JP2001064915A - Transferring truck for constructing bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transferring truck capable of remarkably reducing the construction time and constructing a bridge in low cost and coping with a main girder the span of which varies. SOLUTION: This transferring truck for construction of a bridge is installed so as to stride main girders 3 of a bridge installed in pairs. The truck is driven to travel on the lower flange 3b overhung in the main girder 3 while using traveling wheels 5 provided in the truck. Column members 7 constituting the truck is moved along a beam 8 supported by the column members 7 or the truck is constituted of divided units separated in right and left sections to freely vary the width of the truck.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable trolley for bridge construction which can be moved along a main girder used for erection and construction of a bridge.

[0002]

2. Description of the Related Art Conventionally, as a movable trolley for bridge construction, as shown in FIG. 11, a movable trolley that moves along the longitudinal direction of two main girders 90, 90 that are erected horizontally and in parallel. Are known. The movable carriage 80 includes a plurality of pillars 8.
The front view is formed in a gate shape by the 5, 85 and the beam material 86, and is provided so as to straddle the main beams 90, 90.

[0003] The movable trolley 80 travels on rails 81, 81 with running wheels 82, 82 mounted on rails 81, 81 provided above the main girders 90, 90. When moving the movable carriage 80 by this method, it is necessary to arrange the rails 81, 81 above the concrete floor plate 91 so that the concrete floor plate 91 can be installed on the upper surfaces of the main girders 90, 90. Therefore, a number of rail mounts 83, 83 and rail fixing jigs 84, 84 are erected on the upper surfaces of the main girders 90, 90 along the longitudinal direction, and the rail fixing jig 8 is provided.
The rails 81, 81 are laid on the upper surfaces of the 4,84. In addition to the moving method shown in FIG.
A method has also been adopted in which a rail is arranged on the outer side surface of the main girder so as to extend in the longitudinal direction, and the movable carriage travels along the rail. For example, in the method shown in FIG. 12, two strip-shaped rails 93, 93 are arranged in parallel with the outer surface of the main girder 92, and these are mainly provided by erection plates 94, 94 that protrude to the side of the main girder 92. It is fixed to the outer surface of the girder. on the other hand,
Wheel attachment portions 96, 96 are attached to work scaffolds 95 provided on both sides of the movable cart so as to face the rails 93, 93. The running wheels 97, 97 are horizontally arranged inward and are mounted on the upper portions of the wheel mounting portions 96, 96, respectively. In addition, the wheel mounting portion 96,
A guide 9 that slides on the lower end surfaces of the rails 93 and 93 to guide the movable carriage along the rails 93
8,98 are provided.

[0004]

However, when the mobile trolley is run by the method shown in FIG.
3. It takes time, time and cost to install and remove the rail fixing jig 84 and the rails 81, 81,
The efficiency of bridge construction was inefficient. On the other hand, if the rail 93 is provided on the outer surface of the main girder 92 as shown in FIG. 12, it is extremely difficult to remove the rail 93 after the construction, so the bridge was completed with the rail 93 attached as it was. As a result, the appearance was getting worse.

[0005] In some bridges to be constructed, in order to form a part of the bridge wider than the other part, an interval between main girders arranged in parallel is widened by that part. In the case of constructing such a bridge, the conventional mobile trolley cannot cope.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a mobile trolley capable of significantly shortening the construction time, erection of a bridge at low cost, and coping with a main girder having a variable interval. provide.

[0007]

According to the first aspect of the present invention, there is provided a moving trolley (1) for bridge construction provided so as to straddle a main girder (3) of a bridge constructed in pairs. The movable trolley (1) is a bridge construction that travels on the upper surface of a lower flange (3b) projecting to the side of the main girder (3) by running wheels (5) provided in the movable trolley (1). The above object is solved by a mobile trolley (1).

According to the present invention, there is no need to separately install a traveling rail or the like on the main girder (3), and the bridge can be constructed efficiently and at low cost.

According to a second aspect of the present invention, in the movable trolley (1) for bridge construction according to the first aspect, the movable trolley (1).
Comprises a beam member (8) crossing the main girder (3) and a column member (7) for supporting the beam member (8) on both left and right sides, and the column members (7) move relative to each other in the left-right direction. It is characterized in that it is respectively engaged with the beam (8) and the running wheel (5) moves with the column (7).

