JP2016011211A - Vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle for high lift work which enables easy inspection, etc. of a lower part of a structure, such as a bridge, which has irregularities at its lower part.SOLUTION: A bridge inspection vehicle 1 includes: a travel body which includes a vehicle body 2 and is formed so as to travel; a boom 5 and a post 10 provided on the vehicle body 2; a main workbench 20 for loading an operator which is supported by the boom 5 and the post 10 and moved up and down by the boom 5 and the post 10; and a sub workbench unit 60 having a sub workbench for loading the operator which may be moved up and down. The main workbench 20 is formed into a long shape and the sub workbench unit 60 may be disposed in a given longitudinal position on the main workbench 20.

Description

  The present invention relates to an aerial work vehicle including an elevating device provided on a vehicle body and an operator boarding platform that is moved up and down by the elevating device.

  An example of such an aerial work vehicle is an aerial work vehicle called a bridge inspection vehicle or an overfence work vehicle. The bridge inspection car is a vehicle body that can be moved and moved, a boom that can freely move up and down, turn, and extend and retract, a post that can be flexed and extended at the tip of the boom, and a post that can freely expand and contract. It has a work table that is attached to the front end (lower end) so as to be always pivotable while maintaining horizontal. While extending the post in a substantially vertical direction and moving the work table horizontally with respect to the post, the work table is moved from the road above the bridge directly below the vehicle to check the lower part of the bridge, etc. It is comprised so that it can do. For example, in Patent Document 1 below, a bending post 6 is swingably provided at the tip of the boom 5, and a post 10 is provided at the tip of the bending post 6. A bridge inspection vehicle 1 configured with 20 is disclosed. The work table 20 of the bridge inspection vehicle 1 is configured to include a plurality of decks 21a, 21b, and 21c that can move relative to each other, and the work table area is obtained by relatively moving these decks 21a, 21b, and 21c and deploying them. Can be expanded.

Japanese Patent Laid-Open No. 2003-128392

  By the way, the inspection work for the lower part of the bridge is generally carried out visually by approaching the structure at the lower part of the bridge, but many of the bridges to be inspected have irregularities in the lower part in the structure. When inspecting the lower part (uneven portion) of a bridge having such a configuration from the lower surface side, structures that are convex when viewed from the lower surface side (for example, bridge girders) are inspected if the work table is approached from below. Work can be done. However, when inspecting a structure (for example, the bottom surface of a floor slab) existing in a concave area when viewed from the lower surface side at the lower part of the bridge, the convex structure viewed from the lower surface side interferes. There is a problem that the work table cannot be brought too close to the recessed area. That is, if the work table is moved up and brought closer to the recessed area, the work table may interfere with the convex structure as viewed from the lower surface, so the work table is placed in the recessed area. There is a problem that it is difficult to approach.

  The present invention has been made in view of such problems, and an aerial work vehicle capable of easily inspecting a lower part of a structure (for example, a bridge) having an uneven part on the lower part. The purpose is to provide.

In order to solve the above-described problem, an aerial work vehicle (for example, a bridge inspection vehicle 1 in the embodiment) according to the present invention includes a traveling body configured to travel with a vehicle body, and a main body provided on the vehicle body. Lifting device (for example, boom 5 and post 10 in the embodiment), a main work table for worker boarding supported by the main lifting device and moved up and down by the main lifting device, and lifting movement for worker boarding A sub workbench unit having a sub workbench capable, the main workbench is formed in an elongated shape, and the sub workbench unit is an arbitrary one in the longitudinal direction on the main workbench. Can be placed in position.

  In the above-described aerial work platform, the sub workbench unit is movable in the longitudinal direction on the main workbench, and moved in the longitudinal direction on the main workbench to move in the longitudinal direction on the main workbench. A configuration that can be arranged at an arbitrary position is preferable.

  In the above-described aerial work platform, the sub workbench unit includes a sub support device (for example, the slide support device 76 in the embodiment) that can be disposed at an arbitrary position in the longitudinal direction on the main work table, and the sub support. It is preferable that the apparatus includes a sub-lifting device (for example, the lifting device 71 in the embodiment) that is provided in the apparatus and moves the sub workbench up and down relative to the sub-supporting device.

  In the above-described aerial work vehicle, the sub workbench is formed in a rectangular box shape whose upper side is opened, and open parts opened in the longitudinal direction are formed on both side surfaces opposed to the longitudinal direction. It is preferable to have a configuration including an opening / closing member (for example, the left opening / closing door 66L and the right opening / closing door 66R in the embodiment) that can open and close the opening.

  In the above-described aerial work vehicle, it is preferable that the sub lifting device is provided on any side surface (for example, the front guard portion 64 in the embodiment) of the sub work table parallel to the longitudinal direction.

  In the above-described aerial work platform, the sub workbench unit is attached to a sub support device that can be arranged at an arbitrary position in the longitudinal direction on the main work table, and is attached to an upper part of the sub support device so as to be vertically rotatable. The sub work table, and the sub work table is rotated up and down with respect to the sub support device, so that the sub work table is placed on the sub support device, and It is also preferable that the structure can be moved up and down to an upward movement position located above the support device.

  In the above-described aerial work vehicle, the main lifting device includes a boom provided on the vehicle body so as to be able to move up and down, turn and extend, and extend and retract provided on the tip of the boom so as to be swingable up and down. A post that can move, and the post is maintained in a posture that extends substantially vertically when working at a high place and can be expanded and contracted downward, and the main work table is disposed at a lower end of the post in a posture that extends substantially vertically. It is good also as an attached structure.

  In the aerial work platform according to the present invention, the sub workbench unit can be arranged at an arbitrary position in the longitudinal direction on the main workbench, and the sub workbench can be moved up and down at the arrangement position. For this reason, when inspecting the lower part of a structure with unevenness in the lower part when inspecting the concave area when viewed from the lower surface side, the sub workbench unit is arranged near the lower area of the concave area when viewed from the lower surface side. Then, by raising the sub workbench of the sub workbench unit in this state, the sub workbench is brought close to the recessed area without causing the main workbench to interfere with the structure that is convex when viewed from the lower surface side. It becomes possible. Therefore, an operator who is on the sub workbench can easily approach the structure in the concave region when viewed from the lower surface side, and perform inspection or the like.

