Rail-road transport trolley

Abstract

The objective is to provide a rail-road transport trolley 1 that can transport a large reinforcing cage 2 while traveling on the railway tracks L without interrupting the power supply. [Solution] The rail-road transport trolley 1 is characterized by comprising a loading platform 10 for loading a reinforcing cage 2 with a substantially circular cross-section extending in the front-rear direction X, a pair of two sets of wheels 60 for traveling on rails L, a power unit 30 for driving the wheels 60, a pair of crawlers 50 for traveling on the ground outside of rails L, and a wheel lifting mechanism 70 for switching the wheels 60 between a traveling position and a storage position located above the lower end of the crawlers 50 by raising and lowering, the pair of crawlers 50 being arranged at a predetermined distance apart in the width direction Y, and the loading platform 10 having a substantially grooved loading platform groove 14 extending in the front-rear direction X between the pair of crawlers 50.

Description

Technical Field

[0001] The present invention relates to a rail-land carrier that travels on the ground outside the track and on the track, for example, to transport a large-diameter steel bar cage.

Background Art

[0002] Conventionally, in track construction and platform construction, a rail-land vehicle that can travel on both the track and the ground outside the track is known as a vehicle for transporting materials and equipment (see Patent Document 1).

[0003] Specifically, the rail-land vehicle of Patent Document 1 is a vehicle such as a four-wheel truck having tires for traveling on the ground outside the track, and is equipped with wheels for traveling on the track. It is configured to be able to switch between a ground traveling state in which it travels on the ground by the tires and a track traveling state in which it travels on the track by the wheels by raising and lowering the wheels.

[0004] By the way, in a rail-land vehicle such as that of Patent Document 1, the height of the loading surface of the loading platform tends to increase due to a tire suspension device or the like. For this reason, for example, when transporting a large-sized load such as a large-diameter steel bar cage in a state where the axial direction is laid along the extension direction of the track, in the track traveling state of Patent Document 1, there is a risk that the load may approach the overhead line above the track.

[0005] In the case of a large load approaching the overhead line above the track as described above, it is conceivable to transport the load after the track is closed and the power supply is stopped. However, the power supply stop time becomes a limited short time after the track is closed. For this reason, there is a risk that sufficient time required to load the load from outside the track onto the track and transport it on the track cannot be secured after the track is closed and the power supply is stopped.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

[0007] In view of the above-mentioned problems, the present invention aims to provide a rail-road transport trolley that can travel on railway tracks and transport large loads without interrupting the power supply. [Means for solving the problem]

[0008] This invention is a rail-road transport trolley comprising: a loading platform for carrying loads extending in the direction of extension of the railway tracks; at least one pair of wheels for traveling on the railway tracks; wheel driving means for driving the wheels; at least one pair of crawlers for traveling on the ground outside the railway tracks; and wheel lifting means for switching the wheels between a traveling position and a stowed position located above the lower end of the crawlers by raising and lowering, wherein the pair of crawlers are arranged at a predetermined distance apart in the direction of the track width which is substantially perpendicular to the extension direction in a plan view, and the loading platform is provided with a substantially concave groove portion between the pair of crawlers that extends in the direction of extension.

[0009] The above-mentioned cargo extending in the direction of extension refers to cargo that is roughly cylindrical in shape and extends in the direction of extension, cargo that is roughly cylindrical in shape and extends in the direction of extension, or cargo that is narrower than the length in the track width direction in the groove of the cargo bed and has a roughly rectangular cross-section that extends in the direction of extension. The above-mentioned recessed grooves on the cargo bed refer to grooves with a roughly inverted trapezoidal cross-section, grooves with a roughly rectangular cross-section, or grooves with a roughly semicircular cross-section.

[0010] According to this invention, since the vehicle travels on the ground outside the railway tracks using a pair of crawlers, it does not require a suspension system or the like, compared to, for example, a rail-road transport vehicle that travels on the ground outside the railway tracks using tires, and therefore the height of the loading surface of the cargo bed can be kept low.

[0011] Furthermore, the grooves in the loading platform allow the rail-road transport trolley to load cargo so that a portion of it fits into these grooves. As a result, the overall height of the rail-road transport trolley when loaded can be kept lower compared to when cargo is loaded onto a loading platform with a nearly flat surface.

[0012] As a result, the rail-road transport trolley can ensure a wider gap between large loads and overhead wires above the railway tracks compared to when large loads are loaded onto a loading platform with a nearly flat surface. Therefore, since the rail-road transport trolley can travel on the tracks without stopping the power supply and transport large loads, it is possible to reduce the man-hours and costs required for transporting loads. In addition, rail-road transport trolleys can keep the center of gravity low when loaded with large loads, allowing for the safe and stable transport of large loads.

[0013] In one aspect of this invention, the wheel lifting means may be pivotably connected to a frame that supports the loading platform and may also include a support arm that supports the wheel, and an extendable actuator having one end connected to the frame and the other end connected to the support arm.

[0014] With this configuration, the extension and retraction of the actuator allows the support arm to rotate clockwise or counterclockwise around the connection point with the frame, thereby raising and lowering the wheels. This allows the wheels to be raised and lowered between the travel position and the stowed position with a simple configuration. This makes it possible to suppress the overall height of the rail-road transport trolley when loaded, even if the wheel lifting mechanism is located below the loading platform.

[0015] In another aspect of this invention, the wheel lifting means may be configured to raise and lower the cargo bed by extending or retracting the actuator when the wheels are in the travel position. This configuration eliminates the need to separately install a mechanism for raising and lowering the cargo bed below the cargo bed, thus allowing for a lower overall height when loaded.

[0016] Furthermore, the rail-road transport trolley allows for easy adjustment of the height of the loading surface of the loading platform to match the height of the unloading location of the loaded goods, without the need for a separate means of raising and lowering the loading platform. This facilitates the transfer of goods from the loading platform to the unloading location.

[0017] In addition, by lowering the height of the loading surface of the platform to lower the height of the unloading area during transport, and then raising the platform upon arrival at the unloading area, the rail-road transport vehicle can keep its center of gravity low during transport, allowing for safer transport of large-diameter loads.

[0018] In another aspect of this invention, a cargo handling assistance mechanism may be provided that pushes upward the cargo, which has a substantially circular cross-section, loaded onto the cargo bed. This configuration makes it easier to remove the load from the groove in the loading platform compared to, for example, pulling the load to one side in the track width direction with a chill wheel to remove it from the groove in the loading platform. This allows rail-road transport trolleys to reduce the burden on workers who move the load on the platform, and also reduces the man-hours required for transporting the load.

