JP2021195840A - Carrier device for widening - Google Patents

Abstract

To provide a carrier device for widening that can efficiently conduct carry-in work and carry-out work of a carrying object for building an outer shell tunnel.SOLUTION: A carrier device 100 for widening that is used for widening a main line tunnel T1 by building multiple outer shell tunnels T2 from an annular outer peripheral region A2 provided at an outer peripheral side of the main line tunnel T1 comprises: a carrier path 2 connecting an inner peripheral area A1 of an inner peripheral side of the main line tunnel T1 and an outer peripheral region A2 of an outer peripheral side thereof; a turning mechanism 3 for turning the carrier path 2 around the vicinity of a center axis α of the main line tunnel T1; and a carrier device 4 provided at the carrier path 2 and carrying a carrying object C including an excavator C1 and the material and equipment, for building the outer shell tunnels T2, by moving along the carrier path 2.SELECTED DRAWING: Figure 3

Description

The present invention relates to a widening transport device, and more particularly to a widening transport device that transports excavators and materials and equipment in order to construct a plurality of outer shell tunnels on the outer periphery of a main tunnel.

Conventionally, a widening transport device for transporting excavators and materials and equipment for constructing a plurality of outer shell tunnels on the outer periphery of a main tunnel has been known (see, for example, Patent Document 1).

Here, the outer shell tunnel is a tunnel formed side by side on the outer periphery of the main line tunnel for the protection of the main line tunnel. The outer shell tunnel is configured as a protective wall around the main tunnel by being filled with concrete or the like after the tunnel is formed.

The above-mentioned Patent Document 1 includes a horizontal work stage provided in the main tunnel, and a plurality of transport units arranged in a circle in a row in the circumferential direction of the main tunnel on the outer peripheral side of the main tunnel. The transport device is disclosed. The main tunnel is provided with an opening at a predetermined position for carrying a transport object such as a shield machine into the transport unit from the work stage. The opening communicates the inner peripheral region of the main tunnel and the outer peripheral region where the outer shell tunnel is constructed. The outer peripheral region is an annular region surrounding the inner peripheral region, and functions as a starting base for a shield machine that constructs an outer shell tunnel.

The transport device simultaneously swivels a plurality of transport units along the annular outer peripheral region of the main tunnel like a Ferris wheel surrounding the main tunnel, thereby making the transport unit to which the transport target is carried into the outer shell. It is configured to move to a predetermined position to build a tunnel.

Japanese Unexamined Patent Publication No. 2016-84681

However, in the so-called Ferris wheel type transport device described in Patent Document 1, when the transport target is carried from the work stage to the transport unit through the opening, the transport target will be carried in from now on at a position facing the opening. It is necessary to make the predetermined transport unit that is supposed to be on standby (stop). As a result, it is necessary to stop other transport units as well, and when the transport target is carried in through the opening, it becomes impossible to turn a plurality of transport units in parallel with the carry-in work, so that the carry-in work can be performed efficiently. There is a problem that it cannot be done. A similar problem arises in the carrying-out work.

The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to efficiently carry out the carry-in work and the carry-out work for constructing an outer shell tunnel. It is to provide a transport device for widening that is possible.

In order to achieve the above object, the widening transfer device according to the present invention is used when constructing a plurality of outer shell tunnels from an annular outer peripheral region provided on the outer peripheral side of the main tunnel and widening the main tunnel. A transport device for widening, a transport path connecting the inner peripheral region on the inner peripheral side of the main tunnel and the outer peripheral region on the outer peripheral side, a swivel mechanism for swiveling the transport path around the central axis of the main tunnel, and a transport path. It is equipped with an excavator that moves along a transport path to construct an outer shell tunnel and a transport device that transports a transport object including materials and equipment. In addition, "near" in the above-mentioned "turning the transport path around the central axis of the main tunnel" means the position of the central axis of the main tunnel itself and a predetermined center in the vicinity of the central axis of the main tunnel. Includes both the position of the axis and. That is, the above-mentioned swivel mechanism includes both a configuration in which the transport path is swiveled around the central axis of the main tunnel and a configuration in which the transport path is swiveled around a predetermined central axis in the vicinity of the central axis of the main tunnel. In this case, the "predetermined central axis" is located at a position different from the central axis of the main tunnel and is substantially parallel to the central axis of the main tunnel.

In the widening transport device according to the present invention, as described above, the transport path connecting the inner peripheral region on the inner peripheral side and the outer peripheral region on the outer peripheral side of the main tunnel and the transport path are swiveled around the central axis of the main tunnel. A swivel mechanism and a transport device installed in the transport path and moving along the transport path to transport an excavator for constructing an outer shell tunnel and a transport device including materials and equipment are provided. As a result, the transport device is installed, and the transport path connecting the inner peripheral region and the outer peripheral region can be swiveled around the central axis of the main tunnel by the swivel mechanism. Therefore, the transport path can be swiveled by the swivel mechanism in a state where the inner peripheral region and the outer peripheral region are connected by the transport path. That is, the transport path can be swiveled by the swivel mechanism while carrying the transport target into the transport device of the transport path in the inner peripheral region or carrying out the transport target from the transport device of the transport path. As a result, when the carry-in work and the carry-out work are performed, the transport path can be turned in parallel, so that the carry-in work and the carry-out work for constructing the outer shell tunnel can be efficiently performed. can.

In the widening transport device, the transport path preferably extends linearly in the radial direction of the main tunnel so as to connect the inner peripheral region and the outer peripheral region. With this configuration, the transport path extends linearly in the radial direction of the main tunnel, so the transport target can be carried in and out via the transport path that connects the inner peripheral region and the outer peripheral region by the shortest distance. Can be done. Therefore, it is possible to more efficiently carry out the carry-in work and the carry-out work for constructing the outer shell tunnel.

In this case, preferably, the transport path extends so as to connect the vicinity of the central axis of the main tunnel in the inner peripheral region with the outer peripheral region. With this configuration, the vicinity of the central axis and the outer peripheral region of the inner peripheral region can be connected by the transport path, so that the transport path (transport device) can be arranged near the center of rotation by the swivel mechanism. can. Therefore, when the transport path is swiveled by the swivel mechanism, it is possible to prevent the position of the inner peripheral region of the transport path near the central axis from shifting (shaking) in the direction orthogonal to the extending direction of the tunnel. Can be done. As a result, even when the transport path is swiveled by the swivel mechanism, the transport target can be easily carried into and out of the transport device from the vicinity of the central axis in the inner peripheral region. Therefore, it is possible to more efficiently carry out the carry-in work and the carry-out work for constructing the outer shell tunnel.