According to the present invention, for example, in order to form a wide road-side zone on the bridge, even if there is a portion where the interval of the main girder (3) gradually increases, the movable trolley (1) is adapted to this.
Can be freely changed.

According to a third aspect of the present invention, in the movable trolley for bridge construction according to the first or second aspect, a plurality of the traveling wheels are arranged along a front-rear direction of the movable trolley. The wheels are provided so as to be independently movable in the left and right directions of the movable cart.

According to the present invention, on the outer surface of the main girder (3),
For example, even if there is an obstacle such as a stiffener (3c),
The running wheel (5) can be moved along the main girder (3) without contacting the obstacle.

According to a fourth aspect of the present invention, a bridge is provided so as to straddle a main girder (60) of a bridge constructed in a pair, and travels on an upper surface of the main girder (60) by running wheels (55). A mobile trolley (50) for construction, wherein the mobile trolley (5)
0) is a divided unit (51) divided in the left-right direction.
The divided units (51) are provided so as to be movable in the left-right direction with respect to each other, and the traveling wheels (55) are mounted on the divided units (51), respectively. This solves the above problem.

According to the present invention, the width of the movable carriage (50) can be freely adjusted in accordance with the interval of the main girder (60), even if the main girder (60) is erected so as to have a portion gradually widening. Can be changed to

According to a fifth aspect of the present invention, in the movable trolley (50) for bridge construction according to the fourth aspect, the movable trolley (5) is provided.
0) is a drop-off prevention mechanism (57, 57) for preventing the split unit (51) from dropping to the side from the main girder (60).
58) is provided between the division units (51).

According to the present invention, for example, if the division units (51) are connected to each other by a tension rod (57) as one of the falling-off prevention mechanisms, this tension rod (5)
If 7) is loosened and the movable cart (50) is run slowly, the split unit (51) is prevented from falling off,
It can correspond naturally to the interval of the main girder (60).
Also, as one of the drop-out prevention mechanisms, a counterweight (5
By providing a mechanism for ensuring the balance of the center of gravity such as 8), the movement of the division unit (51) can be performed stably.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a mobile trolley 1 according to the present invention.
1 shows an embodiment. The movable trolley 1 straddles two main girders 3, 3 which are formed by combining a plurality of shaped steel members vertically and horizontally and formed in a gate shape in front view and supported in parallel with the upper surface of a column 2 extending vertically. It is provided in. Running wheels 5, 5 and auxiliary wheels 6, 6 arranged along the front-rear direction are provided at the lower part of the movable trolley 1, and these are directly mounted on the upper surfaces of the lower flanges 3b, 3b at the lower ends of the main beams 3, 3. The mobile trolley 1 is running on the vehicle. Then, while moving along the longitudinal direction of the main girder 3, the concrete floor plate 4 is installed on the upper surface of the main girder 3.

The main girders 3, 3 are long band-shaped members, and flanges 3a, 3b are formed at upper and lower ends thereof so as to project outward. The flanges 3a and 3b are provided so as to be parallel to each other so as to project outward at upper and lower ends.

As shown in FIGS. 2 and 3, the movable trolley 1 includes a plurality of pillar members 7 # 7 arranged along the side surface of the movable trolley 1 extending vertically on both sides of the main beams 3, 3. Beams 8 # 8, which are arranged so as to cross the main beams 3 and 3 and both ends of which are supported by the pillars 7 # 7, extend in the front-rear direction between the pillars 7 # 7 and extend in the front-rear direction. 7 that connect the upper ends of the beams 7 to each other. Further, at the center in the vertical direction of the column members 7 # 7, reinforcing beam members 11 # 11 extending in the front-rear direction are arranged between the column members. Further, flat brackets 13 # 13 are provided at the central portion of each beam member 9 # 9 and the connecting portion between the column member 7 # 7 and the beam member 11 # 11.
The brackets 13 # 13 of the 9 and the brackets 13 # 13 of the beam 11 # 11 are bar-shaped reinforcing members 12 arranged diagonally.
12 are connected.

