JP2010222960A - Shield machine and method of constructing shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique on a shield machine having a movable deck which does not have a tendency to interfere with an erector device within a slewing range and does not cause a trouble with the assembling operation of the shield machine. <P>SOLUTION: This shield machine 1 having a screw conveyor 49 for soil discharge which extends from the front body part 3 toward the rear body part 5 includes a fixed deck 17 installed in the shield machine 1 and a movable deck 19 installed on the fixed deck 17. The movable deck 19 is so configured that one end of the deck part 21 serving as a work table is rotatably connected to the fixed deck 17 side so that it is not interfered with the erector device 11 for transporting segments by rotating in the plane of the shield machine 1 intersecting with the excavating direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a shield machine having a movable deck that can be deformed so as not to interfere with an erector apparatus, and a method for constructing the shield machine.
In the following, when the elector device includes a transport device that swivels and transports a segment, the swivel range of the transport device or a space defined as the swivel range may be referred to as a swivel range or swivel space of the elector device.

  Segments are assembled to the tunnel excavation surface dug by the shield machine. This assembly is performed by an erector device, but fastening of the segments with bolts is often performed manually by an operator, and it is necessary for the operator to approach the segment and visually check the position when finely adjusting the position. There are many cases. Therefore, the shield machine requires a work deck that serves as a scaffold for workers. Such work decks are roughly classified into those fixed to the shield machine (fixed deck) and movable (movable deck), and some have both a fixed deck and a movable deck.

  The work deck, including its components and attachments, must not interfere with the transport device during segment transport work by the erector device. Since the fixed deck is itself fixed, it should not interfere in any state of the erector device. On the other hand, since the movable deck itself is movable, it is necessary to evacuate it so that it does not interfere with the transportation of the segment of the erector device. After the transportation, the operator can access the segment as necessary. In order to do so, it is configured to project to the excavation wall surface side.

An example of a shield machine equipped with such a movable deck is disclosed in Patent Document 1, for example. The shield machine has a work deck having a plurality of stages of slide scaffold devices in the vertical direction, and each slide scaffold device is inside and outside the swivel range of the elector device at a timing that does not hinder the swivel operation of the elector device. It is comprised so that it becomes possible to provide a scaffolding.
Each scaffold device includes, as a work deck, a fixed scaffold (fixed deck) with a fixed handrail and a movable scaffold (movable deck) with a movable handrail provided slidably on the fixed scaffold.
(In the following explanation, the movable scaffold is a movable deck, and the fixed scaffold is a fixed deck, and the description is unified unless otherwise described in relation to the prior art.)

JP 2003-120198 A

In the prior art described above, in some of the plurality of slide scaffold devices, the sliding direction of the movable deck and the movable handrail is the digging direction, and the rest is the direction perpendicular to the digging direction.
When the movable deck slides in a direction perpendicular to the excavation direction, when the movable deck is retreated to the fixed deck side, the movable deck protrudes to the fixed deck side, that is, the center side of the shield machine.
However, if the movable deck is of a type that slides in a direction perpendicular to the excavation direction, it rises diagonally from the front torso side to the back torso side or from the front torso side to the rear. A mud type shield machine with screw conveyor installed, and a shield machine with a structure in which equipment, equipment, members, etc. (including a soil removal mechanism other than the screw conveyor) are installed in the machine body (particularly in the center of the machine) In such cases, the following inconveniences occur (for the sake of understanding, an example in which the devices, equipment, members, etc. installed in the machine body are screw conveyors for earth removal will be given. As will be described, it goes without saying that the present invention is not limited to this example).

  First, since the screw conveyor is arranged at the center of the shield machine, in the case of a sliding movable deck as shown in Patent Document 1, the movable deck moves when the movable deck slides to the fixed deck side. This causes a problem that the screw conveyor interferes. Such a problem may occur depending on various conditions such as the diameter of the shield machine, the arrangement angle of the screw conveyor, the work deck shape, and the segment assembly position.

In this case, the following countermeasures can be taken.
(i) Avoid interference with the screw conveyor by shifting the movable deck position forward, for example.
However, if it does in this way, it will shift from the position (= position where it is efficient for segment assembling work) which originally wants to extend a movable deck, and since it will also become near an elector device, usability will deteriorate.
(ii) The sliding stroke of the slide type movable deck is shortened and the movable deck is also made small so that it does not interfere with the screw conveyor 49 at the center of the shield machine even when stored.
However, if this is done, the amount of overhang of the movable deck becomes insufficient, and the usability deteriorates.
(iii) Move the movable deck installation position upward and place the movable deck at a position that does not interfere with the screw conveyor.
However, since the space above the deck is compressed, the usability is deteriorated not only as a movable deck but also as a fixed deck.

  Although it is possible to avoid interference with the screw conveyor by taking countermeasures even in the case of a slide type movable deck as described above, any of the countermeasures should or should be inherent in the movable deck It's a sacrificing function, and it's not enough.

  Also, if the shield machine has a small diameter, even if the movable deck tries to retreat, it interferes with the equipment (particularly the central part of the machine), equipment, members, etc. (including screw conveyors and other soil removal mechanisms). ), The movable deck may not be able to retract. In such a case, since it becomes difficult to install the slide scaffold device itself, the above measures themselves have no meaning.

Secondly, each block of the shield machine (front trunk, rear trunk, elector device, rear carriage, cutter drum, cutter disk, cutter motor, slewing bearing, shield jack, etc. 11))) After assembly is completed, as shown in Fig. 11, the general process is as follows: (i) Temporary assembly in the factory → (ii) Trial operation / witness inspection in the factory → (iii) Dismantling → (iv) Split transportation → (v) On-site assembly → (vi) On-site inspection / trial operation (In more detail, although there are some differences in the explanations below and the names and names of each process, Geotechnical Engineering / Practical Series 3 “Shield Method” From the survey and design to construction "(correction 2nd edition, issue: Geotechnical Society of Japan, release: Maruzen Co., Ltd.) pp. 149-155, etc.).
The “site” means a place where a shield machine is assembled or installed or temporarily placed for excavating a tunnel, or a place where at least one of the shield machine or a plurality of blocks constituting the shield machine is delivered. Say. “Factory” means a place where at least one of the shield machine or the plurality of blocks is manufactured or assembled before the plurality of blocks constituting the shield machine are transported to the site.

