CN117341742A - Track beam's operation car - Google Patents

Abstract

The invention provides a working vehicle of a track beam, comprising: the horizontal wheel assembly is arranged on the working vehicle body and suitable for rolling along the running surface of the track beam, the first working platform is located on the side of the track beam and connected to the first end portion of the working vehicle body in the width direction, the bottom of the first working platform is not lower than the bottom of the track beam, the second working platform is connected with the first working platform and can move relative to the first working platform so that the second working platform can be switched between a storage state and a working state, when the second working platform is in the working state, the second working platform is located below the first working platform and at least partially located below the track beam, and when the second working platform is in the storage state, projection of the second working platform and a bridge lower structure in the vertical direction is not overlapped.

Description

Track beam's operation car

Technical Field

The invention belongs to the field of rail transit, and particularly relates to a working vehicle of a rail beam.

Background

In the working vehicle of the track beam in the related art, when the working vehicle walks along the track beam, the working platform of the working vehicle is positioned below the track beam, so that the hidden danger of collision between the working platform and the lower structure of the bridge exists.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the working vehicle of the track beam, which eliminates the hidden danger of collision between the working platform and the lower structure of the bridge when the working vehicle walks along the track beam.

The working vehicle of the track beam according to the present invention comprises:

a working vehicle body;

the running wheels are arranged on the operation vehicle body and are suitable for rolling along the running surface of the track beam;

a horizontal wheel assembly disposed on the work vehicle body adapted to roll along a side of the rail beam;

the first operation platform is positioned at the side of the track beam and connected to the first end part of the operation vehicle body in the width direction, and the bottom of the first operation platform is not lower than the bottom of the track beam;

the second working platform is connected with the first working platform and can move relative to the first working platform, so that the second working platform can be switched between a storage state and a working state;

when the second working platform is in the working state, the second working platform is positioned below the first working platform and at least partially positioned below the track beam;

when the second working platform is in the storage state, the projection of the second working platform and the lower structure of the bridge in the vertical direction is not overlapped.

According to some embodiments of the invention, the second work platform is connected to the first work platform through a first rotation shaft, and the work vehicle further comprises a lifting assembly, wherein the lifting assembly is used for enabling the second work platform to rotate around the first rotation shaft relative to the first work platform, so that the second work platform can be switched between a storage state and a working state.

According to some embodiments of the invention, the lifting assembly comprises a first hoist and a second hoist, the first hoist is connected to the second work platform by a first connecting rope and is connected to a first connecting point, the second hoist is selectively connected to a second connecting point by a second connecting rope and is arranged at intervals along the width direction of the second work platform and the first connecting point.

According to some embodiments of the invention, the first work platform comprises a guard rail and a pad, wherein the guard rail encloses a cavity with two open ends, and the pad is configured to selectively open or close a lower end opening of the guard rail;

when the second working platform is in the working state, the base plate is arranged at a position for opening the lower end opening so that an operator can enter the second working platform from the first working platform.

According to some embodiments of the invention, the number of pads is two, wherein at least one pad is rotatably mounted to the guard rail.

According to some embodiments of the invention, the working vehicle further comprises an access platform which is on the same side as the first working platform and is connected with any one of two ends of the guard rail in the length direction, a first opening is formed on the access platform towards the track beam, and a second opening which is communicated with the upper end opening of the guard rail is formed on the access platform.

According to some embodiments of the invention, a counterweight assembly for balancing the work vehicle is provided on a second end portion in a width direction of the work vehicle body.

According to some embodiments of the invention, the work vehicle further comprises a rollover prevention device adapted to be mounted on the work vehicle body at least partially below the deck of the track beam.

According to some embodiments of the invention, the level wheel assembly includes a level wheel and a mount assembly, the level wheel is coupled to the work vehicle body by the mount assembly, and the level wheel is movable relative to the mount assembly.

According to some embodiments of the invention, the mounting seat assembly comprises a fixed seat and a steering seat, wherein the fixed seat is detachably connected to the working vehicle body, one end of the steering seat is connected with the fixed seat through a second rotating shaft, and the other end of the steering seat is connected with the horizontal wheel.

According to some embodiments of the invention, the fixing seat is provided with a first through hole and a second through hole, the steering seat is provided with a third through hole corresponding to the first through hole and a fourth through hole corresponding to the second through hole, and the steering seat is penetrated into the first through hole and the third through hole or penetrated into the second through hole and the fourth through hole by bolts so as to limit the horizontal wheel.

