of the katspoke and is composed of an extendable jack for advancing and retracting the katspoke inner cylinder.
According to a third aspect of the present invention, in the shield machine according to the first aspect, the telescopic cutter spoke includes a cutter spoke outer cylinder and a retractable cutter spoke inner cylinder provided on the inner side thereof. The cylinder is characterized in that it is fixed to a cutter spoke outer cylinder at a predetermined position via a fixing pin.
According to a fourth aspect of the present invention, in the shield machine according to the third aspect, the cutter spoke inner cylinder has a first pin hole located on the bottom side from the center and a first pin hole located on the tip side from the center. 2 pin holes are provided, and a pin insertion hole is provided in the cutter spoke outer cylinder, and a fixing pin is inserted into the first or second pin hole aligned with the pin insertion hole so that the inside of the cutter spoke. It is characterized by fixing the tube.

In the first to fourth aspects of the present invention, each of the expandable cutter spokes 17 is attached to the outer portion of the cutter boss 16 at a position that is decentered from the rotation center of the cutter and in the tangential direction of the cutter rotation locus. Therefore, it is possible to adopt a large stroke one for each expansion / contraction cutter pork 17 without being restricted by the diameter of the cutter boss. Therefore, there is an effect that excavation is possible from a small section tunnel to a large section tunnel by a single cutter portion provided with the extendable cutter pork 17 having a large stroke.

Moreover, according to invention of Claims 1-4, a cutter part can be put together compactly by shrinking | reducing each expansion-contraction cutter pork 17. Therefore, both the extraction of the shield inner cylinder part 8 and the cutter part assembly from the shield outer cylinder part 2 and the insertion of the shield inner cylinder part 8 and the cutter part assembly into the shield outer cylinder part 2 can be easily performed. There is an effect that the drawing / insertion work can be efficiently performed when the assembly of the shield inner cylinder portion 8 and the cutter portion is reused.

Further, according to the third and fourth aspects of the invention, since the extendable cutter pork has a simple configuration, the production of the shield excavator can be facilitated and the cost can be reduced accordingly.

The present invention can be applied to either a hermetic shield or a propulsion device in a propulsion method.

Embodiments of the present invention will be described below with reference to the drawings.

[First embodiment]
1 to 5 show a first embodiment of the present invention. FIG. 1 is a longitudinal side view of a shield machine in a face excavation state, FIG. 2 is a partial longitudinal front view of line AA in FIG. 3 is a cross-sectional view taken along the line BB in FIG. 2, FIG. 4 is a partially broken side view when the assembly of the shield inner cylinder part and the cutter part is pulled out after tunnel excavation, and FIG. 5 is a cross-sectional view taken along the line CC in FIG. FIG.

The shield machine 1 of the first embodiment shown in FIGS. 1 to 5 includes a cylindrical shield outer cylindrical portion 2, a cylindrical shield inner cylindrical portion 8 having a smaller diameter than this, and a cutter rotating shaft. First and second bearings 14 and 32, a cutter rotating shaft 15, a telescopic cutter pork 17 for excavating natural ground, a cutter rotation driving device 29, a chamber 33 for taking in excavated soil, An earth pressure gauge 34 for measuring earth pressure, a swivel joint 35, a mud material pipe 36, a hydraulic pipe 38 for operation of extending and lowering a pork spoke, and an earth discharging device for discharging excavated earth and sand in the chamber 33 as it advances. 40, a shield jack 41 for excavation, an extraction / push-in jack (not shown) for assembly of the shield inner cylinder part and the cutter part, and the like.

As shown in FIGS. 1A and 4, the shield outer cylinder portion 2 is configured by combining an outer cylinder 3, a front end plate 4, a rear end plate 5, an inner cylinder 6, and a hood 7. ing. The inner cylinder 6 is provided with a plurality of cap nuts 11 at predetermined intervals in the circumferential direction.