At this time, if it is a movable deck that interferes with the screw conveyor, while trying to avoid problems during assembly and disassembly caused by the interference, it complicates the assembly and disassembly of the shield machine. There is. That is, in the case of the movable deck that interferes with the screw conveyor, in the whole factory temporary assembly process of (i), the front barrel portion and the rear barrel portion are connected (equipped with a fixed deck). The movable deck cannot be installed until the relative positional relationship between the screw conveyor and the screw conveyor has been determined.In the dismantling process of (iii), the front and rear torso parts must be disassembled and removed first. Can not be dismantled (for example, relative separation), and in (iv) on-site assembly process, the same procedure as in (i) general temporary assembly process in factory is often followed. As in the case of the entire inner temporary assembly process, there arises a problem that the assembly timing of the movable deck is restricted. In addition, the fact that the assembly timing of the movable deck is restricted in the on-site assembly process of (iv) means that the movable deck must be dismantled and removed from the fixed deck side once in the previous disassembly process of (iii). It is also subject to another restriction.
When constructing a shield machine equipped with a screw conveyor and a sliding movable deck, the above-mentioned problems are often likely to occur. This also means that a deck and a shield machine equipped with it are desired).

  In addition, the shield machine assembled in the factory may be transported to the site as a single unit without being dismantled. For example, this is the case when the shield machine is transported by sea to the destination, and the smaller the shield machine is, the more suitable it is to be transported to the site without being disassembled. Such handling is generally as shown in Fig. 12. (i) Complete assembly in the factory → (ii) Trial operation and witness inspection in the factory → (iii) Transportation as a unit → (iv) On-site installation → (v) On-site It is a process of inspection / trial operation. At this time, if it is a movable deck that interferes with the screw conveyor, in the whole assembly process in the factory of (i), the front trunk part and the rear trunk part are connected (equipped with a fixed deck) There is a restriction that the movable deck cannot be installed until the relative positional relationship with the screw conveyor is determined. This is the same as the case of the flowchart shown in FIG.

  As described above, the shield machine has a soil removal mechanism such as a screw conveyor in the body (particularly in the center of the body) from the front torso side to the back torso side or from the front torso side to the rear. When the apparatus, equipment, members, etc. are provided, the fact that the movable deck installed in the shield machine is a sliding type causes various problems.

  The present invention has been made in view of the above problems, and a shield machine equipped with a movable deck that does not interfere with the turning range of the erector device and does not interfere with the assembly work of the shield machine, and It aims at providing each technique concerning the construction method.

  In order to achieve the above object, a shield machine according to a first embodiment of the present invention includes a shield equipped with a soil removal mechanism from the front trunk side toward the rear trunk side or from the front trunk side toward the rear. The excavator has a fixed deck installed in the shield excavator and a movable deck installed on the fixed deck, and the movable deck has one end side of a deck portion serving as a work table rotated to the fixed deck side. It is connected so that it can move, and it is comprised so that it may not interfere with the erector apparatus which conveys a segment by rotating in the surface which cross | intersects the digging direction of a shield machine.

  The shield machine according to the second embodiment of the present invention is the shield machine according to the first embodiment, wherein the movable deck includes a handrail that can be folded in a plane that intersects with the shield machine in the shield machine. It is a feature.

The shield machine according to the third aspect of the present invention is the one according to the first or second aspect, wherein the erector device includes a transport device that rotates and transports the segment,
The movable deck can be arranged together with the handrail at a position that does not interfere with the turning range inside the turning range of the transporting device in a plane that intersects the excavation direction.

  The shield machine according to a fourth aspect of the present invention is the one described in the second or third aspect, wherein the handrail includes a link mechanism that enables the movable deck to be interlocked with a rotating operation. It is what.

The construction method of the shield machine according to the fifth aspect of the present invention includes a front trunk part, a rear trunk part, and from the front trunk part side toward the rear trunk part side or from the front trunk part side toward the rear. A method of constructing a shield machine equipped with a soil removal mechanism to be installed,
A step of preparing in advance a fixed deck having a movable deck that rotates in a plane intersecting the direction of digging of the shield machine on the side surface of the fixed deck; and the rear trunk is installed behind the front trunk. Or at least a part of the screw conveyor on the front torso side before the installation of the rear torso behind the front torso is completed, and the fixing to the back torso And a step of installing a deck.

The construction method of the shield machine according to the sixth aspect of the present invention includes a front trunk part, a rear trunk part, and from the front trunk part side toward the rear trunk part side or from the front trunk part side toward the rear. A method of constructing a shield machine that includes a soil removal mechanism installed, a fixed deck installed in the rear trunk, and a movable deck installed in the fixed deck,
A step of installing the movable deck on the side surface of the fixed deck so as to rotate in a plane intersecting a digging direction of the shield machine, a step of installing a front trunk, and a rear of the front trunk A step of installing a lower side of the rear torso, a step of connecting a screw conveyor to the front torso side, a step of installing a fixed deck having the movable deck installed on the lower side of the rear torso, And a step of installing the upper side of the body portion.

  The construction method of the shield machine according to the seventh aspect of the present invention is the one according to the sixth aspect, wherein after the step of installing the upper side of the rear body part, the rear body part is moved to the front body part side. It has the process of pushing in.

The construction method of the shield machine according to the eighth aspect of the present invention includes a front trunk part, a rear trunk part, and from the front trunk part side toward the rear trunk part side or from the front trunk part side toward the rear. The earth removing mechanism to be installed, the fixed deck installed in the rear trunk, and the pivoting operation in the plane parallel to the cross section of the rear trunk on the side of the fixed deck installed on the fixed deck A method of constructing a shield machine with a movable deck
A dismantling process for disassembling the shield machine into a plurality of blocks, a separation transporting process for conveying the plurality of blocks to the site, and the shield without separating the movable deck and the fixed deck from the plurality of blocks. A local assembly process for assembling the excavator locally.

  The construction method of the shield machine according to the ninth aspect of the present invention relates to the eighth aspect, wherein the dismantling step separates the shield machine from the movable deck and the fixed deck in the factory. It is the process of disassembling into a plurality of blocks.

  The method for constructing a shield machine according to the tenth aspect of the present invention is the one according to the ninth aspect, wherein the shield machine is assembled in the factory without separating the movable deck and the fixed deck. It is characterized by being a shield machine.

The construction method of the shield machine according to the tenth aspect of the present invention includes a front trunk part, a rear trunk part, a soil removal mechanism installed from the front trunk part side toward the rear trunk part side, and the rear Shield comprising: a fixed deck installed on the trunk, and a movable deck installed on the fixed deck and pivoting in a plane parallel to the cross section of the rear trunk on the side of the fixed deck A method of building a digging machine,
In the factory, the process of assembling the shield machine without separating the movable deck and the fixed deck, and the process of transporting the shield machine that was assembled in the factory to the site without disassembling into a plurality of blocks, It is characterized by having.