[0019] In another aspect of this invention, the cargo handling assistance mechanism may be configured such that two units are arranged opposite each other in the direction of the track width, and each unit independently pushes up the load. With this configuration, for example, by having the two cargo handling assistance mechanisms start operating at different timings, or by having the two cargo handling assistance mechanisms start operating at different operating speeds, the load can be guided to move toward one side in the direction of the track width while being pushed upward. This allows the rail-road transport trolley to easily move its load to one side in the direction of the track width, thereby further reducing the burden on workers who move the load on the trolley.

[0020] Also, as an aspect of the present invention, the cargo handling assistance mechanism portion may be provided with a guiding portion that guides the loaded cargo toward one side in the track width direction. According to this configuration, it is possible to escape the loaded cargo from the cargo bed concave groove portion while guiding the loaded cargo toward one side in the track width direction. From this, the rail - land transport cart can further facilitate the movement of the loaded cargo on the cargo bed toward the platform when, for example, delivering the loaded cargo on the cargo bed to the platform.

[0021] Also, as an aspect of the present invention, the guiding portion may be configured to guide the loaded cargo toward one side in the track width direction by rotation about a rotation axis in the extending direction. According to this configuration, it is possible to guide a loaded cargo having a substantially circular cross - sectional shape to roll toward one side in the track width direction.

[0022] Thereby, since the escape of the loaded cargo from the cargo bed concave groove portion becomes easier, the rail - land transport cart can reduce the man - hours required for transporting the loaded cargo and can reduce the burden on the operator moving the loaded cargo on the cargo bed.

[0023] Also, as an aspect of the present invention, the guiding portion may be configured to protrude and retract through an opening provided in the cargo bed concave groove portion. According to this configuration, the guiding portion can be formed into an appropriate shape suitable for guiding the loaded cargo, rather than a shape that forms a part of the cargo bed concave groove portion. Thereby, since the rail - land transport cart can guide the loaded cargo more efficiently, the burden on the operator moving the loaded cargo on the cargo bed can be further reduced.

[0024] Also, as an aspect of the present invention, the guiding portion may be constituted by a part of the cargo bed concave groove portion. According to this configuration, the unevenness of the cargo bed concave groove portion can be suppressed. Thereby, since the rail - land transport cart can load the loaded cargo in a stable state, it can transport a large - diameter loaded cargo more safely.

[0025] In another aspect of this invention, the pair of crawlers may be positioned outside the track width direction of the pair of wheels and the wheel lifting means. This configuration ensures sufficient length in the track width direction and vertical length in the grooved portion of the cargo bed, thus reliably keeping the overall height low when carrying large loads.

[0026] Furthermore, in this embodiment of the invention, the vehicle may be provided with a seat on which a crew member sits, and a means for receiving driving operations performed by the crew member for driving on the railway tracks and driving operations performed by the crew member for driving on the ground outside the railway tracks.

[0027] This configuration allows the vehicle to move under its own power without being towed on or off the tracks, thus facilitating movement on both the tracks and off the tracks. This allows the mobile transport trolley to improve the efficiency of transporting its cargo. [Effects of the Invention]

[0028] The present invention provides a rail-road transport trolley that can travel on railway tracks and transport large loads without interrupting the power supply. [Brief explanation of the drawing]

[0029] [Figure 1] An external perspective view showing the appearance of a rail-road transport trolley in track operation. [Figure 2] A side view showing the side of a rail-road transport trolley in a track-running state. [Figure 3] Cross-sectional view taken along arrow AA in Figure 2. [Figure 4] An explanatory diagram showing the wheel's travel position and stowed position. [Figure 5] An explanatory diagram illustrating the cargo handling assistance mechanism in a cross-sectional view taken along arrow AA. [Figure 6] A flowchart showing the process for transporting reinforcing bars in a cage. [Figure 7] An explanatory diagram showing the preparation process in the cross-sectional view taken along arrow AA. [Figure 8] An explanatory diagram showing how to install the first and second chill wheels. [Figure 9] An explanatory diagram illustrating the first unloading process in a cross-sectional view taken along arrow AA. [Figure 10] An explanatory diagram illustrating the second unloading process in a cross-sectional view along arrow AA. [Figure 11] An explanatory diagram illustrating the second unloading process in a cross-sectional view along arrow AA. [Figure 12] Cross-sectional view of a rail-road transport trolley in another embodiment, viewed from the direction of arrow AA. [Modes for carrying out the invention]

[0030] One embodiment of this invention will be described below with reference to the drawings. In this embodiment, for example, a rail-road transport trolley 1 that transports a reinforcing cage 2 loaded on the ground outside the railway tracks L to a platform P by traveling along a pair of railway tracks L will be described with reference to Figures 1 to 5. Figure 1 shows an external perspective view of the rail-road transport trolley 1 in track running condition, Figure 2 shows a side view of the rail-road transport trolley 1 in track running condition, Figure 3 shows a cross-sectional view taken along arrow AA in Figure 2, Figure 4 shows an explanatory diagram illustrating the running position and stowed position of the wheels 60, and Figure 5 shows an explanatory diagram illustrating the cargo handling assistance mechanism 80 in a cross-sectional view taken along arrow AA.

[0031] Furthermore, to clarify the illustrations, the reinforcing cage 2 is shown as a dashed line in Figure 1, and the crawler 50, wheel 60, and wheel lifting mechanism 70 are shown as dashed lines in Figures 3 and 5.

[0032] Furthermore, the arrow X in the figure indicates the longitudinal direction of the rail-road transport vehicle 1 (hereinafter referred to as the longitudinal direction X), and the arrow Y in the figure indicates the width direction of the rail-road transport vehicle 1 (hereinafter referred to as the width direction Y), which is approximately perpendicular to the longitudinal direction X in a plan view.

[0033] First, the load transported by the rail-road transport trolley 1 of this embodiment is a reinforcing cage 2 formed in a cylindrical shape with a substantially circular cross-section, as shown in Figures 1 and 2. This reinforcing cage 2 has a substantially circular cross-section with a diameter larger than the spacing of the rails L (rail width) and smaller than the width of the vehicle clearance in the horizontal direction, for example, a large diameter of 2800 mm. As shown in Figures 1 and 2, the reinforcing cage 2 is loaded onto the rail-road transport trolley 1 in a horizontal position so that its axial direction is approximately parallel to the longitudinal direction X of the rail-road transport trolley 1, and then transported.

