JP4397132B2 - Shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield machine, and more particularly to a retracting shield machine used in a tunnel underground joining method for joining tunnels excavated by two shield machines in the middle.
[0002]
[Prior art]
Conventionally, the tunnel head of one shield machine is used as an underground joint method for tunnels in which tunnels are excavated using two shield machines that face each other, and the tunnels are completed by joining the tunnels in the middle. There is a construction method in which a section surrounded by a skin plate is formed in the front, the front end of the other shield machine is fitted to the inner peripheral surface of the skin plate in this section, and the fitting part is stopped with a solidifying agent or a seal. Are known.
[0003]
In this case, as a method of forming a section surrounded by the skin plate in front of the cutter head, a method of pushing the skin plate forward along the axis of the shield machine (for example, Japanese Patent Publication No. 5-39238) ) And a method of pulling the cutter head backward (for example, Japanese Patent Publication No. 5-24319) has been proposed.
[0004]
However, in the former method of pushing the skin plate forward, it is difficult to ensure the strength of the skin plate and securely cut the outer periphery of the other shield when penetrating the skin plate into the front ground. There is a problem that the skin plate cannot be slid due to the biting of earth and sand, and in some cases, the skin plate is deformed and the sliding part is galling. On the other hand, with the latter method of pulling the cutter head backward, there is a risk that the ground above the cutter head collapses when the support structure supporting the cutter head is retreated, or when the retreat, the earth and sand bite into the sliding part. There is a problem that causes problems such as
[0005]
Therefore, in order to avoid such problems, the present applicants, as a prior application (Japanese Patent Application No. 8-92781; Japanese Patent No. 2915843), cover the outer periphery of the cutter head with the body of the shield machine. An underground bonding method has been proposed in which a drive ring garter having a cutter head is slid rearward after being advanced to a position. According to this prior application invention, it is possible to reliably prevent ground collapse that occurs when the drive unit ring garter slides backward, and to reliably slide the drive unit ring garter without causing sand or the like. It is possible to obtain operational effects such as.
[0006]
[Problems to be solved by the invention]
However, in the prior application invention, for example, in the case where the retracting side shield machine is an excavator having a bendable body part, the operation of advancing the front body with respect to the rear body is performed by a folded jack (articulated jack). This is a complicated procedure because the sliding operation to the rear of the drive unit ring gutter is performed by a shield jack, and it is necessary to switch between two types of jacks when replacing the ground joint. There is a problem of becoming.
[0007]
Further, in the prior invention, since the skin plate itself is slid to advance the body of the shield machine to the position covering the outer periphery of the cutter head, the drive unit after the body is advanced There is a problem that the length of the ring garter becomes large and the captain becomes longer as a whole.
[0008]
The present invention has been made in view of such problems, and in the retracting side shield excavator used in the underground bonding method, the replacement procedure at the time of underground bonding can be further simplified, and the captain is also shortened as a whole. It aims at providing the shield machine which can be done.
[0009]
[Means for solving the problems and actions / effects]
In order to achieve the above object, a shield machine according to the first invention is:
A skin plate, a cutter head drive support that is slidably inserted back and forth along the inner peripheral surface of the skin plate, and a slide back and forth along the inner peripheral surface of the cutter head drive support A cutter head driving unit that is fitted in, a cutter head that has an overcutter on the outer periphery and is rotatably supported in front of the cutter head driving unit, and a front end portion supported by the cutter head driving unit support. In a shield machine equipped with a shield jack,
A cutter head cover ring slidably inserted back and forth between the front end of the skin plate and the cutter head drive unit support, and holds the cutter head cover ring and the cutter head drive unit support so as not to move relative to each other. A first holding mechanism that can be held; a second holding mechanism that can hold the skin plate and the cutter head driving unit support member so as not to move relative to each other; and a connection that connects the cutter head driving unit and the skin plate. A first shield jack fixing means capable of fixing the member, the shield jack main body and the skin plate; and a second shield jack fixing capable of fixing the rod tip portion of the shield jack, the skin plate and the segment. And a driving unit fixing unit capable of fixing the cutter head driving unit and the cutter head driving unit support to each other. Means
It is characterized by providing.