As shown in FIGS. 1A and 4, the shield inner cylinder portion 8 includes a shield drive inner cylinder 9 and a partition wall 10 attached to the front end portion thereof. The shield inner cylinder portion 8 is formed to have a diameter that can be fitted inside the shield outer cylinder portion 2. A bolt through hole 12 is formed in the shield driving inner cylinder 9 in alignment with the cap nut 11.

When the shield machine 1 is in use, a set bolt 13 is passed through each bolt through-hole 12 and the set bolt 13 is screwed into the cap nut 11 and fixed. Thus, the shield outer cylinder part 2 is connected to the shield inner cylinder part 8 and The assembly of the cutter part is fixed.

As another fixing method, as shown in FIG. 1B, an inner cylinder flange 9 ′ is provided at the end of the shield driving inner cylinder 9 so as to contact the outer cylinder end 5, and the shield jack 41 does not interfere with it. The outer cylinder end 5 is provided with a bolt through hole 12, and the outer cylinder end 5 and the inner cylinder flange 9 'are fixed with a set bolt 13, whereby the outer cylinder and the inner cylinder can be fixed in the same manner as described above. It can also be used in combination with the fixing method.

As shown in FIGS. 1A and 4, the first bearing 14 for the cutter rotating shaft is provided in the partition wall 10 of the shield inner cylinder portion 8. The second bearing 32 is provided on a back portion of a gear box 30 described later in the cutter rotation driving device 29.

The cutter rotating shaft 15 is rotatably supported by the first and second bearings 14 and 32. A cutter boss 16 is integrally provided at the front end of the cutter rotating shaft 15. As shown in FIG. 2, the cutter boss 16 is formed, for example, in a substantially rectangular shape when viewed from the front in this embodiment.

As shown in FIGS. 2 and 5, two expansion / contraction cutter spokes 17 are provided in this embodiment. As shown in FIGS. 2, 3, and 5, each extendable cutter spoke 17 includes a bottomed cylindrical cutter spoke outer cylinder 18, a cutter spoke inner cylinder 19 provided inside thereof, and a cutter spoke inner cylinder 19. The telescopic operation jack 21 is provided. The cutter spoke inner cylinder 19 is inserted into the cutter spoke outer cylinder 18 so as to be extendable and contractible. The expansion / contraction operation jack 21 has a jack cylinder 22 and a piston rod 23 fitted therein. The jack cylinder 22 is fixed in the cutter spoke outer cylinder 18 via the jack support portion 20. The rod end of the piston rod 23 is hinged to the cutter spoke inner cylinder 19 via a pin 24.

As shown in FIGS. 2 and 5, the two telescopic cutter spokes 17 are provided at positions eccentric from the cutter rotation center, are larger than the radius of the cutter boss 16, and are centered on the rotation center O <b> 1 of the cutter rotation shaft 15. Are arranged opposite to each other in the tangential direction of the cutter circle locus, and are attached to the flat surfaces of the respective outer portions of the cutter boss 16 via the cutter spoke outer cylinder 18.

As the piston rod 23 is expanded or contracted by the expansion / contraction operation jack 21, each of the expansion / contraction cutter spokes 17 is operated to extend or contract the cutter spoke inner cylinder 19 with respect to the cutter spoke outer cylinder 18. Yes.

A fixed cutter spoke 25 is attached to the outer side of the cutter spoke outer cylinder 18 of each of the extendable cutter spokes 17. The fixed cutter spoke 25 is formed in a length that can pass through the inside of the inner cylinder 6 of the shield outer cylinder portion 2.

A fishtail-shaped center cutter 26 is provided on the front end face of the cutter boss 16. In addition, a plurality of cutter bits 27 are provided on the front surface of the cutter spoke outer cylinder 18 of each extendable cutter spoke 17. Further, a cutter bit 27 is also provided on the front surface of the cut spoke inner cylinder 19 of each expandable cut spoke 17 at a portion exposed when the cut spoke spoke inner cylinder 19 is reduced. Further, a stirring blade 28 is provided on the back surface of the back surface of the cut portion of the inner portion of the cutter spoke inner cylinder 19 which is exposed when the inner shell 19 of the cut spoke pork is reduced. A cutter bit 27 is also provided on the front surface of each fixed cutter spoke 25.