[0034] As shown in Figure 1, the rail-road transport trolley 1 for transporting such a reinforcing cage 2 is configured to be able to travel on the rail L such that the longitudinal direction X is approximately parallel to the extension direction of the rail L, and the width direction Y is approximately parallel to the rail width direction which is approximately perpendicular to the extension direction in a plan view.

[0035] Specifically, as shown in Figure 1, the rail-road transport trolley 1 comprises a loading platform 10 for loading a reinforcing cage 2 with a roughly circular cross-section, a driver's cab 20 and a power unit 30 positioned on the upper surface of the loading platform 10, and a frame 40 (see Figure 2) positioned below the loading platform 10.

[0036] Furthermore, as shown in Figures 1 and 2, the rail-road transport trolley 1 includes a pair of crawlers 50 for traveling on the ground outside the railway track L, a pair of two sets of wheels 60 for traveling on the railway track L, and a pair of wheel lifting mechanisms 70 that switch one set of wheels 60 between a traveling position and a stored position by raising and lowering them, as will be described later.

[0037] In addition, as shown in Figures 1 and 3, the rail-road transport trolley 1 is fixed to the frame 40 at predetermined intervals in the width direction Y, and is equipped with a pair of cargo handling assistance mechanisms 80 that assist in moving the reinforced concrete cage 2 to the platform P (see Figure 7).

[0038] Furthermore, when the rail-road transport trolley 1 travels along the railway track L, even if the height of the loading surface of the loading platform 10 is approximately the same as the floor of the platform P, it is configured to ensure a wider gap between the overhead wire (not shown) located above the railway track L and the reinforced cage 2 than the gap at which power supply interruption is required.

[0039] To describe the rail-road transport trolley 1 in more detail, the loading platform 10, as shown in Figures 1 to 3, consists of a loading platform body 11 with a roughly inverted hat-shaped cross-section that protrudes downward in the vertical cross-section along the width direction Y, and a loading platform frame 12 that supports the loading platform body 11 from below. Furthermore, the loading platform 10 is formed in a roughly rectangular shape in plan view, having a length in the front-to-back direction X that is longer than the axial length of the reinforcing cage 2, and a length in the width direction Y that is narrower than the diameter of the reinforcing cage 2.

[0040] As shown in Figure 3, the cargo bed body 11 is formed in a roughly inverted hat shape in cross-section by a pair of cargo bed ends 13 located outside the width direction Y of the rail L and above the crawler 50 (described later), and a cargo bed groove 14 that connects the cargo bed ends 13 and is recessed below.

[0041] Furthermore, as shown in Figures 1 and 2, a protective frame 15 is provided on the upper surface of the cargo bed body 11, spanning a pair of cargo bed ends 13, between the reinforcing cage 2 and the power unit 30 in the front-rear direction X, to restrict the movement of the reinforcing cage 2 toward the power unit 30.

[0042] More specifically, as shown in Figure 3, the end portion 13 of the loading platform is a substantially flat plate shape with thickness in the vertical direction and an upper surface substantially parallel to the width direction Y, with the end portion on the outside of the width direction Y extending downward. On the other hand, as shown in Figure 3, the recessed groove 14 on the loading platform is formed to accommodate the lower part of the reinforcing cage 2 and to restrict the movement of the reinforcing cage 2 in the width direction Y.

[0043] Specifically, as shown in Figure 3, the cargo bed groove 14 is formed in a substantially inverted trapezoidal cross-section by a pair of inclined portions 14a extending downward from the inside in the width direction Y of the cargo bed end 13 toward the other cargo bed end 13, and a substantially flat bottom portion 14b connecting the lower ends of the inclined portions 14a in the width direction Y.

[0044] Furthermore, as shown in Figures 1 and 3, the cargo bed groove 14 has two roughly rectangular openings 10a that penetrate vertically in a plan view, spaced apart in the width direction Y, at a position separated from the protective frame 15 on one side in the front-rear direction X.

[0045] This opening 10a is an opening through which the guide portion 83 of the cargo handling assistance mechanism 80, which will be described later, extends and retracts. The opening is formed from near the end in the width direction Y of the bottom portion 14b of the cargo bed groove portion 14 to approximately the center in the width direction Y of the inclined portion 14a.

[0046] Furthermore, as shown in Figures 2 and 3, the cargo bed frame 12 of the cargo bed 10 is configured to support the cargo bed body 11 with a pair of columnar members 16 extending in the front-rear direction X at a predetermined distance in the width direction Y, and flat plate members 17 that are arranged at a predetermined distance in the front-rear direction X and fixed to the columnar members 16.

[0047] Furthermore, as shown in Figures 1 and 2, the driver's cab 20 is located on the other side of the upper surface of the cargo bed 10 in the longitudinal direction X, and consists of a seat 21 where the worker sits as an occupant, and an operating device 22 that receives the worker's driving operations for the rail-road transport trolley 1. The seat 21 and the operating device 22 are positioned on the upper surface of the cargo bed end 13, facing each other in the width direction Y.

[0048] Specifically, the control device 22 of the driver's cab 20 has a function to receive operator's driving commands for movement using a pair of crawlers 50, and a function to receive operator's driving commands for movement using a pair of wheels 60. Furthermore, the operating device 22 has the function of receiving operation of the wheel lifting mechanism 70 by the worker, and the function of receiving operation of the cargo handling assistance mechanism 80, which will be described later, by the worker.

[0049] Furthermore, as shown in Figures 1 and 2, the power unit 30 is positioned on the upper surface of the cargo bed 10 between the protective frame 15 and the driver's cab 20. This power unit 30 consists of an engine and generator that supply driving force to the wheels 60 and crawler 50, and a hydraulic unit that supplies hydraulic pressure to the wheel lifting mechanism 70 and the cargo handling assistance mechanism 80.

[0050] Furthermore, as shown in Figures 2 and 3, the support frame 40 is a support member that supports the cargo bed 10 between the columnar members 16 of the cargo bed frame 12, and is composed of a combination of a plurality of flat plates having thickness in the width direction Y and a plurality of flat plates having thickness in the vertical direction.

[0051] Furthermore, the frame 40 is formed with a length in the longitudinal direction X that is shorter than the length in the longitudinal direction X of the crawler 50, which will be described later, and is positioned such that the approximate center of the longitudinal direction X of the cargo bed 10 is offset to one side of the longitudinal direction X.