In the aerial work platform according to the present invention, when the sub workbench unit is configured to be movable in the longitudinal direction on the main workbench, it is easy to change the arrangement position of the sub workbench unit on the main workbench. Since it can be performed, work at high places can be performed efficiently. Further, when the sub workbench unit is configured to include a sub support device that can be arranged at an arbitrary position on the main work table and a sub lift device that moves the sub work table up and down, By placing the workbench unit (sub workbench) at an arbitrary position on the main workbench, and raising and lowering the sub workbench with the sub lift device at that position, the lower part of the structure with irregularities in the lower part In addition, the inspection can be easily performed.

  In addition, when the sub workbench is provided with opening / closing members that can open and close the opening on both side surfaces facing in the longitudinal direction, the sub workbench can be boarded on the sub workbench by closing the opening with the opening / closing member. The safety of the worker who moves up and down can be ensured. On the other hand, by opening the opening part, it is possible to move in the longitudinal direction on the main work table through the opening part (sub work table), so the work range (movement range) of the operator on the main work table Can also be secured.

  In the case where the sub lifting device is provided on any side surface parallel to the longitudinal direction of the sub work table, for example, the work of the main work table is compared with the configuration in which the sub lifting device is provided at the bottom of the sub work table. Since the step between the floor and the work floor of the sub workbench can be reduced, it is easy to get on and off the sub workbench. In this configuration, since the sub workbench can be lowered to a lower position, the upper part of the sub workbench protrudes upward from the main workbench when the sub workbench is lowered. A sub workbench unit that is not positioned can be configured.

  Further, a sub worktable unit is configured by attaching a sub worktable to the sub support device so as to be rotatable up and down, and a structure in which the sub worktable can be moved up and down by moving up and down is also preferable. It is possible to simplify the mechanism for moving the sub workbench up and down relative to the sub support device, and to reduce the weight of the sub workbench unit. For this reason, the sub worktable unit which can be easily moved in the longitudinal direction on the main worktable can be configured.

  Further, in the case of an aerial work vehicle including a main lifting device having a boom capable of moving up and down and a post capable of extending and retracting provided at the tip of the boom, for example, the traveling body is moved from the road above the bridge. By moving the main work table directly below (below the bridge), it becomes possible to inspect the lower part of the bridge.

It is a left view which shows the structure of the aerial work vehicle which concerns on this invention. It is the rear view which looked at the aerial work vehicle in the working state from the vehicle rear. It is an enlarged view of a main work bench. It is the enlarged view which looked at the sub worktable unit from diagonally. It is sectional drawing which shows the VV part in FIG. It is a block diagram which shows the control system of the said aerial work vehicle. It is a figure which shows the stowed state of the said aerial work vehicle, Comprising: (a) is a left view, (b) is a top view. It is a right view which shows the stowed state of the said aerial work vehicle. It is the rear view which looked at the main work bench in a working state from the vehicles back. It is the rear view which looked at the aerial work vehicle in the working state from the vehicle rear. It is the enlarged view which looked at the sub worktable unit concerning a modification from diagonally. It is a figure which shows the sub worktable unit which concerns on the said modification, Comprising: (a) is the figure seen from back, (b) is the figure seen from the left. It is a flowchart which shows the regulation control performed by the operation regulation part of a controller.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The configuration of a bridge inspection vehicle 1 as an example of an aerial work vehicle according to the present invention will be described with reference to FIGS. For convenience of explanation, the following explanation will be given by defining the arrow directions attached to each figure as front and rear, left and right, and up and down directions.

  The bridge inspection vehicle 1 has a driving cab 2a in the front, and is configured based on a truck chassis that can travel on front and rear tire wheels 3a and 3b. On the vehicle body 2 behind the driving cab 2a, a swivel base 4 is mounted so as to be able to swivel horizontally and is driven by a swivel motor 51 provided at the bottom of the swivel base 4. A boom 5 is pivotally connected to the upper part of the swivel base 4, and is swung up and down by a hoisting cylinder 52 that stretches between the swivel base 4 and the boom 5. The boom 5 includes a base end boom 5 a pivoted to the swivel base 4 and a front end boom 5 b that is telescopically inserted into the base end boom 5 a, and an extendable cylinder 53 attached to the inside of the boom 5. It is configured to be extendable.

  A bending / extending post 6 is pivotally connected to the tip of the tip boom 5b so as to be swingable up and down, and a link arm 7 is pivotally connected to the swinging axis of the bending / extending post 6. A rod-side end of a post-leveling cylinder 54 is pivoted to the upper end of the link arm 7, and a bottom-side end of the cylinder 54 is pivoted into the tip boom 5b. Further, the rod side end of the post hoisting cylinder 55 is pivotally connected to the lower end of the link arm 7, and the bottom side end of the cylinder 55 is pivotally connected to the lower part of the extension / retraction post 6. A post 10 is fixed to the front end of the bent post 6.

  The post hoisting cylinder 55 is expanded and contracted by an independent operation operation, and the bending / extending post 6 swings up and down with respect to the link arm 7 and the tip boom 5b, so that the post 10 can be set at a desired bending / extension angle position. For this reason, if necessary, the post 10 can be lifted to perform work at a high head. Note that the post 10 is held vertically as shown in FIGS. 1 and 2 when working at a normal low head. On the other hand, the bottom-side oil chamber of the post-leveling cylinder 54 and the rod-side oil chamber of the hoisting cylinder 52 are connected by an oil passage to constitute a so-called hydraulic circuit leveling mechanism, and the boom 5 is raised (falling down). When this occurs, the bending post 6 is tilted (raised) through the link arm 7 and the post hoisting cylinder 55 by the same angle as the hoisting angle of the boom 5, so that the post 10 is always operated regardless of the hoisting angle of the boom 5. It works to maintain a constant angle (so that the post 10 is always kept vertical during normal operation).