As shown in FIGS. 1 and 4, the cutter rotation drive device 29 includes a gear box 30 fixed to the back portion of the partition wall 10 of the shield inner cylinder portion 8, and a cutter drive motor attached to the back portion of the gear box 30. 31 and a reduction gear (not shown) provided between the cutter driving motor 31 and the cutter rotating shaft 15 in the gear box 30.

The cutter rotating shaft 15, the cutter boss 16, the two extendable cutter spokes 17 attached to the cutter boss 16, and the cutter rotation driving device 29 constitute a cutter unit.

As shown in FIG. 1, the chamber 33 for taking in excavated earth and sand is surrounded by a hood 7 of the shield outer cylinder portion 2, a partition wall 10 of the front end plate 4 and the shield inner cylinder portion 8, an extendable cutter pork 17 and a fixed cutter pork 25. It is divided into spaces.

The earth pressure gauge 34 is provided on the front side of the partition wall 10 so as to face the chamber 33.

A front end of the support cylinder 39 for the earth removing device is fixed to the lower side of the partition wall 10.

The swivel joint 35 is connected to the rear end portion of the cutter rotating shaft 15. As shown in FIGS. 1 and 4, the swivel joint 35 is connected to a mud clay material pipe 36 and a hydraulic pipe 38 for cutting and extending the spokes.

The mud clay pipe 36 is guided to the front end of the cutter boss 16 through the inside of the cutter rotating shaft 15. As shown in FIGS. 1 and 4, a mud clay material outlet 37 is provided at the front end of the cutter boss 16, and the mud clay material supplied through the mud clay pipe 36 is used as the mud clay material outlet 37. It is designed to erupt toward the excavated soil.

The hydraulic piping 38 is led to the attachment position of the expansion / contraction cutter pork 17 in the cutter boss 16 through the inside of the cutter rotating shaft 15, and supplies the hydraulic pressure to the approach side and the return side of the expansion / contraction operation jack 21 of each expansion / contraction cutter spoke 17. It has come to be able to do.

As shown in FIG. 1, the excavated earth and sand discharging device 40 is inserted and supported in a support cylinder 39 fixed to the lower part of the partition wall 10, and is attached to the chamber 33 so that the earth and sand intake port faces.

As shown in FIG. 1, a plurality of shield jacks 41 are installed at predetermined intervals in the circumferential direction at the rear part in the shield outer cylinder part 2. Each shield jack 41 takes a reaction force on a segment (not shown) assembled behind the shield outer cylinder portion 2 and pushes the rear end plate 5 of the shield outer cylinder portion 2 to propel the shield shield machine 1 as a whole. It is supposed to let you.

The pull-out / push-in jack (not shown) is arranged in a pit so that the assembly of the shield inner cylinder portion 8 and the reduced cutter portion is pulled out from the shield outer cylinder portion 2 or pushed into the shield outer cylinder portion 2. It has become.

The shield machine 1 configured as described above is used and operates as follows.

First, in an initial state before the shield inner cylinder part 8 is assembled to the shield outer cylinder part 2, the shield inner cylinder part 8 is attached with a cutter part, a swivel joint 35, and a support cylinder 39 for a soil removal device. Yes. The expansion / contraction cutter pork 17 of the cutter part is fixed in a contracted state.

In assembling the shield machine 1 from this state into a usable state, the shield driving inner cylinder 9 of the shield inner cylinder part 8 is aligned with the inner cylinder 6 of the shield outer cylinder part 2 installed in advance, The assembly of the shield inner cylinder part 8 and the cutter part is pushed into the inner cylinder 6 of the shield outer cylinder part 2 by the provided extraction / push-in jack. At this time, the bolt nuts 11 formed in the shield driving inner cylinder 9 of the shield inner cylinder portion 8 are aligned with the cap nuts 11 provided in the inner cylinder 6 of the shield outer cylinder portion 2, while The shield inner cylinder part 8 is pushed into the front end plate 4 of the cylinder part 2 until the partition wall 10 of the shield inner cylinder part 8 is substantially flush with the surface.