[0010]
The shield excavator according to the present invention is used as a retracting side shield excavating machine in the underground bonding method, and when the retracting side shield excavating machine and the insertion side shield excavating machine are joined in the ground, first, the overcutter is shrunk and the shield jack is used. The rod tip portion, skin plate, and segment are fixed to each other by the second shield jack fixing means, the fixed state of the shield jack body and the skin plate by the first shield jack fixing means is released, and the drive portion The fixed state of the cutter head driving unit and the cutter head driving unit support by the fixing means is released. Next, the connection state between the cutter head cover ring and the cutter head drive unit support by the first holding mechanism is released, and the connection state between the skin plate and the cutter head drive unit support by the second holding mechanism is released. Then, the cutter head cover ring and the cutter head driving unit support are brought into a movable state. Next, by extending the shield jack, the cutter head driving unit support and the cutter head cover ring are advanced to a position covering the outer periphery of the cutter head with respect to the cutter head driving unit, and then the cutter head driving unit, the cutter head driving unit support, After fixing, the connecting member connecting the cutter head driving unit and the skin plate is removed. After that, the cutter head drive part is slid rearward by contraction of the shield jack to secure the receiving space of the insertion side shield machine, and the skin plate of the insertion side shield machine is placed inside the skin plate of the draw side shield machine. And the fitting part is stopped, and the tunnel underground connection is completed.
[0011]
According to the shield machine of the present invention, the slide operation of the cutter head driving unit support body can be performed only by the extension / contraction operation of the shield jack, so that the shield jack and the other jack are switched and switched as in the past. Compared to those, the replacement procedure at the time of underground bonding can be simplified. In addition, since the cutter head cover ring is used to cover the outer periphery of the cutter head, it is possible to reduce the retraction margin of the cutter head driving unit support as compared with the case where the skin plate itself is slid. Can be shortened.
[0012]
Next, the shield machine according to the second invention is:
A rear torso skin plate, a front torso skin plate that can be bent with respect to the rear torso skin plate, and a cutter head driving unit support that is slidably inserted back and forth along the inner peripheral surface of the front torso skin plate; The cutter head drive unit is slidably fitted back and forth along the inner peripheral surface of the cutter head drive unit support body, and the cutter head drive unit has an overcutter on the outer periphery and is rotatably supported in front of the cutter head drive unit. In a shield machine provided with a cutter head, a shield jack whose front end is supported by the cutter head drive unit support, and a bent jack that connects the cutter head drive unit and the rear trunk skin plate,
A cutter head cover ring slidably inserted back and forth between the front end portion of the front body skin plate and the cutter head drive unit support body, and the cutter head cover ring and the cutter head drive unit support unit cannot be moved relative to each other. A first holding mechanism that can be held on the front body, a second holding mechanism that is capable of holding the front body skin plate and the cutter head driving unit support so as not to move relative to each other, the shield jack body, and the rear body skin plate. A first shield jack fixing means capable of fixing the front end skin plate, a second shield jack fixing means capable of fixing the rod tip portion of the shield jack, the rear trunk skin plate and the segment, and the front trunk skin plate; Front and rear torso connection means for connecting the rear torso skin plate so as not to bend, the cutter head drive unit, and the cutter head drive Fixable driver fixing means mutual support
It is characterized by providing.
[0013]
The shield machine according to the present invention is applied to a bent type shield machine. When this shield machine is used as a retracting side shield machine in the underground welding method, when joining the retracting side shield machine and the insertion side shield machine, the overcutter is first shortened and the rod end of the shield jack And fixing the part, skin plate and segment to each other by the second shield jack fixing means, releasing the fixed state between the shield jack main body and the skin plate by the first shield jack fixing means, and by the drive part fixing means The fixed state of the cutter head driving unit and the cutter head driving unit support is released. Next, the connection state between the cutter head cover ring and the cutter head drive unit support by the first holding mechanism is released, and the connection state between the skin plate and the cutter head drive unit support by the second holding mechanism is released. The cutter head cover ring and the cutter head driving unit support are made movable, and the front trunk skin plate and the rear trunk skin plate are connected so as not to be bent by the front trunk / rear trunk connecting means. Next, by extending the shield jack, the cutter head driving unit support and the cutter head cover ring are advanced to a position covering the outer periphery of the cutter head with respect to the cutter head driving unit, and then the cutter head driving unit, the cutter head driving unit support, After fixing, the bent jack that connects the cutter head drive unit and the front trunk skin plate is removed. After that, the cutter head drive part is slid rearward by contraction of the shield jack to secure a receiving space for the insertion side shield machine, and the insertion side shield machine is placed inside the front body skin plate of the drawing side shield machine. The skin plate is fitted, the fitting part is stopped, and the tunnel underground joint is completed.
