JP2019131051A - Pipe transport carriage - Google Patents

Abstract

To provide a pipe transport carriage that can perform a lift down work for a pipe while straddling across an excavated groove by an easy procedure.SOLUTION: A pipe transport carriage (1) includes a slide bar (33) for moving traverse wheels (31, 32) for the pipe transport carriage in a direction crossing with an extending direction of a pipe while exceeding a first grounding range that is a range surrounded by grounding points related to respective multiple running wheels (21 to 24).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe transport carriage for transporting a pipe material such as an iron pipe.

  Patent Documents 1 and 2 disclose a pipe transport carriage (long rigid material transport device, pipe unloading transport vehicle for piping) for transporting pipe materials and the like.

JP 2004-284543 A (published on October 14, 2004) Japanese Utility Model Publication No. 62-58258 (published April 10, 1987)

  The pipe conveyed by the pipe conveyance carriage is suspended, for example, in an excavation groove. At this time, it is necessary to make the pipe transport carriage straddle the excavation groove. In the pipe transport carriage described in Patent Documents 1 and 2, in order to cross the excavation groove, the pipe conveyance carriage is in a state of straddling the cut groove, or the excavation groove is covered with the lid. It is necessary to cross the excavation groove on the top.

  However, in the case where the pipe transport carriage crosses the excavation groove at the cut of the excavation groove, the pipe transport carriage needs to travel along the excavation groove to a position where the pipe is suspended in this state. In this case, there is a safety problem because an operator who transports the pipe using the pipe transport carriage needs to work in a state of straddling the excavation groove.

  Also, when the excavation groove is covered and the excavation groove is straddled over the lid, the lid needs to be transported separately, and when the pipe is suspended, the lid needs to be removed. , It takes extra work for the operator.

  An object of one embodiment of the present invention is to realize a pipe transport carriage that can perform a pipe hanging operation in a state where the excavation groove is straddled by an easy procedure.

  In order to solve the above-described problem, a tube transport carriage according to one aspect of the present invention is a tube transport cart for hanging and transporting a tube, and relates to each of a plurality of traveling wheels according to the tube transport cart. A moving mechanism is provided that moves the auxiliary grounding part of the pipe transport carriage in a direction that intersects the extending direction of the pipe beyond the first grounding range that is surrounded by the grounding point.

  According to said structure, a pipe conveyance trolley | bogie can drive | work by the 1st earthing | grounding range which is the range enclosed by the grounding point which concerns on each of several driving wheels. Further, the tube transport carriage includes a moving mechanism, and the moving ground mechanism can move the auxiliary grounding portion to a position beyond the first grounding range. Therefore, an operator who works using the pipe transport carriage can easily cross the excavation groove with the pipe transport carriage only by installing the auxiliary grounding part at a position exceeding the first grounding range and straddling the excavation groove. Can be. In this state, it is possible to perform the work of hanging the pipe.

  In addition, the pipe transport cart according to one aspect of the present invention includes a grounding point related to a grounded one of the plurality of traveling wheels and a contact related to the auxiliary grounding part in a state where the auxiliary grounding part is moved. Due to the second grounding range, which is a range defined by the point, it is possible to travel in a direction crossing the extending direction of the pipe.

  According to said structure, the 2nd earthing | grounding range is prescribed | regulated by the earthing | grounding point which concerns on each of the traveling wheel and the auxiliary earthing | grounding site | part which are earth | grounded. Here, at least a part of the second grounding range exceeds the first grounding range. Therefore, for example, even if a traveling wheel that defines the first grounding range cannot travel in a direction that intersects with the pipe extending direction, the traveling wheel and auxiliary grounding part that defines the second grounding range travel in that direction. be able to.

  Further, in the pipe transport carriage according to one aspect of the present invention, in the state where the auxiliary grounding part is moved, the grounding point relating to the grounded one of the plurality of traveling wheels and the auxiliary grounding part are related. By maintaining the posture of the tube transport carriage so as to be able to travel by the ground contact point, it is possible to travel in a direction crossing the extending direction of the tube.

  According to said structure, the attitude | position of a pipe conveyance trolley is maintained so that driving | running | working is possible by the grounding point which concerns on each of the traveling wheel and auxiliary | assistant grounding site | part which are earth | grounded. Therefore, the tube transport carriage can travel in the direction intersecting with the extending direction of the tube even when there is an ungrounded one of the plurality of traveling wheels.

