JP6838956B2 - How to assemble the segment - Google Patents

Description

The present invention relates to a segment assembling work method, and more particularly to a segment assembling work method for assembling a segment attached to an obliquely upper portion of an inner peripheral surface of a shield excavator.

The segments have an arcuate shape that is used to form a segment lining with a circular cross section by connecting and assembling in the circumferential direction in the work space inside the cylindrical skin plate that constitutes the outer part of the shield excavator. It is a member having a cross-sectional shape. The segment is transported to the assembly work position via a shield tunnel formed by the segment lining body, which is formed in advance of the shield excavator, and then delivered to a known elector device provided inside the skin plate. Is done. The delivered segments are further conveyed in the circumferential direction by the Electa device, and are assembled by connecting a plurality of segments so as to have a circular cross-sectional shape, and as a unit in front of the previously assembled segment lining body. By being connected, subsequent new segment lining bodies are sequentially formed as the shield excavator excavates.

Further, in the work of forming a segment lining body having a circular cross-sectional shape using segments, a plurality of segments are each conveyed to a predetermined position in the circumferential direction by an elector device, and along the inner peripheral surface of the skin plate. It includes the work of assembling and the work of manually fastening the assembled segments by workers. For example, in a medium-sized shield tunnel where the inner diameter of the tunnel by the segment lining is about 5 to 6 m. In some cases, it will be difficult to fasten the segments located at the top of the tunnel, so by installing a work deck inside the shield excavator and securing a foothold for work at a considerable height position, A technique for facilitating the fastening work has been developed (see, for example, Patent Document 1 and Patent Document 2).

If a work deck is provided inside the shield boring machine as a scaffolding for work when fastening the segments, the work deck is installed in the shield boring machine so that it can move as the shield boring machine advances, for example. A state in which the shield boring machine is supported in the axial direction from the front of the erecta device, passes through the segment assembly work position, and extends to the inside of the previously assembled segment lining body. Will be placed in. Further, at the segment assembly work position, the work deck is guided by the guide ring while the segment is gripped and swivels. By being placed in, it does not interfere with the Elekta device.

On the other hand, when the work deck, which serves as a scaffold for work when fastening the segments, is arranged in the area inside the swivel track region in the circumferential direction of the arm portion having the substantially gate shape of the Elekta device, the work deck becomes Since the segment is far from the segment assembled on the inner peripheral surface of the shield excavator, in the shield excavator of Patent Document 1 and Patent Document 2, the work fixed to the region inside the swirl track region of the arm portion of the erector device. A movable deck (movable scaffolding) that can be extended from the deck to the turning track area is provided, and a device is devised to facilitate the work of fastening the segment assembled diagonally above the inner peripheral surface of the shield excavator. It has been done.

Japanese Unexamined Patent Publication No. 2003-120198 Japanese Unexamined Patent Publication No. 2010-229806

In the shield excavator of Patent Document 1 and Patent Document 2, a movable deck is attached to the arm portion of the Elekta device while the arm portion of the Elekta device is turning to assemble a segment or when the arm portion is turning at a normal speed. The movable deck is controlled to be moved in and out so that the movable deck is housed in the area inside the turning track area of the arm part of the Elekta device in order to avoid contact with the movable deck. When assembling the segment to be attached to the diagonally upper part of the inner peripheral surface of the machine, the scaffolding is secured closer to the segment gripped by the arm part of the Elekta device, and the worker approaches the segment. By enabling the work, for example, it is possible to easily perform the work of fastening the segments while finely adjusting the arrangement position of the segments, and it is considered that the segments can be assembled more efficiently. ..

According to the present invention, when assembling a segment attached to an obliquely upper portion of the inner peripheral surface of a shield excavator, a scaffolding for a worker is secured at a position closer to the segment gripped by the arm portion of the elector device. An object of the present invention is to provide a segment assembly work method capable of assembling a segment more efficiently.