[0014]
According to the present invention, as in the first aspect of the invention, since the slide operation of the cutter head drive unit support body can be performed only by extending / contracting the shield jack without using the folding jack, the replacement at the time of underground joining is performed. The procedure can be simplified. In addition, since the cutter head cover ring is used to cover the outer peripheral portion of the cutter head, it is possible to reduce the pull-in allowance of the cutter head driving unit support, and the overall length can be shortened. Furthermore, since the middle-folded jack is not used for replacement, the middle-folded portion (bent portion) does not move, and even if this middle-folded portion is a perfect spherical type corresponding to a sharp curve, the cutter head drive unit support The sliding operation can be performed reliably.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific embodiments of the shield machine according to the present invention will be described with reference to the drawings.
[0016]
FIG. 1 shows a longitudinal sectional view of a shield machine (retraction-side shield machine) according to the first embodiment of the present invention.
[0017]
In the lead-side shield machine 1 of the present embodiment, the trunk is divided into a front trunk skin plate 2 and a rear trunk skin plate 3, and the front trunk skin plate 2 is fitted to the front end of the rear trunk skin plate 3. It is supported via the part 4 so as to be bent. A cutter head drive unit support 5 is slidably fitted back and forth on the inner peripheral surface of the front body skin plate 2, and the cutter head drive unit 6 is inserted on the inner peripheral surface of the cutter head drive unit support 5. Is inserted so as to be slidable back and forth, and a cutter head 7 is rotatably supported in front of the cutter head drive unit 6. Here, at the time of normal excavation, the cutter head driving unit support 5 and the cutter head driving unit 6 are connected to each other via a driving unit fixing bracket (driving unit fixing means) 8 having a substantially bowl-shaped cross section that can be attached and detached. Yes.
[0018]
As is clear from the partially enlarged view shown in FIG. 2A, the cutter head covering ring is slidable back and forth with respect to the front body skin plate 2 on the inner peripheral surface of the front end skin plate 2. 9 is inserted. Further, the cutter head driving unit support 5 includes a first holding jack (first holding mechanism) 10 as a cutter head covering holding jack and a second holding jack (second holding jack) as a front trunk skin plate holding jack. (Mechanism) 11 is mounted, and during normal excavation, the cutter head cover ring 9 is integrated with the cutter head driving unit support 5 by the extension of the first holding jack 10, and the movement in the front-rear direction is restricted. The front body skin plate 2 is integrated with the cutter head driving unit support 5 by the extension of the second holding jack 11, and the movement in the front-rear direction is restricted.
[0019]
The front plate of the cutter head 7 is provided with a center cutter 12 at the center, a number of cutter bits 13 provided radially from the center to the periphery, and an outer peripheral portion at a position near the periphery. A plurality of overcutter devices 14 for excavating the cutter head are provided so as to be able to protrude from the outer peripheral edge of the cutter head 7.
[0020]
Further, the bracket 15 fixed to the rear surface of the cutter head driving unit 6 is pin-supported at the base end portion of a plurality of middle-folded jacks 16, and the tip portion thereof is attached to the ring gutter 17 at the front end portion of the rear trunk skin plate 3. Pins are supported by the bracket 18 to be attached. In this way, the bending direction of the front body skin plate 2 with respect to the rear body skin plate 3 is controlled by selectively expanding and contracting the plurality of middle folding jacks 16.