  Moreover, the pipe conveyance trolley | bogie which concerns on 1 aspect of this invention WHEREIN: The said moving mechanism is a slide bar which slide-moves the said auxiliary | assistant grounding site | part.

  According to said structure, a moving mechanism moves an auxiliary | assistant grounding site | part with the attitude | position with respect to the ground kept constant. Therefore, the auxiliary grounding part functions as an auxiliary grounding part even in the process of movement by the moving mechanism.

  Moreover, in the tube transport carriage according to one aspect of the present invention, the slide bar can be folded.

  According to said structure, a possibility that a slide bar may contact a surrounding object at the time of driving | running | working of a pipe conveyance trolley is reduced.

  In addition, in the tube transport carriage according to an aspect of the present invention, at least one of the plurality of traveling wheels can change the traveling direction, and can be fixed at the changed position.

  According to said structure, the state which conveys a pipe | tube and the case where it straddles a excavation groove can be switched appropriately by changing and fixing the advancing direction of a running wheel.

  Moreover, the pipe conveyance trolley | bogie which concerns on 1 aspect of this invention WHEREIN: The said auxiliary | assistant grounding site | part is a wheel which can change a traveling direction.

  According to said structure, when the auxiliary | assistant grounding site | part is earth | grounded, the extending | stretching direction of the pipe | tube which the pipe conveyance trolley is conveying can be changed by changing the traveling direction of an auxiliary grounding site | part.

  Moreover, the pipe conveyance trolley | bogie which concerns on 1 aspect of this invention can adjust the position of the said auxiliary | assistant grounding site | part up and down.

  According to said structure, according to the degree of the unevenness | corrugation of a road surface, the position of an auxiliary | assistant grounding site | part can be made into the position which does not contact the said unevenness | corrugation and is not too high.

  According to one aspect of the present invention, it is possible to realize a pipe transport carriage capable of performing a pipe hanging operation in a state where the excavation groove is straddled by an easy procedure.

It is a perspective view of the pipe conveyance cart of Embodiment 1. (A)-(f) is a figure for demonstrating in order about the method of straddling an excavation groove on the pipe conveyance trolley | bogie of Embodiment 1. FIG. (A) is a figure which shows the 1st earthing | grounding range in the pipe conveyance trolley | bogie of Embodiment 1, (b) is a figure which shows the 2nd earthing | grounding range in the pipe conveyance trolley of Embodiment 1. FIG. It is a figure for demonstrating another method of straddling a digging groove on the pipe conveyance trolley | bogie of Embodiment 1. FIG. It is a figure explaining the adjustment method of the hanging position of a pipe | tube by the pipe conveyance trolley | bogie of Embodiment 1. FIG.

[Embodiment 1]
Hereinafter, an embodiment of the present invention will be described in detail.

(Configuration of the tube transport carriage 1)
FIG. 1 is a diagram showing a configuration of a tube transport carriage 1 according to the present embodiment. As shown in FIG. 1, the pipe transport cart 1 includes a vehicle body 10, a plurality of traveling wheels 21 to 24, crossing wheels 31 and 32 (auxiliary ground contact parts), and a slide bar 33 (moving mechanism). The auxiliary ground contact portion is a portion that is brought into contact with the ground in order to stably maintain the posture of the tube transport carriage 1 during work, and is a portion that assists the traveling wheels 21 to 24 that are main ground contact portions. Although the pipe conveyance cart 1 includes the crossing wheels 31 and 32 as auxiliary ground contact portions, the auxiliary ground contact portion may be realized by other members such as a column connected to the main body of the pipe conveyance cart 1.

  The vehicle body 10 is a main body portion of the pipe conveyance carriage 1. The vehicle body 10 includes a clamp device 11 that clamps the tube 100 (see FIG. 2), a wire 12 that suspends the clamp device 11, and a winding mechanism 13 that winds the wire 12. In addition, the vehicle body 10 has a handle 14 for an operator to push the tube transport carriage 1 to travel.

  As will be described later, the traveling wheels 21 to 24 are grounded at the grounding points 21a to 24a (see FIG. 3A), respectively, and a first grounding range R1 (see FIG. 3) that is surrounded by the grounding points 21a to 24a. 3 (see (a)). When the tube transport carriage 1 travels, the traveling wheels 21 to 24 rotate. The pipe 100 is conveyed in a state of being arranged between the traveling wheels 21 and 22 and between the traveling wheels 23 and 24.