  The post 10 includes a holder 10h fixed to the bending / extending post 6, and a first post 10a, a second post 10b, a third post 10c, and a fourth post 10d that are telescopically inserted into the holder 10h. The first to fourth posts 10a to 10d can be expanded and contracted with respect to the holder 10h by a telescopic mechanism comprising a post elevating cylinder 56 stretched between the first post 10a and a chain loop disposed inside the post. It is configured. An arm 11 is pivotally connected to the tip of the fourth post 10d so as to be pivotable about an axis extending in the front-rear direction in the state shown in FIG. 1, and is driven by an arm pivot cylinder (not shown). Note that the turning operation (referred to as swinging) of the arm 11 is allowed only when the post 10 is in a horizontal state, and is specifically used when working at a high place or when storing the main work table 20 in the vehicle body 2.

  A pivot base 12 is pivotally connected to the tip of the arm 11 so as to swing up and down, and a work table leveling cylinder 57 is stretched between the base end of the arm 11 and the upper end of the pivot base 12. Yes. A work table bracket 13 that is driven by a work table turning motor 59 and is capable of turning is attached to the swivel base 12, and a base end is fixed to the lower end of the work table bracket 13. A main work table 20 is attached via an extendable beam 14 that can extend and retract in a direction orthogonal to the pivot axis of the bracket 13.

The operation of the work table leveling cylinder 57 is controlled by a so-called electric leveling device. That is, the work table leveling cylinder 57 is controlled in its expansion / contraction operation based on the detection signal of the inclination detector provided on the main work table 20, regardless of the undulation angle of the boom 5 or the bending / extension angle of the post 10. Leveling control is performed so that the main workbench 20 is always kept horizontal (so that the workbench bracket 13 always extends vertically). The specific operation is performed using the hydraulic pressure, and the leveling device controls the operation of the electromagnetic control valve to control the flow (supply direction and flow rate) of the hydraulic oil supplied to the worktable leveling cylinder 57. Is done. As a result, the main work table 20 is always supported horizontally with respect to the swivel base 12 regardless of the undulation angle of the boom 5 and the bending / extension angle of the post 10 and is supported by the swivel base 12 so as to be able to swivel horizontally.

  The telescopic beam 14 is composed of a base end beam 14a whose base end portion is fixed to the worktable bracket 13, an intermediate beam 14b telescopically inserted into the base end beam 14a, and a front end beam 14c. The telescopic cylinder 58 incorporated in the beam 14 is expanded and contracted, so that the intermediate beam 14b and the distal beam 14c can be expanded and contracted with respect to the proximal beam 14a.

  As shown in FIG. 3, the main work table 20 includes a proximal deck 21a attached to the proximal beam 14a, an intermediate deck 21b attached to the intermediate beam 14b, and a distal deck 21c attached to the distal beam 14c. These decks 21a, 21b, and 21c move relative to each other according to the expansion / contraction movement of the expansion / contraction beam 14, so that the worktable area can be expanded and reduced. The proximal deck 21a, the intermediate deck 21b, and the distal deck 21c each have a flat work floor 22a, 22b, 22c having a rectangular shape in plan view on which an operator is boarded, and are erected so as to surround the upper periphery of the work floor. It has handrails 23a, 23b, and 23c. In the present embodiment, the three-stage main work table 20 including the base end deck 21a, the intermediate deck 21b, and the front end deck 21c is illustrated. However, for example, the work table area is constant (a configuration that does not expand and contract). It may be a main workbench, a two-stage or a four-stage or more main workbench. Further, the enlargement / reduction direction of the main work table 20 corresponds to the “longitudinal direction” in the claims.

  Roller jacks 17 that can be expanded and contracted in the left and right directions of the vehicle body 2 and that can be expanded and contracted in the vertical direction are provided at four locations on the vehicle body 2. The roller jack 17 has an outrigger 17a that can be expanded in the left-right direction of the vehicle body, a jack 17b that can be expanded and contracted in the vertical direction, and a roller 17c that is attached to the lower end portion of the jack 17b and can roll in the vehicle longitudinal direction. As shown in FIG. 2, the roller 17c is grounded on the road surface, and the vehicle body can be moved forward and backward while stably supporting the vehicle body against the overturning moment acting on the vehicle body. Yes. Using the roller jack 17, the vehicle can be moved back and forth while maintaining a constant boom posture so that the work can be performed.

  The vehicle body 2 is provided with a roller jack operation device (not shown), and by operating this, the outrigger 17a can be operated to extend in the left-right direction, and the jack 17b can be expanded and contracted in the vertical direction.

  The bridge inspection vehicle 1 configured as described above is detachably mounted on the work floor of the main work table 20, and can be moved on the work floor in the expansion / contraction direction of the main work table 20. 60. The configuration of the sub workbench unit 60 will be described below with reference to FIGS. 4 and 5.

The sub workbench unit 60 includes a sub workbench 61 configured to allow an operator to board, a lifting device 71 provided on the front side of the sub workbench 61 for moving the sub workbench 61 up and down, A slide support device 76 provided on the lower side and movably supporting the sub work table 61 in the enlargement / reduction direction (left and right direction in FIG. 4) of the main work table 20 via the lifting device 71. The

  The sub workbench 61 includes a boarding space forming unit 62 that forms a worker boarding space G on which the worker is boarded, and a sub work in which a worker who has boarded the worker boarding space G performs an operation of moving the sub workbench 61 up and down. And a table lifting device 68. The boarding space forming part 62 has a flat work floor 63 having a rectangular shape in plan view on which an operator is boarded, a front guard part 64 that is formed in a flat plate shape and is erected on the front edge of the work floor 63, and has a frame shape. A rear guard portion 65 that is formed and is erected on the rear edge of the work floor 63, a right opening / closing door 66R that is swingably attached to the rear upper right portion of the front guard portion 64, and a rear guard. A left opening / closing door 66 </ b> L attached to the front upper left portion of the portion 65 so as to be swingable back and forth is configured. The work floor 63, the front guard portion 64, and the rear guard portion 65 form a worker boarding space G that is open on the left and right sides. The left and right open portions of the worker boarding space G are opened and closed. For this purpose, a right door 66R and a left door 66L are provided.