INDUSTRIAL APPLICABILITY The present invention is a shield excavator including an elector device for transporting and assembling segments in the circumferential direction and a work deck as a work scaffold for fastening the assembled segments, and a segment attached to an obliquely upper portion of an inner peripheral surface. It is a method of assembling a segment for assembling the segment, and the work deck is a fixed deck portion arranged in a state of passing through the assembling work position of the segment and extending in the axial direction of the shield excavator, and the segment. The fixed deck portion is configured to include a movable deck portion provided so as to extend outward from the fixed deck at the assembly work position of the above, and the fixed deck portion has a substantially gate-shaped shape of the erecta device at the assembly work position of the segment. The movable deck portion is arranged in a region inside the swivel track region in the circumferential direction of the arm portion including the above, and the movable deck portion is the swivel portion of the arm portion having a substantially gate shape at the assembly work position of the segment. The movable deck portion is provided so as to be able to project from the region inside the track region to the region where the arm portion is extruded radially outward toward the inner peripheral surface of the shield excavator. A horizontal slide portion that slides laterally along the floor portion of the fixed deck portion, a vertical support portion that extends downward from the outer end portion of the horizontal slide portion and is fixed, and the vertical support portion. It is formed to include a foldable scaffolding portion rotatably attached to the lower end of the directional support portion, and by sliding the lateral sliding portion outward and rotating the foldable scaffolding portion in the lateral direction. The scaffolding type of the erecta device that grips the segment when assembling the diagonally upper segment. The arm portion having a shape is pushed outward in the radial direction, and the movable deck portion is projected from the fixed deck portion to the swivel track region in the inner region of the arm portion having a substantially gate shape. The above object has been achieved by providing a segment assembly work method that enables the work of fastening the segments to be performed using the movable deck portion as a work scaffold.

Then, in the method of assembling the segment of the present invention, the movable deck portion has a lateral slide portion that slides laterally along the floor portion of the fixed deck portion and a lower portion from the outer end portion of the lateral slide portion. It is formed to include a vertical support portion that is extended and fixed to the vertical support portion and a foldable scaffolding portion that is rotatably attached to the lower end portion of the vertical support portion. It is preferable that the foldable scaffold portion is slid and expanded in the lateral direction by rotating the foldable scaffold portion so as to project into the swivel track region in the inner region of the arm portion having a substantially gate shape.

Further, in the method of assembling the segment of the present invention, the movable deck portion is in a state of projecting into the swivel track region in the inner region of the arm portion having a substantially gate shape, and the foldable scaffold portion is a shield excavator. It is preferable that it is deployed at the height position of the central portion in the vertical direction of.

Further, in the method of assembling the segment of the present invention, it is preferable that the segment is a segment forming a segment lining body having an inner diameter of 5 to 6 m.

According to the segment assembly work method of the present invention, when assembling the segment to be attached to the diagonally upper portion of the inner peripheral surface of the shield excavator, the position is closer to the segment gripped by the arm portion of the erector device. It is possible to secure a foothold for workers and assemble segments more efficiently.

It is a schematic vertical sectional view which illustrates the shield boring machine which adopts the segment assembly work method which concerns on one preferred embodiment of this invention. FIG. 5 is a schematic cross-sectional view taken along the line AA of FIG. 1 for explaining the configuration of a work deck and an elector device. It is a schematic cross-sectional view along BB of FIG. 1 explaining the structure of a work deck. (A) and (b) are schematic cross-sectional views illustrating an assembly work including a segment assembly work method according to a preferred embodiment of the present invention. (A) and (b) are schematic cross-sectional views illustrating an assembly work including a segment assembly work method according to a preferred embodiment of the present invention. (A) and (b) are schematic cross-sectional views illustrating an assembly work including a segment assembly work method according to a preferred embodiment of the present invention. (A) to (e) are enlarged schematic cross-sectional views of a working deck portion for explaining a situation in which a movable deck portion is developed. It is an enlarged schematic plan view of the part of the work deck in the state where the movable deck part is unfolded, looking at the right half part of FIG. 2 from above along CC of FIG.