[0021]
A plurality of shield jacks 19 are fixed to the ring gutter 17 via shield jack fixing brackets (first shield jack fixing means) 20. Each shield jack 19 is pin-supported on the rear surface of the cutter head drive unit support 5 on the base end side, and a spreader 22 for contacting the front end surface of the segment 21 to obtain a propulsion reaction force is provided at the rod front end portion. It is installed. The segment 21 is assembled by a segment erector (not shown). Further, the clearance between the segment 21 and the rear trunk skin plate 3 is stopped by a tail seal 23 provided at the rear end of the rear trunk skin plate 3.
[0022]
In contrast to such a draw-side shield machine 1, the insertion-side shield machine 30 has the same diameter as that of the draw-side shield machine 1 as shown in FIG. This is a shield machine known per se except that it has a configuration in which a cutter head having a slightly smaller diameter than the trunk part of the retracting shield machine 1 is slidable forward relative to the trunk part. The front torso skin plate 31 is provided at the front end of the rear torso skin plate 32 so as to be freely bent by the operation of the middle folding jack 34 via the fitting part 33, and the shield jack 35, the cutter head 36, the cutter head driving part 37, etc. It is configured with.
[0023]
Next, a tunnel underground joining procedure by the pull-in side shield machine 1 and the insertion-side shield machine 30 having the above-described configuration will be described with reference to FIGS.
[0024]
(1) Start of underground joint preparation (Fig. 3)
In the lead-side shield machine 1, after arriving at the joining position, the overcutter device 14 is contracted as indicated by the arrow A, and high-concentration mud is injected into the chamber 24 formed behind the cutter head 7. The chamber 24 is replaced with high-concentration mud. Next, a cutter head driving motor, a mud pipe, a mud pipe, a bypass pipe and the like (not shown) are removed. Thereafter, a shield jack fixing ring (second shield jack fixing means) 25 is carried in and fixed to the inner peripheral surface of the rear trunk skin plate 3 by welding, and the segment 21 is bolted to the shield jack fixing ring 25. To fix. Next, in order to replace the shield jack 19, the spreader 22 and the shield jack fixing ring 25 are fixed by bolt fastening, and the shield jack fixing bracket 20 is removed. Further, the driving unit fixing bracket 8 connecting the cutter head driving unit support 5 and the cutter head driving unit 6 is removed.
[0025]
On the other hand, in the insertion-side shield machine 30, after arriving in the vicinity of the joining position, the rear end portion of the connection bracket 39 fixed to the rear portion of the cutter head driving unit support 38 by bolt fastening, and the rear end of the bent jack 34. The front torso skin plate 31 and the back torso skin plate 32 are fixed by fastening bolts (B portion in the figure) to the front end of the bracket 40 that supports the end. Next, the bolt that fastens the front end portion of the connection bracket 39 and the cutter head driving portion support 38, in other words, the bolt at the portion C in the figure is removed, and the cutter head 36, the cutter head driving portion 37, and the cutter head driving portion are removed. The support 38 can be slid with respect to the front body skin plate 31.
[0026]
(2) Projection of the cutter head cover ring (Fig. 4)
In the lead-side shield machine 1, the first holding jack 10 and the second holding jack 11 are both operated in the contraction direction (arrow D direction) to connect the cutter head cover ring 9 and the cutter head drive unit support 5. Then, the connection between the front body skin plate 2 and the cutter head driving unit support 5 is released. Next, the front body skin plate 2 and the rear body skin plate 3 (E portion in the figure) are fixed by bolt fastening (front body / rear body connecting means) to integrate them. Thereafter, the shield jack 19 is operated in the extending direction (arrow F direction) (however, the arrow F indicates the moving direction of the shield jack main body), and as indicated by the arrow G, the cutter head driving unit support body. 5 and the cutter head cover ring 9 are advanced forward, the cutter head cover ring 9 covers the outer periphery of the cutter head 7, and the edge portion 9a at the tip of the cutter head cover ring 9 is bitten into the ground. Then, the cutter head cover ring 9 is fixed between the front head skin plate 2 and the cutter head cover ring 9 at a forward position of the cutter head cover ring 9 by a lock pin 26 (see FIG. 2B). Subsequently, after fixing the cutter head drive unit support 5 and the cutter head drive unit 6 with another drive unit fixing bracket (drive unit fixing means) 8 ', the bent jack 16 is removed.