Moreover, in description of said each form, entering / exiting with respect to the turning range of an elector apparatus means exiting from the turning range of an elector apparatus, and entering into the turning range of an elector apparatus, respectively. If it goes out of the turning range of an elector apparatus, since it will be arrange | positioned outside the turning range of an elector apparatus, it will be in the positional relationship which does not interfere with an elector apparatus. Moreover, since it will be arrange | positioned in the turning range of an elector apparatus if it enters into the turning range of an elector apparatus, it will be in the positional relationship which interferes with an elector apparatus.
Further, “in the plane intersecting the excavation direction” is intended to exclude those in which the rotation direction in the rotation operation of the deck portion serving as the work table is parallel to the excavation direction. However, considering that the deck section can better avoid the interference with the erector device by the turning operation, this "in-plane crossing the digging direction" is a direction that is close to the digging direction. More desirable.
“From the front trunk side to the rear trunk side” means “the traveling direction of the shield machine (front), regardless of whether or not the middle trunk exists between the front trunk and the rear trunk. Meaning “in the opposite direction (backward)”, and “from the front to the rear side” is also synonymous. A typical example of the “soil discharging mechanism” is a screw conveyor for soil discharging, but is not limited thereto.

The shield machine according to the first embodiment of the present invention is a shield machine equipped with a soil removal mechanism installed from the front trunk side toward the rear trunk side or from the front trunk side toward the rear. A fixed deck installed in the shield machine and a movable deck installed on the fixed deck, and the movable deck is pivotally connected to the fixed deck side at one end side of the deck portion serving as a work table. And it is comprised so that it may not interfere with the erector apparatus which conveys a segment by rotating in the surface which cross | intersects the digging direction of a shield machine. Therefore, according to the first embodiment, there is no fear of interfering with the soil removal mechanism arranged on the fixed deck side. Therefore, the movable deck can be arranged regardless of the arrangement state of the soil removal mechanism, and as a result, a shield machine that is safe for workers and equipped with an easy-to-use movable deck can be realized. In addition, since there is no risk of interference with the soil removal mechanism during on-site assembly, it is possible to permanently fix (weld) the movable deck to the fixed deck before shipment from the factory, simplifying the on-site construction process (shortening the construction period). I can plan.
In addition, if the movable deck is as described above, it can be installed even if the shield machine has a small diameter as well as a large diameter, thus realizing a small-diameter shield machine with a movable deck. it can.

In the shield machine according to the second aspect of the present invention, the movable deck includes a handrail that can be folded in a plane that intersects the direction of the shield machine. Therefore, according to the second embodiment, since the space required for the deformation can be reduced, it becomes a shield machine equipped with a movable deck that is more compact and less bulky. In addition, the developed handrail provides a shield machine with excellent safety that can further enhance the safety of workers.
If the handrail can be folded by rotating, it can be vertically deformed when viewed as the entire movable deck. With such a configuration, a more compact shield machine that requires less space for deformation in the vertical direction can be obtained.

  In the shield machine according to the third aspect of the present invention, the movable deck has a handrail at a position that does not interfere with the turning range on the inner side of the turning range of the transporting device provided in the elector device, in a plane that intersects the turning direction. Can be placed together. Therefore, according to the third embodiment, a shield machine equipped with a desirable movable deck and fixed deck can be realized regardless of the diameter of the shield machine.

Since the shield machine according to the fourth aspect of the present invention includes the link mechanism that enables the movable deck to be interlocked with the pivoting operation, a separate driving source is not required for the handrail folding operation. Therefore, according to the fourth embodiment, since a separate driving source and actuator are not used for the folding operation of the handrail, the risk of their failure occurrence is low, and the shield machine can be installed in a compact space as in the prior art. .
Further, if the movable deck is configured to be interlocked with the pivoting operation, the handrail can be installed in a usable state when the movable deck is required, and the operator installs the handrail separately. It is possible to make a shield machine with a reasonable structure without burden.

  According to the method for constructing a shield machine according to the fifth aspect of the present invention, a fixed deck including a movable deck that rotates in a plane that intersects with the shield tunneling direction on the side surface of the fixed deck in advance. Since it is prepared, it is not necessary to install a movable deck when constructing a shield machine in the field (for example, in a battle). In addition, since the movable deck that rotates on the side surface of the fixed deck does not interfere with the soil removal mechanism, the soil removal mechanism does not get in the way when the fixed deck is installed on the rear trunk. Accordingly, the construction work of the shield machine can be speeded up (and the work period can be shortened).

  According to the construction method of the shield machine according to the sixth aspect of the present invention, when the fixed deck is installed on the lower side of the rear trunk, or the installation of the fixed deck on the lower side of the rear trunk is completed. Before, since the movable deck has already been installed on the fixed deck, the same effect as that produced by the method for constructing the shield machine according to the fifth embodiment is achieved. In other words, when constructing a shield machine on the spot (for example, against a ground), there is no need to install a movable deck, and when a fixed deck is installed on the rear trunk, the earth removal mechanism does not get in the way. The construction work of the machine can be speeded up (and the work period can be shortened).

  According to the method for constructing the shield machine according to the seventh aspect of the present invention, after the step of installing the upper side of the rear torso, the step of pushing the rear torso into the front torso is provided. A folding shield machine can be constructed. This can be realized because the movable deck does not extend to the fixed deck side, and there is no concern that the movable deck interferes with the screw conveyor even if the rear trunk portion is moved relative to the front trunk portion side.

  According to the construction method of the shield machine according to the eighth aspect of the present invention, the shield excavator is installed on the fixed deck and rotates on a side surface of the fixed deck in a plane parallel to the cross section of the rear trunk portion. Since it is equipped with a movable deck, after disassembling the shield machine into a plurality of blocks and transporting it to the site, the shield machine can be assembled without separating the movable deck and the fixed deck. The construction work of the shield machine will be accelerated (and the construction period will be shortened).

  Also in the construction method of the shield machine according to the ninth aspect of the present invention, the movable machine is installed on the fixed deck and rotates on the side surface of the fixed deck in a plane parallel to the cross section of the rear trunk portion. Because it is equipped with a deck, the shield machine can be disassembled into a plurality of blocks without separating the movable deck and the fixed deck at the factory during the dismantling process. Work can be further speeded up (and the work period can be shortened).

  Also in the construction method of the shield machine according to the tenth aspect of the present invention, the movable machine is installed on the fixed deck and rotates on the side surface of the fixed deck in a plane parallel to the cross section of the rear trunk portion. Because it is equipped with a deck, the shield machine can be assembled at the factory without separating the movable deck and the fixed deck, and the movable deck and the fixed deck are separated at the stage of assembling the shield machine at the factory. Therefore, it is possible to further speed up the construction work of the shield machine (and shorten the construction period).

    According to the construction method of the shield machine according to the eleventh aspect of the present invention, the shield excavator is installed on the fixed deck and rotates on the side surface of the fixed deck in a plane parallel to the cross section of the rear trunk portion. Because it is equipped with a movable deck, even if the shield machine that was assembled at the factory is transported to the site as an integral part without being dismantled, the movable deck and the fixed deck at the stage of assembling the shield machine at the factory Therefore, the construction work of the shield machine can be speeded up (and the construction period can be shortened).

