JP2010229806A - Movable deck, and shield machine equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology related to a movable deck and a shield machine having the movable deck including a scaffolding hardly interfering with the turning range of an erector apparatus and becoming no hindrance to the assembly work of the shield machine. <P>SOLUTION: The movable deck 19 provided at the shield machine is constituted not to interfere with the erector apparatus for transporting segments by connecting one end side of a deck part 21 used as a workbench, turnably to the fixed deck 17 side and carrying out turning operation within a plane that intersects the advancing direction of the shield machine. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a movable deck provided in a shield machine and capable of being deformed so as not to interfere with an erector apparatus, and a shield machine provided with the movable deck.
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 for fine adjustment. 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.

As an example of such a movable deck, for example, Patent Document 1 describes a work deck of a shield machine, and this work deck includes a plurality of slide scaffold devices in the vertical direction. The scaffolding can be provided inside and outside the turning range of the elector device at a timing that does not hinder the turning operation of the elector device.
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 description, unless otherwise stated in relation to the prior art, the movable scaffold is a movable deck, and the fixed scaffold is a fixed deck.)

JP 2003-120198 A

  However, although the movable scaffold and the movable handrail are provided for the safety of the operator, they are devices that are relatively infrequently used. Therefore, it is not preferable to have a configuration that disturbs the operator's work when not in use. In particular, it is not preferable that the driving device for operating the movable scaffold or the movable handrail and the incidental equipment (including the hydraulic hose and the power supply cable) for supplying power to the driving device are bulky. Furthermore, it cannot be said that high functionality with increased cost is preferable. In other words, it is desirable that the device is as compact as possible and the cost can be kept low.

In the above-described prior art, in some of the plurality of slide scaffold devices, the sliding direction of the movable scaffold and the movable handrail is the digging direction, and the rest is the direction perpendicular to the digging direction.
When the movable scaffold slides in a direction perpendicular to the excavation direction, when retracted to the fixed scaffold side, the movable scaffold protrudes to the fixed scaffold side, that is, the center side of the shield machine. However, if it protrudes to the fixed scaffold side toward the shield machine, the work area of the worker who is active on the fixed scaffold may be reduced, the work may be disturbed, and the safety of the work environment may be reduced. In addition, for example, in the case of a mud type shield machine, a screw conveyor (soil discharge pipe) is provided at the center of the machine so as to rise obliquely upward from below, but at the center of the machine like the screw conveyor. In the case where devices, equipment, members, etc. are arranged, if there is a protruding movable scaffold, the assembly work of the shield machine cannot be performed smoothly. Even when a soil removal mechanism other than the screw conveyor is provided, the same problem as in the case of the screw conveyor is likely to occur due to the need to install it at a position that avoids interference with the erector device. Furthermore, if the shield machine has a small diameter, the movable scaffold may not be able to retract without interfering (collision) with devices, equipment, members, etc. in the center of the aircraft even if the movable scaffold is about to retract. . In such a case, it becomes difficult to install the slide scaffold device.
Thus, there are some problems with the movable scaffold being a slide type.

Further, there is a problem with handrails. That is, if the handrail is not deformed such that it is folded, for example, there is a high possibility of interference with the turning range of the erector.
Therefore, regardless of the diameter of the shield machine, it is desirable that the movable handrail be deformed so that it does not interfere with the swivel range or swivel space of the erector device, and therefore the movable scaffold (and hence the work deck). ) Is preferably provided with such a movable handrail.

  The present invention has been made in view of the above problems, is as compact as possible, is low in cost, hardly interferes with the swivel range of the movable deck and the erector apparatus, and hinders assembly work of the shield machine. It is an object of the present invention to provide a technique related to a movable deck provided with an unsupported scaffold and a shield machine having the movable deck.

  In order to achieve the above object, a movable deck according to the first embodiment of the present invention is a movable deck provided in a shield machine equipped with a fixed deck, and the movable deck is on one end side of a deck portion serving as a work table. Is connected to the fixed deck side so as to be rotatable, and is configured to be capable of rotating in a plane intersecting the deck surface of the fixed deck.

  The movable deck which concerns on the 2nd form of this invention is provided with the handrail which can be folded by rotating in the surface which cross | intersects the deck surface of the said fixed deck in the thing of the said 1st form. It is a feature.