[0027]
On the other hand, in the insertion-side shield machine 30, the folding jack 34 is extended and the cutter head 36 is rotated to dig, and only the cutter head 36, the cutter head drive unit 37, and the cutter head drive unit support 38 are moved forward. Slide to. Next, after sliding for a predetermined distance, the cutter head 36, the cutter head drive unit 37, the cutter head drive unit support 38, and the front body skin plate 31 are fixed by the spacer 41. Further, the bolt between the rear end portion of the connecting bracket 39 and the front end portion of the bracket 40 (B portion in the figure) is removed so that the front body skin plate 31 can be bent.
[0028]
(3) Retraction of the cutter head and the cutter head drive unit (FIG. 5)
In the draw-in side shield machine 1, the shield jack 19 is operated in the contraction direction, and the cutter head 7 and the cutter head drive unit 6 are slid rearward as indicated by an arrow H (see FIG. 2C). At this time, high-concentration muddy water is additionally injected into the chamber 24 of the draw-in shield machine 1 as necessary. After completion of the pull-in, the high-concentration mud is replaced with a solidified material.
[0029]
On the other hand, in the insertion side shield machine 30, the front part is penetrated into the drawing side shield machine 1 using the shield jack 35 (arrow I). At the time of this penetration, the digging direction of the insertion side shield digging machine 30 is corrected by the operation of the bent jack 34. The over cutter device 42 is stored before penetrating. And after making it penetrate to a predetermined position, a water stop agent is inject | poured into the fitting part of both shield machine 1 and 30 using an injection pipe, and water stop is performed.
[0030]
(4) Internal member removal and welding (Fig. 6)
When the joining of the shield machine 1 and 30 is completed in this way, the internal members are removed leaving the skin plates 2, 3; 31, 32 of each machine, and the inside of the skin plate (J portion in the figure) is welded, Ground bonding is completed.
[0031]
Next, an embodiment applied to a straight body type shield machine will be described. The longitudinal cross-sectional view of the shield machine (drawing side shield machine) which concerns on the 2nd Embodiment of this invention is shown by FIG.
[0032]
In the lead-side shield machine 1A of the present embodiment, the ring garter is configured with a straight body skin plate 2A and is fixed to the bracket 15 on the rear surface of the cutter head driving unit 6 and the skin plate 3. A plurality of drive unit holding connecting members 16 </ b> A are attached to the drive unit 17. Other than this, there is basically no difference from the first embodiment (the same applies to the insertion-side shield machine 30). Accordingly, the same reference numerals are given to the parts common to the first embodiment, and the detailed description thereof is omitted.
[0033]
Next, a tunnel underground joining procedure by the pull-in side shield machine 1A and the insertion-side shield machine 30 having the above-described configuration will be described with reference to FIGS.
[0034]
(1) Preparation for underground bonding started (Fig. 8)
In the lead-side shield machine 1A, after arriving at the joining position, the overcutter device 14 is contracted as shown by the arrow A, and high-concentration mud water is injected into the chamber 24 formed behind the cutter head 7. The chamber 24 is replaced with high-concentration mud. Next, a cutter head driving motor, a mud pipe, a mud pipe, a bypass pipe and the like (not shown) are removed. Thereafter, the shield jack fixing ring 25 is carried in and fixed to the inner peripheral surface of the skin plate 2A by welding, and the segment 21 is fixed to the shield jack fixing ring 25 by bolt fastening. Next, in order to replace the shield jack 19, the spreader 22 and the shield jack fixing ring 25 are fixed by bolt fastening, and the shield jack fixing bracket 20 is removed. Further, the driving unit fixing bracket 8 connecting the cutter head driving unit support 5 and the cutter head driving unit 6 is removed.
[0035]
On the other hand, in the insertion-side shield machine 30, after arriving in the vicinity of the joining position, the rear end portion of the connection bracket 39 fixed to the rear portion of the cutter head driving unit support 38 by bolt fastening, and the rear end of the bent jack 34. The front torso skin plate 31 and the back torso skin plate 32 are fixed by fastening bolts (B portion in the figure) to the front end of the bracket 40 that supports the end. Next, the bolt that fastens the front end portion of the connection bracket 39 and the cutter head driving portion support 38, in other words, the bolt at the portion C in the figure is removed, and the cutter head 36, the cutter head driving portion 37, and the cutter head driving portion are removed. The support 38 can be slid with respect to the front body skin plate 31.