  The traveling wheels 21 and 22 function as front wheels in the process of transporting the pipe 100 by the pipe transport carriage 1. In the present embodiment, the traveling wheels 21 and 22 can change the traveling direction to either a direction parallel to or perpendicular to the pipe 100 to be transported, and can be fixed in the changed state. In the present embodiment, when the tube 100 is transported, the traveling wheels 21 and 22 are fixed in a state in which the direction of the traveling wheels 21 and 22 is changed in a direction parallel to the extending direction of the tube 100. . On the other hand, when straddling the excavation groove 200 (see FIG. 2) where the pipe 100 is installed, the traveling wheels 21 and 22 are fixed in a direction perpendicular to the extending direction of the pipe 100. As described above, in the pipe transport cart 1, the traveling direction of the traveling wheels 21 and 22 is changed and fixed, so that the state of transporting the pipe 100 and the case of straddling the excavation groove 200 can be appropriately switched. . Note that in the tube transport carriage 1, traveling wheels other than the traveling wheels 21 and 22 may be able to fix the direction with respect to the vehicle body 10. Further, the direction in which the traveling wheels are fixed is not necessarily limited to either the direction parallel to the vehicle body 10 or the vertical direction.

  On the other hand, the traveling wheels 23 and 24 function as rear wheels in the process of transporting the pipe 100 by the pipe transport carriage 1. In the present embodiment, the traveling wheels 23 and 24 are universal wheels that can freely change the direction with respect to the vehicle body 10. For this reason, when the tube transport carriage 1 is traveled in a direction intersecting with the extending direction of the tube 100, it is possible to travel in that direction only by changing the direction of the traveling wheels 21 and 22 and fixing them.

  In the present embodiment, the traveling wheels 23 and 24 are smaller than the traveling wheels 21 and 22. However, the magnitude relationship between the traveling wheels 21 and 22 and the traveling wheels 23 and 24 is not limited to this.

  The traveling wheels 23 and 24 are preferably provided with a stopper for switching between a rotatable state and a non-rotatable state. If the traveling wheels 23 and 24 are provided with stoppers, the operator can move the tube transport carriage 1 to a desired position by the handle 14 and immediately operate the stopper to fix the tube transport carriage 1. Can do.

  The cross wheels 31 and 32 are wheels positioned above a plane including the first ground contact range R1 when the tube transport carriage 1 is grounded by the traveling wheels 21 to 24. For this reason, when the traveling wheels 21 to 24 are all in contact with a flat surface, the cross wheels 31 and 32 are not grounded. With this configuration, it is possible to prevent the cross wheels 31 and 32 from adversely affecting the movement of the pipe transport carriage 1. In addition, when all the traveling wheels 21 to 24 are grounded, the configuration in which the crossing wheels 31 and 32 are grounded is also included in the technical scope of the present embodiment.

  In the present embodiment, the transverse wheels 31 and 32 are wheels that can change the traveling direction. For this reason, when the cross wheels 31 and 32 are grounded, the extending direction of the pipe 100 transported by the pipe transport carriage 1 can be appropriately adjusted. However, the cross wheels 31 and 32 may be fixed wheels whose directions with respect to the vehicle body 10 are fixed.

  The slide bar 33 is a moving mechanism for moving the cross wheels 31 and 32 beyond the first grounding range R1 in a direction intersecting the extending direction of the tube 100. The cross wheels 31 and 32 are attached to the slide bar 33. The slide bar 33 is guided by the guide 34 and slides in the direction intersecting the extending direction of the pipe 100 with respect to the vehicle body 10, thereby slidingly moving the cross wheels 31 and 32 in this direction. In the example shown in FIG. 1, the slide bar 33 moves the cross wheels 31 and 32 in the direction from the traveling wheels 22 and 24 toward the traveling wheels 21 and 23.

  Each of the cross wheels 31 and 32 can be adjusted up and down with respect to the ground. Specifically, for example, screw grooves are formed in the columns 31b and 32b that support the cross wheels 31 and 32, respectively, and the screw grooves are configured to be screwed into screw holes formed in the slide bar 33. Just do it. The positions of the cross wheels 31 and 32 are preferably adjusted to be, for example, 5 cm higher than the plane including the first ground contact range R1. In this case, when the pipe conveyance carriage 1 is caused to travel by the traveling wheels 21 to 24, the possibility that the traveling will be hindered due to the contact of the cross wheels 31 and 32 with the unevenness of the ground is reduced. The positions of the cross wheels 31 and 32 are not limited to this.