As shown in FIG. 1, a segment assembling work method according to a preferred embodiment of the present invention is a rear body portion 22 in, for example, a break-action type shield excavator 20 including a front body portion 21 and a rear body portion 22. In the work space inside the cylindrical rear skin plate 22a constituting the outer shell portion of the above, a plurality of segments 23a are assembled by being connected in the circumferential direction, and a segment cover having a circular cross section having an inner diameter of preferably about 5 to 6 m is provided. It is used when forming the work body 23. As shown in FIG. 2, the segment assembly work method of the present embodiment includes a known erector device 24 having a function of transporting the segment 23a in the circumferential direction and assembling the segment 23a along the inner peripheral surface of the rear skin plate 22a. In particular, the segment 23a (see FIGS. 5A and 5B) attached to the diagonally upper portion of the inner peripheral surface of the shield excavator 20 is adopted as a method for assembling while avoiding the interference of the above. According to the segment assembly work method of the present embodiment, when assembling the segment 23a attached to the diagonally upper portion of the inner peripheral surface of the shield excavator 20, the segment 23a gripped by the arm portion 25 of the elector device 24 Therefore, by securing the scaffolding of the worker at a closer position, it becomes possible to perform the assembly work of the segment 23a more efficiently.

Then, as shown in FIGS. 1 to 3, the segment assembly work method of the present embodiment is a work scaffolding for fastening the assembled segment 23a with the elector device 24 for transporting and assembling the segment 23a in the circumferential direction. This is a work method for assembling a segment 23a attached to an obliquely upper portion of an inner peripheral surface in a shield excavator 20 including a work deck 10 to be used, and the work deck 10 passes through a segment assembly work position 50. Includes a fixed deck portion 11 arranged so as to extend in the axial direction of the shield excavator 20, and a movable deck portion 12 provided so as to extend outward from the fixed deck portion 11 at the segment assembly work position 50. It is composed of. The fixed deck portion 11 is arranged at the segment assembly work position 50 in the region 52 inside the swirling track region 51 in the circumferential direction of the arm portion 25 having a substantially gate-shaped shape of the elector device 24. In the segment assembly work position 50, the movable deck portion 12 is located in the rear skin plate 22a of the shield excavator 20 from the region 52 inside the swivel track region 51 of the substantially gate-shaped arm portion 25. It is provided so as to be overhanging in the region to which the extrusion length L (see FIG. 5A), which is extruded outward in the radial direction toward the peripheral surface, is added. When assembling the diagonally upper segment 23a, the substantially gate-shaped arm portion 25 of the elector device 24 that grips the segment 23a is pushed outward in the radial direction, and the movable deck portion 12 is substantially gated from the fixed deck portion 11. The segment 23a can be fastened by projecting to the swivel track region 51 in the inner region of the mold-shaped arm portion 25 and using the projecting movable deck portion 12 as a work scaffold (FIG. 4 (FIG. 4). c) (see (e)).

The shield excavator 20 to which the segment assembly work method of the present embodiment is carried out is, for example, a break-action type shield excavator, and is provided with an elector device 24 and a work deck 10 in an internal work space. There is. The break-action type shield excavator 20 has a known configuration having a front body portion 21 and a rear body portion 22, and the front body portion 21 and the rear body portion 22 are interposed between them to rotate. The front body 21 is bent with respect to the rear body 22 by extending a predetermined jack selected from a plurality of break-action jacks 26 (see FIG. 1) provided at intervals in the direction. The shield excavator 20 can be excavated in a predetermined direction in a curved shape.

In the present embodiment, the shield excavator 20 is, for example, a muddy water type shield excavator, and the front body portion 21 includes a cylindrical front skin plate 21a constituting the outer shell portion thereof. A rotary cutter 27 is provided at the tip of the front skin plate 21a. Behind the rotary cutter 27, a muddy water chamber 29 is formed by being partitioned by a partition wall 28. While stabilizing the face surface by the pressure of the muddy water filled in the muddy water chamber 29, the shield excavator 20 obtains the excavation reaction force from the assembled segment lining body 23 while cutting the face surface with the rotary cutter 27. , You can dig forward. In addition to the drive device 30 of the rotary cutter 27, a mud drain pipe 31 that communicates with the muddy water chamber 29 and discharges muddy water containing earth and sand that has been cut, and muddy water are placed in the work space inside the front skin plate 21a. A muddy water pipe 32 and the like for pumping to the muddy water chamber 29 are provided. A cylindrical rear skin plate 22a of the rear body portion 22 is flexibly connected to the rear of the front skin plate 21a via a known bending sliding mechanism 33.