According to some embodiments of the invention, the working vehicle further comprises a brake assembly, the brake assembly is suitable for being installed on any one of two ends of the working vehicle body in the length direction, the brake assembly comprises a connecting rod, and two ends of the connecting rod are respectively connected with a pressure handle, a telescopic rod and a brake block in sequence;

when the operation vehicle brakes, the operator presses down the connecting rod, and drives the telescopic rod to move downwards through the pressure handle, so that the brake block clings to the running surface.

Compared with the prior art, the invention has the following advantages:

according to the working vehicle disclosed by the embodiment of the invention, when walking along the track beam, the bottom of the first working platform is not lower than the bottom of the track beam, and the second working platform is in the storage state, so that the hidden danger of collision between the working platform of the working vehicle and the lower structure of the bridge is eliminated.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic illustration of a work vehicle according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a second working platform of a working vehicle in a working state according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a second working platform of a working vehicle in a storage state according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a brake assembly according to an embodiment of the present invention;

FIG. 5 is a schematic view of a horizontal wheel assembly with pins passing through the second and fourth through holes according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a horizontal wheel assembly with pins penetrating through the first through hole and the second through hole according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

A work vehicle 100 according to an embodiment of the present invention is described in detail below with reference to fig. 1-6.

The x direction in the drawing is the width direction of the work vehicle body 1, the width direction of the second work platform 5, the y direction is the length direction of the guard rail 41, the length direction of the work vehicle body 1, and the z direction is the vertical direction, and the up-down direction.

As shown in fig. 1, a work vehicle 100 for a track beam according to an embodiment of the present invention includes: a working vehicle body 1, a travelling wheel 2, a horizontal wheel assembly 3, a first working platform 4 and a second working platform 5.

Specifically, as shown in fig. 1 and 2, the running wheels 2 are provided on the work vehicle body 1, adapted to roll along the running surface of the track beam 200, the horizontal wheel assembly 3 is provided on the work vehicle body 1, adapted to roll along the side surface of the track beam 200, the first work platform 4 is located laterally of the track beam 200 and connected to the first end portion in the width direction of the work vehicle body 1, and the bottom portion of the first work platform 4 is not lower than the bottom portion of the track beam 200, and the second work platform 5 is connected to the first work platform 4 and movable relative to the first work platform 4 to switch the second work platform 5 between the storage state and the working state, the second work platform 5 being located below the first work platform 4 and at least partially below the track beam 200 when the second work platform 5 is in the storage state, and the projection of the second work platform 5 and the bridge lower structure in the vertical direction do not overlap.

The bridge substructure is a structure that supports a bridge span structure and transmits its load to a foundation, and generally includes a support, a bridge pier, a bridge abutment, a foundation, and the like.

According to the working vehicle 100 of the track beam provided by the invention, when the working vehicle 100 walks on the track beam 200, the second working platform 5 is in the storage state, and the bottom of the first working platform 4 is not lower than the bottom of the track beam 200, so that interference between the first working platform 4 and the second working platform 5 and the bridge substructure is avoided, in other words, the hidden danger of collision between the first working platform 4 and the second working platform 5 and the bridge substructure is eliminated.

It should be noted that the "track beam 200" herein may refer to a single track rail, a double track rail, or other forms of rail beams, etc.; the track beam 200 shown in fig. 2 is a dual-rail track beam, and in the following embodiments, a dual-rail track beam will be described as an example.

In some embodiments of the present invention, the number of the horizontal wheel assemblies 3 is plural, for example, four horizontal wheel assemblies 3, as shown in fig. 1 and 2, the horizontal wheel assemblies 3 disposed opposite to each other in the longitudinal direction of the working vehicle body 1 form a pair of horizontal wheel assemblies 3, and two pairs of horizontal wheel assemblies 3 are disposed at intervals in the width direction of the working vehicle body 1, and when the working vehicle 100 walks on the track beam 200 and turns, at least one pair of horizontal wheel assemblies 3 is pressed against the inner side surface of the track beam 200 and rolls along the inner side surface of the track beam 200, thereby realizing the turning function of the working vehicle 100.

In other embodiments of the present invention, at least one pair of horizontal wheel assemblies 3 is pressed against the outer side of rail beam 200 and rolls along the outer side of rail beam 200 when work vehicle 100 is traveling on rail beam 200 and turns, thereby performing the function of turning work vehicle 100.