In a configuration in which the transport path extends so as to connect the vicinity of the central axis of the main tunnel in the inner peripheral region and the outer peripheral region, preferably, the transport device is arranged near the central axis along the central axis. It is provided with a carry-in / carry-out stand for carrying the transport target into the transport device, or carrying the transport target into the transport device along the central axis, and carrying out the transport target from the transport device. With this configuration, the carry-in / carry-out stand allows the transport target to be carried into and out of the transport device along the central axis, so that the carry-in / carry-out work and carry-out of the transport target can be performed reliably and stably. You can do the work.

In the above-mentioned widening transport device, preferably, the swivel mechanism is formed in an annular shape when viewed from the extending direction of the main tunnel, and the annular portion is formed in an annular shape and the transport path is fixed, and the annular portion is located near the central axis of the main tunnel. It includes a support portion that is rotatably supported and a swivel drive portion that applies a swivel force that swivels around the vicinity of the central axis to the annular portion supported by the support portion. With this configuration, the transport path connecting the inner peripheral region and the outer peripheral region is centered on the main tunnel by turning the annular portion to which the transport path is fixed by the swivel drive section in a state of being supported by the support portion. It is possible to easily realize a configuration in which the tunnel is swiveled around the axis.

In this case, preferably, the swivel drive unit has a rack provided in an annular shape along the inner peripheral surface of the annular portion, a pinion that meshes with the rack, and a motor that rotationally drives the pinion, and the pinion is driven by the motor. Is configured to rotate the annulus around the central axis of the main tunnel through the rack. With this configuration, the transport path can be easily swiveled by the rack and pinion mechanism using the motor as the drive source.

In the widening transport device, preferably, a plurality of transport paths are provided so that a plurality of transport devices can be arranged in the outer peripheral region at the same time. With this configuration, it is possible to carry out carry-in work and carry-out work by a plurality of transport devices at the same time, and it is possible to more efficiently carry out carry-in work and carry-out work for transporting objects for constructing an outer shell tunnel. ..

In this case, the transport path preferably includes an inner peripheral transport path and an outer peripheral transport path arranged on the outer peripheral side of the inner peripheral transport path so as to surround the inner peripheral transport path in the radial direction of the main tunnel. The swivel mechanism is configured to swivel the inner peripheral transport path and the outer peripheral transport path independently of each other around the central axis of the main tunnel. With this configuration, even if the outer peripheral transport path is swiveled, the inner peripheral transport path does not swivel. Therefore, while swiveling the outer peripheral transport path, the transport device installed in the inner peripheral transport path is reliably stopped. In this state, it is possible to carry out the carry-in work and the carry-out work for the transport device that has been stopped reliably. Therefore, it is possible to more efficiently carry out the carry-in work and the carry-out work for constructing the outer shell tunnel.

In a configuration in which a plurality of transport paths are provided so that a plurality of transport devices can be arranged in the outer peripheral region at the same time, the transport paths are preferably in opposite directions from the vicinity of the central axis of the main tunnel when viewed from the extending direction of the main tunnel. Two are provided so as to extend in a cross shape, or four are provided so as to extend in a cross shape from the vicinity of the central axis. With this configuration, multiple transport paths can be arranged in a well-balanced manner in the circumferential direction of the main tunnel, so that the loading and unloading work of the transport target for constructing the outer shell tunnel can be performed more efficiently. Can be done.

In the above-mentioned widening transport device, preferably, the transport device is provided so as to be rotatable with respect to a traveling portion traveling on the transport path and the traveling portion, and the transport device is swiveled by a swivel mechanism in a state where a transport target is placed. Includes a horizontal holding mechanism that keeps the object to be transported horizontal when it is made to move. With this configuration, the horizontal holding mechanism can always keep the transport target horizontal, so that it is possible to prevent the transport target from tilting due to turning. Therefore, it is possible to more efficiently carry out the carry-in work and the carry-out work for constructing the outer shell tunnel.

In this case, preferably, the transport path includes a rail member, and the traveling portion has wheels installed on the rail member and is configured to travel on the rail member via the wheels. With this configuration, the rail member and the wheels allow the traveling portion to stably travel along the rail member.

In a configuration in which the traveling portion travels on the rail member via wheels installed on the rail member, preferably, the transport device applies a driving force for traveling on the rail member to the traveling portion by expansion and contraction. Includes hydraulic cylinders. With this configuration, a relatively large driving force can be obtained from the hydraulic cylinder, so that even a heavy transport target such as an excavator can be stably transported.

According to the present invention, as described above, it is possible to efficiently carry out the carry-in work and the carry-out work for constructing the outer shell tunnel.

It is a schematic cross-sectional view which showed the cross section along the extending direction of the main tunnel of the widening transfer apparatus by 1st Embodiment. FIG. 3 is a cross-sectional view taken along the line 90-90 of FIG. It is sectional drawing along the line 91-91 of FIG. It is sectional drawing along the line 92-92 of FIG. It is sectional drawing along the line 93-93 of FIG. It is a figure for demonstrating the turning by the turning mechanism of the widening transfer apparatus according to 1st Embodiment, and is the figure corresponding to FIG. It is an enlarged view of the transport device located on the central axis of the main line tunnel of FIG. 1, and is the figure which showed the transport device which mounted the excavator pedestal. It is a figure which showed the transport device which mounted the gantry for material and equipment by 1st Embodiment. FIG. 3 is a cross-sectional view taken along the line 94-94 of FIG. It is a schematic diagram which showed the widening transfer apparatus by 2nd Embodiment from the extending direction of the main line tunnel, and is the figure corresponding to FIG. It is a figure explaining the movement of the transport device along one central axis of the transport path of the widening transport device according to the second embodiment. It is a figure explaining the movement of the transport device along the other central axis of the transport path of the widening transport device according to the second embodiment. FIG. 5 is a cross-sectional view taken along the line 95-95 of FIG. FIG. 3 is a cross-sectional view taken along the line 96-96 of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
The configuration of the widening transfer device 100 according to the first embodiment will be described with reference to FIGS. 1 to 9.

(Overall configuration of the widening transfer device)
The overall configuration of the widening transfer device 100 will be described with reference to FIGS. 1 to 3. The widening transfer device 100 is used when a plurality of outer shell tunnels T2 are constructed from the annular outer peripheral region A2 provided on the outer peripheral side of the main tunnel T1 to widen the main tunnel T1. In this way, the outer peripheral region A2 functions as a starting base for constructing the outer shell tunnel T2.