  The effect which the other form of this invention show | plays is demonstrated in embodiment or the Example of this invention.

It is a top view inside the shield machine which concerns on one embodiment of this invention. It is a side view inside the shield machine which concerns on one embodiment of this invention. It is explanatory drawing of an erector apparatus. It is explanatory drawing of the movable deck installed in the shield machine which concerns on one embodiment of this invention. It is operation | movement explanatory drawing of the movable deck installed in the shield machine which concerns on one embodiment of this invention. It is operation | movement explanatory drawing of the movable deck installed in the shield machine which concerns on one embodiment of this invention. It is operation | movement explanatory drawing of the movable deck installed in the shield machine which concerns on one embodiment of this invention. It is operation | movement explanatory drawing of the movable deck installed in the shield machine which concerns on one embodiment of this invention. It is explanatory drawing of the construction method of the shield machine which concerns on one embodiment of this invention. It is explanatory drawing of the construction method of the shield machine which concerns on one embodiment of this invention. It is a flowchart which shows the process after the assembly completion of each block of a shield machine. It is another flowchart which shows the process after the assembly completion of each block of a shield machine.

Hereinafter, the present invention will be described in detail by embodiments or examples. In that case, the description will be made with reference to the drawings as necessary, but in each of the drawings, the same parts or corresponding or common parts are denoted by common reference numerals, and a part of the description may be omitted.
Needless to say, the present invention is not limited to the embodiments and examples described in the drawings. The technical scope of the present invention is not limited by these embodiments, and can be implemented in various forms without changing the gist of the invention. Further, the technical scope of the present invention extends to an equivalent range, and the definition of the term relating to the present invention does not preclude its equivalent application.

[Embodiment 1]
FIG. 1 is an explanatory view for explaining the internal structure of the shield machine according to the present embodiment, a plan view of the shield machine, and FIG. 2 is a side view of the shield machine equipped with the movable deck of the present embodiment. FIG. 3 is an explanatory diagram of an erector apparatus installed in the shield machine according to the present embodiment, and FIGS. 4 to 8 are explanatory diagrams of a movable deck installed in the shield machine according to the embodiment of the present invention. .

The shield machine 1 includes a front body portion 3 and a rear body portion 5. A cutter head 7 is provided at the front end of the front body 3. A shield jack 9 for propelling the shield machine 1 is installed from the rear part of the front trunk part 3 to the rear trunk part 5. And immediately behind this shield jack 9, there is provided an erector device 11 that holds the segment 10 and transports and installs it to a desired position (see FIG. 3). The erector apparatus 11 includes a grip 13 that grips the segment 10 and an arm 15 that moves the grip 13 to a desired position.
A fixed deck 17 is installed behind the erector device 11.
Further, a screw conveyor 49 for earth removal is installed so as to extend obliquely upward from the front trunk portion 3 toward the rear trunk portion 5. The rear end portion of the screw conveyor 49 extends above the fixed deck 17.
A movable deck 19 is installed on both sides of the upper portion of the fixed deck 17 and the front side.
The movable deck 19 is installed at a position that does not interfere with the turning range on the inner side of the turning range of the arm portion 15 of the erector apparatus 11 so that it can be easily inferred from the arrangement of FIG.

The movable deck 19 is configured to be rotatable in a plane orthogonal to the traveling direction of the shield machine 1. In FIG. 1, the movable deck 19 set on the left side from the rear to the front of the shield machine 1 is in a horizontal state and can be used, and the right movable deck 19 has the tip side below. It is in a state where it cannot be used by rotating so as to face.
In FIG. 1, the structure of the movable deck 19 is shown in a simplified manner.

  As understood from the above description, the movable deck 19 is installed on the fixed deck 17 in the rear trunk portion 5 of the shield machine 1 and is located at a position that does not interfere with the turning range inside the turning range of the erector device 11. Since it is arranged, it enters or exits the turning range of the erector apparatus 11 according to the operating status of the erector apparatus 11.

  Next, the structure of the movable deck 19 installed in the shield machine 1 of the present embodiment will be described based on FIG. FIG. 4 shows a state in which the movable deck 19 extends outward and can be used. FIG. 4 (a) is a perspective view and FIG. 4 (b) is a side view. In addition, FIGS. 5-7 is suitably referred when needed for description.

The movable deck 19 is attached to the fixed deck 17 via a bracket 20 installed on the fixed deck 17. The bracket 20 for attaching the movable deck 19 to the fixed deck 17 is formed in a substantially rectangular frame shape, and its upper side is fixed to the upper surface of the fixed deck 17 and its lower side is stuck to the outer side of the fixed deck 17. Is installed.
Note that the movable deck 19 may not be attached via the bracket 20 as shown in this example, but may be substituted if there is a member for attaching the movable deck 19 to the fixed deck 17 side.

The movable deck 19 includes a deck portion 21 that can be rotated in a plane substantially orthogonal to the traveling direction of the shield machine 1, a folding handrail 23 that performs a folding operation in conjunction with the rotation of the deck portion 21, and a deck. And a drive mechanism unit 25 that drives the rotation of the unit 21.
The deck unit 21 includes a rectangular deck frame 27 and a deck plate 29 that is installed in the frame of the deck frame 27 and serves as a work table. And the deck part 21 is attached to the bracket 20 by installing the both ends of the deck frame 27 to a position slightly above the middle of the vertical side of the bracket 20 so as to be rotatable.

The foldable handrail 23 includes a side handrail 31 disposed on both sides of the deck portion 21 and a front handrail 33 provided on the front portion of the deck portion 21. The side handrail 31 is configured by a pair of pipe members having one end side rotatably connected to the upper end portion of the bracket 20 and the other end side pin-connected to the front handrail 33. The front handrail 33 is formed of a tube member as in the case of the side handrail 31, and has a rectangular frame portion 35 whose lower end is rotatably attached to the distal end side of the deck frame 27, and an inverted U-shape on the upper side of the rectangular frame portion 35. The reverse U-shaped part 37 formed in the structure is connected.
The folding handrail 23 configured as described above surrounds both side portions and the front portion of the deck portion 21 so that an operator on the deck portion 21 can be prevented from falling from the deck portion 21.

The drive mechanism unit 25 has a rectangular frame-shaped first drive frame member 39 that is pivotally attached to the lower portion of the bracket 20 on the base end side, and one end side that is pivotally connected to the distal end side of the first drive frame member 39. The second drive frame member 41 having a rectangular frame shape whose other end side is rotatably connected to the front end side of the deck frame 27, and the main body 43 are rotatably attached to the bracket 20, and the front end of the rod 45 is The first drive frame member 39 is provided with a pair of drive jacks 47 connected via a rotation shaft.
The drive mechanism unit 25 configured in this manner rotates the first drive frame member 39 by extending and contracting the rod 45 of the drive jack 47, and the second drive frame member 41 is interlocked with this, Further, the deck portion 21 is rotated in conjunction with the rotation of the second drive frame member 41, and the folding and folding operation of the folding handrail 23 is performed.