[0052] Furthermore, as shown in Figure 3, the pair of crawlers 50 face each other with a distance in the width direction Y that is wider than the track width, and are fixed to the side of the frame 40 in the width direction Y. As shown in Figures 1 and 2, the crawler 50 consists of a travel motor 51 that is driven by electricity from the power unit 30, a sprocket (not shown) that is rotated by the travel motor 51, an idler (not shown) spaced apart from the sprocket in the front-rear direction X, and a strip-shaped track 52 that encloses these components as a whole.

[0053] Furthermore, as shown in Figures 2 and 3, each pair of wheels 60 consists of one pair of wheels 60 located on one side of the frame 40 in the longitudinal direction X, and another pair of wheels 60 located on the other side of the frame 40 in the longitudinal direction X. More specifically, the two pairs of wheels 60 are arranged adjacent to the crawler 50 in the front-rear direction X when viewed from the side, as shown in Figure 2.

[0054] These pairs of wheels 60 are positioned opposite each other with a distance in the width direction Y that is approximately the same as the track width, and are connected via an axle (not shown) that is rotatably supported by a wheel lifting mechanism 70 (support arm 72, described later). Although detailed illustrations are omitted, the wheel 60 is configured to be rotationally driven by a driving force from a power unit 30 connected to the axle via, for example, a chain.

[0055] Furthermore, as shown in Figure 4, the pair of wheel lifting mechanisms 70 connect and support the frame 40 and a pair of wheels 60. This wheel lifting mechanism 70 functions as a wheel lifting means for switching the pair of wheels 60 between a travel position and a stored position by lifting and lowering, and as a cargo bed lifting means for raising and lowering the cargo bed 10. The wheel lifting mechanism 70 is configured to raise the loading surface of the cargo bed 10 (the upper surface of the cargo bed end 13) to approximately the same height as the floor surface of the platform P.

[0056] Specifically, the wheel lifting mechanism 70 is configured to allow a pair of wheels 60 to move between a traveling position located below the lower end of the crawler 50 (see Figure 4(a)) and a storage position located above the lower end of the crawler 50 (see Figure 4(b)).

[0057] As shown in Figure 4, the wheel lifting mechanism 70 consists of a pair of actuators 71 and support arms 72 that are pivotally connected to the ends of the frame 40 in the front-rear direction X. The actuator 71 is a hydraulic actuator that extends and retracts by hydraulic pressure from a hydraulic unit built into the power unit 30. As shown in Figure 4, one end is pivotally connected to the upper corner of the frame 40, and the other end is pivotally connected to the vicinity of the wheel 60 on the support arm 72.

[0058] On the other hand, as shown in Figure 4, the support arm 72 is composed of a roughly box-shaped box section 72a positioned between a pair of wheels 60 and rotatably supporting the axle, and a pair of arm bodies 72b extending from the box section 72a in the front-rear direction X and pivotally connected to the lower corners of the frame 40.

[0059] In this configuration, the wheel lifting mechanism 70 allows the wheel 60, which is in the travel position shown in Figure 4(a), to be moved to the stowed position shown in Figure 4(b) by rotating the support arm 72 so that the box section 72a moves upward around the connection point with the frame 40 when the actuator 71 is retracted. In this process, the cargo bed 10 descends in accordance with the transition of the wheels 60 from the travel position to the stowed position.

[0060] Furthermore, the wheel lifting mechanism 70 is configured such that when the actuator 71 is extended, the support arm 72 rotates so that the box section 72a moves downward around the connection point with the frame 40, thereby enabling the wheel 60, which is in the stowed position shown in Figure 4(b), to be moved to the traveling position shown in Figure 4(a). In this process, the cargo bed 10 rises in accordance with the transition of the wheels 60 from their stowed position to their travel position.

[0061] Furthermore, as shown in Figure 3, the pair of cargo handling assistance mechanisms 80 are positioned in the opening 10a of the cargo bed 10 and are configured to independently push up the reinforcing cage 2. As shown in Figure 3, the cargo handling assistance mechanism 80 consists of a jack 81 positioned below the opening 10a of the cargo bed 10, a pivot 82 fixed to the jack 81, and a guide 83 fixed to the pivot 82 and contacting the reinforcing cage 2 from below.

[0062] More specifically, as shown in Figure 3, the jack 81 is a hydraulic jack that extends and retracts by hydraulic pressure from a hydraulic pump built into the power unit 30, with the cylinder 81b fixed to the frame 40 such that the rod 81a is on the upper side. The jack 81 has an extension range that allows the guide portion 83 to extend and retract between a position below the opening 10a and a position above the opening 10a.

[0063] Furthermore, as shown in Figure 5, the pivot portion 82 consists of a lower base portion (not shown in numerals) fixed to the rod 81a of the jack 81, and an upper base portion (not shown in numerals) fixed to the lower surface of the guide portion 83 and pivotally supported by the lower base portion. Furthermore, as shown in Figure 5, the lower base and the upper base are pivotally connected with a rotation axis 82a in the front-rear direction X that passes through a position slightly offset inward in the width direction Y with respect to the axis center of the jack 81.

[0064] Furthermore, the lower base of the pivot portion 82 is formed to function as a rotation restricting portion that restricts the rotation of the guide portion 83 by having the contact portion 83c of the guide portion 83, which will be described later, contact the inner surface in the width direction Y.

[0065] Furthermore, the guide portion 83 is a member that contacts the reinforcing cage 2 from below and guides the movement of the reinforcing cage 2 toward one side in the width direction Y. As shown in Figures 3 and 5, the guide portion 83 has a roughly plate-like cross-sectional shape in a vertical cross-section along the width direction Y, and the upper base of the pivot portion 82 is fixed to its lower surface.

[0066] Furthermore, as shown in Figure 5, the upper surface of the guide portion 83 is formed by an outer upper surface 83a located outward in the width direction Y with respect to the rotation axis 82a of the pivot portion 82, and an inner upper surface 83b located inward in the width direction Y with respect to the rotation axis 82a of the pivot portion 82, and intersecting the outer upper surface 83a.

[0067] In addition, as shown in Figure 5, the guide portion 83 has an inner side in the width direction Y that protrudes downward with respect to the rotation axis 82a of the pivot portion 82, and also has a contact portion 83c that abuts against the lower base of the pivot portion 82 in the width direction Y. This contact portion 83c is formed to contact the lower base when the outer upper surface 83a of the guide portion 83 is in a substantially horizontal position.