The second work platform 5 is connected to the first work platform 4 and is movable relative to the first work platform 4 to switch the second work platform 5 between the storage state and the working state, it is to be understood that the movement herein may include various forms of movement such as movement or rotation, as long as the second work platform 5 can be switched between the storage state and the working state, for example, the second work platform 5 may be moved relative to the first work platform 4 in the width direction thereof to switch the second work platform 5 between the storage state and the working state, or the second work platform 5 may be rotated relative to the first work platform 4 to switch the second work platform 5 between the storage state and the working state.

In some embodiments of the present invention, the second working platform 5 may be moved along the width direction thereof relative to the first working platform 4 to enable the second working platform 5 to switch between the storage state and the working state, specifically, the second working platform 5 may be slidably connected to the first working platform 4 through a sliding rail, and when the second working platform 5 is switched from the storage state to the working state, the second working platform 5 may be slid along the width direction thereof to be close to the track beam 200, thereby enabling the second working platform 5 to switch from the storage state to the working state.

In other embodiments of the present invention, as shown in fig. 2 and 3, the second working platform 5 may rotate relative to the first working platform 4 to implement the conversion between the storage state and the working state of the second working platform 5, specifically, may be implemented in a manner that the second working platform 5 is connected to the first working platform 4 through the first rotation shaft 6, and the working vehicle 100 further includes a lifting assembly 7, where the lifting assembly 7 is used to implement a function of rotating the second working platform 5 from the storage state to the working state, or implement a function of rotating the second working platform 5 from the working state to the storage state.

In some embodiments of the present invention, the lifting assembly 7 is a motor (not shown in the drawings), an output end of the motor is in driving connection with the first rotating shaft 6, and the second working platform 5 is switched between the storage state and the working state by forward and reverse rotation of the motor, for example, the motor is controlled to rotate forward, so that the second working platform 5 is switched from the storage state to the working state, and when the second working platform 5 needs to be controlled to switch from the working state to the storage state, the motor can be controlled to rotate reversely.

In some embodiments of the present invention, the lifting assembly 7 is a hoist, the hoist is connected to the second working platform 5 through a rope, the hoist drives the rope to move to realize the transition between the storage state and the working state, for example, the hoist is controlled to drive the rope to descend, so that the second working platform 5 is converted from the storage state to the working state, and when the second working platform 5 needs to be controlled to be converted from the working state to the storage state, the hoist is controlled to drive the rope to ascend.

The number of the hoists may be one or more, and is not limited herein.

When the number of the hoists is two, the lifting assembly 7 comprises a first hoist 71 and a second hoist 74, the first hoist 71 is connected with the second working platform through a first connecting rope 72 to a first connecting point 73, the second hoist 74 is selectively connected with the second working platform through a second connecting rope 75 to a second connecting point 76, and the second connecting point 76 and the first connecting point 73 are arranged at intervals along the width direction of the second working platform 5. When the second working platform 5 needs to be controlled to be converted from the storage state to the working state, the first hoist 71 can be controlled to drive the first connecting rope 72 to descend, if the deviation angle between the working state position of the second working platform 5 and the preset position is found to be too large, the second hoist 74 can be connected with the second working platform through the second connecting rope 75, and the second hoist 74 is controlled to drive the second connecting rope 75 to move so as to correct the working state position of the second working platform 5, so that the safety of operators on the second working platform 5 is ensured.

The first hoist 71 and the second hoist 74 may be electric hoists, or may be manual hoists, or one may be an electric hoist, and the other may be a manual hoist, which is not limited herein.

In some embodiments of the present invention, the second connection rope 75 may be connected to the second connection point 76 through the second hook and the second working platform 5, and if the second working platform 5 is found to be in the working state and the angle deviated from the preset position is too large, the second hook may be hooked on the second connection point 76 of the second working platform 5; if the deviation angle between the working position of the second working platform 5 and the preset position is smaller, the second hook is not hooked on the second connection point 76 of the second working platform 5, so that the second hoist 74 can be selectively connected with the second working platform 5 through the second connection rope 75 to the second connection point 76.

In some embodiments of the present invention, the first connection rope 72 may be connected to the first connection point 73 through the first hook and the second work platform 5, and the first connection point 73 and the second connection point 76 may be spaced apart along the width direction of the second work platform 5. It should be noted that the first connection point 73 and the second connection point 76 may be located on the same plane and disposed at intervals along the width direction of the second work platform 5, or the first connection point 73 and the second connection point 76 may not be located on the same plane, but their projections along the vertical direction are disposed at intervals along the width direction of the second work platform 5.