The widening transport device 100 is configured to transport the transport target C including the excavator C1 (shielding machine) for constructing the outer shell tunnel T2 and the equipment C2 (see FIG. 8). Specifically, the widening transport device 100 excavates the transport target C including the excavator C1 and the equipment C2 from the main tunnel T1 to the outer shell tunnel T2, and excavates from the outer shell tunnel T2 to the main tunnel T1. It is used when carrying out the transport target C including the machine C1 and the equipment C2.

In the description, the region on the inner peripheral side of the main line tunnel T1 will be referred to as the inner peripheral region A1, and the region on the outer peripheral side of the inner peripheral region A1 (main line tunnel T1) will be referred to as the outer peripheral region A2.

The widening transport device 100 includes a transport device 4 installed in a transport path 2 connecting the inner peripheral region A1 and the outer peripheral region A2. The widening transport device 100 is configured to transport the transport target C including the excavator C1 for constructing the outer shell tunnel T2 and the material / equipment C2 by the transport device 4.

Further, in the widening transport device 100, the excavator C1 (materials and equipment C2) is swiveled in the annular outer peripheral region A2 by swiveling the transport path 2 around the vicinity of the central axis α of the main tunnel T1 by the swivel mechanism 3. The mounted transport device 4 is configured to be able to be moved to a different position in the outer peripheral region A2 (see FIG. 6). As a result, the excavator C1 can construct a plurality of outer shell tunnels T2 arranged in the circumferential direction on the outer peripheral side of the main tunnel T1. Details will be described later. The "near" in the above-mentioned "swivel the transport path 2 around the central axis α of the main tunnel T1 by the swivel mechanism 3" means the position of the central axis α itself of the main tunnel T1 and the main tunnel T1. Includes both the position of a predetermined central axis in the vicinity of the central axis α of. That is, the swivel mechanism 3 has both a configuration in which the transport path 2 is swiveled around the central axis α of the main tunnel T1 and a configuration in which the transport path 2 is swiveled around a predetermined central axis α in the vicinity of the central axis α of the main tunnel T1. Includes. In this case, the "predetermined central axis" is located at a position different from the central axis α of the main tunnel T1 and is substantially parallel to the central axis α.

Each outer shell tunnel T2 has a circular cross section and is constructed so as to be arranged at equal intervals in the circumferential direction. Each outer shell tunnel T2 is finally configured as a structure for protecting the outer periphery of the main tunnel T1 by being filled with concrete or the like.

Here, in each figure, the extending direction of the main tunnel T1 is indicated by the X direction, one of the X directions is indicated by the X1 direction, and the other is indicated by the X2 direction. In each figure, the vertical direction is shown in the Z direction, the upper direction is shown in the Z1 direction, and the lower direction is shown in the Z2 direction. In the following description, the direction orthogonal to the X direction is referred to as "intersection direction". The "crossing direction" also includes the Z direction.

(Structure of each part of the widening transfer device)
The configuration of each part of the widening transfer device 100 will be described. The widening transport device 100 includes a carry-in / carry-out stand 1, a transport path 2, a swivel mechanism 3, and a transport device 4. In FIG. 2, for convenience of explanation, the transport path 2, the swivel mechanism 3, and the transport device 4 shown in FIG. 1 are not shown.

(Structure of loading / unloading stand)
As shown in FIGS. 1 and 2, the carry-in / carry-out stand 1 is configured to arrange the transferred excavator C1 and the like in the vicinity of the central axis α in the crossing direction. The carry-in / carry-out stand 1 is configured to carry the transport target C into the transport device 4 along the central axis α in a state where the transport device 4 is arranged near the central axis α of the main tunnel T1.

Further, the carry-in / carry-out stand 1 is configured to carry out the transport target C from the transport device 4 along the central axis α in a state where the transport device 4 is arranged near the central axis α of the main line tunnel T1. A pair of loading / unloading pedestals 1 are provided on both sides of the transport device 4 in the X direction.

A lifting machine 10 is provided on the loading / unloading stand 1. The lifting machine 10 is configured to transfer the excavator C1 and the like carried by the transport vehicle 11a traveling on the underground track 11 to the loading / unloading stand 1. The carry-in / carry-out stand 1 extends linearly in the X direction so that the transferred excavator C1 or the like can be moved in the extending direction (X direction) of the main tunnel T1 and carried into the transport device 4. There is.

(Construction of transport path)
The transport path 2 shown in FIG. 3 is a travel path of the transport device 4. That is, the transport path 2 is a movement route of the transport target C including the excavator C1 and the equipment C2 (see FIG. 8) transported by the transport device 4. Note that the transport path 2 has an integrated configuration that is not divided in the middle, unlike the second embodiment described later.

The transport path 2 extends linearly in the radial direction of the main tunnel T1 so as to connect the inner peripheral region A1 and the outer peripheral region A2. The transport path 2 extends in the crossing direction. Further, the transport path 2 extends so as to connect the vicinity of the central axis α in the inner peripheral region A1 and the outer peripheral region A2. Therefore, when the transport device 4 moves along the transport path 2, the distance from the central axis α to the transport device 4 always changes.

A plurality (two) of transport paths 2 are provided so that a plurality of transport devices 4 can be arranged in the outer peripheral region A2 at the same time. The two transport paths 2 are provided so as to extend in opposite directions from the vicinity of the central axis α when viewed from the extending direction (X direction) of the main tunnel T1.

The transport path 2 includes a plurality of (four) rail members 20 extending in the crossing direction (see FIG. 9). The plurality (four) rail members 20 are arranged in parallel with each other and are formed of linearly extending beam members.

Each of the plurality of (four) rail members 20 is arranged at positions corresponding to the corner portions (four corners) of the rectangular region when viewed from a direction orthogonal to the extending direction of the rail member 20. A transfer device 4 is arranged inside a plurality of (four) rail members 20 (rectangular areas). The central axis β of the plurality (four) rail members 20 (rectangular region) is orthogonal to the central axis α of the main tunnel T1.

The central axis β is also the central axis of the transport device 4, and the transport device 4 is configured to linearly move along the central axis β in the crossing direction passing through the central axis α. In the state of FIG. 3, an example in which the transport device 4 moves in the vertical direction (Z direction) along the rail member 20 is shown, but when the rail member 20 is swiveled by the swivel mechanism 3, the rail member 20 is swiveled. The transport device 4 will move diagonally or horizontally (see FIG. 6).

(Structure of swivel mechanism)
As shown in FIG. 3, the swivel mechanism 3 is configured to swive the transport path 2 together with the transport device 4 around the vicinity of the central axis α of the main tunnel T1.