  The movable deck according to the third aspect of the present invention is a movable deck provided in a shield machine, and the movable deck is rotatably connected to the fixed deck side at one end side of the deck portion serving as a work table, The shield excavator is configured so as not to interfere with the erector apparatus that transports the segment by rotating in a plane that intersects the digging direction of the shield machine.

  In addition, the movable deck according to the fourth aspect of the present invention can be folded by performing a moving operation or a rotating operation in a plane intersecting with the digging direction of the shield machine in the first embodiment. A handrail is provided.

  A movable deck according to a fifth aspect of the present invention is the movable deck according to the third or fourth aspect, wherein the erector device is provided with a transporting device that rotates and transports a segment, and the movable deck is a digging machine. In a plane intersecting with the direction, it can be arranged with the handrail at a position inside the turning range of the transporting device and not interfering with the turning range.

  Moreover, the movable deck which concerns on the 6th form of this invention is a thing of the said 4th or 5th form, The said handrail is provided with the link mechanism which enables the interlocking | linkage with the rotation operation | movement of the said movable deck. It is characterized by.

  A shield machine according to a seventh aspect of the present invention includes the movable deck according to any one of the first to sixth aspects.

  In addition, the shield machine according to the eighth aspect of the present invention includes an erector apparatus capable of a fine speed turning operation and a normal speed turning operation that is a turning operation at a higher speed than the fine speed turning operation, and an operator performs work. A shield excavator comprising a fixed deck to be performed and a movable deck that is installed on the fixed deck and is rotatable so as not to interfere with the erector device, wherein the movable deck is within a plane that intersects the excavation direction. A pivotable deck portion, and when the erector device is swiveling at the normal speed, the deck portion is pivoted to the fixed deck side, and the erector device is swung at the normal speed. When not, the deck portion can be extended from the fixed deck side toward the tunnel excavation wall surface side.

  Further, the shield machine according to the ninth aspect of the present invention is the one according to the eighth embodiment, wherein the shield machine is folded by performing a moving operation or a rotating operation in a plane intersecting the digging direction of the shield machine. A possible handrail is provided.

  Moreover, the shield machine according to the tenth aspect of the present invention is the one according to the seventh aspect, wherein the handrail includes a link mechanism that enables interlocking with the rotation operation of the movable deck. It is a feature.

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.

  In the first aspect of the present invention, the movable deck is configured such that one end side of the deck portion is pivotably connected to the fixed deck side, and the movable deck is configured to be rotatable in a plane intersecting the deck surface of the fixed deck. Therefore, it becomes a compact model that does not occupy a place or space. Further, it is not necessary to arrange the members constituting the movable deck inside the fixed deck, and therefore it is not necessary to secure a space for installing the members related to the movable deck on the fixed deck side. Hard to do. Furthermore, there is no need to consider interference with members installed on the fixed deck side. Therefore, according to the first embodiment, it is compact and does not incur a high cost, yet it is possible to secure an operator's work area and to ensure safety without interfering with work. A deck can be realized.

  In the second embodiment of the present invention, the movable deck includes the handrail because the handrail can be folded by moving or rotating in the plane intersecting the deck surface of the fixed deck. However, it becomes a compact model that does not occupy any place or space. Therefore, according to the second embodiment, it is possible to realize a movable deck that is compact and has higher safety.

  In the third embodiment of the present invention, the movable deck is pivotally connected to the fixed deck side at one end side of the deck portion, and rotates in a plane that intersects the digging direction of the shield machine. Since it is comprised so that it may not interfere with the erector apparatus which conveys a segment, it becomes a compact modeling which does not occupy a place or space. Further, it is not necessary to arrange the members constituting the movable deck inside the fixed deck, and therefore it is not necessary to secure a space for installing the members related to the movable deck on the fixed deck side. Hard to do. Furthermore, there is no need to consider interference with members or erector devices installed on the fixed deck side. Therefore, according to the third embodiment, it is possible to secure a work area (especially a work area between the tunnel wall surface and the fixed deck) for the worker who is active on the fixed deck while being compact and not incurring high costs. It is possible to ensure safety without interfering with work.

  For example, even if a screw conveyor is installed at the center of the shield machine such as a mud type shield machine, according to the third embodiment, the movable deck takes into account interference with the screw conveyor. There is no need, and the assembly work of the shield machine can be performed quickly. Further, it is possible to realize a movable deck that can be installed even when the shield machine has a large diameter as well as a small diameter.