[0068] Therefore, the cargo handling assistance mechanism 80 allows the guide unit 83 to rotate such that, when viewed from the power unit 30 side in the front-rear direction X, the outer upper surface 83a is in a substantially horizontal state and points downward around the rotation axis 82a of the pivot unit 82, while the lower base restricts the rotation of the guide unit 83 so that the outer upper surface 83a points upward.

[0069] Next, a transportation method for transporting a large-diameter reinforcing cage 2 from a loading location outside the railway track L to a platform P using the rail-road transport trolley 1 with the above configuration will be explained with reference to Figures 6 to 11. Furthermore, the reinforcing cage 2 will be erected underground beneath platform P with its axial direction oriented vertically, and will be installed in pile holes formed by excavating the ground.

[0070] Furthermore, Figure 6 shows a flowchart illustrating the method of transporting the reinforcing cage 2, Figure 7 shows an explanatory diagram illustrating the preparation process in the cross-sectional view taken along arrow AA, and Figure 8 shows an explanatory diagram illustrating the installation of the first chill wheel 4 and the second chill wheel 5. Furthermore, Figure 9 shows an explanatory diagram illustrating the first unloading process in the direction of arrow AA, and Figures 10 and 11 show explanatory diagrams illustrating the second unloading process in the direction of arrow AA.

[0071] First, as shown in Figure 6, the method for transporting the reinforcing cage 2 involves a loading process in which the reinforcing cage 2, which is the cargo, is loaded onto the rail-road transport trolley 1 at a predetermined loading location outside the railway track L (step S101). Specifically, the worker places the reinforcing cage 2 onto the loading platform 10 of the rail-road transport trolley 1, where two pairs of wheels 60 are located in their storage positions, using heavy machinery or the like.

[0072] In this case, the worker places the reinforcing cage 2 on the loading platform 10 such that its approximate axial center is directly above the jack 81 of the loading assistance mechanism 80, and the lower part of the reinforcing cage 2 fits into the loading platform groove 14. Furthermore, the worker completes the loading process by securing the reinforcing cage 2 to the loading platform 10 using a chain and towing device (not shown in the illustration).

[0073] Once the loading process is complete, the method of transporting the reinforcing cage 2 involves a ground movement process (step S102) in which a worker seated in the seat 21 of the driver's cab 20 operates the rail-road transport trolley 1 to a loading location, such as inside a level crossing with the tracks closed. In this case, since the two pairs of wheels 60 are in the storage position, the rail-road transport trolley 1 moves to the track loading location by self-propulsion using the pair of crawlers 50.

[0074] Once the rail-road transport trolley 1 is moved to the track placement location, the method of transporting the reinforcing cage 2 is as shown in Figure 6, in which the rail-road transport trolley 1 is rotated and placed onto the track L by the operation of a worker seated in the seat 21 of the driver's cab 20 (step S103).

[0075] Specifically, the operator rotates the rail-road transport trolley 1 by the difference in rotation of a pair of crawlers 50 so that the front-rear direction X of the rail-road transport trolley 1 is approximately parallel to the direction of extension of the railway track L, and a pair of wheels 60 are positioned directly above the railway track L.

[0076] Furthermore, the worker extends the actuator 71 of the wheel lifting mechanism 70 to bring the two pairs of wheels 60 into contact with the track L, and lifts the crawler 50 off the ground. In this process, the operator extends the actuator 71 until the height H1 from the track L to the loading surface of the end of the loading platform 13 is approximately equal to the height H2 from the track L to the floor of the platform P, as shown in Figure 7.

[0077] Once the track loading process is complete, the method for transporting the reinforcing cage 2 involves an entry process (step S104) in which a worker seated in the driver's cab 20 operates the rail-road transport trolley 1 to the platform P, as shown in Figure 6. In this case, since the two pairs of wheels 60 are positioned in the running position, the rail-road transport vehicle 1 enters the platform P by self-propulsion using the two pairs of wheels 60.

[0078] When the rail-road transport trolley 1 enters platform P, the transport method for the reinforcing cage 2 involves performing a preparation process for unloading the reinforcing cage 2 from the loading platform 10 onto the floor of platform P (step S105). Specifically, as shown in Figure 7, the worker places the steel plate 3 so as to straddle the floor of the platform P and the top surface of the loading platform 10 of the rail-road transport trolley 1, thereby creating a passage for moving the reinforcing cage 2.

[0079] Furthermore, as shown in Figure 8, the worker connects the first chill wheel 4, which is fixed to the pillar Pa of the platform P, to the reinforcing cage 2 via a chain, and also connects the second chill wheel 5, which is fixed to the adjacent track L, to the reinforcing cage 2 via a chain. Afterward, the workers complete the preparation process by removing the chains and towing equipment that secure the reinforcing cage 2 to the loading platform 10.

[0080] Once the preparation process is complete, the method for transporting the reinforcing cage 2 involves a first unloading process (step S106) in which the reinforcing cage 2 is moved by pulling with the first chill wheel 4 and pushing up with one of the cargo handling assisting mechanisms 80, as shown in Figure 6.

[0081] To simplify the following explanation, we will define the direction of movement Ya of the reinforcing cage 2 as the direction from the loading platform 10 of the rail-road transport trolley 1 toward the platform P in the width direction Y. In other words, the direction toward the platform P in the track width direction is defined as the direction of movement Ya.

[0082] Specifically, one of the two workers operates the second chill wheel 5 fixed to the track L to loosen the tension of the chain, while the other worker operates the first chill wheel 4 fixed to the platform P to pull the reinforcing cage 2, thereby applying a tensile load in the direction of movement Ya to the reinforcing cage 2.

[0083] Furthermore, as shown in Figure 9, the worker seated in the driver's cab 20 operates the control device 22 to extend the jack 81 of the cargo handling assistance mechanism 80 that is furthest from the platform P. In this case, since the radial center of the reinforcing cage 2 is located closer to the platform P than one of the cargo handling assistance mechanisms 80, the inner upper surface 83b of the guide section 83 of one of the cargo handling assistance mechanisms 80 will be in contact with the reinforcing cage 2, as shown in Figure 9.

[0084] As a result, the reinforcing cage 2 is pushed upward as the jack 81 of the cargo handling assistance mechanism 80 extends, and is pressed in the direction of movement Ya by the inclination of the inner upper surface 83b of the guide section 83. Therefore, the reinforcing cage 2 begins to move by rolling in the direction of movement Ya due to the pulling force from the first chill wheel 4 and the upward push from one of the cargo handling assistance mechanisms 80.