The swivel mechanism 3 provides a swivel force to the annulus portion 30 to which the transport path 2 is fixed, a plurality of support portions 31 (roller support members) for supporting the annulus portion 30, and the annulus portion 30. It includes a drive unit 32 (see FIGS. 4 and 5).

<Structure of the annulus of the swivel mechanism>
The annular portion 30 is formed in an annular shape when viewed from the extending direction (X direction) of the main tunnel T1. Specifically, the annular portion 30 has a shape in which the inner peripheral surface A2a of the outer peripheral region A2 of the annular shape is slightly offset inward when viewed from the X direction. The center position of the annulus portion 30 coincides with the center axis α when viewed from the X direction.

A transport path 2 (rail member 20) is fixed to the annular portion 30 from the inner peripheral side. The main tunnel T1 is arranged on the inner peripheral side of the annular portion 30 when viewed from the X direction. Further, an outer shell tunnel T2 is constructed on the inner peripheral side of the annular portion 30.

The annular portion 30 is provided with a reinforcing member 33 that connects the transport path 2 and the annular portion 30 when viewed from the extending direction (X direction) of the main tunnel T1. The reinforcing member 33 is a plurality of beam members extending linearly in a direction intersecting the transport path 2 (rail member 20) when viewed from the X direction.

<Structure of support part of swivel mechanism>
A plurality of support portions 31 are provided on the inner peripheral surface A2a of the outer peripheral region A2. The support portion 31 is fixed to the inner peripheral surface A2a of the outer peripheral region A2. The plurality of support portions 31 are arranged so as to be spaced apart from each other along the circumferential direction of the annular outer peripheral region A2. The support portions 31 are arranged more on the lower side (Z2 direction) of the annular portion 30 than on the left-right direction side of the annular portion 30 and on the upper side (Z1 direction) side of the annular portion 30.

The support portion 31 has support wheels that come into contact with the annular portion 30, and the support wheels support the annular portion 30 so as to be able to turn around the vicinity of the central axis α. That is, the support portion 31 supports the annular portion 30 so that the rotation center axis of the annular portion 30 and the central axis α coincide with each other. Further, the support portion 31 rotatably supports the transport path 2 fixed to the annular portion 30 around the vicinity of the central axis α via the annular portion 30.

<Structure of swivel drive unit of swivel mechanism>
The swivel drive unit 32 shown in FIGS. 4 and 5 is configured to apply a swivel force for swiveling around the vicinity of the central axis α to the annulus portion 30 supported by the support portion 31. As a result, the swivel drive unit 32 is configured to swivel the transport path 2 around the vicinity of the central axis α.

For example, when the excavation of the predetermined outer shell tunnel T2 is completed, the swivel drive unit 32 goes around the transport path 2 in the vicinity of the central axis α together with the transport device 4 (excavator C1) in order to perform another outer shell tunnel T2. (See Fig. 6). In FIG. 6, for convenience of explanation, the reinforcing material 33 shown in FIG. 3 is not shown.

Specifically, the swivel drive unit 32 includes a rack 32a, a pinion 32b that meshes with the rack 32a, and a motor 32c (including a stator, a rotor, and an output shaft) that rotationally drives the pinion 32b.

The rack 32a is provided in an annular shape along the inner peripheral surface of the annular portion 30. The swivel drive unit 32 is configured to rotate the pinion 32b by the motor 32c so that the annular portion 30 is swiveled around the central axis α via the rack 32a. A plurality (two) of motors 32c are provided on the lower side of the outer peripheral region A2. The motor 32c is fixed to the inner peripheral surface A2a of the outer peripheral region A2 by the motor fixing member F.

(Structure of transport device)
As shown in FIGS. 7 to 9, the transport device 4 includes a traveling portion 40 including a main body portion 41 and a support portion 42, a horizontal holding mechanism 43, and a hydraulic cylinder 44.

The main body 41 has a skeleton structure. The support portion 42 has wheels 42a installed on the rail member 20 and supports the main body portion 41. The traveling portion 40 is configured to travel on the rail member 20 via the wheels 42a.

The horizontal holding mechanism 43 is configured so that the transport target C can be placed. The horizontal holding mechanism 43 is provided so as to be able to turn around the central axis γ of the circular structure 41a, which will be described later, with respect to the traveling portion 40. When the transport path 2 is swiveled around the center axis α by the swivel mechanism 3 in a state where the transport target C is placed, the horizontal holding mechanism 43 is relative to the traveling portion 40 around the center axis γ. It is configured to keep the transport target C horizontal by turning to. The central axis γ is parallel to the central axis α of the main tunnel T1.

The hydraulic cylinder 44 is configured to apply a driving force for traveling on the rail member 20 to the traveling portion 40 by expanding and contracting. Hereinafter, the detailed configuration of each part of the transport device 4 will be described.

<Structure of the traveling part of the transport device>
As described above, the traveling portion 40 includes a main body portion 41 and a support portion 42 having wheels 42a.

The main body 41 includes a hollow circular structure 41a having a circular shape and a pair of overhanging structures 41b. The pair of overhanging structures 41b project along the central axis β to one of the radial outer sides of the circular structure 41a and the other of the radial outer sides of the circular structure 41a (FIG. 7). In the state of, it overhangs upward and downward respectively). That is, the circular structure 41a is arranged between the pair of overhanging structures 41b so as to be sandwiched between the pair of overhanging structures 41b.

A horizontal holding mechanism 43 is installed on the inner peripheral side of the circular structure 41a. That is, on the inner peripheral side of the circular structure 41a, the transport target C including the excavator C1 or the equipment C2 can be mounted (mounted) via the horizontal holding mechanism 43.

A plurality of support portions 42 are provided. The plurality of support portions 42 are fixed to the overhanging structures 41b overhanging on both sides of the circular structure 41a. A plurality (two each) of support portions 42 are provided for one rail member 20.

The support portion 42 is provided with an expansion / contraction mechanism 42b that can be expanded and contracted between the overhanging structure 41b and the wheels 42a. The expansion / contraction mechanism 42b is arranged between the wheel 42a and the connecting portion of the overhanging structure 41b. The expansion / contraction mechanism 42b is hydraulically controlled so as to urge the wheel 42a toward the rail member 20 with a substantially constant force. As a result, the transport device 4 is configured to reliably maintain the contact state between the wheel 42a and the rail member 20.

<Structure of horizontal holding mechanism of transport device>
The horizontal holding mechanism 43 has a support roller 43a, a plurality of elevating devices 43b, a frame for materials and equipment 43c, a frame for excavator 43d, a roller drive device 43e, and a plurality of cylinders for lateral adjustment 43f. ing.