An annular support ring portion 36a and a strut portion 36b are integrally attached to the tip portion of the rear skin plate 22a on the rear body portion 22. A plurality of shield jacks 37 are attached to the annular support ring portion 36a in a state in which the cylinder portion 37a is extended toward the front body portion 21 at a predetermined interval in the circumferential direction. The shield jack 37 extends the piston portion 37b rearward to bring the rear end pressing portion 37c into contact with the tip surface of the assembled segment lining body 23, and further extends the piston portion 37b to cover the segment. The shield excavator 20 can be excavated by obtaining the excavation reaction force from the work body 23 and pushing the shield excavator 20 forward as the face surface is cut by the rotary cutter 27.

Further, in the annular support ring portion 36a, a plurality of rear end portions of the center-folded jack 26 provided between the annular support ring portion 36a and the front body portion 21 are rotatably pin-coupled. The front end portion of the center-folded jack 26 is rotatably pin-coupled to a support bracket 26a provided so as to project inward from the front skin plate 21a of the front body portion 21. As a result, as described above, the front body portion 21 is bent with respect to the rear body portion 22 by extending a predetermined jack selected from a plurality of center-folded jacks 26 provided at intervals in the circumferential direction. The shield excavator 20 can be excavated in a predetermined direction in a curved shape.

Further, in the present embodiment, the annular support ring portion 36a is supported, and behind the annular support ring portion 36a, the elector ring portion 38 of the elector device 24 described later is arranged concentrically with the rear skin plate 22a and provided in an annular shape. The arm portion 25 of the erector device 24 can rotate and move in the circumferential direction along the erector ring portion 38, guided by the erector ring portion 38.

Furthermore, in the present embodiment, the upper and lower ends are fixed to the annular support ring portion 36a, and the support columns 36b are preferably provided as a pair extending in the vertical direction. The tip portion is supported by these strut portions 36b, and the work deck 10 described later is attached in a state of projecting rearward in the shape of a cantilever. The work deck 10 is arranged in the central portion of the rear skin plate 22a and extends in the axial direction of the shield excavator 20 to reach the inside of the previously assembled segment lining 23. It is provided.

As shown in FIG. 2, the Elekta device 24 is a known device known as a device for assembling the segment 23a, which has substantially the same configuration as the Elekta device described in, for example, Japanese Patent Application Laid-Open No. 10-61396. As described above, the erector device 24 includes an erector ring portion 38 (not shown) and an arm portion 25 that rotationally moves along the erector ring portion 38 in the circumferential direction. The arm portion 25 is arranged at a position facing the radial direction of the electoring portion 38 arranged concentrically with the rear skin plate 22a, and is provided with a pair of support arm portions 25a extending in parallel with each other. , It has a substantially gate-shaped front shape including a connecting arm portion 25b provided so as to connect one end portions of these supporting arm portions 25a to each other. The connecting arm portion 25b has a shape that is bent so as to be convex outward.

Each of the pair of support arm portions 25a of the arm portion 25 is provided with a known advancing / retreating mechanism 39 including a telescopic jack 39a and the like. By advancing and retreating the support arm portion 25a by these advancing / retreating mechanisms 39, the connecting arm portion 25b of the arm portion 25 can be pushed out radially outward toward the inner peripheral surface of the rear skin plate 22a of the shield excavator 20. The extruded connecting arm portion 25b can be retracted inward in the radial direction (see FIGS. 4 to 6). A segment grip portion 25c is provided at the central portion of the connecting arm portion 25b.