[0085] Subsequently, the worker moves the reinforcing cage 2 in the direction of movement Ya by pulling with the first chill wheel 4 and pushing up with one of the cargo handling assistance mechanisms 80 until the radial center of the reinforcing cage 2 is located near the other cargo handling assistance mechanism 80, which is closer to the platform P.

[0086] When the reinforcing cage 2 moves to near the area directly above the other cargo handling assistance mechanism 80, the transport method for the reinforcing cage 2 involves a second unloading process (step S107) in which the reinforcing cage 2 is moved by pulling with the first chill wheel 4 and pushing up with the other cargo handling assistance mechanism 80, as shown in Figure 6. Specifically, by having a worker operating the first chill wheel 4 fixed to the platform P and a worker operating the second chill wheel 5 fixed to the track L operate the first chill wheel 4 and the second chill wheel 5 almost simultaneously, a tensile load directed in the direction of movement Ya is applied to the reinforcing cage 2.

[0087] Furthermore, as shown in Figure 10, the worker seated in the seat 21 of the driver's cab 20 operates the control device 22 to extend the jack 81 of the other cargo handling assistance mechanism 80 that is closer to the platform P. In this case, since the radial center of the reinforcing cage 2 is located on the platform P side than the rotation axis 82a of the pivot part 82 in the other cargo handling assistance mechanism 80, the other cargo handling assistance mechanism 80 starts to rotate around the rotation axis 82a, pushing up the reinforcing cage 2 as shown in Figure 11, so that the outer upper surface 83a faces the direction of movement Ya.

[0088] As a result, the reinforcing cage 2 is pushed upward as the jack 81 of the cargo handling assistance mechanism 80 extends, while the rotation of the guide unit 83 guides its movement in the direction of movement Ya. Therefore, the reinforcing cage 2 is further propelled to move in the direction of movement Ya by the pulling force from the first chill wheel 4 and the pushing force from the other cargo handling assistance mechanism 80.

[0089] After the process described above, the reinforcing cage 2 escapes from the groove 14 of the loading platform 10 and moves to the upper surface of the loading platform end 13, as shown in Figure 11. Subsequently, the worker moves the reinforcing cage 2 to the platform P floor by pulling it with the first chill wheel 4.

[0090] Through the cooperation of the two cargo handling assistance mechanisms 80 and the first chill wheel 4, the reinforcing cage 2 is moved to the floor surface of the platform P. Then, as shown in Figure 6, the method of transporting the reinforcing cage 2 involves the operator lowering the cargo handling assistance mechanisms 80 by operating the operating device 22, and performing a subsequent process (step S108) to remove the steel plates 3, etc., to complete all transport operations.

[0091] In this way, the rail-road transport trolley 1 loads the reinforcing cage 2 into the groove 14 of the loading platform 10, and assists in moving the reinforcing cage 2 to the platform P with a pair of cargo handling assistance mechanisms 80, thereby enabling the transport of the large-diameter reinforcing cage 2 onto the platform P floor without interrupting the power supply.

[0092] As described above, the rail-road transport trolley 1 of this embodiment is equipped with a loading platform 10 for loading a reinforcing cage 2 with a substantially circular cross-section that extends in the direction of extension of the rail L (the front-rear direction X of the rail-road transport trolley 1), at least one pair of two sets of wheels 60 for running on the rail L, and a wheel driving means (power unit 30) for driving the wheels 60.

[0093] Furthermore, the rail-road transport trolley 1 is equipped with at least one pair of crawlers 50 for traveling on the ground outside the railway track L, and a wheel lifting mechanism 70 that switches the wheels 60 between a traveling position and a stowed position located above the lower end of the crawlers 50 by raising and lowering them.

[0094] Furthermore, the pair of crawlers 50 are arranged at predetermined intervals in the track width direction (width direction Y of the rail-road transport trolley 1), which is approximately perpendicular to the extension direction in a plan view. Furthermore, the cargo bed 10 is provided with a roughly concave groove portion 14 that extends in the extension direction between the pair of crawlers 50.

[0095] With this configuration, since the vehicle travels on the ground outside the railway track L using a pair of crawlers 50, a suspension system and the like are unnecessary compared to, for example, a rail-road transport vehicle that travels on the ground outside the railway track L using tires, thus allowing the height of the loading surface of the cargo bed 10 to be kept low.

[0096] Furthermore, the groove 14 on the loading platform 10 allows the rail-road transport trolley 1 to load the reinforcing cage 2 such that a portion of its substantially circular cross-section fits into the groove 14. As a result, the rail-road transport trolley 1 can keep the overall height of the reinforcing cage 2 loaded with a substantially circular cross-section lower compared to when the reinforcing cage 2 with a substantially circular cross-section is loaded onto a loading platform with a substantially flat loading surface.

[0097] As a result, the rail-road transport trolley 1 can ensure a wider gap between the large-diameter reinforcing cage 2 and the overhead wires above the railway track L compared to when the large-diameter reinforcing cage 2 is loaded onto a loading platform with a nearly flat surface. Therefore, the rail-road transport trolley 1 can travel on the railway tracks L without stopping the power supply and transport the large-diameter reinforcing cage 2, thereby reducing the man-hours and cost increases required for transporting the reinforcing cage 2. In addition, the rail-road transport trolley 1 can keep its center of gravity low when loaded with a large-diameter reinforcing cage 2, allowing for the safe and stable transport of the large-diameter reinforcing cage 2.

[0098] Furthermore, the wheel lifting mechanism 70 is pivotally connected to the frame 40 that supports the loading platform 10, and is equipped with a support arm 72 that supports the wheels 60, and an extendable actuator 71, one end of which is connected to the frame 40 and the other end of which is connected to the support arm 72.

[0099] With this configuration, the extension and retraction of the actuator 71 causes the support arm 72 to rotate clockwise or counterclockwise around the connection point with the frame 40, thereby raising and lowering the wheel 60. This allows the wheel 60 to be raised and lowered between the travel position and the storage position with a simple configuration. As a result, even if the wheel lifting mechanism 70 is positioned below the loading platform 10, the overall height of the rail-road transport trolley 1 in the loaded state can be kept to a minimum.

[0100] Furthermore, the wheel lifting mechanism 70 is configured to raise and lower the cargo bed 10 by extending and retracting the actuator 71 when the wheels 60 are in the travel position. This configuration eliminates the need to separately provide a lifting mechanism for the cargo bed below the cargo bed 10, thus allowing for a further reduction in the overall height when loaded.