  Further, in the tube transport carriage 1, the slide bar 33 can be folded. For this reason, the possibility of the slide bar 33 coming into contact with surrounding objects is reduced by folding the slide bar 33 when the tube transport carriage 1 is traveling. However, for example, when it is assumed that the tube transport carriage 1 is used in a sufficiently wide place where it is not necessary to consider contact with surrounding objects, the slide bar 33 may not be foldable. .

  In addition, not only when the traveling wheels 21 and 23 are not in a grounded state, but when the transverse wheels 31 and 32 are grounded, the traveling wheels 21 to 24 that are grounded and the transverse wheels 31 are not grounded. And 32 define a grounding range different from the first grounding range R1. And the pipe conveyance trolley | bogie 1 can drive | work to the direction which cross | intersects the extending | stretching direction of the pipe | tube 100 by the traveling wheel and crossing wheel which prescribe | regulate the said grounding range.

(Method of straddling the excavation groove 200 on the pipe carrier 1)
(A)-(f) of Drawing 2 is a figure for explaining in order about the method of straddling excavation groove 200 on pipe conveyance cart 1. The excavation groove 200 is a groove in which the pipe 100 conveyed by the pipe conveyance carriage 1 is suspended and arranged. 2A to 2F, the traveling wheels 23 and 24 and the crossing wheel 32 are not shown because they are hidden behind the traveling wheels 21 and 22 and the crossing wheel 31, respectively. With reference to (a)-(f) of FIG. 2, the method of straddling the excavation groove 200 on the pipe conveyance carriage 1 is demonstrated. In addition, since the well-known method may be used about the method of lifting the pipe | tube 100 with the pipe conveyance trolley | bogie 1, and the method of hanging down, description is abbreviate | omitted in this specification.

  First, as shown in (a) of FIG. 2, the pipe carrier 1 with the pipe 100 lifted is run to the side of the excavation groove 200. At this time, the traveling wheel 21 is closer to the excavation groove 200 than the traveling wheel 23, and the traveling wheel 22 is closer to the excavation groove 200 than the traveling wheel 24. The directions of the traveling wheels 21 and 22 are fixed in a direction parallel to the excavation groove 200. The slide bar 33 is in a folded state.

  Next, as shown in FIG. 2B, the direction of the traveling wheels 21 and 22 is changed to a direction perpendicular to the excavation groove 200 and fixed. Subsequently, as shown in FIG. 2C, the slide bar 33 is extended. Further, as shown in FIG. 2D, the cross bars 31 and 32 are moved to the opposite side of the vehicle body 10 with respect to the excavation groove 200 by sliding the slide bar 33 with respect to the vehicle body 10.

  When the pipe carrier 1 is moved toward the excavation groove 200 with the crossing wheels 31 and 32 being moved, the traveling wheel 21 is not grounded at the position of the excavation groove 200 as shown in FIG. It becomes a state. Similarly, the traveling wheels 23 are not grounded. At this time, the second grounding range R2 is defined by the traveling wheels 22 and 24 and the crossing wheels 31 and 32. The pipe conveyance carriage 1 travels in a direction perpendicular to the excavation groove 200 by the second grounding range R2.

  When the tube transport carriage 1 is further traveled from the state shown in FIG. 2 (e), the travel wheels 21 and 23 come into contact with the edge of the excavation groove 200. However, when the operator pushes the pipe transport carriage 1 in a direction perpendicular to the excavation groove 200, the traveling wheels 21 and 23 ride on the edge of the excavation groove 200 as shown in FIG. Thereby, the pipe conveyance cart 1 is in a state of straddling the excavation groove 200. By suspending the pipe 100 in this state, the pipe 100 is arranged in the excavation groove 200.