The segment gripping portion 25c includes a known gripping device 25d capable of gripping the segment 23a having an arcuate cross-sectional shape from the inner peripheral surface side thereof. The segment gripping portion 25c receives the segment 23a, which has been conveyed to the assembly work position 50 through the inside of the shield tunnel formed by the segment lining body 23 formed in advance, by gripping the segment 23a with the gripping device 25d. As the arm portion 25 rotates along the electoring portion 38 in the circumferential direction, it can be conveyed to a predetermined position in the circumferential direction.

Further, the segment gripping portion 25c uses the function of the matching telescopic jack 25e (see FIG. 1) provided between the arm portion 25 and the connecting arm portion 25b to hold the gripping device 25d on the shield excavator 20. It can be moved forward and backward in the axial direction. As a result, the position of the gripped segment 23a in the axial direction of the shield excavator 20 can be appropriately adjusted.

In the present embodiment, the work deck 10 which is supported by the support column 36b (see FIG. 1) and is arranged in the central portion of the rear skin plate 22a passes through the segment assembly work position 50 as described above. Includes a fixed deck portion 11 arranged so as to extend in the axial direction of the shield excavator 20, and a movable deck portion 12 provided so as to extend outward from the fixed deck portion 11 at the segment assembly work position 50. It is composed of.

The fixed deck portion 11 is formed by assembling various known steel materials such as I-shaped steel, H-shaped steel, angle steel, and channel steel. In the fixed deck portion 11, the front end portion of the shield excavator 20 in the excavation direction is firmly and integrally fixed to the rear surface of the support column portion 36b via bolt joints or welded joints. As a result, the fixed deck portion 11 is arranged in the central portion of the rear skin plate 22a, passes from the front of the elector device 24, passes through the segment assembly work position 50, and is assembled in advance of the segment lining body 23. It will be installed in a state of extending in the axial direction of the shield excavator 20 to the inside of the shield excavator 20.

Further, a scaffolding plate made of, for example, punching metal is laid on the upper surface of the fixed deck portion 11, so that the floor portion 11a is formed (see FIG. 8). Further, an elevating step 11b (see FIGS. 1 and 8) is attached to the rear end portion of the fixed deck portion 11. As a result, the worker can go up to the floor portion 11a on the upper surface of the fixed deck portion 11 to walk or work.

Further, the segment lining body 23 immediately after being assembled is pressed against the fixed deck portion 11 from the inside so that the segment lining body 23 immediately after being assembled does not deform until the surrounding ground is stabilized. A shape-retaining device 40 is provided to support it (see FIG. 1). As shown in FIG. 3, the shape-retaining device 40 is movable in the axial direction of the shield excavator 20 along the guide rail portions 41 provided on both side edges of the fixed deck portion 11 in the width direction. Moreover, it is provided in a state where it can be separated from the guide rail portion 41.

That is, the shape holding device 40 is connected to the upper contact portion 40a including an arc-shaped portion having a shape along the upper inner peripheral surface of the segment lining body 23, which is connected via a pair of left and right vertical telescopic jack portions 42. A lower contact portion 40b including an arc-shaped portion having a shape along the lower inner peripheral surface of the segment lining body 23 is provided. The shape-retaining device 40 extends the vertically telescopic jack portion 42 to separate the upper contact portion 40a from the guide rail portion 41 of the fixed deck portion 11, and separates the upper contact portion 40a and the lower contact portion 40b. , The segment lining body 23 can be pressed against the upper inner peripheral surface or the lower inner peripheral surface to support the segment lining body 23 so that the shape of the segment lining body 23 is maintained (see the left side portion of FIG. 3). ). Further, the shape-retaining device 40 contracts the vertical expansion / contraction jack portion 42 from the extended state to bring the upper contact portion 40a and the lower contact portion 40b into the upper inner peripheral surface and the lower portion of the segment lining body 23. The traveling wheels 44 attached to the wheel support brackets 43, which are separated from the peripheral surface and project inward from the inner peripheral surfaces of the side portions on both sides of the upper contact portion 40a, are placed on the guide rail portion 41. You can do it. As a result, the shape-retaining device 40 can be moved along the guide rail portion 41 in the axial direction of the shield excavator 20 while being supported by the fixed deck portion 11. In this embodiment, two shape holding devices 40 are provided.