In some embodiments of the present invention, the first working platform 4 is provided with a lock catch 8, and when the second working platform 5 is converted from the storage state to the working state, the second working platform 5 can be locked by the lock catch 8, so as to prevent the second working platform 5 from moving relative to the first working platform 4, thereby ensuring the safety of the operator located on the second working platform 5.

In some embodiments of the present invention, as shown in fig. 1, the first work platform 4 includes a guard rail 41 and a pad 42, wherein the guard rail 41 encloses a cavity having two open ends, the pad 42 is configured to selectively open or close the lower opening of the guard rail 41, and when the second work platform 5 is in the working state, the pad 42 is placed in a position to open the lower opening for an operator to enter the second work platform 5 from the first work platform 4. The first working platform 4 is used for working the side of the track beam 200 by the operator, the second working platform 5 is used for working the lower side of the track beam 200 by the operator, when the working vehicle 100 is parked on the track beam 200 for working, the second working platform 5 is converted into the working state from the storage state, at this time, the second working platform 5 is located below the first working platform 4 and at least partially located below the track beam 200, the operator firstly enters the first working platform 4 to work the side of the track beam 200, then the pad 42 is placed at a position for opening the lower end opening, and enters the second working platform 5 from the lower end opening to work the upper side of the track beam 200.

The number of the first work platforms 4 and the second work platforms 5 may be one or two, and is not limited herein.

In some embodiments of the invention, the number of pads 42 is two, wherein at least one pad 42 is rotatably mounted to the guard rail 41. Specifically, the two pad plates 42 are oppositely disposed and respectively pivoted to the guard rail 41, the two pad plates 42 can rotate around respective pivot points to open or close the lower end opening of the guard rail 41, when the lower end opening of the guard rail 41 needs to be opened, one pad plate 42 can rotate around the pivot point, and the other pad plate 42 can be used for the operator to fall down, so that the safety of the operator is protected.

In some embodiments of the present invention, as shown in fig. 1-4, the working vehicle 100 further includes a brake assembly 10, the brake assembly 10 is adapted to be mounted on any one of two ends of the working vehicle body 1 in the length direction, the brake assembly 10 includes a connecting rod 101, two ends of the connecting rod 101 are sequentially connected with a pressure handle 102, a telescopic rod 103 and a brake block 104, and when the working vehicle 100 brakes, a worker presses the connecting rod 101, and drives the telescopic rod 103 to move downwards through the pressure handle 102, so that the brake block 104 clings to a running surface. The connecting rod 101 can also be used as a trolley handle, an operator stands on the evacuation channel 201, the walking wheel 2 rolls along the walking surface of the track beam 200 by pushing the connecting rod 101, when the operation vehicle 100 is pushed to an operation position, the operator presses the connecting rod 101, and the telescopic rod 103 is driven to move downwards by the pressure handle 102, so that the brake block 104 is tightly attached to the walking surface, and the operation vehicle 100 is braked.

It should be noted that the number of the brake assemblies 10 may be two, and two brake assemblies 10 may be respectively mounted at two ends of the working vehicle body 1 in the length direction, so that the working personnel can conveniently push the working vehicle 100 in two directions.

In other embodiments of the invention, the work vehicle further comprises a drive means (not shown in the figures), such as a motor, for driving the running wheels 2 to roll along the running surface of the track beam 200 for running the work vehicle 100 to the work position.

When the working vehicle 100 is parked on the track beam 200 to perform a work, a worker may enter the first working platform 4 from the working vehicle body 1, may enter the first working platform 4 from the running surface of the track beam 200, or may enter the first working platform 4 from the entering platform 9, which is not limited herein.

In some embodiments of the present invention, the access platform 9 is on the same side as the first working platform 4 and is connected to either one of the two ends of the guard rail 41 in the length direction, the access platform 9 is formed with a first opening toward the track beam 200, and the access platform 9 is also formed with a second opening communicating with the upper end opening of the guard rail 41.