5 to 8 are operation explanatory views for explaining the operation of the movable deck 19 configured as described above, and FIG. 5 is a view in which the front end side of the deck portion 21 faces obliquely downward and the folding handrail 23 is folded. Indicates the state. 6 and subsequent figures show the state in which the deck portion 21 rotates from the state of FIG. 5, and the state of FIG. 7 is the deck portion 21 being used with the deck portion 21 being substantially horizontal as in FIG. A state in which the foldable handrail 23 is assembled (installed state) is shown while being possible. FIG. 8 continuously shows the side views shown in FIGS.
Hereinafter, the operation of the movable deck 19 will be described with reference to FIGS.

  As shown in FIG. 5, the folding handrail 23 is in a folded state when the front end side of the deck portion 21 is in an obliquely downward direction. In this state, the entire deck portion 21 is disposed close to the side portion of the fixed deck 17. Further, the front handrail 33 and the side handrail 31 in the foldable handrail 23 are arranged so as to fall over the deck plate 29 of the deck portion 21. Therefore, in the state shown in FIG. 5, the entire movable handrail is disposed so as to stick to the side surface of the fixed deck 17, and is in a position that does not interfere with the turning range inside the turning range of the elector device 11 and interferes with the elector device 11. Never do.

When the rod 45 of the drive jack 47 is extended from the state shown in FIG. 5, the first drive frame member 39 rotates in the direction indicated by the arrow A in FIG. Operates to be extruded. Further, the second drive frame member 41 is entirely pushed outward in conjunction with the operation of the first drive frame member 39, and is shown by an arrow B in FIG. Rotate in the direction. Further, in conjunction with the operation of the second drive frame member 41, the deck portion 21 rotates in the direction indicated by the arrow C in FIG. Further, as the deck portion 21 rotates, the front handrail 33 connected thereto rotates in the direction indicated by the arrow D in FIG. 6B with the lower end side as the fulcrum of rotation, and accordingly. The side handrail 31 rotates in the direction indicated by the arrow E in FIG. 6B with the base end side as the fulcrum of rotation.
That is, when the rod 45 of the drive jack 47 starts to extend, the deck portion 21 starts to protrude, and the folding handrail 23 has a rectangular frame surrounding the deck portion 21 as shown in FIG. It will be assembled into a shape.

  Further, when the rod 45 of the drive jack 47 is extended, each member constituting the movable deck 19 further rotates from the state shown in FIG. Then, as shown in FIG. 7, the deck portion 21 becomes substantially horizontal, the front handrail 33 rises vertically, and the side handrail 31 becomes substantially horizontal. In this state, the folding handrail 23 is fully folded, that is, assembled, side handrails 31 are installed on both sides of the deck section 21, and a front handrail 33 is installed on the front end of the deck section 21. Thus, the deck portion 21 is surrounded. The front handrail 33 has a two-stage structure of a rectangular frame portion and an inverted U-shaped frame portion, and has a height, so that the operator can be reliably prevented from falling.

When an operator gets on the deck portion 21 in this state, the force acting on the deck portion 21 acts to rotate the second drive frame member 41 and the first drive frame member 39. Therefore, it is necessary to provide a stopper for preventing these members from rotating.
In the present embodiment, as shown in FIG. 7B, the outer angle α formed by the first drive frame member 39 and the second drive frame member 41 is set to exceed 180 °. When an operator rides on the deck portion 21, a load is applied to the first drive frame member 39 via the second drive frame member 41. The direction of the acting force causes the first drive frame member 39 to change to the first drive frame member 39 in FIG. It becomes the direction shown by the arrow A in b), and this is the direction in which the rod 45 of the drive jack 47 is extended. Therefore, if it is set so that the rod 45 of the drive jack 47 is fully extended in the state shown in FIG. 7, the rod 45 does not extend any further, and the rod 45 restricts the rotation of the first drive frame member 39. Functions as a stopper. Therefore, even if a malfunction such as an oil leak from the hydraulic hose occurs, the movable deck 19 does not rotate and is safe.
In this embodiment, since the rod 45 of the drive jack 47 is set to the maximum extension in the state where the deck portion 21 of the movable deck 19 is horizontal as shown in FIG. There is no need to provide it. However, a mechanical stopper for restricting the rotation between the members constituting the drive mechanism portion 25 in a state where the deck portion 21 is set horizontally may be provided, and in this way, the safety is further improved. Increase.

In addition, when the movable deck 19 is stopped in the middle of the overhanging operation, it is dangerous because the installation of the folding handrail 23 is insufficient or the deck portion 21 is inclined. It is desirable to provide a safety mechanism as shown.
<Safety mechanism>
A limit switch (hereinafter referred to as “LS”) capable of detecting the “deck extension completion state” is provided in the drive jack 47 or the movable deck 19 main body, and the procedure for use is performed as follows.
(i) An operator instructs an extension operation of the movable deck 19 by pressing an operation switch, for example.
(ii) The drive jack 47 starts a predetermined operation (generally a rod extension operation).
(iii) When the LS is detected, the drive jack 47 automatically stops the predetermined operation, and at the same time, the operation completion notifying device (or lamp) installed separately "moves the movable deck over" Give a signal to let you know. Note that the operation completion notification may be “voice (including buzzer sound)” or “combination of voice and rotating lamp rotation (visual display)”.
(iv) An operator (a person who gets into the movable deck 19) gets on the work deck after confirming the above three signals.
It should be noted that another safety fence (handrail) is provided near the entrance of the movable deck 19 so that the safety fence can be automatically opened after “extension is completed” or the safety fence is automatically unlocked. Alternatively, the safety fence may be opened manually.

Next, the operation of rotating the movable deck 19 configured as described above from the state shown in FIG. 7 to the fixed deck 17 side to return to the state shown in FIG. 5 will be described. The operation in this case is the reverse of the operation shown in FIGS. That is, when the rod 45 of the drive jack 47 is retracted from the state shown in FIG. 7, the first drive frame member 39, the second drive frame member 41, the deck portion 21, the front handrail 33, and the side handrail 31. Are rotated in directions opposite to the arrows A to E shown in FIG. In accordance with such a rotation operation, the deck portion 21 approaches the fixed deck 17 side, and the folding handrail 23 is also folded on the deck portion 21 side and close to the fixed deck 17 side together with the deck portion 21. Eventually, the state shown in FIG. 5 is obtained.
In the state of FIG. 5, the movable deck 19 is located in a position that does not interfere with the turning range inside the turning range of the elector device 11, and does not interfere with the elector device 11.