At the lower ends of the pillars 7 # 7, working scaffolds 20,
Reference numeral 20 is provided between the column members 7 # 7 and the main girders 3,3. The work scaffolds 20, 20 are beams 23, 23 extending from the lower ends of the pillars 7, 7 toward the outer surfaces of the main girders 3, 3.
And a beam member 22 which connects the tips of the beam members 23 # 23 so as to be parallel to the main girders 3 and 3, and which is attached so as to cover the entire surface of the scaffold with the upper surfaces of these beam members, not shown. And a mesh board. On the end faces of the work scaffolds 20 and 20 facing the main girders 3 and 3, traveling wheels 5 # 5 for traveling the movable vehicle 1 are provided at two places in front and behind the movable vehicle 1. An L-shaped frame 5A # 5A is attached to the outer side of the traveling wheel 5 # 5, and a side roller 5B # 5B is provided at an end thereof. The side rollers 5B # 5B are horizontally arranged disk-shaped rollers, and support the traveling of the movable carriage 1 by bringing the outer peripheral surface thereof into contact with the side surfaces of the lower flanges 3b, 3b.

The work scaffolds 20 and 20 are movable carts 1
Are provided so as to protrude from the front end and the rear end of the vehicle, and auxiliary wheels 6 # 6 are provided on the lower surface of the front end and the rear end of the protruding portion to support the movable trolley 1 and assist traveling. I have. Further, the movable trolley 1
Cylinder 2 for lifting the machine from the main girders 3 and 3
5 ‥ 25 is provided. These jack cylinders 2
5 ‥ 25 is attached to a box-shaped beam 24 ‥ 24 attached to the lower surface of the tip of the beam member 23 ‥ 23. A plurality of screw holes are provided along the longitudinal direction on the upper surface of the beams 24 # 24 and the lower surface of the beams 23 # 23, and the beams 24 # 24 are positioned at desired positions of the beams 23 # 23. Can be screwed on. In addition, each traveling wheel 5
On the outside of # 5, wheel inspection scaffolds 30, 30 formed like cages for inspecting these wheels are attached to the lower surfaces of the work scaffolds 20, 20 separately at the front and the rear. .

A strip-shaped horizontal girder 3 connecting the main girder 3, 3
A flange is formed at the upper end and the lower end of A, and support jacks 31, 31 for supporting the installed concrete floor plate 4 from below are provided on the upper end flange 3B so as to extend vertically. This support jack 31,
31 is provided on the upper end of the main girder form 3 formed of a thick member.
2 is attached, and the upper surface is
To prevent the concrete floor plate 4 from deforming. Support jacks 33 are also provided on the upper surfaces of the work scaffolds 20 so as to extend vertically, and an outer mold frame 34 is provided at the upper end thereof. The outer frame 34 is formed of a thick member, and is brought into contact with the lower surface of the portion of the concrete floor panel 4 projecting outward from the main girder, thereby preventing both sides of the concrete floor panel 4 from deforming. are doing.

The column members 7 # 7 of the movable trolley 1 are attached to the beam members 8 # 8 so as to be able to move from side to side with respect to each other.
The width of the movable cart 1 can be freely changed. As shown in FIGS. 4 and 5, the column members 7 and the respective beam members 8 are formed of an H-beam having high strength. On the bottom surface on both left and right sides of the beam 8,
Mounting holes 8a ‥ 8a are provided at a pitch of about 100 mm along the longitudinal direction of the beam 8. On the other hand, a flat plate-like end plate is fixed to the upper end of the column member 7, and the end plate 7a has three mounting holes 8a８8a for the beam member 8.
Attachment holes 7b # 7b are provided at intervals of 100 mm. Then, the column member 7 is moved to a desired position along the longitudinal direction of the beam member 8 so that the mounting holes 7b and 7b match the desired positions of the mounting holes 8a and 8a, and the bolt 35
The column member 7 is fixed to the beam member 8 with the nut 5 and the nuts 36 ‥ 36.

The joint between the column member 7 and the beam member 8 includes
A substantially triangular reinforcing block 37 is provided, which is brought into close contact with the inner side surface of the column member 7 and the lower surface of the beam member 8 to receive a moment generated between the column member 7 and the beam member 8 and improve the rigidity of the movable carriage 1. ing. The reinforcing block 37 has a mounting hole 37 on the side surface.
a ‥ 37a are formed, and the mounting holes 37a ‥ 37
a is formed with holes 7c, 7c formed on the inner side surface of the pillar member 7 and the beam member 8;
Of the mounting holes 8a and 8a, and the bolts 35
35 and nuts 36 ‥ 36. However, the reinforcing block 37 may be attached to the outside of the pillar 7.