In some embodiments of the present invention, a counterweight assembly 11 for balancing the work vehicle 100 is provided on the second end portion in the width direction of the work vehicle body 1. Specifically, the counterweight assembly 11 includes a counterweight box, and the counterweight box is internally provided with a counterweight block, so that the number of the counterweight blocks can be adjusted according to actual needs, and when the working vehicle 100 rolls towards the direction of the first working platform 4, the counterweight block is increased to maintain the balance of the working vehicle 100, thereby avoiding the rollover of the working vehicle 100 and improving the safety of the working vehicle working aloft.

In some embodiments of the present invention, work vehicle 100 also includes rollover prevention device 12, with rollover prevention device 12 being adapted to be mounted on work vehicle body 1 and located at least partially below barrier 202 of track beam 200 to stop rollover prevention device 12 against barrier 202 when work vehicle 100 is tilted. When the working vehicle 100 is not provided with the counterweight assembly 11 or the counterweight assembly 11 cannot balance the working vehicle 100, the rollover prevention device 12 is matched with the baffle 202, so that rollover of the working vehicle 100 is avoided, and the safety of high-altitude working of the working vehicle is further improved.

In some embodiments of the present invention, as shown in fig. 1, 5 and 6, the level wheel assembly 3 includes a level wheel 31, the level wheel 31 is connected to the work vehicle body 1 by a mount assembly 32, and the level wheel 31 is movable relative to the mount assembly 32. When the working vehicle 100 is hoisted on the track beam 200, the position of the horizontal wheel 31 is adjusted so that the working vehicle 100 does not interfere with the baffle 202 of the track beam 200, thereby protecting the working vehicle 100 and the track beam 200 and facilitating construction operation.

The horizontal wheel 31 may be movable relative to the mounting assembly 32, and it is understood that the movement herein may include various forms of movement such as movement or rotation, for example, the horizontal wheel 31 may be movable relative to the mounting assembly 32 in the width direction of the work vehicle body 1, or the horizontal wheel 31 may be rotatable relative to the mounting assembly 32 in the length direction of the work vehicle body 1.

In some embodiments of the present invention, the horizontal wheel 31 is movable relative to the mounting seat assembly 32 in the width direction of the work vehicle body 1, and in particular, the horizontal wheel 31 is connected to the mounting seat assembly 32 through a piston rod (not shown in the drawings), and when the work vehicle 100 is hoisted on the track beam 200, the horizontal wheel 31 is pushed to move in a direction approaching the mounting seat assembly 32, so that the position of the horizontal wheel 31 is adjusted, so that the work vehicle 100 does not interfere with the barrier 202 of the track beam 200.

In other embodiments of the present invention, the horizontal wheel 31 may rotate along the length direction of the working vehicle body 1 relative to the mounting seat assembly 32, specifically, the mounting seat assembly 32 may be implemented by a fixed seat 321 and a steering seat 322, where the fixed seat 321 is detachably connected to the working vehicle body 1, one end of the steering seat 322 is connected to the fixed seat 321 through a second rotation shaft 33, and the other end of the steering seat 322 is connected to the horizontal wheel 31. When the working vehicle 100 is hoisted on the track beam 200, the steering seat 322 is rotated about the second rotation axis 33 relative to the fixed seat 321 to drive the horizontal wheel 31 to rotate along the length direction of the working vehicle 1 relative to the mounting seat assembly 32, so as to adjust the position of the horizontal wheel 31, so that the working vehicle 100 does not interfere with the baffle 202 of the track beam 200.

In some embodiments of the present invention, the working vehicle 100 further includes a latch 34, the fixing base 321 is provided with a first through hole 3211 and a second through hole 3212, the steering base 322 is provided with a third through hole corresponding to the first through hole 3211 and a fourth through hole corresponding to the second through hole 3212, and the latch 34 is inserted into the first through hole 3211 and the third through hole or inserted into the second through hole 3212 and the fourth through hole to limit the horizontal wheel 31. When the working vehicle 100 is hoisted on the track beam 200, the steering seat 322 rotates around the second rotation shaft 33 relative to the fixed seat 321, so that the second through hole 3212 is aligned with the fourth through hole, the bolt 34 is penetrated into the second through hole 3212 and the fourth through hole, and the horizontal wheel 31 is prevented from deviating from the current position due to other factors such as gravity during hoisting, so that interference with the baffle 202 of the track beam 200 occurs; when the working vehicle 100 is lifted, the latch 34 is pulled out from the second through hole 3212 and the fourth through hole, so that the steering seat 322 rotates around the second rotation shaft 33 relative to the fixed seat 321, alignment of the first through hole 3211 and the third through hole is ensured, the latch 34 is inserted into the first through hole 3211 and the third through hole, and when the working vehicle 100 turns, the horizontal wheel 31 deflects in a direction away from the track beam 200 due to interaction of the horizontal wheel 31 and the track beam 200, so that the working vehicle 100 cannot turn.