Next, set bolts 13 are passed through the respective bolt through holes 12, the set bolts 13 are screwed into the cap nuts 11, and the shield inner cylinder part 8 is assembled and fixed to the shield outer cylinder part 2. In addition, a mud material pipe 36 and a hydraulic pipe 38 for cutting and extending the spokes are connected to the swivel joint 35. Further, the earth removing device 44 is inserted into the support cylinder 39 for the earth removing device and fixed. Further, a plurality of shield jacks 41 are installed behind the rear end plate 5 of the shield outer cylinder portion 2 at a predetermined interval from each other.

Then, the hydraulic pressure is sent from the hydraulic piping 38 for extending and retracting the cutter pork to the approach side of the extension and operation jack 21 of each extending and retracting pork 17 so that each extending and receiving pork 17 has its face cut to the diameter D1 of the shield outer cylinder portion 2. Extend to a length that can be drilled.

When starting the shield machine 1 from this state, the cutter driving motor 31 of the cutter rotation driving device 29 is driven, the cutter rotating shaft 15 is rotated via a reduction gear (not shown) in the gear box 30, The stretchable cutter pork 17 and the fixed cutter pork 35 are rotated via the cutter boss 16, and a ground cutter is provided by a center cutter 26 provided on the cutter boss 16 and a number of cutter bits 27 provided on the extendable cutter pork 17 and the fixed cutter spoke 25. Drilling. In this embodiment, a situation is shown in which the ground improvement portion 42 (see FIG. 4) has been excavated as a natural ground of the reaching portion where the excavation ends.

During excavation of the natural ground, the mud material is supplied from the mud material pipe 36, and the mud material is ejected from the mud material outlet 37 provided at the front end of the cutter boss 16 and mixed with the excavated soil. .

The excavated soil mixed with the mud material is taken into the chamber 33, and stirred and kneaded by the stirring blades 28 provided on the cutter spoke inner cylinder 19 of the extendable cutter pork 17 and the stirring blades 28 provided on the fixed cutter pork 25. .

While the earth pressure in the chamber 33 is monitored by the earth pressure gauge 34, the excavated earth and sand in the chamber 33 is taken out by the earth removing device 40, carried out to the rear of the mine, and discharged.

In this way, while excavating the face in a predetermined range, the plurality of shield jacks 41 are extended, and a reaction force is applied to a segment (not shown) assembled at the rear to propel the entire shield machine 1. Next, the shield jack 41 is reduced and the segments are assembled again.

The above operation is repeated, and in this embodiment, a tunnel penetrating the shaft wall 43 (see FIG. 4) is dug by the shield machine 1.

Work from the inside of the reaching shaft having the shaft wall 43 is often restricted, and after excavating the tunnel, the assembly of the shield inner cylinder portion 8 and the cutter portion is recovered through the following operation.

First, the hydraulic pressure is sent from the hydraulic pipe 38 for extending / retracting operation of the cutter pork to the return side of the extension / retraction operation jack 21 of each extension / removal cutter pork 17. Reduce to a length that can pass through the interior and fix to that length. The mud material pipe 36 and the hydraulic pipe 38 are removed from the swivel joint 35. Further, the shield jack 41 is removed. Further, the earth removing device 40 is pulled out from the support cylinder 39 and removed. Each set bolt 13 is removed from the cap nut 11.

FIG. 5 is a partially broken cross-sectional view showing a state in which each expansion / contraction cutter pork 17 is reduced to a length that can pass through the inner cylinder 6 of the shield outer cylinder portion 2.

From this state, the assembly of the shield inner cylinder part 8 and the cutter part is pulled out from the inner cylinder 6 of the shield outer cylinder part 2 in the direction indicated by the arrow in FIG. .