[0036]
(2) Cutter head cover ring protrusion (Fig. 9)
In the lead-side shield machine 1A, the first holding jack 10 and the second holding jack 11 are both operated in the contraction direction (arrow D direction) to connect the cutter head cover ring 9 and the cutter head drive unit support 5 to each other. Further, the connection between the skin plate 2A and the cutter head driving unit support 5 is released. Next, the shield jack 19 is operated in the extending direction (arrow F direction), and as shown by the arrow G, the cutter head driving unit support 5 and the cutter head cover ring 9 are moved forward, and the cutter head cover ring 9 is moved forward. Thus, the outer periphery of the cutter head 7 is covered, and the edge portion 9a at the tip of the cutter head cover ring 9 is bitten into the ground. Then, the cutter head cover ring 9 is fixed between the cutter head cover ring 9 and the skin plate 2A by the lock pin 26 at the forward position of the cutter head cover ring 9 (see FIG. 2B). Subsequently, after the cutter head driving unit support 5 and the cutter head driving unit 6 are fixed by another driving unit fixing bracket 8 ', the driving unit holding connecting member 16A is removed.
[0037]
On the other hand, in the insertion-side shield machine 30, the folding jack 34 is extended and the cutter head 36 is rotated to dig, and only the cutter head 36, the cutter head drive unit 37, and the cutter head drive unit support 38 are moved forward. Slide to. Next, after sliding for a predetermined distance, the cutter head 36, the cutter head drive unit 37, the cutter head drive unit support 38, and the front body skin plate 31 are fixed by the spacer 41. Further, the bolt between the rear end portion of the connecting bracket 39 and the front end portion of the bracket 40 (B portion in the figure) is removed so that the front body skin plate 31 can be bent.
[0038]
(3) Retraction of the cutter head and the cutter head drive unit (FIG. 10)
In the lead-side shield machine 1A, the shield jack 19 is operated in the contraction direction, and the cutter head 7 and the cutter head drive unit 6 are slid rearward as indicated by the arrow H (see FIG. 2C). At this time, high-concentration muddy water is additionally injected into the chamber 24 of the draw-in shield machine 1 as necessary. After completion of the pull-in, the high-concentration mud is replaced with a solidified material.
[0039]
On the other hand, in the insertion-side shield machine 30, the shield jack 35 is used to penetrate the front portion of the insertion-side shield machine 30 while digging into the draw-side shield machine 1 </ b> A (arrow I). At the time of this penetration, the digging direction of the insertion side shield digging machine 30 is corrected by the operation of the bent jack 34. The over cutter device 42 is stored before penetrating. And after penetrating to a predetermined position, a water stop agent is inject | poured into the fitting part of both shield machine 1A, 30 using an injection pipe, and water stop is performed.
[0040]
(4) Internal member removal and welding (Fig. 11)
When the joining of both shield machines 1A, 30 is completed in this way, the internal members are removed leaving the skin plates 2A; 31, 32 of each machine, and the inside of the skin plate (J portion in the figure) is welded, Joining is complete.
[0041]
In the present embodiment, the drive unit holding connecting member 16A is attached from the normal excavation in the lead-side shield machine 1A. However, the connecting member 16A is attached before entering the underground joining work. Anyway.
[0042]
In each of the embodiments, when the cutter head cover ring 9 reaches the forward movement position, the lock pin 26 fixes the cutter head cover ring 9 and the front body skin plate 2 (or skin plate 2A). However, since the cutter head cover ring 9 may be fixed by a natural ground in the forward position, the lock pin 26 does not necessarily have to be mounted.
[0043]
In each of the above embodiments, the description has been given of the case where the shield jack fixing ring 25 is used to fix the rod end of the shield jack 19 to the segment 21 and the rear trunk skin plate 3 (or the skin plate 2A). It is not always necessary to use a ring-shaped fixing means, and the shape can be appropriately selected as long as it serves to fix the shield jack, the segment, and the skin plate to each other.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a shield machine (retraction-side shield machine) according to a first embodiment of the present invention.