  The right opening / closing door 66R has an open position that extends to the left and right along the back surface of the front guard portion 64 as shown by a solid line in FIG. 4, and an operator boarding space G as shown by a two-dot chain line in FIG. It is swingable between a closed position that extends back and forth so as to close the right open portion, and is locked and held in an open position and a closed position by a locking member (not shown). Yes. The left open / close door 66L has an open position extending left and right along the front surface of the rear guard 65 as shown by a solid line in FIG. 4, and an operator boarding space G as shown by a two-dot chain line in FIG. It is swingable between a closed position that extends in the front-rear direction so as to close the left-side open portion, and is locked and held in an open position and a closed position by a locking member (not shown). ing.

  Therefore, the right opening door 66R and the left opening door 66L are locked and held in the open position while the sub workbench 61 is lowered, and the operator boarding space G is opened to the left and right as shown by the solid line in FIG. Thus, on the main work table 20, the worker can move through the sub work table unit 60 (worker boarding space G) to the left and right. Therefore, even when the sub workbench unit 60 is mounted on the main workbench 20, a work area (worker movement area) on the main workbench 20 can be secured.

  A right brake release lever 67R that can be gripped is provided at the upper right corner of the rear guard 65, and a left brake release lever 67L that can be gripped is provided at the upper left corner of the rear guard 65.

  The sub workbench elevating device 68 is provided on the front upper portion of the front guard part 64, and is configured to be tiltable back and forth from the neutral position, and performs the operation of moving the elevating device 71 up and down. And a lifting / lowering stop button 70 configured to be capable of pressing operation and stopping the lifting / lowering operation of the lifting / lowering device 71. Details of the right brake release lever 67R, the left brake release lever 67L, the work platform elevating operation lever 69, and the elevating stop button 70 will be described later.

  The sub workbench 61 configured as described above is moved up and down by the lifting device 71 with respect to the floor surface on which the sub workbench unit 60 is placed (work floor of the main workbench 20). The lifting device 71 is provided on the front side of the sub workbench 61 (front guard part 64), and is lifted below the first mast 72, the second mast 73, the third mast 74, and the sub workbench lifting device 68. And a sub worktable elevating cylinder 75 disposed in a telescopic manner.

The first mast 72 includes a pair of left and right rail members 72r and 72r having a concave cross section opened in the left and right inner sides and extending vertically, and a first connecting member that connects the left and right first rail members 72r and 72r (
(Not shown). The second mast 73 includes a pair of left and right second rail members 73r and 73r that have a concave cross section that is open to the inside on the left and right sides and that are disposed on the left and right sides of the first rail members 72r and 72r and extend vertically. A second connecting member (not shown) that connects the second rail members 73r and 73r, and a second slider (not shown) that is attached to the left and right outer surface portions of the second rail members 73r and 73r and protrudes left and right. Consists of The third mast 74 is attached to the front surface of the front guard portion 64 and extends vertically on the left and right inner sides of the second rail members 73r and 73r, and a pair of left and right third rail members 74r and 74r and third rail members 74r and 74r. It is comprised from the 3rd slider (not shown) which is attached to the left-right outer surface part, and protrudes on the left-right outer side. In the present embodiment, a configuration in which the front guard part 64 and the third rail members 74r and 74r are integrally formed is shown.

  Here, the assembly configuration of the first to third masts will be described. By fitting the second slider of the second mast 73 slidably up and down into the recess formed in the first rail member 72 r of the first mast 72, the second mast 73 is attached to the first mast 72. It is assembled so that it can slide up and down. Further, by fitting the third slider of the third mast 74 slidably up and down into the recess formed in the second rail member 73r of the second mast 73, the third mast 73 is fitted to the second mast 73. 74 is assembled to be slidable up and down. In this state, the sub worktable elevating cylinder 75 is mounted across the first connecting member of the first mast 72 and the second connecting member of the second mast 73, and straddles the first mast 72 and the third mast 74. A chain (not shown) for moving the third mast 74 up and down is attached. One end of this chain is attached to the first mast 72, and the chain is wrapped around a sprocket (not shown) attached to the second mast 73 at an intermediate portion, and the other end is attached to the third mast 74. It has been.

  For this reason, by operating the sub worktable elevating cylinder 75 to extend, the second and third masts 73 and 74 are slid upward (elongated) with respect to the first mast 72 and integrated with the third mast 74. The sub workbench 61 can be raised. On the other hand, the sub workbench elevating cylinder 75 is contracted to slide the second and third masts 73 and 74 downward (reduction operation) with respect to the first mast 72, and the sub workbench 61 is lowered. be able to.

  The slide support device 76 supports the sub work table 61 movably in the enlargement / reduction direction of the main work table 20 through the lifting device 71 configured as described above. As shown in FIG. 5, the slide support device 76 includes a support frame 77 provided below the work floor 63 and attached to the first mast 72, and a main work table at four positions on the front, rear, left and right of the support frame 77. The four slide rollers 78 that are rotatably mounted in the enlargement / reduction direction 20 and a brake device (not shown) that restricts rotation by applying a braking force to the slide rollers 78 are configured. As shown in FIG. 4, the sub worktable unit 60 is mounted on the main worktable 20 in a state where the four slide rollers 78 of the slide support device 76 are placed on the work floor of the main worktable 20. The brake device of the slide support device 76 is connected to each of the right brake release lever 67R and the left brake release lever 67L described above by wires, and slides in a state where the right brake release lever 67R or the left brake release lever 67L is not operated. The roller 78 is configured as a negative brake that applies a braking force.

For this reason, in a state where neither the right brake release lever 67R nor the left brake release lever 67L is gripped, the rotation of the slide roller 78 is restricted by the brake device, so that the sub that uses the rotation of the slide roller 78 is used. Movement of the workbench unit 60 to the left and right is restricted. On the other hand, when the right brake release lever 67R or the left brake release lever 67L is gripped, braking of the slide roller 78 by the brake device is released, and the sub worktable unit 60 is moved to the left and right using the rotation of the slide roller 78. It can be in a possible state. Therefore, when the sub workbench unit 60 moves to the left or right on the main workbench 20, first, the slide roller 78 is made to be rotatable by grasping and operating the right brake release lever 67R or the left brake release lever 67L. This can be done by pushing or pulling the sub workbench unit 60 to the left or right while holding and operating. Since the sub worktable unit 60 is located between the pair of front and rear handrails 23a (23b, 23c) with a clearance in the front and back on the main worktable 20, it is guided by the handrails 23a (23b, 23c). To move left and right.