Then, the recovered assembly of the shield inner cylinder portion 8 and the cutter portion is reused.

According to the first embodiment described above, each extendable cutter spoke 17 is provided at a position that is eccentric from the rotation center of the cutter and is larger than the radius of the cutter boss 16 and is disposed in the tangential direction of any cutter rotation locus. And since it is attached to the outer part of the cutter boss 16, it is not restricted by the diameter of the cutter boss 16, so that each expansion / contraction cutter pork 17 can be of a large stroke. As a result, each stretchable cutter spoke 17 can be extended to a long stroke from a state where it is reduced to a length that can pass through the inner cylinder 6 of the shield outer cylinder portion 2. Thereby, the outer diameter D1 of the shield outer cylinder part 2 can be taken larger than the outer diameter D2 of the shield inner cylinder part 8. Therefore, it is possible to excavate from the small section tunnel to the large section tunnel by the assembly of the single shield inner cylinder section 8 and the cutter section, and to expand the application range of the shield inner cylinder section 8 and the cutter section assembly. Can do.

In the illustrated embodiment, each telescopic cutter pork 17 can be extended to a length capable of excavating a tunnel having a maximum diameter D1m, as shown in FIG.

Further, according to the first embodiment, as shown in FIG. 5, the cutter parts can be compactly gathered in a state in which each of the telescopic cutter spokes 17 is reduced. Therefore, the shield inner cylinder part 8 and the cutter part assembly can be easily pulled out from the shield outer cylinder part 2, and the shield inner cylinder part 8 and the cutter part assembly can be easily inserted into the shield outer cylinder part 2. Can be performed efficiently.

In the first embodiment, three or more extendable cutter spokes 17 may be attached to the cutter boss 16.

[Second Embodiment]
Next, FIGS. 6 and 7 show a second embodiment of the present invention. FIG. 6 is a longitudinal side view of the shield machine in a state where the face is excavated, and FIG. 7 is a partially broken front view.

This embodiment is characterized in that three cutter spoke attachment portions are formed on the outer peripheral portion of the cutter boss 50, and the cutter spokes are respectively attached to these cutter bosses 50, thereby improving excavation efficiency.

On the outer periphery of the cutter boss 50, an extendable cutter spoke attachment base 51 is provided at a predetermined interval in the circumferential direction. In this embodiment, as shown in FIG. 7, the three pieces of the cutter pork mounting base 51 are provided at an interval of approximately 120 °.

In this embodiment, three extendable cut-out spokes 52 are provided. As shown in FIG. 7, each extendable cutter spoke 52 includes a cutter spoke inner cylinder 53, a cutter spoke outer cylinder 54, and an extension operation jack 55. The cutter spoke outer cylinder 54 is fitted to the cutter spoke inner cylinder 53 so as to be extendable and contractible. The expansion / contraction operation jack 55 includes a jack cylinder 56 and a piston rod 57 fitted into the jack cylinder 56. The jack cylinder 56 is hinge-coupled to the cutter spoke inner cylinder 53 by a jack support pin 58. The rod end of the piston rod 57 is hinged to the cutter spoke outer cylinder 54 by a rod support pin 59.

As shown in FIG. 7, the three extendable cutter spokes 52 are directed toward the tangential direction of the cutter circular locus centering on the rotation center O2 of the cutter rotation shaft 49, which is larger than the radius of the cutter boss 50, and approximately 120 ° to each other. And is attached to the outer portion of the cutter boss 50 via the cutter pork mounting base 51.

Accordingly, as the piston rod 57 is expanded or contracted by the expansion / contraction operation jack 55, each of the expansion / contraction cutter spokes 52 is operated to extend or contract the cutter spoke outer cylinder 54 with respect to the cutter spoke inner cylinder 53. ing.

A center cutter 60 is provided on the front end face of the cutter boss 50. Further, a cutter bit 61 is provided on the front surface of the cutter spoke inner cylinder 53 of each of the extendable cutter spokes 52 at a portion exposed when the cutter spoke outer cylinder 54 is contracted. Further, a plurality of cutter bits 61 are provided on the front surface of the cutter spoke outer cylinder 54 of the extendable cutter spoke 52. A stirring blade 62 is provided on the back surface of the cutter spoke outer cylinder 54.