  Moreover, since the movable deck which concerns on the 4th form of this invention is equipped with the handrail which can be folded by performing a movement operation | movement or a rotation operation in the surface which cross | intersects the digging direction of a shield machine, a movable deck When viewed as a whole, horizontal or vertical deformation between the wall of the tunnel and the fixed deck is possible, and the space required for deformation can be reduced, resulting in a more compact and less bulky movable deck. . The deployed handrail can further increase the safety of the operator.

  The movable deck which concerns on the 5th form of this invention can be arrange | positioned with a handrail in the position which does not interfere with the said turning range inside the turning range of the conveying apparatus with which an elector apparatus is provided in the surface which cross | intersects an excavation direction. Therefore, regardless of the diameter of the shield machine, it is possible to realize a desirable movable deck and thus a work deck.

In addition, according to the sixth aspect of the present invention, since the link mechanism that enables the interlocking with the rotating operation of the movable deck is provided, a separate drive source is not required for the folding operation of the handrail. Since such a handrail folding operation does not use a separate drive source or actuator, it can be equipped in a compact space similar to the conventional one without risk of failure.
Further, if the movable deck (or the deck portion) is configured to be interlocked with the rotating operation, the handrail can be installed in a usable state when the movable deck is required, and the operator can use the handrail. There is no burden of installing it separately, and a rational structure can be achieved.

  According to the 7th form of this invention, a shield machine provided with the movable deck which show | plays said effect is realizable. A more effective shield machine according to the fifth embodiment is a shield machine in which devices, equipment, members, etc. (including a soil removal mechanism) are arranged at the center of the machine body, for example, mud with a screw conveyor. This is a shield shield machine of the type and a small diameter shield machine.

  Other effects produced by the embodiments of the present invention and effects produced by the other embodiments of the present invention will be described in the embodiments or examples of the present invention.

It is explanatory drawing of the movable deck which concerns on one embodiment of this invention. It is operation | movement explanatory drawing of the movable deck which concerns on one embodiment of this invention. It is operation | movement explanatory drawing of the movable deck which concerns on one embodiment of this invention. It is operation | movement explanatory drawing of the movable deck which concerns on one embodiment of this invention. It is operation | movement explanatory drawing of the movable deck which concerns on one embodiment 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 a perspective view inside a shield machine according to an embodiment of the present invention. It is explanatory drawing of an erector apparatus. It is an internal side view which concerns on the other aspect of the shield machine which concerns on one embodiment of this invention. It is an internal side view which concerns on the other aspect of the shield machine which concerns on one embodiment of this invention. It is explanatory drawing of the assembly process of the shield machine which concerns on one embodiment of this invention. It is explanatory drawing of the assembly process of the shield machine which concerns on one embodiment of this invention.

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]
1 to 5 are explanatory diagrams of the movable deck according to the embodiment of the present invention, and FIG. 6 is an explanatory diagram for explaining the internal structure of the shield machine equipped with the movable deck of the present embodiment. FIG. 7 is a side view of the shield machine equipped with the movable deck of the present embodiment, and FIG. 8 is the inside of the shield machine (rear trunk) equipped with the movable deck of the present embodiment. It is a perspective view which shows a structure.
In the following, in order to explain where the movable deck is arranged in the shield machine, the internal structure of the shield machine will be explained based on FIGS. 6 to 8 prior to the explanation of the movable deck. Then, the movable deck will be described.

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. 9). 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. And the movable deck 19 is installed in the upper part of this fixed deck 17, and the both sides of the part near the front.
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. 8.

The movable deck 19 is configured to be rotatable in a plane orthogonal to the traveling direction of the shield machine 1. In FIG. 6, the movable deck 19 set on the left side from the rear to the front of the shield machine 1 is in a state of being usable in a horizontal state, and the right movable deck 19 has a tip side on the lower side. It is in a state where it cannot be used by rotating so as to face.
In FIG. 6, 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, based on FIG. 1, the structure of the movable deck 19 of this Embodiment is demonstrated. FIG. 1 shows a state in which the movable deck 19 protrudes outward and can be used. FIG. 1A is a perspective view and FIG. 1B is a side view. Note that FIGS. 2 to 4 are appropriately referred to when necessary for the 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.