  Instead of the slide roller 78, other means for sliding the sub workbench unit on the work floor of the main workbench 20 in the enlargement / reduction direction (longitudinal direction) may be used.

  As can be seen from FIG. 5, by providing the lifting device 71 on the side surface side (front surface side in this example) of the sub workbench 61, the following effects can be obtained. First, as compared with the configuration in which the lifting device is provided on the lower surface side of the sub work table 61, the work floors 22a, 22b, 22c of the main work table 20 and the work floor 63 of the sub work table 61 are equivalent to the lifting device. Therefore, it is easy to get on and off the sub workbench 61. Second, as compared with the configuration in which the lifting device is provided on the lower surface side of the sub workbench 61, the sub workbench 61 can be lowered to a lower position, so that the vertical dimension of the sub workbench 61 is secured. However, when the sub workbench 61 is lowered, the sub workbench unit 60 is such that the upper part of the sub workbench 61 does not protrude from the main workbench 20 (handrails 23a (23b, 23c)). Can be configured.

  A hook 79 is attached to the upper portion of the rear guard portion 65 and the upper portions of the first rail members 72r and 72r. For this reason, when the sub workbench unit 60 is lifted and mounted on the work floor of the main workbench 20 using a crane or the like, the sub workbench unit 60 mounted on the work floor of the main workbench 20 is lifted and main. When lifting from the work table 20, the sub work table unit 60 can be easily lifted by lifting using the hook 79.

  Next, the control unit 100 mounted on the bridge inspection vehicle 1 configured as described above will be described.

  As shown in FIG. 6, the control unit 100 includes an upper operation device 18, a lower operation device 31, a sub work table elevating device 68, a right door open / close detector 32 </ b> R, a left door open / close detector 32 </ b> L, an elevating detector 169, a slide position. A detector 129, a controller 40, a main hydraulic unit 80, and a sub hydraulic unit 90 are configured. The elevation detector 169 and the slide position detector 129 are used for control using the operation restricting unit 43 of the controller 40, and these descriptions will be described later, including the control explanation by the operation restricting unit 43. Further, in the following, actuators for moving the main work table 20, etc., that is, a turning motor 51, a hoisting cylinder 52, a telescopic cylinder 53, a post hoisting cylinder 55, a post lifting cylinder 56, a main work base telescopic cylinder 58, and The main workbench turning motor 59 will be collectively referred to as “main actuator 81”.

  The upper operating device 18 swings the swivel 4, raises and retracts the boom 5, stretches and retracts the bending post 6, extends and retracts the post 10, swings the worktable bracket 13, and the main work table 20. And an operation lever for performing an operation of enlarging / reducing, and provided on the base end deck 21a of the main work table 20 (see FIG. 3). The upper operation device 18 sends an operation signal corresponding to the operation of the operation lever or the like to the controller 40.

The lower operation device 31 includes an operation lever or the like that performs an operation of turning the swivel 4 in the same manner as the upper operation device 18, and is provided in the vehicle body 2. The lower operation device 31 sends an operation signal corresponding to the operation of the operation lever or the like to the controller 40.

  The sub workbench elevating device 68 is composed of the sub workbench elevating operation lever 69 and the elevating stop button 70 as described above, and sends operation signals corresponding to these operations to the controller 40.

  The right door opening / closing detector 32R and the left door opening / closing detector 32L are detectors provided in the sub workbench unit 60, respectively, for detecting that the right opening door 66R and the left opening door 66L are in the closed position. A detection signal corresponding to the result is sent to the controller 40. The right door opening / closing detector 32R and the left door opening / closing detector 32L are configured using, for example, limit switches.

  The main hydraulic unit 80 is mounted on the vehicle body 2, and includes a main electromagnetic control valve V1 that performs control for supplying hydraulic oil to the main actuator 81, a main tank T1 that stores hydraulic oil, and hydraulic oil for the main tank T1. And a main hydraulic pump P1 that discharges the gas to the main electromagnetic control valve V1.

  The sub hydraulic unit 90 is a hydraulic unit that supplies hydraulic oil to the sub worktable elevating cylinder 75, and is configured as a hydraulic unit different from the main hydraulic unit 80 that supplies hydraulic oil to the main actuator 81. The sub hydraulic unit 90 includes a sub electromagnetic control valve V2 that performs control to supply hydraulic oil to the sub worktable lifting cylinder 75, and an amount necessary to extend and contract the sub worktable lifting cylinder 75 (a smaller amount than the main tank T1). ), The sub hydraulic pump P2 that sucks up the hydraulic oil in the sub tank T2 and discharges it to the sub electromagnetic control valve V2, and the electric motor M that drives the sub hydraulic pump P2. . As described above, the main hydraulic unit 80 is mounted on the vehicle body 2, while the sub hydraulic unit 90 is detachably mounted on the main work table 20 (the base end portion of the work floor 22a). For this reason, when performing work that does not require the sub workbench unit 60, the sub workbench unit 60 and the sub hydraulic unit 90 are lowered from the main workbench 20 to load the main workbench 20 by the weight of these units. You can earn a load.

  The sub work table unit 60 may be integrated with the sub hydraulic unit 90, and the unit having the integrated structure may be slid right and left. If comprised in this way, what is necessary is just to provide the hydraulic piping which connects the sub worktable unit 60 (sub worktable raising / lowering cylinder 75) and the sub hydraulic pressure unit 90 (sub electromagnetic control valve V2) in the sub worktable unit 60. There is no need to dispose on the main workbench 20, and the work floor of the main workbench 20 can be simplified.