The equipment stand 43c and the excavator stand 43d are each detachable from the elevating device 43b, and are configured to be interchangeable with each other by attachment / detachment. That is, either one of the equipment stand 43c and the excavator stand 43d is selectively attached to the elevating device 43b.

A plurality of support rollers 43a are arranged along the inner peripheral surface of the circular structure 41a when viewed from the X direction. The support roller 43a rotates around the central axis parallel to the central axis γ. The excavator pedestal 43d (material and equipment pedestal 43c) can freely rotate and move in the circumferential direction of the central axis γ along the inner peripheral surface inside the circular structure 41a via the support roller 43a. Is.

The roller drive device 43e is provided at one end of a row of a plurality of support rollers 43a when viewed from the X direction. The roller drive device 43e has a drive roller that rotates around the central axis parallel to the central axis γ, and rotates and drives the drive roller to move the horizontal holding mechanism 43 along the inner peripheral surface of the circular structure 41a. It can be (sliding). That is, at each moving position of the transport device 4 (see FIG. 2), the horizontal holding mechanism 43 is held horizontally by the control of the roller drive device 43e based on the posture calculation of the electric control system (not shown).

As described above, the horizontal holding mechanism 43 has a posture adjusting function in the rolling direction (rotational direction in which the central axis γ of the circular structure 41a is the rotation center axis). That is, the horizontal holding mechanism 43 is arranged so as to be rotatable relative to the traveling portion 40 around the vicinity of the central axis γ extending in the X direction.

Each of the plurality of elevating devices 43b is configured to be able to move up and down independently of each other while supporting different positions of the excavator pedestal 43d (material and equipment pedestal 43c). As a result, the elevating device 43b is configured to be able to adjust the inclination (angle) and height position of the excavator C1 (material and equipment C2) via the excavator pedestal 43d (material and equipment pedestal 43c).

The plurality of lateral adjustment cylinders 43f can be expanded and contracted in the lateral direction (horizontal direction) and moved in the lateral direction of the elevating device 43b so that the position of the elevating device 43b in the lateral direction (horizontal direction) can be adjusted. Has been done.

<Construction of hydraulic cylinder of transport device>
As shown in FIG. 7, the hydraulic cylinder 44 is installed in the circular structure 41a. The hydraulic cylinder 44 is configured to apply a driving force that pushes the traveling portion 40 to one side or the other side of the transport path 2 by expanding and contracting. That is, the transport device 4 including the hydraulic cylinder 44, which is a drive source, is a self-propelled transport device that runs on the transport path 2.

One hydraulic cylinder 44 is provided on one side of the central axis γ and one on the other side in the extending direction of the transport path 2 (direction in which the central axis β extends).

The hydraulic cylinder 44 is provided with a lock mechanism 44a that can engage with and disengage from the rail member 20. The hydraulic cylinder 44 is configured to engage the rail member 20 via the lock mechanism 44a.

One end of the hydraulic cylinder 44 is installed in the circular structure 41a, and the other end (rod side) is engaged with the rail member 20 via the lock mechanism 44a. Specifically, the rail member 20 is provided with a plurality of engaging holes 44b arranged in the extending direction of the rail member 20. The lock mechanism 44a has a stretchable engagement pin P, and is configured to engage with any of the plurality of engagement holes 44b via the engagement pin P.

The transport device 4 is configured to travel on the rail member 20 by repeating expansion and contraction of the hydraulic cylinder 44 while changing the engagement position of the engagement pin P of the lock mechanism 44a with respect to the plurality of engagement holes 44b. There is.

(Delivery operation of the object to be transported by the widening transfer device)
With reference to FIGS. 1, 3 and 7, the carrying-in operation of the transport target C by the widening transport device 100 will be described.

First, the transport target C is transported into the main tunnel T1 by the transport vehicle 11a traveling on the underground track 11.

Next, the lifting machine 10 transfers the transport target C loaded on the transport vehicle 11a to the carry-in / carry-out stand 1.

Next, with the transport device 4 arranged near the central axis α of the main tunnel T1 (near the center of the inner peripheral region A1 when viewed from the X direction), the transport target is transported along the central axis α by the carry-in / carry-out stand 1. C is moved and the transport target C is loaded into the transport device 4. Since the transport device 4 is arranged near the central axis α of the main tunnel T1 during this loading operation, it is possible to simultaneously perform the swivel operation of the transport path 2 by the swivel mechanism 3 as needed. be.

Next, by moving the transport device 4 along the transport path 2 connecting the inner peripheral region A1 and the outer peripheral region A2, the transport device 4 moves from the inner peripheral region A1 to the outer peripheral region A2 together with the transport target C.

Then, when the excavation of the predetermined outer shell tunnel T2 is completed, the transport path 2 is swiveled around the central axis α together with the transport device 4 (excavator C1) in order to excavate another outer shell tunnel T2. The tunnel. It should be noted that the transfer device 4 may be turned in a state of being arranged near the central axis α. In this case, the position of the transport device 4 in the crossing direction does not change (omitted).

(Effect of the first embodiment)
In the first embodiment, the following effects can be obtained.

In the first embodiment, as described above, the transport path 2 connecting the inner peripheral region A1 on the inner peripheral side of the main tunnel T1 and the outer peripheral region A2 on the outer peripheral side and the transport path 2 are located near the central axis α of the main tunnel T1. A swivel mechanism 3 that swivels around, and a transport device that is installed in the transport path 2 and moves along the transport path 2 to transport the transport target C including the excavator C1 and the equipment C2 that construct the outer shell tunnel T2. 4 and are provided. As a result, the transport device 4 is installed, and the transport path 2 connecting the inner peripheral region A1 and the outer peripheral region A2 can be swiveled around the central axis α of the main tunnel T1 by the swivel mechanism 3. Therefore, the transport path 2 can be swiveled by the swivel mechanism 3 in a state where the inner peripheral region A1 and the outer peripheral region A2 are connected by the transport path 2. That is, the transport path 2 is swiveled by the swivel mechanism 3 while the transport target C is carried into the transport device 4 of the transport path 2 in the inner peripheral region A1 or the transport target C is carried out from the transport device 4 of the transport path 2. be able to. As a result, when the carry-in work and the carry-out work are performed, the transport path 2 can be turned in parallel, so that the carry-in work and the carry-out work of the transport target C for constructing the outer shell tunnel T2 can be efficiently performed. It can be carried out.