2 to 5 are operation explanatory views for explaining the operation of the movable deck 19 configured as described above. FIG. 2 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. 3 and subsequent figures show how the deck portion 21 rotates from the state of FIG. 2, and the state of FIG. 4 is the same as in FIG. A state in which the foldable handrail 23 is assembled (installed state) is shown while being possible. FIG. 5 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. 2, the folding handrail 23 is in a folded state when the front end side of the deck portion 21 is obliquely downward. 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. 2, the entire movable handrail is disposed so as to stick to the side surface of the fixed deck 17, is located outside the turning range inside the turning range of the elector device 11, and interferes with the elector device 11. There is nothing.

When the rod 45 of the drive jack 47 is extended from the state shown in FIG. 2, the first drive frame member 39 rotates in the direction shown 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 the base end side is shown as 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. The side handrail 31 rotates in the direction indicated by the arrow E in FIG.
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. As shown in FIG. 4, 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. 4B, 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 be changed as shown 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. 4, 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 the present embodiment, since the rod portion 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. 4 to the fixed deck 17 side to return to the state shown in FIG. 2 will be described. The operation in this case is the reverse of the operations shown in FIGS. That is, when the rod 45 of the drive jack 47 is retracted from the state shown in FIG. 4, 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. 2 is obtained.
In the state of FIG. 2, the movable deck 19 is located inside the turning range of the erector device 11 and does not interfere with the erector device 11.

  FIG. 5 is a diagram in which (b) views of FIGS. 2 to 4 are arranged as (A) to (C) in order from the top. The deck portion 21 rotates and the folding 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 operation of the deck>
1. As described above, the side surface deck portion 21 is pivotally coupled to the bracket 20 so as to be pivotable, and this coupling portion serves as a pivot point in the direction indicated by the arrow C in FIG. Rotate.
In FIG. 5B, 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. 5B. The same applies to arrows D and E described later.

2. Side surface as translational movement When the pivoting movement of the deck portion 21 described in the above 1 is projected in the horizontal direction, the movement is generally in the horizontal direction in the range indicated by the arrow S in FIG. And the tunnel wall surface excavated thereby, or a moving operation in the horizontal direction in which the fixed deck 17 is separated or approached.
In short, the deck unit 21 performs an operation with a horizontal movement component in accordance with the rotation operation.

<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. 5 as the deck portion 21 is rotated as indicated by an arrow C in FIG. When this pivoting movement of the handrail 31 is projected in the horizontal direction, the horizontal direction in the range indicated by the arrow S in FIG. 5C (particularly the horizontal direction between the shield machine and the tunnel wall surface excavated thereby) Alternatively, the moving operation is performed in a horizontal direction away from or approaching the fixed deck 17. Since the front handrail 33 rotates as shown by an arrow D in the drawing along with the turning operation of the deck portion 81 as shown by an arrow C in FIG. This involves movement in the horizontal direction between the shield machine and the tunnel wall excavated thereby, or in the horizontal direction away from or approaching the fixed deck 17. Further, the front handrail 33 moves horizontally by a distance close to the horizontal distance indicated by the arrow S in FIG. 5C in accordance with the turning operation of the deck portion 21 as indicated by the arrow C in FIG. In short, both the handrails 31 and 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.

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

The movable deck 19 of the present embodiment has the following advantages.
(1) In the movable deck 19, when it rotates in the direction in which the deck portion 21 protrudes, the folding handrail 33 is assembled in conjunction with the operation, and the deck portion 21 faces the fixed deck 17 side. When rotating, the folding handrail 33 is moved or folded in conjunction with the rotating operation. Therefore, the movable deck 19 requires only a small space for deformation. Therefore, the movable deck 19 can be installed not only when the shield machine has a large diameter but also with 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, there is no risk of occurrence of a failure of the actuator or the like, and it can be installed in a compact space as in the prior art.

(3) The movable deck 19 rotates around the fixed deck 17 side as a fulcrum in a plane perpendicular to the traveling direction of the shield machine 1 or in a plane intersecting the deck surface of the fixed deck. Therefore, in a state where the tip is directed downward and close to the fixed deck 17 side, it can be surely put inside the turning range of the arm of the elector device 11, and therefore interference with the elector device 11 can be surely avoided. Can do.

(4) The movable deck 19 according to the present embodiment operates so that the base end side is a fulcrum of rotation and projects outward from the side surface side of the fixed deck 17. Therefore, it is not necessary to secure a space for installing a member related to the movable deck 19 on the fixed deck 17 side, and interference with a member installed on the fixed deck 17 side. There is no need to consider.