[0101] Furthermore, the rail-road transport trolley 1 can easily adjust the height H1 of the loading surface of the loading platform 10 to match the height H2 of the platform P without requiring a separate means for raising and lowering the loading platform, thus facilitating the transfer of the reinforcing cage 2 from the loading platform 10 to the platform P.

[0102] Furthermore, since the loading and unloading assistance mechanism 80 is provided to push upward the reinforcing cage 2, which has a roughly circular cross-section and is loaded on the loading platform 10, the rail-road transport trolley 1 can make it easier to remove the reinforcing cage 2 from the loading platform groove 14 compared to when the reinforcing cage 2 is pulled in the direction of movement Ya by the first chill wheel 4 to remove it from the loading platform groove 14. As a result, the rail-road transport trolley 1 can reduce the burden on workers who move the reinforcing cage 2 on the loading platform 10, and can also reduce the man-hours required to transport the reinforcing cage 2.

[0103] Furthermore, the cargo handling assistance mechanism 80 is configured to consist of two opposing units arranged in the direction of the track width (the width direction Y of the rail-road transport trolley 1), each independently pushing up the reinforcing cage 2. With this configuration, the two cargo handling assistance mechanisms 80 start operating at different timings, which allows the reinforcing cage 2 to be guided toward the direction of movement Ya while being pushed upward.

[0104] This allows the rail-road transport trolley 1 to easily move the reinforcing cage 2 in the direction of movement Ya, thereby further reducing the burden on the worker moving the reinforcing cage 2 on the loading platform 10.

[0105] Furthermore, since the cargo handling assistance mechanism 80 is provided with a guide unit 83 that guides the reinforcing cage 2 toward the direction of movement Ya, the rail-road transport trolley 1 can guide the reinforcing cage 2 toward the direction of movement Ya while escaping from the recessed groove 14 of the loading platform. As a result, when the rail-road transport trolley 1 transfers the reinforcing cage 2 on the platform 10 to the platform P, the movement of the reinforcing cage 2 from the platform 10 towards the platform P becomes even easier.

[0106] Furthermore, since the guide unit 83 is configured to guide the reinforcing cage 2 toward the direction of movement Ya by rotating with the front-rear direction X as the axis of rotation, the rail-road transport trolley 1 can guide the reinforcing cage 2, which has a substantially circular cross-section, to roll toward the direction of movement Ya.

[0107] As a result, the rail-road transport trolley 1 makes it easier for the reinforcing cage 2 to escape from the grooved section 14 of the loading platform, thereby reducing the man-hours required to transport the reinforcing cage 2 and easing the burden on workers who move the reinforcing cage 2 on the loading platform 10.

[0108] Furthermore, the guide unit 83 is configured to extend and retract through an opening 10a provided in the recessed groove 14 of the cargo bed. With this configuration, the guide section 83 can be shaped not as part of the cargo bed groove section 14, but as an appropriate shape suitable for guiding the reinforcing cage 2. As a result, the rail-mounted transport trolley 1 can guide the reinforcing cage 2 more efficiently, thereby reducing the burden on the workers who move the reinforcing cage 2 on the loading platform 10.

[0109] Furthermore, the pair of crawlers 50 are positioned outside the width direction Y of the pair of wheels 60 and the wheel lifting mechanism 70. With this configuration, the length in the width direction Y and the length in the vertical direction (depth of the groove 14) of the cargo bed 10 can be secured, so the overall height when a large-diameter reinforcing cage 2 is loaded can be reliably kept low.

[0110] Furthermore, the rail-road transport trolley 1 is equipped with a seat 21 in which the crew sits, and an operating device 22 that accepts driving operations by the crew for traveling on the rails L, and driving operations by the crew for traveling on the ground outside the rails L.

[0111] With this configuration, the vehicle can move under its own power without being towed on the railway track L or on the ground outside of the track L, thus facilitating movement on the railway track L and on the ground outside of the track L. This allows the mobile transport trolley to improve the transport efficiency of the reinforcing cage 2.

[0112] In the correspondence between the structure of this invention and the embodiments described above, The load of this invention corresponds to the reinforcing cage 2 of the embodiment, The same applies to the following: The wheel drive means corresponds to the power unit 30, The wheel lifting mechanism corresponds to the wheel lifting mechanism section 70, One side in the direction of track width corresponds to the direction of movement Ya, The driving operation means corresponds to the operating device 22, This invention is not limited to the configuration of the embodiments described above, and many other embodiments can be obtained.

[0113] For example, in the above embodiment, the reinforcing cage 2 was described as the cargo, but it is not limited to this. Any cargo with a substantially circular cross-section that extends in the front-to-back direction X may be used as cargo, such as cylindrical members or columnar members. Alternatively, it may be cargo with a substantially rectangular cross-section that is narrower than the length in the width direction Y of the cargo bed groove 14 and extends in the front-to-back direction X.

[0114] Furthermore, although the recessed groove portion 14 of the cargo bed 10 is shown to have a roughly inverted trapezoidal cross-section, it is not limited to this, and the recessed groove portion of the cargo bed may have a roughly rectangular cross-section, or a roughly semicircular cross-section, etc. Furthermore, the driver's cab 20 and power unit 30 are not limited to the embodiments described above, and may be driver's cab 20 and power unit 30 of an appropriate shape and layout.

[0115] Furthermore, although the rail-road transport trolley 1 is described as having a pair of crawlers 50 and two pairs of wheels 60, this is merely an example and is not limited to this. A rail-road transport trolley with multiple pairs of crawlers 50, a rail-road transport trolley with three or more pairs of wheels 60, etc., may also be used.

[0116] Furthermore, although the configuration is shown to include a pair of cargo handling assistance mechanisms 80, it is not limited to this configuration. For example, a rail-road transport trolley may be provided with multiple pairs of cargo handling assistance mechanisms 80 facing each other in the width direction Y, spaced at predetermined intervals in the front-rear direction X.

[0117] Furthermore, although the jack 81 of the cargo handling assistance mechanism 80 is configured as a hydraulic jack, it is not limited to this, and the jack 81 may be configured as a pantograph jack that moves up and down by a hydraulic jack that extends and retracts in the front-rear direction X.

[0118] Furthermore, although the pivot part 82 of the cargo handling assistance mechanism 80 is configured to have a rotating shaft 82a at a position slightly offset inward in the width direction Y with respect to the axis of the jack 81, the pivot part 82 may have a rotating shaft 82a on the extension of the axis of the jack 81.