  After hanging the tube 100, the operator performs the above-described methods in reverse order. That is, the operator pulls the pipe transport carriage 1 as shown in FIG. 2E from the state where the pipe transport carriage 1 straddles the excavation groove 200 as shown in FIG. As shown in (d), the traveling wheels 21 and 23 are returned to the same side as the traveling wheels 22 and 24 with respect to the excavation groove 200. Subsequently, as shown in FIG. 2C, the slide bar 33 is slid to the original position, and the cross wheels 31 and 32 are pulled back to a position close to the vehicle body 10. Thereafter, the slide bar 33 is folded as shown in FIG. 2 (b), and the directions of the traveling wheels 21 and 22 are returned to their original positions as shown in FIG. 2 (a).

  FIG. 3A is a view showing a first grounding range R1 in the pipe transport carriage 1. FIG. FIG. 3B is a diagram showing a second grounding range R2 in the pipe transport carriage 1. (A) and (b) of FIG. 3 is a figure which shows the outline at the time of seeing the pipe conveyance trolley 1 from the downward direction. In (a) and (b) of FIG. 3, among the traveling wheels 21 to 24 and the crossing wheels 31 and 32, those that are grounded are indicated by solid lines, and those that are not grounded are indicated by broken lines.

  For example, in the state where the traveling wheels 21 to 24 are grounded as shown in FIG. 2A and the like, the grounding points 21a to 24a cause the first grounding range R1 as shown in FIG. It is prescribed. The slide bar 33 moves the cross wheels 31 and 32 in a direction crossing the extending direction of the tube 100 beyond the first grounding range R1.

  Further, for example, as shown in FIG. 2 (e), when the slide bar 33 extends and the transverse wheels 31 and 32 are held in the air, the traveling wheels 21 and 23 are positioned above the excavation groove 200, When it is not in a grounding state, the pipe transport carriage 1 is grounded by the traveling wheels 22 and 24 and the crossing wheels 31 and 32 while straddling the excavation groove 200. At this time, as shown in FIG. 3B, the second grounding range R2 is defined by the grounding points 22a and 24a and the grounding points 31a and 32a of the cross wheels 31 and 32. At this time, the posture of the pipe transport carriage 1 is maintained to be able to travel by the grounding points 22a, 24a, 31a and 32a.

  In this state, the direction of the traveling wheels 21 and 22 is fixed in a direction perpendicular to the excavation groove 200, and the direction of the transverse wheels 31 and 32 is freely changed. It is possible to travel in a direction intersecting with the extending direction (in other words, the extending direction of the tube 100). That is, the pipe conveyance carriage 1 can travel in a direction intersecting with the extending direction of the pipe 100 by defining the second grounding range R2.

  As described above, an operator who performs work using the pipe transport cart 1 simply installs the traverse wheels 31 and 32 at a position exceeding the first grounding range R1 and straddling the excavation groove 200. It is possible to easily straddle the excavation groove 200. In this state, the pipe carrier 1 can be run in a direction crossing the extending direction of the pipe 100, and the pipe 100 can be suspended in the excavation groove 200.

(Another method for straddling the excavation groove 200 over the pipe carrier 1)
In the method described with reference to FIG. 2, the pipe transport carriage 1 straddles the excavation groove 200 with the cross wheels 31 and 32 being moved. However, for example, when there is an obstacle right next to the excavation groove 200, when the pipe transport carriage 1 tries to straddle the excavation groove 200 while moving the cross wheels 31 and 32, the cross wheel 31 and There is a risk that 32 may come into contact and damage the obstacle and / or the pipe carrier 1.

  FIG. 4 is a diagram for explaining another method of straddling the excavation groove 200 over the pipe transport carriage 1. In the example shown in FIG. 4, the building B as an obstacle is immediately adjacent to the excavation groove 200. In such a case, when the excavation groove 200 is straddled over the pipe transport carriage 1, the worker is in a state where the crossing wheels 31 and 32 and the traveling wheels 22 and 24 are grounded as shown in FIG. Therefore, the vehicle body 10 may be slid with respect to the slide bar 33 as shown in FIG.

  In the tube transport carriage 1, the cross wheels 31 and 32 are moved by the slide bar 33 while maintaining a constant posture with respect to the ground. For this reason, the cross wheels 31 and 32 also function as auxiliary ground contact parts in the process of movement by the slide bar 33. That is, even when the vehicle body 10 is slid with respect to the slide bar 33, the tube transport carriage 1 can be grounded by the cross wheels 31 and 32 and the traveling wheels 21 and 23.

  According to the above method, as shown in FIG. 4, even when the building B exists immediately adjacent to the excavation groove 200, the worker makes the cross wheels 31 and 32 contact the building B. In addition, the excavation groove 200 can be straddled on the pipe transport carriage 1.