  FIG. 8 is a diagram in which (b) views of FIGS. 5 to 7 are arranged in order from the top as (A) to (C). The deck portion 21 rotates and the foldable handrail 23. FIG. 6 is an explanatory diagram for explaining a situation in which is installed in an expanded manner in conjunction with the turning operation of the deck section 21.

<About the rotation of the deck>
As described above, the deck portion 21 is pivotally connected to the bracket 20 at the base end side, and rotates in the direction indicated by the arrow C in FIG.
In FIG. 8B, arrows are attached to both ends of the arrow C in order to show that it can be rotated in both directions in the state of FIG. 8B. The same applies to arrows D and E described later.

<Operation of folding handrail>
1. Side as pivoting operation The front handrail 33 constituting the folding handrail 23 is pivotally connected to the second drive frame member 41 of the drive mechanism unit 25 at the lower end side. Is rotated in the direction indicated by the arrow D in FIG.
Further, the side handrail 31 rotates in the direction indicated by the arrow E in FIG. Since the foldable handrail 23 is composed of the front handrail 33 and the side handrail 31, it can be seen that the foldable handrail 23 is rotating as a whole.

2. Side as Translational Movement Operation of the side handrail 31 described in the above 1 is also an operation having a component that moves horizontally between the shield machine and the tunnel wall surface excavated thereby. That is, the side handrail 31 is rotated as indicated by an arrow E in FIG. 8 as the deck portion 21 is rotated as indicated by an arrow C in FIG. When this pivoting motion of the side handrail 31 is projected in the horizontal direction, the horizontal direction (especially the shield machine and the tunnel wall surface excavated thereby) moves in the horizontal direction in the range indicated by the arrow S in FIG. Between the horizontal direction). The front handrail 33 rotates as shown by an arrow D in FIG. 8 along with the turning operation of the deck portion 21 as shown by an arrow C in FIG. With horizontal movement between the machine and the tunnel wall excavated thereby. Further, the front handrail 33 moves horizontally by a distance close to the horizontal distance indicated by the arrow S in FIG. 8 as the deck portion 81 rotates as indicated by the arrow C in FIG. In short, both the side handrail 31 and the front handrail 33 constituting the foldable handrail 23 perform an operation involving a horizontal movement component in accordance with the rotation operation of the deck portion 21.

<About interlocking with the turning motion of the deck part 21 of the folding handrail>
As described above, the turning operation of the folding handrail 23 is performed in conjunction with the turning operation of the deck portion 21 by the front handrail 33 directly connected to the deck portion 21. The folding handrail 23 performs a folding operation and a folding operation in conjunction with the rotation operation. Therefore, the folding handrail 23 rotates in conjunction with the rotation operation of the deck portion 21 and performs the folding operation.
Further, as described above, the side handrail 31 and the front handrail 33 constituting the foldable handrail 23 both perform the movement operation accompanied by the horizontal movement component in conjunction with the rotational movement of the deck portion 21. .

  As described above, in the case of a mud type like the shield machine 1 of the present embodiment, the screw conveyor 49 is installed obliquely from the front trunk part to the rear trunk part of the shield machine 1. However, in the shield machine 1 of the present embodiment, since the movable movable deck 19 is installed on the side of the fixed deck 17, it is not necessary to consider interference with the screw conveyor 49. Therefore, the movable deck 19 can be freely arranged regardless of the arrangement state of the screw conveyor 49. As a result, it is possible to install the movable deck 19 at a position where the movable deck 19 is originally intended to be extended, to secure a sufficient amount of overhang, and to provide a movable deck 19 that is easy to use without pressing the space on the fixed deck 17 side. The shield machine 1 can be realized.

The movable deck 19 has the following advantages.
(1) Since the movable deck 19 rotates with the deck portion 21 as a fulcrum in the plane perpendicular to the traveling direction of the shield machine 1, the tip of the movable deck 19 faces downward and the fixed deck 17. In the state of being close to the side, it is possible to reliably enter the position that does not interfere with the turning range on the inner side of the turning range of the arm of the elector device 11, and therefore it is possible to reliably avoid interference with the elector device 11. Moreover, in the movable deck 19, when the deck part 21 rotates in the protruding direction, the folding handrail 23 is assembled in conjunction with the operation, and the deck part 21 rotates toward the fixed deck 17 side. When the foldable handrail 23 is moved or folded in conjunction with the operation, the space required for the deformation can be reduced. Therefore, it is a movable deck that can be installed even when the shield machine has a large diameter, as well as a small diameter.

(2) In the movable deck 19, installation and removal operation | movement of an individual handrail become unnecessary. That is, since the movable deck 19 is equipped with the folding handrail 23 that is automatically installed in conjunction with the operation, the handrail is always set when the movable deck 19 is used without the operator being aware of it. Therefore, the safety when using the movable deck 19 is improved. Further, since the handrail operates without using a special actuator or the like, the risk of failure of the actuator or the like is low, and it can be installed in a compact space as in the past.

(3) The movable deck 19 operates so as to project outward from the side surface side of the fixed deck 17 with the base end side as a fulcrum of rotation, so the inside of the fixed deck 17 (that is, the body axis of the shield machine) On the side), the members constituting the movable deck 19 are not arranged. Therefore, it is not necessary to secure a space for installing the members related to the movable deck 19 on the fixed deck 17 side, and installed on the fixed deck 17 side. It is not necessary to consider interference with the member to be processed.

  Therefore, by providing the movable deck 19, a shield machine (for example, a small space occupied by the movable deck and yet a safe shield machine) that exhibits the effects of the movable deck 19 described above can be realized. Can do.

In addition, as operation | movement of the electre apparatus 11, when performing turning operation | movement at the speed | rate at the time of normal work (normal speed turning operation | movement) like performing segment assembly operation | movement, operation | movement slower than normal speed turning operation | movement is performed. Slow turn operation can be performed. Therefore, it is desirable for safety to associate the operation of the erector apparatus 11 with the operation of the movable deck 19.
As a specific means for that purpose, the retracted state of the movable deck 19 (the state where the tip of the deck portion 21 faces downward and close to the fixed deck 17 side) is monitored by a limit switch, and the movable deck 19 is retracted. It is only necessary to program the interlock so as to permit the normal speed turning to the erector apparatus 11 and to control based on this program only when the erector apparatus 11 is on. If it does in this way, when the deck part 21 begins to rotate and the limit switch is turned off, the interlock works on the side of the erector apparatus 11 and the erector apparatus 11 stops.
Further, in order to further increase the safety, in addition to the above control, an interlock is programmed on the movable deck 19 side, and the movable deck 19 is controlled not to operate when the erector apparatus 11 is performing the normal speed turning operation. do it.