In the present embodiment, the fixed deck portion 11 has a substantially gate-shaped arm portion 25 in the circumferential direction so as not to interfere with the arm portion 25 of the elector device 24 at the segment assembly work position 50. It is arranged in the region 52 inside the 51 (see FIG. 2). Further, in a portion separated from the segment assembly work position 50, for example, a rear portion thereof, the fixed deck portion 11 includes, for example, guide rail portions 41 (see FIG. 3) provided on both side edges in the width direction and an elevating step. 11b (see FIGS. 1 and 8) is provided so as to protrude from the region 52 inside the swivel track region 51 of the arm portion 25 into the swivel track region 51.

Then, in the present embodiment, the movable deck portion 12 is provided so as to extend outward from the fixed deck portion 11 at the segment assembly work position 50. In the present embodiment, the movable deck portion 12 preferably slides laterally along the floor portion 11a of the fixed deck portion 11 as shown in FIGS. 1, 2, 7, and 8. 12a, a vertical support portion 12b extending downward and fixed from the outer end portion of the lateral slide portion 12a, and a foldable scaffolding portion 12c rotatably attached to the lower end portion of the vertical support portion 12b. The lateral slide portion 12a is slid outward, and the foldable scaffold portion 12c is rotated to expand it laterally, so that the lateral slide portion 12a is swiveled in the inner region of the substantially gate-shaped arm portion 25. It can be extended to the orbital region 51 (see FIGS. 6A and 6B).

In the lateral sliding portion 12a of the movable deck portion 12, steel materials such as angle steel and channel steel are assembled in a frame shape so as to have a rectangular planar shape, and a scaffolding plate made of, for example, punching metal is attached to the upper surface. It is formed (see FIG. 8). The lateral slide portion 12a is an overhang jack that is provided on the maintenance hatch 11c (see FIG. 8) installed on the floor portion 11a of the fixed deck portion 11 and can be expanded and contracted in the direction perpendicular to the axial direction of the shield excavator 20. Due to the function of 12d, it is possible to slide along the floor portion 11a of the fixed deck portion 11 in the lateral direction perpendicular to the axial direction of the shield excavator 20. As shown in FIGS. 7A to 7E, the tip portion of the lateral slide portion 12a extends vertically downward from the lateral slide portion 12a, and the vertical support portion 12b slides in the lateral direction. It is attached to the portion 12a in a state of being integrally fixed.

Similar to the lateral slide portion 12a, the vertical support portion 12b is formed by assembling steel materials such as angle steel and channel steel in a frame shape to have a rectangular front shape (see FIG. 1). At the lower end of the vertical support portion 12b, a rotary connecting rib plate 12e is provided so as to project outward. A foldable scaffold portion 12c is rotatably pin-coupled and attached via a rotary connecting rib plate 12e.

Similar to the lateral slide portion 12a, the foldable scaffold portion 12c is formed by assembling steel materials such as angle steel and channel steel into a frame shape so as to have a rectangular planar shape when unfolded, and on the upper surface thereof, for example, punching metal or the like. It is formed by attaching a scaffolding plate made of (see FIG. 8). The base end of the foldable scaffolding portion 12c on the fixed deck portion 11 side is rotatably pin-coupled to the rotary connecting rib plate 12e at the lower end of the vertical support portion 12b, and the axle plate 12f is foldable. It projects in the direction perpendicular to the scaffolding portion 12c and is fixed as a unit. Rotating wheels 12g are rotatably supported on the axle plate 12f.

The rotating wheel 12g slides on the guide rail 11f as the lateral sliding portion 12a of the movable deck portion 12 slides in the lateral direction perpendicular to the axial direction of the shield excavator 20 due to the expansion and contraction of the overhanging jack 12d. , It is possible to move while rotating. The guide rail 11f is provided on the lower flange portion 11e of the edge portion I-shaped steel 11d forming the side edge portion of the fixed deck portion 11 so as to extend in a direction perpendicular to the axial direction of the shield excavator 20. Further, at the tip end portion of the guide rail 11f, a slope portion 11g that inclines diagonally downward toward the outside is formed. As the rotating wheel 12g moves on the slope portion 11g while rotating, the foldable scaffolding portion 12c rotates around the pin connecting portion formed by the rotary connecting rib plate 12e (see FIG. 7C). , Can be unfolded in the horizontal direction (see FIGS. 7 (d) and 7 (e)), and can be folded from the unfolded state (see FIGS. 7 (a) and 7 (b)).