  The controller 40 includes a valve control unit 41, an interlock control unit 42, and an operation restriction unit 43. The valve control unit 41 outputs a command signal corresponding to the operation signal input to the controller 40 to the main hydraulic unit 80 (main electromagnetic control valve V1) and the sub hydraulic unit 90 (sub electromagnetic control valve V2), thereby Control is performed to supply hydraulic oil to the side actuator 81 and the sub worktable elevating cylinder 75. Specifically, by outputting a command signal corresponding to the operation signal from the upper operating device 18 and the lower operating device 31 to the main electromagnetic control valve V1, the hydraulic oil sucked up from the main tank T1 by the main hydraulic pump P1 is obtained. Control to be supplied to the main actuator 81 is performed. On the other hand, by outputting a command signal corresponding to the operation signal from the sub workbench lifting / lowering operation lever 69 to the sub electromagnetic control valve V2, the hydraulic oil sucked up from the subtank T2 by the sub hydraulic pump P2 is sublimated. Control to supply to. The operation restricting unit 43 will be described later.

  The interlock control unit 42 performs interlock regulation that regulates the operation commanded by the sub worktable lifting / lowering operation lever 69 based on detection signals from the right door opening / closing detector 32R and the left door opening / closing detector 32L. Specifically, based on detection signals from the right door open / close detector 32R and the left door open / close detector 32L, it is determined that at least one of the right open door 66R and the left open door 66L is not in the closed position. In this case, a restriction signal is output to the valve control unit 41. While receiving this regulation signal, the valve control unit 41 regulates the output of the command signal to the sub electromagnetic control valve V2 regardless of the operation of the sub worktable lifting / lowering operation lever 69 that raises the sub worktable 61. Thereby, the raising / lowering operation of the lifting / lowering device 71 in a state where at least one of the right opening / closing door 66R and the left opening / closing door 66L is not located at the closed position is restricted. As a result, the sub workbench 61 is allowed to be lifted only when the left and right sides of the sub workbench 61 (worker boarding space G) are surrounded by the right door 66R and the left door 66L. The safety of workers who perform It should be noted that this restriction is released when both the right opening / closing door 66R and the left opening / closing door 66L are located at the closed positions and the detection signals corresponding thereto are input.

  In the present embodiment, an example is shown in which the lifting operation of the lifting device 71 is restricted by the interlock restriction, but the lowering operation of the lifting device 71 is not restricted, but instead of this structure, the lifting device is restricted by the interlock restriction. It is good also as a structure by which both the raise operation | movement of 71 and a downward movement are controlled.

  When an operation signal from the lift stop button 70 is input, the controller 40 regulates the operation commanded by the sub workbench lift control lever 69 regardless of the operation of the sub workbench lift control lever 69 and lifts and lowers the device 71. The lifting / lowering operation of is stopped.

  With the control unit 100 configured as described above, an operator who rides on the main work table 20 operates the upper operation device 18 to turn the swivel table 4 in a desired direction, turn the boom 5 up and down, and extend and retract. The bending post 6 can be moved together with the main work table 20 by moving up and down (bending and stretching), the post 10 extending and contracting, and the worktable bracket 13 turning. Further, when the main work table 20 is expanded as necessary, a walkway extending in the enlargement direction is formed, so that the worker can move to a desired work place through the walkway. Further, the worker who is on the main workbench 20 moves the sub workbench unit 60 in the enlargement / reduction direction of the main workbench 20 so as to be positioned below the desired work place. By boarding and operating the sub workbench lifting / lowering operation lever 69, the main workbench 20 can be moved up and down together with the sub workbench 61 and moved to a desired work place.

  In the bridge inspection vehicle 1 as described above, the upper operation device 18 and the driving cab 2a are provided with a communication device including a microphone and a speaker. Therefore, as shown in FIG. 2, the work on the main work table 20 is performed using the communication device in a state where the main work table 20 is positioned below the bridge B (left bridge portion BL) across the outer fence F1. The operator can instruct the other workers in the driving cab 2a to move and move the vehicle, so that repair / inspection work for the lower part of the bridge B can be continuously performed.

As shown in FIGS. 7 and 8, the bridge inspection vehicle 1 configured to be able to repair and inspect bridges and the like in this way has the boom 5, the post 10, the main work table 20, etc. on the vehicle body 2. In the stored state, the vehicle travels on the road with the front and rear tire wheels 3a, 3b and moves to the work site. In this retracted state, the boom 5 extends substantially back and forth along the vehicle body 2 and is lying down and stored, and the post 10 is swung so as to be bent up to nearly 180 degrees with respect to the boom 5. The boom 5 is stored extending in parallel so as to overlap vertically. The main work table 20 is stored in a position so as to overlap the left and right sides of the boom 5 and the post 10.

  Next, the operation of the bridge inspection vehicle 1 will be described. If the bridge inspection vehicle 1 is used, for example, in a bridge B such as a river bridge or a viaduct as shown in FIG. 2, it is possible to repair and inspect the side and lower portions of the bridge B and the outer fence F1. In the following, the operation when the main work table 20 is moved to the lower part of the bridge B and the inspection work for the lower part of the bridge B is performed will be described with reference to FIG. 9 and FIG. explain.

  9 and 10 show cross-sectional views of the bridge B to be inspected, and the bridge B is configured to have a left bridge portion BL and a right bridge portion BR arranged side by side. The left bridge portion BL and the right bridge portion BR are respectively a floor slab S that supports a road surface, a bridge girder K that is located below the floor slab S and supports the floor slab S from below, and left and right outer ends of the floor slab S The outer fence F1 provided in the part and the inner fence F2 provided at the left and right inner ends of the floor slab S are provided. Below, the case where inspection work is performed about the whole lower part of the left bridge part BL is demonstrated.

  When the inspection work for the lower part of the left bridge portion BL is performed using the bridge inspection vehicle 1, first, the road traveling operation is performed from the operation cab 2a, and the bridge inspection vehicle 1 is moved onto the left bridge portion BL which is a work site. When traveling on the road, the boom 5, the post 10, and the main work table 20 are stored. As shown in FIG. 2, the bridge inspection vehicle 1 is moved and stopped so as to be substantially parallel to the outer fence F1. Subsequently, after the outriggers 17a and 17a arranged on the outer fence F1 side (left side in FIG. 2) projecting to the left, the four jacks 17b are extended downward so that the tire wheels 3a and 3b are in a grounded state ( The vehicle is supported by the four rollers 17c in a state in which a ground reaction force capable of traveling is applied.