[Embodiment 2]
An example of the process after the completion of the factory of the shield machine 1 is as follows: (i) Temporary assembly in the factory → (ii) Factory test and witness inspection → (iii) Demolition → (iv) Split transportation → (v) On-site assembly → (vi) On-site inspection / trial operation (see Fig. 11).
At this time, if the movable deck interferes with the screw conveyor, the construction process of the shield machine becomes complicated. That is, in (i) the entire factory temporary assembly process, the front barrel portion and the rear barrel portion are connected (equipped with a fixed deck) and the relative positional relationship between the rear barrel portion and the screw conveyor is determined. Otherwise, the movable deck cannot be installed.In the disassembly process of (iii), the front and rear torso parts cannot be disassembled (e.g., relative separation) unless the movable deck is disassembled first. In (iv) on-site assembly process, the same procedure as in (i) whole factory temporary assembly process is often used. There arises a problem that the assembly timing is limited. In addition, the fact that the assembly timing of the movable deck is restricted in the on-site assembly process of (iv) means that the movable deck must be dismantled and removed from the fixed deck side once in the previous disassembly process of (iii). It is also subject to another restriction.
On the other hand, if it is a shield machine provided with the movable deck 19 demonstrated in Embodiment 1, since the above problems and restrictions will not arise, the construction process of a shield machine can be simplified.
This point will be specifically described below.

FIG. 9 and FIG. 10 are explanatory diagrams for explaining the assembly process of the shield machine 1 including the screw conveyor 49, and shows how the assembly proceeds in the order of (a) to (f) in the drawing.
Hereinafter, an assembly process of the shield machine 1 including the screw conveyor 49 will be outlined based on FIGS. Note that the shield machine whose assembly process is illustrated in FIGS. 9 and 10 is a folding shield machine.

 (i) First, the movable deck 19 is installed on the fixed deck 17 in a factory or other place, and other members and blocks constituting the shield machine 1 are also manufactured. Next, in the factory, the entire shield machine 1 is assembled from these members and blocks. When the assembled shield machine is disassembled and transported to the site, temporary assembly is appropriate (see step (i) shown in FIG. 11), and the assembled shield machine is disassembled. In the case where the product is transported to the site as a single unit, the present assembly is appropriate instead of the temporary assembly (see (i) shown in FIG. 12). In any case, the movable deck 19 does not extend to the fixed deck 17 side, and therefore does not interfere with the screw conveyor 49. Therefore, when assembling the shield machine, the front trunk portion and the rear trunk portion Are connected (equipped with a fixed deck), and the relative positional relationship between the rear barrel and the screw conveyor must be determined before the movable deck can be installed. , At least when assembling the shield machine in the factory, the assembly process can be simplified).

(ii) After the trial run and the witness test of the shield machine assembled in the factory (see step (ii) shown in FIG. 11), the shield machine is disassembled into a plurality of blocks (shown in FIG. 11). When the necessary packing is applied to the plurality of blocks and transported to the site (see step (iv) shown in FIG. 11), the movable deck 19 extends to the fixed deck 17 side. Therefore, there is no interference with the screw conveyor 49, so there is no restriction on the process / procedure and the dismantling becomes easy (so at least when dismantling the shield machine at the factory, Can be simplified).
If the assembled shield machine is to be transported to the site as a single unit without being dismantled, after the trial run and witness inspection have been completed at the factory (see Fig. 12 (ii)), it will be transported, and After the installation, the necessary inspection and trial run are performed (Fig. 12 (iv) (v)).

(iii) When assembling a shield machine disassembled into a plurality of blocks on site (see step (v) shown in FIG. 11), first, the shield machine is divided into upper and lower parts on a start stand (not shown) under the start of the start. In addition, most of the front body side devices such as the front body 3 (lower front body 3a) (upper front body 3b), cutter driving unit (not shown), cutter head 7 and the like are put in and temporarily assembled. FIG. 9A shows a state where the temporary assembly is completed.
Next, the lower rear trunk part 5a which is the lower half of the rear trunk part 5 of the half split structure is introduced (FIG. 9B). When assembling the folding shield engraving machine, the rear body 5 is positioned slightly rearward from the front body 3 in consideration of welding work in the subsequent process and the entry and exit of workers, specifically the rear body. It is preferable to temporarily place the gap so that a gap is formed between the middle bent portion 6 installed in the portion 5 and the front trunk portion 3, and the gap becomes a level that allows welding work and entry / exit of workers.
(iv) Subsequently, the screw conveyor 49 is introduced from above the lower rear barrel portion 5a, and is connected and installed on the front barrel portion 3 side (FIG. 9C). When the screw conveyor 49 is configured by connecting a plurality of parts, the head part of the screw conveyor 49 is first connected to the front barrel 3a side, the next part is connected to the head part, and the next part is further connected. It is only necessary to complete the entire screw conveyor 49 by repeating the operation of connecting the above-mentioned parts as many times as necessary. Only a part of the screw conveyor 49 may be configured first, and the remaining part of the scooter conveyor 49 may be configured after the following operations (v) and subsequent steps are performed.
(v) The fixed deck 17 on which the movable deck 19 is installed is thrown in and temporarily fixed to the support in the lower rear trunk 5a (FIG. 13D). Since the movable deck 19 is installed on the fixed deck 17, the relative position with respect to the fixed deck 17 does not change, but at this time, the relative position of the rear body 5 with respect to the front body 3 is behind the normal position. It is shifted to. At this time, if the movable deck 19 extends to the fixed deck 17 side like a slide type, the movable deck 19 should interfere with the screw conveyor 49.
However, in practice, the movable deck 19 does not extend to the fixed deck 17 side, so that it does not interfere with the screw conveyor 49 and can be installed in advance. (Therefore, when assembling the shield machine at least on site, it is not necessary to separate the movable deck and the fixed deck, and the on-site assembly process (see step (v) shown in FIG. 11) can be simplified).
(vi) Next, the upper rear barrel 5b, which is the upper half of the rear barrel 5, is introduced and temporarily fixed to the lower rear barrel 5a (FIG. 10 (e)).
(vii) Then, after the main assembly (including welding work) of each divided part is performed and the assembly (partial assembly) of each of the front and rear body parts 3 and 5 is completed, the rear body part 5 is moved forward on the starting stand. The middle bent part 6 is inserted into the front body part 3 side. For the first time at this point, the front and rear body portions 3 and 5 are in a normal relative positional relationship (FIG. 10F).
In this way, when the shield machine 1 is a folding type, there is an operation of pushing the rear body part 5 toward the front body part 3 at the final stage of assembly of the shield machine 1, so that the front and rear body by this push work There should be no interference with the screw conveyor 49 even in the relative movement range of the parts 3 and 5. At this time, if the movable deck is slidable, there is a member extending to the fixed deck side, so there is a high possibility of interference with the screw conveyor, and the movable deck cannot be installed on the fixed deck in advance. .
On the other hand, in the present embodiment, the movable deck 19 does not extend to the fixed deck 17 side and does not interfere with the screw conveyor 49. Even in this case, the on-site assembly process (see step (v) shown in FIG. 11) can be simplified without separating the movable deck and the fixed deck.
(viii) After the on-site assembly of the shield machine 1 is completed, the necessary inspection and trial operation are performed (Fig. 11 (vi)).