In the first embodiment, as described above, the transport path 2 extends linearly in the radial direction of the main tunnel T1 so as to connect the inner peripheral region A1 and the outer peripheral region A2. As a result, since the transport path 2 extends linearly in the radial direction of the main tunnel T1, the transport target C is carried in and out via the transport path 2 that connects the inner peripheral region A1 and the outer peripheral region A2 by the shortest distance. can do. Therefore, the carry-in work and the carry-out work of the transport target C for constructing the outer shell tunnel T2 can be performed more efficiently.

In the first embodiment, as described above, the transport path 2 extends so as to connect the vicinity of the central axis α of the main tunnel T1 in the inner peripheral region A1 and the outer peripheral region A2. As a result, the vicinity of the central axis α in the inner peripheral region A1 and the outer peripheral region A2 can be connected by the transport path 2, so that the transport path 2 (conveyor device 4) is arranged near the swivel center by the swivel mechanism 3. can do. Therefore, when the transport path 2 is swiveled by the swivel mechanism 3, the position of the inner peripheral region A1 of the transport path 2 near the central axis α is displaced (blurred) in a direction orthogonal to the extending direction of the tunnel. Can be suppressed. As a result, even when the transport path 2 is swiveled by the swivel mechanism 3, the transport target C is easily carried into the transport device 4 from the vicinity of the central axis α in the inner peripheral region A1 and from the transport device 4. Can be carried out. Therefore, the carry-in work and the carry-out work of the transport target C for constructing the outer shell tunnel T2 can be performed more efficiently.

In the first embodiment, as described above, in a state where the transport device 4 is arranged near the central axis α, the transport target C is carried into the transport device 4 along the central axis α, or the central axis line is described. A carry-in / carry-out stand 1 for carrying the transport target C into the transport device 4 along α and carrying it out from the transport device 4 is provided. As a result, the carry-in / carry-out stand 1 can carry the transport target C into the transport device 4 along the central axis α and also carry it out from the transport device 4, so that the carry-in work of the transport target C can be performed reliably and stably. And can carry out the carry-out work.

In the first embodiment, as described above, the swivel mechanism 3 has an annular portion 30 formed in an annular shape when viewed from the extending direction of the main tunnel T1 and to which the transport path 2 is fixed, and the annular portion 30. A swivel that imparts a swivel force to swivel around the central axis α of the support portion 31 that is rotatably supported around the central axis α of the main tunnel T1 and the annulus portion 30 that is supported by the support portion 31. The drive unit 32 and the like are included. As a result, in a state where the annular portion 30 to which the transport path 2 is fixed is supported by the support portion 31, the transport path 2 connecting the inner peripheral region A1 and the outer peripheral region A2 is turned by the swivel drive portion 32 to form the main line. It is possible to easily realize a configuration in which the tunnel T1 is swiveled around the central axis α.

In the first embodiment, as described above, the swivel drive unit 32 rotationally drives the rack 32a provided in an annular shape along the inner peripheral surface of the annular portion 30, the pinion 32b that meshes with the rack 32a, and the pinion 32b. By rotating the pinion 32b by the motor 32c, the annulus portion 30 is configured to rotate around the central axis α of the main tunnel T1 via the rack 32a. As a result, the transport path 2 can be easily swiveled by the rack and pinion mechanism using the motor 32c as a drive source.

In the first embodiment, as described above, a plurality of transport paths 2 are provided so that a plurality of transport devices 4 can be arranged in the outer peripheral region A2 at the same time. As a result, it becomes possible to carry out the carry-in work and the carry-out work by the plurality of transport devices 4 at the same time, and it is possible to carry out the carry-in work and the carry-out work of the transport target C more efficiently in order to construct the outer shell tunnel T2.

In the first embodiment, as described above, two transport paths 2 are provided so as to extend in opposite directions from the vicinity of the central axis α of the main line tunnel T1 when viewed from the extending direction of the main line tunnel T1. As a result, a plurality of transport paths 2 can be arranged in a well-balanced manner in the circumferential direction of the main tunnel T1, so that the carry-in work and the carry-out work of the transport target C can be performed more efficiently in order to construct the outer shell tunnel T2. can.

In the first embodiment, as described above, the transport device 4 is provided so as to be rotatable with respect to the traveling unit 40 traveling on the transport path 2 and the traveling unit 40, and the transport target C is placed on the traveling unit 40. It includes a horizontal holding mechanism 43 that keeps the transport target C horizontal when the transport path 2 is swiveled by the swivel mechanism 3. As a result, the horizontal holding mechanism 43 can always keep the transport target C horizontal, so that it is possible to prevent the transport target C from tilting due to turning. Therefore, the carry-in work and the carry-out work of the transport target C for constructing the outer shell tunnel T2 can be performed more efficiently.

In the first embodiment, as described above, the transport path 2 includes the rail member 20, the traveling portion 40 has the wheels 42a installed on the rail member 20, and the traveling portion 40 is on the rail member 20 via the wheels 42a. It is configured to run on. As a result, the rail member 20 and the wheels 42a allow the traveling portion 40 to stably travel along the rail member 20.

In the first embodiment, as described above, the transport device 4 includes a hydraulic cylinder 44 that applies a driving force for traveling on the rail member 20 to the traveling portion 40 by expansion and contraction. As a result, a relatively large driving force can be obtained from the hydraulic cylinder 44, so that even a heavy transport target C such as an excavator C1 can be stably transported.

[Second Embodiment]
A second embodiment will be described with reference to FIGS. 10 to 14. This second embodiment is different from the first embodiment, which has an integrated configuration in which the transport path 2 is not divided in the middle, and the inner peripheral transport path 202a and the inner peripheral transport path 202a in which the transport path 202 is divided into each other in the middle. An example including the outer peripheral transport path 202b will be described. In the figure, the same configurations as those in the first embodiment are designated by the same reference numerals.

As shown in FIG. 10, the widening transport device 200 according to the second embodiment includes a carry-in / carry-out stand 1 (see FIG. 1), a transport path 202 including an inner peripheral transport path 202a and an outer peripheral transport path 202b, and an outer peripheral transport path. The swivel mechanism 3 of 202b, the transport device 4, and the swivel mechanism 203 of the inner peripheral transport path 202a are provided. In FIGS. 10, 11 and 12, for convenience of explanation, the support portion 231, the swivel drive portion 232 and the foundation support portion 233 included in the swivel mechanism 203 are not shown.

Four transport paths 202 are provided so as to extend in a cross shape (radial) from the vicinity of the central axis α when viewed from the extending direction (X direction) of the main tunnel T1. The transport path 202 has central axes β1 and β2 that are orthogonal to each other. One inner peripheral transport path 202a is provided near the central axis α when viewed from the X direction.