Other configurations, operations, and the like are the same as those of the above-described embodiment, and the same members are denoted by the same reference numerals in order to avoid duplication of explanation.

The shield machine 44 of the second embodiment is used and operates as follows.

First, in the initial state, it is assumed that each stretchable cut spoke 52 is reduced so as to fit within the diameter D4.

In this state, the hydraulic pressure is sent from the hydraulic piping 38 for extending and retracting the cutter pork to the approach side of the extension jack 55 of each extending and retracting spoke 52, and each extending and retracting spoke 52 is connected to the shield outer cylinder portion 2. It is extended to a length that can be excavated to the same diameter D3 as the outer diameter.

When starting the shield machine 44 from this state, the cutter driving motor 31 of the cutter rotation driving device 29 is driven, the cutter rotating shaft 15 is rotated via the reduction gear in the gear box 30, and the cutter boss 50 is connected. The stretchable cutter pork 52 is rotated, and a natural ground is excavated by a center cutter 60 provided on the cutter boss 50 and a number of cutter bits 61 provided on the extendable cutter spoke 52.

During excavation of the natural ground, the mud material is supplied from the mud material pipe 36, and the mud material is ejected from the mud material spout 71 provided at the front end of the cutter boss 50 to the excavated soil. Mix.

The excavated soil mixed with the mud material is taken into the chamber 33, and stirred and kneaded by the stirring blade 62 provided on the cutter spoke outer cylinder 54 of the extendable cutter spoke 52.

While the earth pressure in the chamber 67 is monitored by the earth pressure gauge 34, the excavated earth and sand in the chamber 33 is taken out by the earth removing device 40, carried out to the rear in the mine, and discharged.

After excavating the face within a predetermined range by the above-mentioned work, a plurality of shield jacks 41 are extended at the same time, and a reaction force is applied to a segment (not shown) assembled at the rear of the mine to propel the entire shield machine 44 Let Next, the shield jack 41 is reduced and the segments are assembled again.

The above work is repeated, excavating the natural ground and digging the tunnel.
In the second embodiment, similarly to the first embodiment, after the tunnel excavation, each of the telescopic cutter spokes is reduced, and the assembly of the shield inner cylinder portion 8 and the cutter portion is connected to the inner cylinder of the shield outer cylinder portion 2. It is economical because it can be extracted from 6, recovered, and diverted to others.

According to the second embodiment described above, each of the three extendable cutter spokes 52 is arranged in the tangential direction of the cutter circular locus larger than the radius of the cutter boss 50, and the cutter boss 50 is connected via the cutter pork mounting base 51. Since it is attached to the outer side, excavation efficiency is improved and there is no restriction due to the diameter of the cutter boss. Therefore, since the single cutter part can be used for excavation of the small section tunnel and the large section tunnel, the applicable range of the cutter part can be expanded.

In the second embodiment, the shape of the cutter boss 50 may be changed, and two telescopic cutter spokes 52 may be attached, or four or more may be attached.

Further, the extendable cutter spoke 52 may be directly attached to the outer side of the cutter boss 50.

[Third embodiment]
8 to 10 show a third embodiment of the present invention. 8 is a longitudinal side view of the shield machine in the face excavation state, FIG. 9 is a cross-sectional view taken along the line D-D in FIG. 8, and FIG. 10 is a length that allows each telescopic cutter pork to pass through the inner cylinder of the shield outer cylinder part. The partially broken front view of the state reduced to this is shown.

This embodiment is characterized in that the extendable cutter pork 17 'has a simple configuration.

That is, the extendable and retractable cut-out spoke 17 'is provided on the inner side of the cut-out spoke outer cylinder 18' composed of a hollow cylindrical body with a bottom, and slides with the cut-out spoke outer cylinder 18 'as a guide member to advance and retreat. A free cutter spoke inner cylinder 19 'is provided.