As can be seen from the above description, particularly the description based on FIGS. 9 and 10, when the movable deck extends to the fixed deck 17 side, the movable deck interferes with the screw conveyor 49 (when the shield machine is completed). If it does, the construction process of the shield machine 1 will become complicated. Even if the movable deck does not interfere with the screw conveyor 49, in any step of the construction process of the shield machine 1 (as shown in FIG. 11), the installation timing of the movable deck is restricted. .
For example, in the case of (vii) above, the movable deck can be installed on the fixed deck unless the front and rear body parts 3 and 5 are in a proper relative positional relationship (that is, at the end of the field construction process). However, in order to perform such installation, the movable deck has to be removed from the fixed deck 17 in advance, which complicates the on-site assembly process. In order to avoid complication of the on-site assembly process, it is necessary to further devise such as unitizing the entire movable deck.
On the other hand, since the movable deck 19 of this embodiment does not extend to the fixed deck 17 side, it does not interfere with the screw conveyor 49 in any step of the construction process of the shield machine 1. . Therefore, the movable deck 19 may be installed at any time, and can be fixed (welded) to the fixed deck 17 before shipment from the factory.

  In short, according to the method for constructing a shield machine according to the present invention, even if the shield machine assembled in the factory is transported to the site as a single unit without being disassembled, it is disassembled into a plurality of blocks and After transporting, the shield machine can be assembled in the factory without separating the movable deck and the fixed deck, and in the latter case, the movable deck and the fixed deck are separated. Can be disassembled into a plurality of blocks, and the shield machine can be assembled without separating the movable deck and the fixed deck from the plurality of blocks at the site. (As a result, the construction period is shortened).

DESCRIPTION OF SYMBOLS 1 Shield machine 3 Front trunk | drum 3a Lower front trunk | drum 3b Upper front trunk | drum 5 Rear trunk | drum 5a Lower rear trunk | drum 5b Upper rear trunk | drum 6 Middle bent part 7 Cutter head 9 Shield jack 10 Segment 11 Elector apparatus 13 Gripping part DESCRIPTION OF SYMBOLS 15 Arm part 17 Fixed deck 19 Movable deck 20 Bracket 21 Deck part 23 Folding-type handrail 25 Drive mechanism part 27 Deck frame 29 Deck plate 31 Side handrail 33 Front handrail 35 Rectangular frame member 37 Reverse U-shaped part 39 1st drive frame Member 41 Second drive frame member 43 Main body 45 Rod 47 Drive jack 49 Screw conveyor

Claims (11)

  A shield machine equipped with a soil removal mechanism from the front trunk side toward the rear trunk side, having a fixed deck installed in the shield machine, and a movable deck installed in the fixed deck, The movable deck is an erector apparatus that transports the segment by rotating one end side of the deck portion serving as a work table to the fixed deck side so as to be rotatable and rotating in a plane that intersects the digging direction of the shield machine. Shield machine that is configured not to interfere with the machine.   2. The shield machine according to claim 1, wherein the movable deck includes a handrail that can be folded in a plane that intersects a direction of the shield machine. The erector device includes a transport device that swivels and transports the segment,
The movable deck can be arranged together with the handrail at a position that does not interfere with the turning range inside the turning range of the transporting device within a plane that intersects the excavation direction. The shield machine described in 1.   4. The shield machine according to claim 2, wherein the handrail includes a link mechanism that allows the handrail to be interlocked with a rotating operation of the movable deck. 5. A method for constructing a shield machine comprising a front trunk part, a rear trunk part, and a soil removal mechanism installed from the front trunk part side toward the rear trunk part side,
A step of preparing in advance a fixed deck having a movable deck that rotates in a plane intersecting the direction of digging of the shield machine on the side surface of the fixed deck; and the rear trunk is installed behind the front trunk. Or at least a part of the screw conveyor on the front torso side before the installation of the rear torso behind the front torso is completed, and the fixing to the back torso A method for constructing a shield machine, comprising: a step of installing a deck. A front trunk, a rear trunk, a soil removal mechanism installed from the front trunk toward the rear trunk, a fixed deck installed on the rear trunk, and a fixed deck installed on the fixed deck A method for constructing a shield machine comprising a movable deck,
A step of installing the movable deck on the side surface of the fixed deck so as to rotate in a plane intersecting a digging direction of the shield machine, a step of installing a front trunk, and a rear of the front trunk A step of installing a lower side of the rear torso, a step of connecting at least a part of the screw conveyor to the front torso, and a fixed deck having the movable deck installed on the lower side of the rear torso And a step of installing the upper side of the rear body portion. A method for constructing a shield machine.   The method for constructing a shield machine according to claim 6, further comprising a step of pushing the rear trunk portion into the front trunk portion side after the step of installing the upper side of the rear trunk portion. A front trunk, a rear trunk, a soil removal mechanism installed from the front trunk toward the rear trunk, a fixed deck installed on the rear trunk, and a fixed deck installed on the fixed deck A construction method for constructing a shield machine that includes a movable deck that rotates in a plane parallel to the cross section of the rear trunk portion on the side surface of the fixed deck,
A dismantling process for disassembling the shield machine into a plurality of blocks, a separation transporting process for conveying the plurality of blocks to the site, and the shield without separating the movable deck and the fixed deck from the plurality of blocks. And a local assembly process for assembling the excavator locally.   9. The construction of a shield machine according to claim 8, wherein the dismantling process is a process of disassembling the shield machine in a plurality of blocks without separating the movable deck and the fixed deck in a factory. Method.   The method for constructing a shield machine according to claim 9, wherein the shield machine is a shield machine assembled without separating the movable deck and the fixed deck in the factory. A front trunk, a rear trunk, a soil removal mechanism installed from the front trunk toward the rear trunk, a fixed deck installed on the rear trunk, and a fixed deck installed on the fixed deck A method of constructing a shield machine that includes a movable deck that rotates in a plane parallel to the cross section of the rear trunk portion on the side surface of the fixed deck,
In the factory, the process of assembling the shield machine without separating the movable deck and the fixed deck, and the process of transporting the shield machine that was assembled in the factory to the site without disassembling into a plurality of blocks, A method for constructing a shield machine, characterized by comprising:

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