Four outer peripheral transport paths 202b are provided around the inner peripheral transport path 202a at 90-degree intervals when viewed from the X direction. The outer peripheral transport path 202b is arranged on the outer peripheral side of the inner peripheral transport path 202a so as to surround the inner peripheral transport path 202a in the radial direction of the main tunnel T1.

The swivel mechanism 3 is configured to swivel the outer peripheral transport path 202b around the vicinity of the central axis α. Further, the swivel mechanism 203 is configured to swivel the inner peripheral transport path 202a around the vicinity of the central axis α. That is, the swivel mechanism 3 and the swivel mechanism 203 are configured to swivel the inner peripheral transport path 202a and the outer peripheral transport path 202b independently of each other around the central axis α.

In the state of FIG. 10, an example in which the inner peripheral transport path 202a is connected to the outer peripheral transport path 202b of the central axis β1 is shown, but the inner peripheral transport path is provided by at least one of the swivel mechanism 3 and the swivel mechanism 203. When the 202a is swiveled relative to the outer peripheral transport path 202b, the inner peripheral transport path 202a is connected to the outer peripheral transport path 202b of the central axis β2.

That is, as shown in FIGS. 11 and 12, the widening transport device 200 is in a state where the transport device 4 can be moved between the inner peripheral transport path 202a and the outer peripheral transport path 202b whose central axis is β1. , The state in which the transport device 4 can be moved between the inner peripheral transport path 202a and the outer peripheral transport path 202b whose central axis is β2 can be switched.

(Structure of a swivel mechanism that swivels the inner peripheral transport path)
The swivel mechanism 203 shown in FIGS. 13 and 14 is configured to swive the inner peripheral transport path 202a around the vicinity of the central axis α of the main tunnel T1. The swivel mechanism 203 has the same configuration as the swivel mechanism 3.

That is, the swivel mechanism 203 has a swivel force with respect to the annular portion 230 to which the inner peripheral transport path 202a is fixed, the plurality of support portions 231 (roller support members) that support the annular portion 230, and the annular portion 230. 232 and the turning drive unit 232.

Further, the swivel mechanism 203 includes a foundation support portion 233. The foundation support portion 233 is fixed to the inner peripheral surface of the main tunnel T1, and the support portion 231 is directly installed. The foundation support portion 233 is composed of a rectangular frame-shaped beam portion and an annular beam portion arranged inside the rectangular frame-shaped beam portion. The plurality of support portions 231 are directly fixed to the inner peripheral surface 233a of the annular beam portion of the foundation support portion 233.

<Structure of the annular part of the swivel mechanism that swivels the inner peripheral transport path>
The annulus 230 is arranged on the inner peripheral side of the annulus 30 and the main tunnel T1 when viewed from the extending direction (X direction) of the main tunnel T1, and is formed into an annulus having a diameter smaller than that of the annulus 30. ing. The center position of the annulus 230 coincides with the central axis α (the center position of the annulus 30) when viewed from the X direction.

<Structure of the support part of the swivel mechanism that swivels the inner peripheral transport path>
As described above, the plurality of support portions 231 are fixed to the annular inner peripheral surface 233a of the foundation support portion 233. The plurality of support portions 231 are arranged so as to be spaced apart from each other along the circumferential direction of the annular portion 230.

The support portion 231 has a support wheel in contact with the annular portion 230, and the support wheel supports the annular portion 230 so as to be able to turn around the vicinity of the central axis α. That is, the support portion 231 supports the annular portion 230 so that the rotation center axis of the annular portion 230 and the central axis α coincide with each other.

Further, the support portion 231 supports the annular portion 30 so as to sandwich the annular portion 30 from both sides in the X direction of the annular portion 30. That is, the support portion 231 also functions as the positioning of the annular portion 30 (inner peripheral transport path 202a) in the X direction.

<Structure of the swivel drive unit of the swivel mechanism that swivels the inner peripheral transport path>
The swivel drive unit 232 is configured to apply a swivel force for swiveling around the central axis α to the annular portion 230 supported by the support portion 231. As a result, the swivel drive unit 232 is configured to swivel the transport path 2 around the vicinity of the central axis α.

The swivel drive unit 232 includes a rack 232a, a pinion 232b that meshes with the rack 232a, and a motor 232c (including a stator, a rotor, and an output shaft) that rotationally drives the pinion 232b.

The rack 232a is provided in an annular shape along the inner peripheral surface of the annular portion 230. The swivel drive unit 232 is configured to rotate the pinion 232b by the motor 232c so that the annular portion 230 is swiveled around the central axis α via the rack 232a. The motor 232c is fixed to, for example, the foundation support portion 233.

(Effect of the second embodiment)
In the second embodiment, the following effects can be obtained.

In the second embodiment, as described above, the transport path 202 connecting the inner peripheral region A1 on the inner peripheral side of the main tunnel T1 and the outer peripheral region A2 on the outer peripheral side and the transport path 202 are located near the central axis α of the main tunnel T1. A swivel mechanism 3 that swivels around, and a transport device that is installed in the transport path 202 and moves along the transport path 202 to transport the transport target C including the excavator C1 and the equipment C2 that construct the outer shell tunnel T2. 4 and are provided. Thereby, as in the first embodiment, the carry-in work and the carry-out work of the transport target C for constructing the outer shell tunnel T2 can be efficiently performed.

In the second embodiment, as described above, the transport path 202 is arranged on the outer peripheral side of the inner peripheral transport path 202a so as to surround the inner peripheral transport path 202a in the radial direction of the inner peripheral transport path 202a and the main tunnel T1. Including the outer peripheral transport path 202b, the swivel mechanism 3 is configured to swive the inner peripheral transport path 202a and the outer peripheral transport path 202b independently of each other around the central axis α of the main tunnel T1. .. As a result, even if the outer peripheral transport path 202b is swiveled, the inner peripheral transport path 202a does not swivel. In the stopped state, the carry-in work and the carry-out work can be performed on the surely stopped transfer device 4. Therefore, the carry-in work and the carry-out work of the transport target C for constructing the outer shell tunnel T2 can be performed more efficiently.

In the second embodiment, as described above, four transport paths 202 are provided so as to extend in a cross shape from the vicinity of the central axis α when viewed from the extending direction of the main tunnel T1. As a result, a plurality of transport paths 202 can be arranged in a well-balanced manner in the circumferential direction of the main tunnel T1, so that the carry-in work and the carry-out work of the transport target C for constructing the outer shell tunnel T2 can be performed more efficiently. Can be done.