Also, if a plurality of holes 8b # 8b are provided on the upper surface of the beam member 8 along the longitudinal direction of the beam member 8 at positions corresponding to the mounting holes 8a # 8a provided on the bottom surface, assembly is possible. In this case, even if the beam member 8 is turned upside down, the column member 7 can be conveniently connected.

The movable carriage 1 is lifted from the main girders 3 and 3, and the column members 7 # 7 are moved in the left-right direction as follows.

First, the lower ends of the rods 26 of the jack cylinders 25 # 25 provided on the working scaffolds 20, 20 are set on the upper surfaces of the lower flanges 3b, 3b below the main beams 3, 3. Next, the movable cart 1 is lifted from the main girders 3 and 3 by extending the rod 26. Then, the movable trolley 1 is maintained in a state of being lifted by sandwiching the columns 10 # 10 between the respective beam members 8 # 8 and the upper surfaces of the main girders 3 and 3 or the upper surface of the concrete floor plate 4. Thereafter, for example, the column member 7 is suspended by the moving device 40 shown in FIG.
Along the longitudinal direction (the direction penetrating the plane of FIG. 6).

The moving device 40 is provided with a frame 41 forming an outer shell, a pinion 43 rotatably mounted on the frame 41 via a rotary shaft 42, and mounted so as to protrude to the side of the frame 41. A drive motor 44 connected to the shaft 42 is provided. At the lower end of the frame 41, a claw portion 4 bent inward toward the center of the column member 7 is provided.
5, 45 are formed. The pillar 7 is provided with the claws 45,
45 is engaged with the end plate 7 a attached to the column member 7 from both sides, and is movably supported by the beam member 8. A rack 46 that meshes with the pinion 43 is attached to the upper surface of the beam 8. The rack 46 is provided with bolts 46a ‥ 4 in holes 8b provided on the upper surface of the beam 8 described above.
6a and nuts 46b and 46b. The column member 7 moves along the longitudinal direction of the beam member 8 (the direction penetrating the plane of FIG. 6) by moving while the pinion 43 of the moving device 40 meshes with the rack 46 attached to the upper surface of the beam member 8. . However, the means for moving the column member with respect to the beam member is not limited to this, and may be a combination of a chain and a sprocket or a hydraulic cylinder.

As described above, the movable trolley 1 is
Since # 7 moves left and right, for example, as shown in FIG.
Even when a concrete floorboard is installed on a portion erected so that the interval between the main girders 3 and 3 gradually increases on the upper surface of the column 2, the width of the movable carriage can be adapted to the interval between the main girders 3 and 3, The construction work can be performed using only one mobile trolley.

Further, the traveling wheels and the auxiliary wheels of the movable trolley are attached to the working scaffold so as to be movable independently in the left-right direction.

FIG. 8 shows one embodiment of the mounting of the traveling wheels 5. The work scaffold 20 is provided with two parallel I-beams 28, 28 orthogonal to the beams 22, 22 facing the outer surface of the main girder 3. This I-beam 28,
A beam 27 that slides along the I-beams 28 is provided between the beams 28. The traveling wheel 5 is provided with a short column 5 b protruding from the upper surface of the wheel house 5 a attached to the lower surface at the tip of the beam 27.

As described above, by providing the traveling wheels and the auxiliary wheels so as to be individually movable, the movable carriage can be caused to travel without bringing the traveling wheels and the auxiliary wheels into contact with the obstacle of the main girder. For example, as shown in FIG. 8, when the traveling wheel 5 approaches a stiffener 3 c for reinforcing the main girder 3 provided on the outer surface of the main girder 3, the traveling wheel 5 is moved to the lower flange 3 b of the main girder 3. It is moved outward to pass through the stiffener 3c. While the traveling wheel 5 is away from the lower flange 3b, an auxiliary wheel closer to the traveling wheel 5 is placed on the lower flange 3b, and the movable carriage is moved by the auxiliary wheel to the lower flange 3b. Moving up in support.