For example, when the shield machine 1 is a mud type, a screw conveyor is installed obliquely from the front trunk to the rear trunk of the shield machine 1, but in the movable deck 19 of the present embodiment, this There is no need to consider interference with the screw conveyor.
FIG. 10 is a plan view showing a state in which the movable deck 19 of the present embodiment is installed in the mud type shield machine 1 in which the screw conveyor 49 is installed, and FIG. It is a side view of the state which installed the movable deck 19 of the form.
As shown in FIGS. 10 and 11, since the screw conveyor 49 is disposed in the central portion of the shield machine 1, the movable handrail is a fixed deck in the case of the sliding movable handrail as shown in the conventional example. Although the problem of interference between the movable handrail and the screw conveyor 49 occurs when sliding to the 17 side, such a problem does not occur in the movable handrail of the present embodiment.

  Even in the assembly process of the shield machine 1 in which the screw conveyor 49 is installed, the movable handrail of the present embodiment does not adversely affect the assembly process of the shield machine 1.

(5) If it is the movable deck 19, the assembly process of the shield machine 1 will not be adversely affected even in the assembly process of the shield machine 1 in which the screw conveyor 49 is installed.
FIGS. 12 and 13 are explanatory views for explaining an assembly process of the shield machine 1 including the screw conveyor 49, and shows a state in which assembly proceeds in the order of (a) to (f) in the drawings.
Hereinafter, the assembly process of the shield machine 1 including the screw conveyor 49 will be outlined based on FIGS. 12 and 13.

(i) A front trunk 3 (lower front trunk 3a) (upper front trunk 3b), a cutter drive unit (not shown), and a cutter head, which are divided into upper and lower parts, on a starting stand (not shown) under a start-up stand. Provision of most of the equipment on the 7th front torso side. FIG. 12A shows a state where the temporary assembly has been completed.
(ii) The lower rear trunk part 5a which is the lower half of the rear trunk part 5 of the half split structure is inserted (FIG. 12B). In consideration of the welding operation in the subsequent process and the entry / exit of the worker, the rear body portion 5 is located slightly rearward from the front body portion 3, specifically, the folded portion installed in the rear body portion 5. 6 and the front trunk | drum 3, a clearance gap is formed, and temporarily arrange | positions so that the clearance gap may become a grade which enables a welding operation and an operator's going in and out.
(iii) The screw conveyor 49 is inserted from above the rear cylinder and connected to the front cylinder side and installed (FIG. 12C).
(iv) The fixed deck 17 on which the movable deck 19 is installed is inserted 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, and should be installed at this time. I can't.
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.

(v) Next, the upper rear trunk part 5b which is the upper half of the rear trunk part 5 is introduced and temporarily fixed to the lower rear trunk part 5a (FIG. 13 (e)).
(vi) After the step shown in FIG. 13 (e), the main parts of the divided parts (including the welding operation) are performed, and after the partial assembly of the front and rear body parts 3 and 5 is completed, the rear body is advanced on the starting stand. And insert the folded portion 6. For the first time at this point, the front and rear body portions 3 and 5 are in a proper relative positional relationship (FIG. 13F). If the movable deck 19 is slidable, the movable deck 19 can be installed at a position where it does not interfere with the screw conveyor 49 when the front and rear body portions 3 and 5 are in a proper relative positional relationship.

As can be seen from the description based on FIGS. 12 and 13, when the movable deck 19 extends to the fixed deck 17 side, even if the movable deck 19 does not interfere with the screw conveyor 49 in the completed state, the shield excavation is performed. The installation time is limited in relation to the assembly process of the machine 1, and it is necessary to install it at the end of the local assembly process (after the front and rear cylinders are in a normal relative positional relationship). Therefore, it is necessary to remove the movable deck 19 from the fixed deck 17 at the beginning. Further, in consideration of such an assembly process, the entire movable deck is unitized in order to simplify on-site assembly work. Such considerations are also necessary.
On the other hand, since the movable deck 19 of the present embodiment does not extend to the fixed deck 17 side, it does not interfere with the screw conveyor 49 in any process of the assembly process of the shield machine 1, It can be installed at any time, and can be fixed (welded) to the fixed deck 17 before shipment from the factory, simplifying the local assembly process (shortening the construction period).