In the present embodiment, when the movable deck portion 12 is slid and moved in the lateral direction and the foldable scaffolding portion 12c is deployed, the lateral sliding portion 12a and the foldable scaffolding portion 12c of the movable deck portion 12 are of segments. At the assembly work position 50, the arm portion 25 is radially outward from the region 52 inside the swivel track region 51 of the substantially gate-shaped arm portion 25 toward the inner peripheral surface of the rear skin plate 22a of the shield excavator 20. It is possible to overhang the area to which the extruded length L (see FIG. 5A) is added.

Further, in the present embodiment, the foldable scaffolding portion 12c is centered in the vertical direction of the shield excavator 20 in a state where the movable deck portion 12 projects over the turning track region 51 in the inner region of the substantially gate-shaped arm portion 25. It is designed to be deployed at the height position of the part. As a result, it becomes possible to more easily perform the installation work of the segment 23a from the side portion of the inner peripheral surface of the shield excavator to the diagonally upper portion, which has been difficult in the past due to lack of scaffolding.

Then, in the present embodiment, at the segment assembly work position 50 in the shield excavator 20 having the above configuration, as shown in FIGS. 4 (a), (b) to 6 (a), (b), as shown below. The segment 23a can be assembled in the circumferential direction to form the segment lining body 23.

That is, in the present embodiment, the segment 23a that has been conveyed to the assembly work position 50 through the inside of the shield tunnel formed by the segment lining body 23 formed in advance is gripped by the gripping device 25d of the segment gripping portion 25c. By receiving the product and transporting it to a predetermined position in the circumferential direction, the gripped segments 23a are sequentially assembled from the lower part to the upper part inside the rear skin plate 22a. In addition, the assembled segments 23a adjacent to each other in the circumferential direction are joined together by being manually fastened by an operator.

Here, as shown in FIGS. 4A and 4B, the segments 23a assembled to the lower portion and the side portion of the inner peripheral surface of the rear skin plate 22a of the shield excavator 20 are assembled. By using the 23a as a scaffold, it is possible to secure a scaffold for the worker at a position close to the segment 23a and easily perform the work of fastening the segment 23a while finely adjusting the arrangement position of the segment 23a, for example. Become.

Further, according to the present embodiment, in the movable deck portion 12, the arm portion 25 digs a shield from the region 52 inside the swivel track region 51 of the substantially gate-shaped arm portion 25 at the segment assembly work position 50. Since it is provided so as to be overhanging in the region to which the extrusion length L, which is extruded outward in the radial direction toward the inner peripheral surface of the rear skin plate 22a of the machine 20, is added, FIGS. As shown in FIG. 6A, with respect to the segment 23a assembled to the diagonally upper portion of the inner peripheral surface of the rear skin plate 22a of the shield excavator 20, the substantially gate shape of the erector device 24 gripping the segment 23a. The arm portion 25 of the above was pushed outward in the radial direction, and the movable deck portion 12 was projected from the fixed deck portion 11 to the swirling track region 51 in the inner region of the substantially gate-shaped arm portion 25. By using the movable deck portion 12 as a work scaffold, it is possible to secure a scaffold for the worker at a position closer to the segment 23a. This makes it possible to easily perform the work of fastening the segment 23a attached to the diagonally upper portion while finely adjusting the arrangement position of the segment 23a, for example.

Further, according to the present embodiment, at the segment assembly work position 50, the fixed deck portion 11 of the work deck 10 is considerably higher in the region 52 inside the turning track region 51 in the central portion of the rear skin plate 22a. Since it is provided at the vertical position, as shown in FIG. 6B, the fixed deck portion 11 is provided with respect to the segment 23a assembled to the upper part of the inner peripheral surface of the rear skin plate 22a of the shield excavator 20. By using the work scaffolding, it becomes possible to secure a scaffolding for workers at a position close to the segment 23a and easily perform the work of fastening the segment 23a while finely adjusting the arrangement position of the segment 23a, for example. ..