[0119] Furthermore, although the guide section 83 of the cargo handling assistance mechanism 80 is configured to be pivotably connected to the jack 81, the configuration is not limited to this, and the cargo handling assistance mechanism 80 may also have a guide section 83 that is fixed to the jack 81.

[0120] Furthermore, the cargo handling assistance mechanism 80 is not limited to the embodiment described above, and may be configured in any way that at least pushes the reinforcing cage 2 upwards. For example, a single cargo handling assistance mechanism may consist of a jack fixed approximately in the center of the width direction Y of the frame 40, and a flat plate portion fixed to the upper end of the jack and in contact with the reinforcing cage 2 from below.

[0121] Furthermore, although the guide portion 83 of the cargo handling assistance mechanism 80 is configured to extend and retract from the opening 10a of the cargo bed 10, this is just one example and is not limited to this configuration. For example, as shown in Figure 12, which shows a cross-sectional view of the rail-road transport trolley 1 in the direction of arrow AA in another embodiment, the guide portion 84 of one of the two cargo handling assistance mechanism 80, which is spaced apart from the platform P, may be formed with a cross-sectional shape having an upper surface that is continuous with the upper surface of the inclined portion 14a and the upper surface of the bottom portion 14b of the cargo bed groove 14.

[0122] With this configuration, when the guide unit 84 pushes up the reinforcing cage 2, the inclined surface of the guide unit 84, which is continuous with the inclined portion 14a of the loading platform groove 14, can guide the reinforcing cage 2 toward the direction of movement Ya. Therefore, the rail-road transport trolley 1 can achieve the same effects as in the above-described embodiment.

[0123] Furthermore, since the guide section 84 constitutes part of the loading platform groove section 14, the rail-road transport trolley 1 can suppress the unevenness of the loading platform groove section 14. As a result, the rail-road transport trolley 1 can load the reinforcing cage 2 in a stable state, and thus large-diameter reinforcing cages 2 can be transported more safely.

[0124] Furthermore, although the train traveled on the tracks L with the height H1 of the cargo bed 10 approximately equal to the height H2 of the platform P, it is not limited to this, and it may travel at a height lower than the height H2 of the platform P. In this case, after entering the platform P, the height H1 of the cargo bed 10 is raised to the height H2 of the platform P by extending the actuator 71 of the wheel lifting mechanism 70. This configuration allows the center of gravity to be kept low during transport, making it possible to transport the large-diameter reinforcing cage 2 more safely.

[0125] Furthermore, the operating timing of the pair of cargo handling assistance mechanisms 80 is not limited to the embodiment described above, and may be any appropriate operating timing as long as it is possible to guide the reinforcing cage 2 toward the direction of movement Ya while pushing it upward. For example, while one cargo handling assistance mechanism 80 is extending, the other cargo handling assistance mechanism 80 may start extending, or the two cargo handling assistance mechanisms 80 may start operating at different operating speeds.

[0126] Furthermore, the method of transporting the reinforcing cage 2 is not limited to the embodiment described above. For example, a rail-road transport trolley 1 loaded with the reinforcing cage 2 may travel along the rail L to a predetermined loading location, and after arriving at the predetermined loading location, it may travel on the ground outside the rail L using the crawler 50 to switch to another rail L, and then transport the reinforcing cage 2 to the platform P by traveling along the rail L. Furthermore, although the reinforcing cage 2 was transported to platform P, the destination of the reinforcing cage 2 may be any suitable destination adjacent to the railway track L. [Explanation of symbols]

[0127] 1… Rail-road transport trolley 2…Reinforcement cage 10...Cargo bed 14…Depressed groove in the cargo bed 21… Seats 22...Operating device 30… Power Unit 40… Mounting frame 50... Crawler 60...Wheel 70...Wheel lifting mechanism 71… Actuator 72...Support arm 80...Cargo handling support mechanism section 83,84...guiding section L…Railway Ya... Direction of movement

Claims

1. A loading platform for cargo that extends in the direction of the railway line's extension, At least one pair of two sets of wheels for running on the aforementioned tracks, A wheel drive means for driving the wheel, At least one pair of crawlers for traveling on the ground outside the aforementioned railway tracks, The system is equipped with a wheel lifting mechanism that switches the wheel between a running position and a stowed position located above the lower end of the crawler by raising and lowering it. The pair of crawlers are They are arranged at predetermined intervals in the track width direction which is substantially perpendicular to the extension direction in a plan view, The aforementioned cargo bed is A substantially concave groove is provided between the pair of crawlers, extending in the direction of extension. Rail-road transport trolley.

2. The wheel lifting means is The support arms are pivotally connected to the frame that supports the cargo bed and support the wheels, It is equipped with an extendable actuator, one end of which is connected to the frame and the other end of which is connected to the support arm. The rail-road transport trolley according to claim 1.

3. The wheel lifting means is With the wheels in the aforementioned driving position, the cargo bed is configured to be able to be raised and lowered by the extension and retraction of the actuator. The rail-road transport trolley according to claim 2.

4. A cargo handling assistance mechanism is provided to push upward the cargo, which has a roughly circular cross-section, loaded onto the cargo bed. The rail-road transport trolley according to claim 1.

5. The aforementioned cargo handling assistance mechanism is The two units are arranged opposite each other in the direction of the track width, and each is configured to independently push up the load. The rail-road transport trolley according to claim 4.

6. The aforementioned cargo handling assistance mechanism is A guide unit is provided to guide the aforementioned load toward one side in the direction of the track width. The rail-road transport trolley according to claim 4.

7. The aforementioned induction unit is The configuration is such that the load is guided toward one side in the direction of the track width by rotation with the extension direction as the axis of rotation. The rail-road transport trolley according to claim 6.

8. The aforementioned induction unit is The structure allows the device to retract and retract through an opening provided in the groove of the cargo bed. The rail-road transport trolley according to claim 6.

9. The guide portion is formed from a part of the groove portion of the cargo bed. The rail-road transport trolley according to claim 6.

10. The pair of crawlers are positioned outside the track width direction of the pair of wheels and the wheel lifting mechanism. The rail-road transport trolley according to claim 1.

11. The seats where the crew sits, The vehicle is equipped with a driving operation means that accepts driving operations performed by the crew on the railway tracks and driving operations performed by the crew on the ground outside the railway tracks. The rail-road transport trolley according to claim 1.

Images