In the cutter spoke outer cylinder 18 ', no jack cylinder is provided as in the previous embodiment.

Since the outer shape of the katspoke inner cylinder 19 'has a shape substantially corresponding to the inner shape of the katspoke outer cylinder 18' and does not house a jack cylinder inside, it can be solidified as a solid steel bar. The cross-sectional shape can be reduced.

Further, in this shield excavator, fixing the cutter spoke inner cylinder 19 'to the cutter spoke outer cylinder 18' is a simple pin fixing means.

That is, the cutter spoke inner cylinder 19 'has a first pin hole a used for face excavation penetrating in a direction orthogonal to the length direction, and a first pin hole a used for collecting the initial state and the assembly of the cutter unit. Two pin holes b are formed. The first pin hole a is formed slightly on the bottom side from the center part of the cutter spoke inner cylinder 19 ', and the second pin hole b is formed slightly on the tip part side from the center part. These first and second pin holes a and b are for inserting a rod-shaped fixing pin d.

In addition, fixed pin insertion holes c for fixing the fixed pins d inserted therethrough are opposed to each other on the slightly inner side of the distal end portion of the cutter spoke outer cylinder 18 '.

In this embodiment, two extendable cutter spokes 17 'are provided as in the first embodiment.

The cutter spoke outer cylinders 18 'are attached to the flat surfaces of the cutter boss 16' having substantially the same configuration as that of the first embodiment in opposite directions.

In addition, in the figure, 1 'is a shield machine, 2' is a shield outer cylinder part, 7 'is a hood, 8' is a shield inner cylinder part, 9 'is an inner cylinder flange, 10' is a partition wall, and 15 'is a cutter. The rotary shaft, 25 'is a fixed cutter pork, 26' is a center cutter, 27 'is a cutter bit, and 40' is a soil removal device. In this embodiment, the telescopic cutter pork 17 'has a simple configuration as described above. Except for this, the other basic configurations and operations are the same as in the first embodiment.

Next, the operation of the telescopic cutter spoke 17 'of this embodiment will be described.

FIG. 8 shows a state in which the cutter spoke inner cylinder 19 'is extended. This shows a state corresponding to FIG. 2 of the first embodiment.

When the cutter spoke inner cylinder 19 ′ is extended, the cutter spoke inner cylinder 19 ′ is pulled out from the cutter spoke outer cylinder 18 ′ and extended, and the first pin hole a and the pin insertion hole c are aligned, for example, on the cutter boss 16 ′ side. The fixing pin d is inserted through the nut, and a nut e may be screwed to the tip protruding from the opposite side. In this state, the face is excavated.

FIG. 10 shows an initial state or a case where the retractable cutter pork 17 ′ is contracted when the shield inner tube portion 8 ′ is pulled out from the shield outer tube portion 2 ′ after excavation is completed.

To achieve this state, the fixing pin d is removed from the first pin hole a, the second pin hole b and the pin insertion hole c are aligned, the fixing pin d is inserted, and the nut e is used for fixing. good. These operations are performed by workers. In this case, the bottom of the cutter spoke inner cylinder 19 'is positioned near the bottom of the cutter spoke outer cylinder 18', and the tip is positioned inside the shield inner cylinder 8 '. Therefore, after the excavation is completed, the assembly of the shield inner cylinder part 8 ′ and the cutter part can be pulled out from the shield outer cylinder part 2 ′ to the inside of the shaft.

In this embodiment, the extendable cutter spoke 17 'does not require the jack used in the first embodiment, and the cutter spoke inner cylinder 19' is a simple pin fixing means. Therefore, the configuration is simplified and the cost can be reduced. .

The structure of the extendable cutter pork 17 'can also be applied to the second embodiment shown in FIGS.