  Then, the operator gets on the main work table 20 and operates the upper operation device 18 to turn, move up and down and extend the boom 5, and attach it to the post 10 attached to the holder 10 h and the tip of the post 10. The main work table 20 thus moved is moved outside over the outer fence F1. Subsequently, the holder 10h is swung up and down to bring the post 10 into a vertical state, and then the post 10 is extended to move the main work table 20 to a height position that does not interfere with the bridge girder K as shown in FIG. Lower. Then, after the main work table 20 in the fully contracted state is horizontally turned so as to extend toward the vehicle side (right side in FIG. 2) with respect to the post 10, an intermediate deck is set according to the left and right width of the left bridge portion BL as necessary. 21b and the tip deck 21c are slid to the right to enlarge the work table area, and the lower bridge part BL is inspected.

  In general, the inspection work for the lower part of the bridge is performed by visual observation when an operator approaches the lower part of the bridge (floor slab S or bridge girder K). For this reason, as shown in FIG. 9, if the main work table 20 is brought close to the lower part of the bridge girder K in the vertical direction, the worker moves in the left-right direction on the main work table 20 (work floors 22a, 22b, 22c). However, the lower part of the bridge girder K can be inspected. However, the left and right side surfaces of the bridge girder K (particularly the upper part of the side surface) and the lower surfaces of the left and right floor slabs S of the bridge girder K are separated upward from the main work table 20, and the main work table 20 is further raised from the state shown in FIG. Since the main work table 20 may interfere with the bridge girder K, there is a problem that these inspections are difficult.

Therefore, the sub worktable unit 60 is used in such a case. For example, when inspecting the lower surface of the floor plate S located on the left side of the bridge girder K, the sub workbench unit 60 is moved to the left and right with the right brake release lever 67R or the left brake release lever 67L being gripped and released. It is moved near the lower part of the floor slab S to be inspected (position 60A in FIG. 10). Then, the operator gets on the sub workbench 61, swings the right door 66R and the left door 66L back and forth to be locked and held at the closed position, and operates the sub workbench elevating operation lever 69 to operate the subwork. Raise the platform 61. As a result, the operator can move up with the sub workbench 61 and approach the lower surface of the floor slab S to be inspected, and can inspect the lower surface of the floor slab S located on the left side of the bridge girder K. . At this time, the left side of the bridge girder K can also be inspected. When the inspection work is finished, the operator can descend from the sub work table 61 onto the main work table 20 (work floors 22a, 22b, 22c) by lowering the sub work table 61.

  In the same manner as the inspection work of the side surface of the bridge girder K on the left side of the bridge girder K and the lower surface of the floor slab S, the inspection work of other inspection points such as the side surface of the bridge girder K on the right side of the bridge girder K and the lower surface of the floor slab S should be performed. Can do. As described above, according to the bridge inspection vehicle 1, the left work bridge unit 60 is moved without moving the main work table 20 by moving the sub work table unit 60 left and right and moving the sub work table 61 up and down on the main work table 20. The inspection work for the area below the main work table 20 at the lower part of the BL can be easily performed.

  When the inspection work for the lower part of the right bridge part BR is to be performed, the bridge inspection vehicle 1 is moved from the left bridge part BL to the right bridge part BR to be inspected, stopped, and stopped. The inspection work for the lower part of the right bridge BR is performed in the same way as the inspection.

  Next, a sub workbench unit 160 as a different embodiment of the sub workbench unit 60 will be described with reference to FIGS. 11 and 12. The sub workbench unit 160 is characterized in that the mechanism for moving the sub workbench up and down is simplified compared to the sub workbench unit 60. The main work table 20 is detachably mounted on the table 20 and can be moved in the enlargement / reduction direction.

  As shown in FIGS. 11 and 12, the sub workbench unit 160 is formed in an L shape in a side view from the front, and is placed on the main workbench 20 (work floors 22a, 22b, 22c). The platform support portion 161 and a sub work platform 170 formed in a substantially rectangular parallelepiped frame shape and supported by the work platform support portion 161 are configured. As will be described later, the sub workbench unit 160 is configured to rotate the sub workbench 170 with respect to the workbench support part 161 to move up and down, and FIG. 11 shows a state in which the sub workbench 170 is lowered. Show.

  The worktable support part 161 is formed in a rectangular frame shape and is placed on the work floor 22a (22b, 22c) and above the right front corner part and the right rear corner part of the support frame part 162. It is comprised from the support pillar part 163,163 extended in this. The sub workbench unit 160 is lifted and moved on the main workbench 20 in the longitudinal direction. For example, the workbench support unit 161 is attached with a slide roller 78 or other means to be moved by sliding. The base unit 160 may be slid on the main work table 20 and moved in the longitudinal direction.

  In the lowered state shown in FIG. 11, the sub workbench 170 has a workbench main body 171 formed in a substantially rectangular parallelepiped frame shape, and engagements attached to the front and rear end portions of the lower right corner of the workbench main body 171. It comprises members 173 and 173 and a plate-like floor board member 174 located at the bottom of the workbench main body 171 and covering the bottom.

In the state shown in FIG. 11, the left and right side portions of the work table main body 171 have openings through which the operator can pass left and right, so that the operator can perform sub work on the main work table 20. The table unit 160 (sub work table 170) can be moved by passing left and right. A rotation support portion 172 that extends to the right as a pair of front and rear ends at the front and rear ends of the upper right corner of the workbench main body 171 and is pivotally connected to the upper portion of the support column portion 163 by a pivot pin (not shown). , 172 are provided. By rotating the upper part of the support column part 163 and the rotation support part 172 using a pivot pin, the sub work platform 170 extends forward and backward relative to the work table support part 161 and passes through the pivot pin. It is attached so that it can rotate up and down around L1. As a result, the sub workbench 170 is lowered as shown in FIG. 11 and rotated upward about the rotation axis L1 from the downward movement position placed on the support frame portion 162, as shown in FIG. It can be rotated and moved to the upward movement position located on the upper part of the support column part 163.