Next, a second embodiment of the present invention will be described with reference to FIG.

The moving trolley 50 shown in FIG. 9 is for placing the concrete floor plate 4 while traveling along the box-shaped main girders 60 without flanges which are installed in pairs on columns not shown. belongs to. The main digits 60, 60
The upper and lower ends are connected by a flat horizontal girder 61 having flanges 61a and 61b. Also, on the upper surfaces of the main girders 60, 60, rail mounts 62 # 62 are provided at regular intervals in the longitudinal direction.
Is provided, and rails 63 for moving the mobile trolley 1 are provided.
# 63 is the main girder 6 on the upper surface of these rail mountings 62 # 62.
It is laid two by two so as to extend along the longitudinal direction of 0,60.

The horizontal girder 61 is provided with a plurality of support jacks 64 # 64, and the main girder form 65 is supported by the support jacks 64 # 64 from below. The support jacks 64 # 64 and the formwork 65 between the main girders support the portion between the main girders of the installed concrete floor panel 4.

In this figure, a part drawing a curve centering on the right side of the figure is shown, and the bank is formed by inclining the right side of the installed concrete floor plate 4 downward. The right main girder 60 is installed at a position lower than the left main girder 60.

On the other hand, the movable trolley 50 is configured so that two divided units 51, 51 each having a substantially U-shape in front view are opposed to each other, and are provided so as to straddle the main girders 60, 60. Each of the divided units 51, 51 has a main girder 60, 60.
Vertically extending column members 52, 52 arranged along the main girders 60, 60 on the outside of the vehicle, and beam members 53, 53 projecting from the upper ends of these column members 52, 52 toward the center of the movable carriage 1. At the lower part of the pillars 52, 52, the main girders 60, 60 and the pillars 52, 5
2 and a work scaffold 70, 70 disposed between the work scaffolds 70 and 70. At the center in the left-right direction of each of the beams 53, there are provided columns 54, 54 projecting toward the rails 63, 63 on the main beams 60, 60, respectively.
Traveling wheels 55-55 are attached to the lower end of 54. The movable carriage 50 travels on the rails 63 # 63 along the longitudinal direction of the main beams 60, 60 with the traveling wheels 55 # 55 on the rails 63 # 63. In addition, struts 54, 5
4, reinforcing members 56 ‥ 56 are provided, and the struts 54 ‥ 5
4 prevents the mobile trolley 1 from being bent by its own weight.

The work scaffolds 70, 70 arranged between the main girders 60, 60 and the pillars 52, 52 on both sides of the movable carriage 50 are provided with safety fences 71, 71 surrounding the periphery thereof. It is provided for. Also, the work scaffolds 70, 7
0 is provided with support jacks 72 # 72 extending vertically, respectively.
Supports the flat outer frames 73, 73 from below.
The upper surfaces of the outer mold frames 73 and 73 are brought into contact with the lower surface of the side of the concrete floor plate 4 on which the concrete frame plate 4 is installed to support the side of the concrete floor plate 4. On the other hand, the work scaffolds 70, 70
On the lower side, there are provided second work scaffolds 74, 74 formed like elongated cages along the outer surfaces of the main girders 60, 60, respectively.

The split units 51, 51 have rod-shaped connecting devices 57 provided between the tips of the beams 53, 53 in order to prevent them from falling off to the side of the main beams 60, 60. Are connected by Further, flat rectangular parallelepiped counterweights 58, 58 for maintaining the weight balance of the respective divided units 51, 51 are provided at the tips of the respective beams 53, 53.
Is attached.

As shown in FIG. 10, the connecting device 57 includes an elongated rod-like tension rod 57A, a U-shaped shackle 57B into which the end of the tension rod 57A is screwed, and a beam member 53. And a pin 57C to be locked to the lock. Screw portions 57a are provided at both ends of the tension rod 57A, and are screwed to the rear end of the shackle 57B. A beam 53 is inserted between the forked ends of the shackle 57B, and a pin 57C penetrates from the side thereof to lock the shackle 57B to the beam 53.

The tension rod 57A is connected to the shackle 57
When rotated with respect to B, the distance between the illustrated shackle 57B and the shackle attached to the opposite end (not shown) can be changed, and can be adapted to the distance between the divided units.