In some embodiments of the present invention, rollover prevention device 12 is movable relative to work vehicle body 1 such that rollover prevention device 12 does not interfere with barrier 202 of track beam 200 by adjusting the position of rollover prevention device 12 when work vehicle 100 is suspended from track beam 200.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the description herein, reference to the terms "embodiment," "specific embodiment," "example," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (12)

1. A track beam work vehicle comprising:

a working vehicle body;

the running wheels are arranged on the operation vehicle body and are suitable for rolling along the running surface of the track beam;

a horizontal wheel assembly disposed on the work vehicle body adapted to roll along a side of the rail beam;

the first operation platform is positioned at the side of the track beam and connected to the first end part of the operation vehicle body in the width direction, and the bottom of the first operation platform is not lower than the bottom of the track beam;

the second working platform is connected with the first working platform and can move relative to the first working platform, so that the second working platform can be switched between a storage state and a working state;

when the second working platform is in the working state, the second working platform is positioned below the first working platform and at least partially positioned below the track beam;

when the second working platform is in the storage state, the projection of the second working platform and the lower structure of the bridge in the vertical direction is not overlapped.

2. The work vehicle of claim 1, wherein the second work platform is coupled to the first work platform by a first rotational axis, the work vehicle further comprising a lift assembly for rotating the second work platform about the first rotational axis relative to the first work platform to effect the transition of the second work platform between the stowed condition and the operative condition.

3. The work vehicle of claim 2 wherein said lifting assembly comprises a first hoist and a second hoist, said first hoist being connected to said second work platform by a first connecting line to a first connecting point, said second hoist being selectively connected to said second work platform by a second connecting line to a second connecting point, said second connecting point being spaced from said first connecting point along a width of said second work platform.

4. A work vehicle according to any of claims 1-3, wherein the first work platform comprises a guard rail and a pad, wherein the guard rail encloses a cavity open at both ends, the pad being configured to selectively open or close a lower end opening of the guard rail;

when the second working platform is in the working state, the base plate is arranged at a position for opening the lower end opening so that an operator can enter the second working platform from the first working platform.

5. The work vehicle of claim 4 wherein the number of pads is two, wherein at least one pad is rotatably mounted to the guard rail.

6. The work vehicle of claim 4, further comprising an access platform on the same side as the first work platform and connected to either one of the two ends in the longitudinal direction of the guard rail, the access platform being formed with a first opening toward the rail beam, the access platform being further formed with a second opening communicating with the upper end opening of the guard rail.

7. The work vehicle of claim 1, wherein a weight assembly for balancing the work vehicle is provided on a second end portion in a width direction of the work vehicle body.

8. The work vehicle of claim 1 or 7, further comprising an anti-rollover device adapted to be mounted on the work vehicle body at least partially below the deck of the rail beam.

9. The work vehicle of claim 1 wherein said level wheel assembly includes a level wheel and a mount assembly, said level wheel being connected to said work vehicle body by said mount assembly, and said level wheel being movable relative to said mount assembly.

10. The work vehicle of claim 9, wherein the mount assembly comprises a fixed seat and a steering seat, wherein the fixed seat is detachably connected to the work vehicle body, one end of the steering seat is connected to the fixed seat through a second rotating shaft, and the other end of the steering seat is connected to the horizontal wheel.

11. The working vehicle according to claim 10, wherein the fixing base is provided with a first through hole and a second through hole, the steering base is provided with a third through hole corresponding to the first through hole and a fourth through hole corresponding to the second through hole, and the steering base is inserted into the first through hole and the third through hole or the second through hole and the fourth through hole through a bolt to limit the horizontal wheel.

12. The work vehicle of claim 1, further comprising a brake assembly adapted to be mounted on either one of two ends of the work vehicle body in a length direction, the brake assembly comprising a link, both ends of the link being sequentially connected with a pressure handle, a telescopic rod, and a brake block, respectively;

when the operation vehicle brakes, the operator presses down the connecting rod, and drives the telescopic rod to move downwards through the pressure handle, so that the brake block clings to the running surface.