[Modification example]
The embodiments disclosed this time should be considered to be exemplary and not restrictive in all respects. The scope of the present invention is shown not by the description of the above embodiment but by the scope of claims, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

For example, in the first and second embodiments described above, an example in which two or four transport paths are provided is shown, but the present invention is not limited to this. In the present invention, one, three, or five or more transport paths may be provided.

Further, in the first and second embodiments described above, an example in which the transport path is reinforced with a reinforcing material is shown, but the present invention is not limited to this. In the present invention, it is not necessary to provide a reinforcing material.

Further, in the first and second embodiments, the example in which the transport device is moved by the hydraulic cylinder is shown, but the present invention is not limited to this. In the present invention, the transport device may be moved by a rack and pinion mechanism or the like whose drive source is a motor.

Further, in the first and second embodiments, the example in which the transport path is swiveled by a rack and pinion mechanism using a motor as a drive source is shown, but the present invention is not limited to this. In the present invention, the transport path may be swiveled by a hydraulic cylinder or the like.

Further, in the first and second embodiments, the example in which the transport path is formed in a straight line is shown, but the present invention is not limited to this. In the present invention, the transport path may be formed in a shape other than a straight line such as an S-shape, a curved shape, or a bent shape.

Further, in the first and second embodiments, the example in which the transport path is arranged near the central axis of the main tunnel in the inner peripheral region is shown, but the present invention is not limited to this. In the present invention, the transport path may be arranged at a position deviated from the central axis of the main tunnel in the inner peripheral region.

Further, in the first and second embodiments, an example is shown in which the transport device is configured to carry out the carry-in (carry-out) work at one place in the inner peripheral region by the carry-in / carry-out stand. Not limited to this. In the present invention, the carry-in / carry-out stand may be configured to carry out carry-in (carry-out) work on the transport device at a plurality of locations in the inner peripheral region.

Further, in the first and second embodiments, an example is shown in which a support portion (roller support member) that rotatably supports the annular portion is fixed to the inner peripheral surface of the outer peripheral region, but the present invention relates to this. Not limited. In the present invention, the support portion (roller support member) may be fixed to the annular portion so that the support portion is brought into contact with the inner peripheral surface of the outer peripheral region.

Further, in the first and second embodiments, the example in which the horizontal holding mechanism is configured to hold the horizontal posture by the electric control system is shown, but the present invention is not limited to this. In the present invention, the horizontal holding mechanism may be configured to hold the horizontal posture by its own weight.

Further, in the first and second embodiments, an example is shown in which a plurality of transport paths are arranged evenly in a well-balanced manner in the circumferential direction of the main tunnel at equal angle intervals, but the present invention is not limited to this. In the present invention, it is not necessary to arrange a plurality of transport paths at equal angle intervals.

1 Carry-in / carry-out stand 2,202 Transport path 3 Swing mechanism 4 Transport device 20 Rail member 30, 230 Circular section 31 Support section 32 Swive drive section 32a Rack 32b Pinion 32c Motor 40 Travel section 42a Wheel 43 Horizontal holding mechanism 44 Hydraulic cylinder 100 , 200 Widening transport device 202a Inner circumference transport path 202b Outer circumference transport path A1 Inner circumference area A2 Outer circumference area C Transport target C1 Excavator C2 Materials and equipment T1 Main line tunnel T2 Outer shell tunnel α (of main line tunnel) Central axis

Claims (12)

A widening transport device used when constructing a plurality of outer shell tunnels from an annular outer peripheral region provided on the outer peripheral side of the main tunnel and widening the main tunnel.
A transport path connecting the inner peripheral region on the inner peripheral side of the main tunnel and the outer peripheral region on the outer peripheral side,
A swivel mechanism that swivels the transport path around the central axis of the main tunnel, and
A widening transport device including a transport device installed in the transport path, moving along the transport path, and transporting a transport target including an excavator for constructing the outer shell tunnel and materials and equipment. The widening transport device according to claim 1, wherein the transport path extends linearly in the radial direction of the main tunnel so as to connect the inner peripheral region and the outer peripheral region. The widening transport device according to claim 2, wherein the transport path extends so as to connect the vicinity of the central axis of the inner peripheral region and the outer peripheral region. With the transport device arranged near the central axis, the transport target is carried into the transport device along the central axis, or the transport target is carried out from the transport device along the central axis. The widening transport device according to claim 3, further comprising a carry-in / carry-out stand. The swivel mechanism
An annular portion formed in an annular shape when viewed from the extending direction of the main tunnel and to which the transport path is fixed.
A support portion that rotatably supports the annulus portion around the vicinity of the central axis, and a support portion.
The widening according to any one of claims 1 to 4, comprising a swivel drive portion that applies a swivel force for swiveling around the central axis to the annulus portion supported by the support portion. Conveyor device. The swivel drive unit
It has a rack provided in an annular shape along the inner peripheral surface of the annular portion, a pinion that meshes with the rack, and a motor that rotationally drives the pinion.
The widening transfer device according to claim 5, wherein the pinion is rotated by the motor to rotate the annulus portion around the central axis via the rack. The widening transport device according to any one of claims 1 to 6, wherein the transport path is provided in plurality so that a plurality of the transport devices can be arranged in the outer peripheral region at the same time. The transport path is
Inner circumference transport path and
Including the outer peripheral transport path arranged on the outer peripheral side of the inner peripheral transport path so as to surround the inner peripheral transport path in the radial direction of the main tunnel.
The widening transport device according to claim 7, wherein the swivel mechanism is configured to swive the inner peripheral transport path and the outer peripheral transport path independently of each other around the central axis. When viewed from the extending direction of the main line tunnel, two transport paths are provided so as to extend in opposite directions from the vicinity of the central axis, or four are provided so as to extend in a cross shape from the vicinity of the central axis. The widening transfer device according to claim 7 or 8. The transport device is
A traveling unit traveling on the transport path and a traveling unit
The claim includes a horizontal holding mechanism that is provided so as to be rotatable with respect to the traveling portion and that keeps the transport target horizontal when the transport path is swiveled by the swivel mechanism in a state where the transport target is placed. The widening transfer device according to any one of 1 to 9. The transport path includes rail members.
The widening transfer device according to claim 10, wherein the traveling portion has wheels installed on the rail member and is configured to travel on the rail member via the wheels. The widening transport device according to claim 11, wherein the transport device includes a hydraulic cylinder that applies a driving force for traveling on the rail member to the traveling portion by expansion and contraction.

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