FIG. 2 is a partially enlarged view of the front end portion in FIG. 1;
FIG. 3 is an explanatory diagram (1) of a tunnel underground junction procedure in the first embodiment.
FIG. 4 is an explanatory diagram (2) of a tunnel underground junction procedure according to the first embodiment.
FIG. 5 is an explanatory diagram (3) of a tunnel underground junction procedure according to the first embodiment;
FIG. 6 is an explanatory diagram (4) of a tunnel underground junction procedure in the first embodiment.
FIG. 7 is a longitudinal sectional view of a shield machine (retraction side shield machine) according to a second embodiment of the present invention.
FIG. 8 is an explanatory diagram (1) of a tunnel underground junction procedure in the second embodiment.
FIG. 9 is an explanatory diagram (2) of a tunnel underground junction procedure according to the second embodiment.
FIG. 10 is an explanatory diagram (3) of a tunnel underground junction procedure according to the second embodiment.
FIG. 11 is an explanatory diagram (4) of a tunnel underground junction procedure according to the second embodiment.
[Explanation of symbols]
1,1A Lead-side shield machine
2 Front body skin plate
2A skin plate
3 Rear trunk skin plate
5 Cutter head drive support
6 Cutter head drive
7 Cutter head
8,8 'drive unit fixing bracket (drive unit fixing means)
9 Cutter head covering
10 First holding jack (first holding mechanism)
11 Second holding jack (second holding mechanism)
14 Overcutter device
16 Folding jack
16A Driving part holding connecting member (connecting member)
19 Shield Jack
20 Shield jack fixing bracket (first shield jack fixing means)
21 segments
22 Spreader
25 Shield jack fixing ring (second shield jack fixing means)
26 Lock pin

Claims (2)

A skin plate, a cutter head drive support that is slidably inserted back and forth along the inner peripheral surface of the skin plate, and a slide back and forth along the inner peripheral surface of the cutter head drive support A cutter head driving unit that is fitted in, a cutter head that has an overcutter on the outer periphery and is rotatably supported in front of the cutter head driving unit, and a front end portion supported by the cutter head driving unit support. In a shield machine equipped with a shield jack,
A cutter head cover ring slidably inserted back and forth between the front end of the skin plate and the cutter head drive unit support, and holds the cutter head cover ring and the cutter head drive unit support so as not to move relative to each other. A first holding mechanism that can be held; a second holding mechanism that can hold the skin plate and the cutter head driving unit support member so as not to move relative to each other; and a connection that connects the cutter head driving unit and the skin plate. A first shield jack fixing means capable of fixing the member, the shield jack main body and the skin plate; and a second shield jack fixing capable of fixing the rod tip portion of the shield jack, the skin plate and the segment. And a driving unit fixing unit capable of fixing the cutter head driving unit and the cutter head driving unit support to each other. Shield machine, characterized in that it comprises means. A rear torso skin plate, a front torso skin plate that can be bent with respect to the rear torso skin plate, and a cutter head drive unit support that is slidably inserted back and forth along the inner peripheral surface of the front torso skin plate; The cutter head drive unit is slidably fitted back and forth along the inner peripheral surface of the cutter head drive unit support body, and the cutter head drive unit has an overcutter on the outer periphery and is rotatably supported in front of the cutter head drive unit. In a shield machine provided with a cutter head, a shield jack whose front end is supported by the cutter head drive unit support, and a bent jack that connects the cutter head drive unit and the rear trunk skin plate,
A cutter head cover ring that is slidably inserted back and forth between the front end portion of the front body skin plate and the cutter head drive unit support, and the cutter head cover ring and the cutter head drive unit support are not relatively movable. A first holding mechanism that can be held on the front body, a second holding mechanism that is capable of holding the front body skin plate and the cutter head driving unit support so as not to move relative to each other, the shield jack body, and the rear body skin plate. A first shield jack fixing means capable of fixing the front end skin plate, a second shield jack fixing means capable of fixing the rod tip portion of the shield jack, the rear trunk skin plate and the segment, and the front trunk skin plate; Front and rear torso connection means for connecting the rear torso skin plate so as not to bend, the cutter head drive unit, and the cutter head drive Shield machine, characterized in that it comprises a lockable driver fixing means mutual support.

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