(6) Processes after completion of assembly of each block of the shield machine 1 (front cylinder, rear (middle) cylinder, erector device, rear carriage, cutter drum, cutter disk, cutter motor, slewing bearing, shield jack, etc.) In general, (i) Temporary assembly in factory → (ii) Factory test and witness inspection → (iii) Dismantling → (iv) Split transportation → (v) On-site assembly → (vi) On-site inspection and trial operation (In more detail, although there are some differences in the names and names of each process, Geotechnical Engineering / Practical Series 3 “From Investigation / Design to Construction of the Shield Method” (Correction 2nd edition, issue: Geotechnical Society of Japan, Release: Maruzen Co., Ltd.) pp. 149-155).

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 slide type movable deck, the above-mentioned problems often occur.

  On the other hand, since the movable deck 19 of the present embodiment does not interfere with the screw conveyor 49, the above various problems do not occur. For this reason, for example, in the dismantling process of (iii), it is possible to carry in the field without dismantling the movable deck 19, so that the work process can be simplified (and the work period can be shortened).

  In the above description, the interference with the screw conveyor 49 during on-site assembly is a problem. However, depending on the installation position of the screw conveyor 49, the (appropriate) installation position of the movable deck 19 may be changed even after the assembly is completed. In some cases, the screw conveyor 49 interferes. (Such a case may occur depending on various conditions such as a small-diameter shield machine, an arrangement angle of the screw conveyor 49, a work deck shape, and a segment assembly position.)

In this case, the following countermeasures can be taken.
(i) The movable deck position is shifted forward, for example, to avoid interference with the screw conveyor 49.
However, if this is done, the movable deck 19 will be displaced from the position where the movable deck 19 is originally intended to be extended (ie, the position that is efficient for the segment assembling work), and it will also be close to the erector device 11, so the usability will deteriorate.
(ii) The sliding stroke of the slide type movable deck 19 is shortened and the movable deck 19 is also made small so as not to 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 19 will be insufficient, and the usability will deteriorate.
(iii) The movable deck installation position is moved upward, and the movable deck 19 is arranged at a position where it does not interfere with the screw conveyor 49.
However, since the upper space of the deck is compressed, the usability of not only the movable deck 19 but also the fixed deck 17 is deteriorated.

As described above, even in the case of the slide type movable deck 19, it is possible to avoid interference with the screw conveyor 49 by taking measures, but it can be said that any measure is sufficient. Absent.
In this respect, if the movable deck 19 according to the present embodiment is used, the movable deck 19 does not extend to the fixed deck 17 side, and it is not necessary to take the above-described measures. This is preferable because the function is not sacrificed.

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.

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 (10)

  A movable deck provided in a shield machine equipped with a fixed deck, wherein the movable deck is rotatably connected to one end side of a deck portion serving as a work table to the fixed deck side, and intersects the deck surface of the fixed deck. A movable deck that is configured to be capable of rotating in a plane.   The movable deck according to claim 1, further comprising a handrail that can be folded by moving or rotating in a plane that intersects the deck surface of the fixed deck.   A movable deck provided in a shield machine, wherein the movable deck is rotatably connected to one end side of a deck portion serving as a work table to a fixed deck side, and rotates in a plane intersecting with the shield machine's digging direction. A movable deck configured so as not to interfere with an erector apparatus that conveys a segment by moving.   4. The movable deck according to claim 3, further comprising a handrail that can be folded by moving or rotating in a plane that intersects the direction of the shield machine. The erector device includes a transport device that swivels and transports the segment,
The movable deck can be arranged 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 movable deck described in 1.   6. The movable deck according to claim 4 or 5, wherein the handrail includes a link mechanism that enables interlocking with a rotation operation of the movable deck.   A shield machine having the movable deck according to claim 1. An erector apparatus capable of a fine speed turning operation and a normal speed turning action that is a turning action at a speed faster than the fine speed turning action, a fixed deck on which an operator works, and the erector apparatus installed on the fixed deck, A shield machine equipped with a movable deck that can be deformed so as not to interfere,
The movable deck includes a rotatable deck portion in a plane intersecting the excavation direction,
When the erector device is rotating at the normal speed, the deck portion is pivoted to the fixed deck side. When the erector device is not rotating at the normal speed, the deck portion is A shield machine capable of projecting from the fixed deck side toward the tunnel excavation wall surface side.   9. The shield machine according to claim 8, further comprising a handrail that can be folded by moving or rotating in a plane that intersects with a direction of the shield machine.   The shield machine according to claim 9, wherein the handrail includes a link mechanism that enables the handrail to be interlocked with a rotating operation of the movable deck.

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