(Adjustment method for hanging position of tube 100)
FIG. 5 is a diagram for explaining a method for adjusting the hanging position of the pipe 100 by the pipe conveyance carriage 1. As described in the background art section, there is a safety problem for an operator to perform work while straddling the excavation groove 200. For this reason, as described above with reference to FIG. 2A, it is preferable that the pipe transport carriage 1 straddles the excavation groove 200 after transporting the pipe 100 to a position next to the position where the pipe 100 is suspended in advance. However, it may be necessary to adjust the position at which the pipe 100 is suspended after the pipe conveyance carriage 1 straddles the excavation groove 200.

  In this case, after the pipe transport carriage 1 straddles the excavation groove 200, the direction of the traveling wheels 21 and 22 may be changed to a direction parallel to the excavation groove 200 and fixed as shown in FIG. Thereby, the pipe conveyance trolley 1 can travel along the excavation groove 200 in a state of straddling the excavation groove 200 and adjust the position at which the pipe 100 is suspended.

[Embodiment 2]
Another embodiment of the present invention will be described below. For convenience of explanation, members having the same functions as those described in the above embodiment are given the same reference numerals, and the description thereof will not be repeated.

  The number of traveling wheels provided in the tube conveyance carriage 1 may be three, or may be five or more. Moreover, the number of crossing wheels with which the pipe conveyance cart 1 is provided may be one or three or more.

  Further, the pipe transport carriage 1 may include a moving mechanism different from the slide bar 33 in order to move the cross wheels 31 and 32. The moving mechanism may be, for example, a bar that is rotatable around a rotation axis that is substantially parallel to the tube 100 or a rotation axis that is substantially parallel to the vertical direction. In this case, the cross wheels 31 and 32 can be moved by attaching the cross wheels 31 and 32 to the bar and rotating the bar around the rotation axis.

  Further, the auxiliary ground contact portion is not limited to the cross wheels 31 and 32, and may be, for example, a support column. In particular, when the auxiliary grounding part is moved by the slide bar, the grounding position by the auxiliary grounding part is first grounded when the excavation groove is straddled on the pipe transport carriage by the method described with reference to FIG. There is no need to move from the position. That is, the auxiliary ground contact portion may be a portion that forms a ground contact point with at least one of the traveling wheels 21 to 24.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

1 Pipe transport carriage 21, 22, 23, 24 Traveling wheel 31, 32 Crossing wheel (auxiliary ground contact part)
21a, 22a, 23a, 24a, 31a, 32a Grounding point 33 Slide bar (moving mechanism)
100 tube R1 first grounding range R2 second grounding range

Claims (8)

A pipe transport carriage for hanging and transporting a pipe,
The auxiliary grounding part of the pipe transport carriage is arranged in a direction crossing the extending direction of the pipe beyond the first grounding range, which is a range surrounded by the grounding points related to each of the plurality of traveling wheels related to the pipe transport carriage. A tube transport carriage comprising a moving mechanism for moving.   In a state where the auxiliary grounding part is moved, a second grounding range which is a range defined by a grounding point related to the grounded one of the plurality of traveling wheels and a grounding point related to the auxiliary grounding part. The tube conveyance carriage according to claim 1, wherein traveling in a direction intersecting with an extending direction of the tube is possible.   In the state where the auxiliary grounding part is moved, the posture of the pipe transport carriage is maintained to be able to travel by the grounding point relating to the grounded one of the plurality of traveling wheels and the grounding point relating to the auxiliary grounding part. 2. The tube conveyance carriage according to claim 1, wherein traveling in a direction intersecting the extending direction of the tube is possible.   The tube transfer carriage according to any one of claims 1 to 3, wherein the moving mechanism is a slide bar that slides the auxiliary ground contact portion.   The tube transport carriage according to claim 4, wherein the slide bar is foldable.   The tube conveyance carriage according to any one of claims 1 to 5, wherein at least one of the plurality of traveling wheels can change the traveling direction and can be fixed at the changed position. .   The tube conveyance carriage according to any one of claims 1 to 6, wherein the auxiliary ground contact portion is a wheel capable of changing a traveling direction.   The pipe conveyance carriage according to any one of claims 1 to 7, wherein the position of the auxiliary ground contact portion can be adjusted up and down.

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