According to the movable carriage 50, the two main girders 6
When a concrete floor panel is installed on a portion erected so that the interval between 0 and 60 gradually widens, the division units 51 and 51 can be gradually moved to the left and right by gradually loosening the tension rods 57 from the front side and slowly moving the movable cart forward. It can be spread and adapted to the spacing of the main girders 60,60.

[0044]

As described above, according to the mobile trolley according to the first aspect of the present invention, there is no need to separately provide a rail for running the mobile trolley on the main girder, and the construction of the bridge can be performed efficiently and at low cost. Can be done at cost.

Further, in the mobile trolley according to the invention as set forth in claims 2 to 5, even when a portion where the interval between the main girders installed on the column is widened is constructed, the movable trolley is adjusted to the interval between the main girders. Can be freely changed, and can be constructed with one moving cart.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a movable trolley according to an embodiment of the present invention.

FIG. 2 is a side view of the movable cart shown in FIG. 1;

FIG. 3 is a partially cutaway front view of the movable cart shown in FIG. 1;

FIG. 4 is a vertical cross-sectional view showing a connecting portion between a column member and a beam member of the movable trolley in FIG. 1;

FIG. 5 is a side view of the connecting portion of FIG. 4 as viewed from the outside of the pillar.

FIG. 6 is a schematic view showing one embodiment of a moving device for moving a column member along a beam member.

FIG. 7 is a perspective view showing a main girder erected so that the width gradually increases.

FIG. 8 is a perspective view showing one embodiment of a traveling wheel movably attached to a work scaffold.

FIG. 9 is a front view of a mobile trolley according to another embodiment different from the mobile trolley of FIG. 1;

FIG. 10 is an explanatory view showing an end of a connecting device for connecting the split units.

FIG. 11 is a front view showing one embodiment of a conventional mobile trolley.

FIG. 12 is a front view of a working scaffold of the mobile trolley for moving the main girder by a method different from that of the mobile trolley in FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Moving trolley 2 Post 3,60 Main girder 4 Concrete floor board 5 Running wheel 6 Auxiliary wheel 7,52 Column 8,53 Beam 9 Beam 10 Column 11 Beam 20,70 Scaffolding for work 22 Beam 23 Beam 24 Beam 25 Jack cylinder 27 Beam 31, 33, 64, 72 Support jack 32, 65 Formwork between main girders 34, 73 Outer formwork 40 Moving device 50 Moving trolley 51 Split unit 54 Support column 55 Wheel 57 Connecting device 58 Counter weight 62 Rail Kedai 63 Rail 74 Second scaffold for work

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor, Yoshimitsu Inomata 88, Ono-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Japan F-term (reference) 2D059 AA14 CC04 DD09 DD17 DD20

Claims (5)

[Claims] 1. A moving vehicle for bridge construction provided so as to straddle a main girder of a bridge constructed in pairs, wherein the moving vehicle is a traveling wheel included in the moving vehicle. A moving trolley for bridge construction, characterized in that the trolley runs on the upper surface of a lower flange projecting to the side of the main girder. 2. The movable trolley includes a beam that traverses the main girder, and a column that supports the beam on both left and right sides. The column is respectively movable with the beam in a left-right direction. The mobile trolley for bridge construction according to claim 1, wherein the traveling wheel is engaged and the traveling wheel moves together with the column material. 3. The vehicle according to claim 1, wherein a plurality of the traveling wheels are arranged along a front-rear direction of the movable trolley, and the traveling wheels are provided so as to be independently movable in a left-right direction of the movable trolley. The movable trolley for bridge construction according to claim 1 or claim 2. 4. A moving vehicle for bridge construction, which is provided so as to straddle a main girder of a bridge constructed in pairs and travels on an upper surface of the main girder with running wheels, wherein the moving vehicle is It is composed of divided units divided in the left-right direction, these divided units are respectively provided so as to be movable in the left-right direction, and the running wheels are attached to these divided units, respectively. Moving trolley. 5. The movable trolley is provided with a drop-off preventing mechanism for preventing the split unit from dropping from the main girder to the side thereof, between the split units.
The mobile trolley for bridge construction described.