Therefore, according to the segment assembly work method of the present embodiment, it is gripped by the arm portion 25 of the erector device 24, particularly when assembling the segment 23a attached to the diagonally upper portion of the inner peripheral surface of the shield excavator 20. It is possible to secure a foothold for the worker at a position closer to the segment 23a and assemble the segment 23a more efficiently.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, the movable deck portion is a foldable scaffold rotatably attached to a lateral slide portion that slides laterally along the floor portion of the fixed deck portion, a vertical support portion, and a lower end portion of the vertical support portion. It is not always necessary that the arm portion is formed including the portion, and the arm portion is extruded radially outward from the region inside the swirling trajectory region of the substantially gate-shaped arm portion at the segment assembly work position. It may be various other movable deck portions having a structure capable of extending to the added region.

10 Work deck 11 Fixed deck 11a Floor 11b Lifting step 11c Maintenance hatch 11d Edge I-shaped steel 11e Lower flange 11f Guide rail 11g Slope 12 Movable deck 12a Horizontal slide 12b Vertical support 12c Foldable Scaffolding 12d Overhanging jack 12e Rotating connecting rib plate 12f Axle plate 12g Rotating wheel 20 Shield excavator 21 Front body 21a Front skin plate 22 Rear body 22a Rear skin plate 23 Segment lining 23a Segment 24 Electa device 25 Arm Part 25a Support arm part 25b Connecting arm part 25c Segment grip part 25d Gripping device 25e Telescopic jack 36a Circular support ring part 36b Strut part 38 Electuring part 39 Advance / retreat mechanism 39a Telescopic jack 50 Segment assembly work position 51 Swing track area 52 Swing track Area L inside the area L Extrusion length

Claims (3)

For assembling a segment to be attached to the diagonally upper part of the inner peripheral surface in a shield excavator equipped with an elector device for transporting and assembling the segment in the circumferential direction and a work deck as a work scaffold for fastening the assembled segment. It ’s a segment assembly work method.
The work deck has a fixed deck portion that passes through the assembly work position of the segment and is arranged so as to extend in the axial direction of the shield excavator, and can project outward from the fixed deck at the assembly work position of the segment. It is configured to include the movable deck part provided in
The fixed deck portion is arranged in a region inside the swirling track region in the circumferential direction of the arm portion having a substantially gate-shaped shape of the elector device at the assembly work position of the segment, and the movable deck portion. At the assembly work position of the segment, the arm portion is extruded radially outward from a region inside the swivel track region of the arm portion having a substantially gate shape toward the inner peripheral surface of the shield excavator. It is provided so that it can be extended in the area where the extrusion length is added.
The movable deck portion includes a lateral slide portion that slides laterally along the floor portion of the fixed deck portion and a vertical support portion that extends downward from the outer end portion of the lateral slide portion and is fixed. And a foldable scaffolding portion rotatably attached to the lower end of the vertical support portion, the lateral sliding portion is slid outward, and the foldable scaffolding portion is rotated. As a result, it is expanded in the lateral direction so as to project into the swivel track region in the inner region of the arm portion having a substantially gate shape.
When assembling the diagonally upper segment, the arm portion having a substantially gate shape of the elector device holding the segment is pushed outward in the radial direction, and the movable deck portion is pushed from the fixed deck portion to have a substantially gate shape. A method of assembling a segment so that the movable deck portion overhanging the swivel track region in the inner region of the arm portion can be used as a work scaffold to fasten the segments. The foldable scaffolding portion is deployed at a height position of a central portion in the vertical direction of the shield excavator in a state where the movable deck portion projects into the turning track region in the inner region of the arm portion having a substantially gate shape. The method for assembling the segment according to claim 1. The method for assembling a segment according to claim 1 or 2 , wherein the segment is a segment forming a segment lining body having an inner diameter of 5 to 6 m.

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