(A) shows the 1st example of the present invention and is a vertical side view of a shield machine in the state of excavation of a face. (B) shows the other example of the fixing means of two cylinders. It is the AA line partial vertical front view of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a partially broken side view when pulling out the assembly of a shield inner cylinder part and a cutter part after tunnel excavation. FIG. 5 is a partial longitudinal sectional front view taken along line CC of FIG. The 2nd Example of this invention is shown and it is a vertical side view of the shield machine in the excavation state of a face. It is a partially broken front view of FIG. It is 3rd Example of this invention, Comprising: The vertical side view of the shield machine in the face excavation state is shown. The DD sectional view taken on the line of FIG. The partially broken front view of the state which reduced each expansion-contraction cut-out spoke to the length which can pass the inside of the inner cylinder of a shield outer cylinder part is shown.

Explanation of symbols

1, 1 'shield machine 2, 2' shield outer cylinder part 7, 7 'hood 8, 8' shield inner cylinder part 9, 9 'inner cylinder flange 10, 10' partition 11 cap nut 13 set bolt 15, 15 ' Cutter Rotating Shaft 16 Cutter Boss 17, 17 'Telescopic Cut Spoke 18, 18' Cut Spoke Outer Cylinder 19, 19 'Cut Spoke Inner Cylinder 21 Telescopic Operation Jack 25, 25' Fixed Cutter Pork 26, 26 'Center Cutter 27, 27' Cutter Bit O1 Rotation Center of Cutter Rotating Shaft r1 Radius of Circular Trajectory C1 Circular Trajectory 29 Cutter Rotation Drive Device 33 Chamber 35 Swivel Joint 36 Mud Soil Piping 38 Hydraulic Piping for Katspoke Stretching Operation 39 Support Tube for Soil Removal Device 40, 40 'Earth removal equipment 41 Shield jack 44 Shield machine 45 Shield tube 46 Bulkhead 47 49 Cutter rotating shaft 50 Cutter boss 51 Cutter pork mounting base 52 Telescopic cutter pork 55 Telescopic operation jack O2 Center of rotation of cutter rotating shaft r2 Circular locus radius C2 Circular locus 63 Cutter rotation drive device 67 Chamber 69 Swivel joint 70 Mud material Piping 72 Hydraulic Piping for Katspoke Extension / Extension Operation 73 Earth Removal Device 74 Shield Jack a First Pin Hole b Second Pin Hole c Fixed Pin Insertion Hole d Fixed Pin

Claims

The shield inner cylinder part is attached to the shield outer cylinder part so that the shield inner cylinder part can be fixed and pulled out, and the cutter inner shaft part supports a cutter rotating shaft having a cutter boss at the front end, and this cutter rotating shaft is connected to the cutter rotation driving device, This is a shield machine with a cutter boss attached to a telescoping cutter pork for excavation of natural ground.
A plurality of the extendable cutter spokes are arranged at a predetermined distance from the center of rotation of the cutter with a predetermined interval, and each extendable cutter spoke is attached to the outer side of the cutter boss in the tangential direction of the cutter rotation trajectory. A shield machine characterized by
2. The shield machine according to claim 1, wherein the telescopic cutter spoke is provided in a cutter spoke outer cylinder, a retractable cutter spoke inner cylinder provided inside thereof, the cutter spoke outer cylinder and the cutter spoke inner cylinder. The shield machine is characterized by comprising a telescopic jack that moves the inner cylinder of the cutter spoke.
2. The shield machine according to claim 1, wherein the extendable cutter spoke includes a cutter spoke outer cylinder and a retractable cutter spoke inner cylinder provided inside thereof, and the cutter spoke inner cylinder is fixed to the cutter spoke outer cylinder. A shield machine that is fixed in place through a pin.
4. The shield machine according to claim 3, wherein the cutter spoke inner cylinder is provided with a first pin hole located on the bottom side from the center and a second pin hole located on the tip side from the center. The cutter spoke outer cylinder is provided with a pin insertion hole, and a fixing pin is inserted into the first or second pin hole aligned with the pin insertion hole to fix the cutter spoke inner cylinder. Shield engraving machine.