  In the state shown in FIG. 11, the rotation engaging member 173 includes a base 173a attached to the work table main body 171 so as to be rotatable about a vertically extending rotation shaft (not shown), a front and rear outer side from the base 173a, and It is comprised from the engaging part 173b extended rightward. The rotation engagement member 173 is biased in a direction of rotation toward the front and rear and outside, and a rotation position where the engagement portion 173b can be engaged with the handrails 23a (23b, 23c) vertically by a stopper (not shown). Retained. Therefore, when the sub workbench 170 is rotated upward from the state shown in FIG. 11, the engaging portion 173 b comes into contact with the handrail 23 a (23 b, 23 c) from below, and the front and rear against the urging force. Rotate inward. When the sub workbench 170 is raised to a position where the contact with the handrail 23a (23b, 23c) is released, the engaging portion 173b of the rotary engagement member 173 is biased by the handrail 23a (23b, 23c). And return to the engageable rotational position. When the sub workbench 170 is lowered in this state, the engaging part 173b is vertically engaged so as to be placed on the handrail 23a (23b, 23c), and the sub workbench 170 with respect to the workbench support part 161. Is held in a state where it is lifted upward as shown in FIG.

  The main work table 20 is configured by nesting a base end deck 21a, an intermediate deck 21b, and a front end deck 21c, and a pair of front and rear handrails 23a, 23b, 23c is interposed between the decks 21a, 21b, 21c. The front-rear interval is different. Therefore, the rotation engagement member 173 is configured to be vertically engaged with any of the handrails 23a, 23b, and 23c at a rotation position held by a stopper (not shown).

  In the state shown in FIG. 11, the floor plate member 174 is attached to the work table main body 171 so that the right end portion thereof can be rotated up and down around a rotation axis L <b> 2 extending in the front and rear direction. For this reason, in the state shown in FIG. 11, from the rotation position covering the bottom of the work table main body 171, it is rotated upward about the rotation axis L 2 and rotated to the rotation position covering the right side of the work table main body 171. be able to. Further, the floor plate member 174 has a structure in which the base end side floor plate 175 and the front end side floor plate 176 are divided into two and hinged, and the front end side floor plate 176 is expanded with respect to the base end side floor plate 175. (Refer to FIG. 11), the front end side floor plate 176 can be overlapped with the base end side floor plate 175 and folded.

  Next, how to use the sub workbench unit 160 configured as described above will be described with reference to FIG. In the following, since the sub workbench unit 160 is stored and placed on the main workbench 20 as shown in FIG. 11, the work is performed using the sub workbench unit 160 as shown in FIG. An example will be described.

  First, the sub workbench unit 160 is moved left and right on the work floors 22a, 22b, and 22c, and is positioned near the lower part of the work object. FIG. 12 (a) shows two sub workbench units 160 arranged on the left and right, but for ease of explanation, the sub workbench 170 is lowered and positioned at the lower position ( The state shown on the left side) and the state where it is rotated and moved to the up position (state shown on the right side) are only shown in the same figure. There are only 160. The sub workbench unit 160 is normally moved left and right on the work floors 22a, 22b, and 22c while being lowered as shown on the left side of FIG.

After the sub workbench unit 160 is moved to the vicinity below the work object, the sub workbench 170 is rotated upward about the rotation axis L1 to lift the sub workbench 170 upward (in the direction of the rotation direction R1). It engages with the handrail 23a (23b, 23c) up and down. As a result, FIG.
As shown on the right side of (a), the sub workbench 170 is locked and held in the lifted state. FIG. 12B shows the lifted sub work table 170 from the left. In the lifted state, the load of the sub work table 170 is distributed and supported by the rotation engaging member 173 (handrail) and the work table support portion 161 (work floor). For this reason, although the strength of the handrail 23a (23b, 23c) is required, it is possible to reduce the strength of the worktable support portion 161 and to constitute a lightweight sub worktable unit.

  After the sub workbench 170 is rotated upward and held in the lifted state in this way, the floor board member 174 is rotated downward (in the direction of the rotation direction R2) about the rotation axis L2, and the workbench main body portion 171 is rotated. Position to cover the bottom. At this time, the front end side floor plate 176 is overlapped with the base end side floor plate 175, and a region penetrating vertically is provided at the bottom of the lifted sub workbench 170. By doing so, the worker can ascend as shown by the arrow H in the vertically penetrating region and can board the sub work table 170. Then, after the operator gets on the sub workbench 170, the front-end floor plate 176 is unfolded and positioned so as to cover the bottom of the lifted sub workbench 170. As described above, when the operator gets on the lifted sub workbench 170, the work on the work object can be performed at a position higher by the vertical height of the support column part 163.

  The sub workbench unit 160 configured as described above does not require the sub workbench lifting device 68 as compared with the sub workbench unit 60 according to the first embodiment shown in FIG. The mechanism for moving up and down can be simplified to reduce the weight of the sub workbench unit 160 as a whole. Since it is lightweight, there is an advantage that the sub workbench unit 160 can be easily moved in the longitudinal direction on the main workbench 20.

  Further, since the work table main body 171 of the sub work table 170 is formed in a substantially rectangular parallelepiped frame shape, the sub work table 170 is lowered in the state where the sub work table 170 is lowered as shown on the left side of FIG. 11 and FIG. The construction allows the operator to pass left and right through the inner space. For this reason, in a state where the sub workbench unit 160 is placed on the main workbench 20, the worker can freely move on the main workbench 20 in the enlargement / reduction direction.

  When the work on the work target is completed and the sub workbench 170 in the lifted state (upward movement position) is lowered and returned to the original state (downward movement position), the sub workbench 170 is first rotated. Lift in the direction of direction R1. In this state, the rotary engagement member 173 is rotated and held in the front and rear sides so as to pass up and down without engaging with the handrail 23a. And it can return to the original downward movement position shown in FIG. 11 by rotating in the direction opposite to the rotation direction R1 while supporting the sub workbench 170.

  In the above description, the sub workbench units 60 and 160 configured to move in the longitudinal direction on the work floor of the main workbench 20 are illustrated, but instead, the sub workbench unit can be attached to and detached from the main workbench 20. The sub workbench unit may be arranged at an arbitrary position on the work floor of the main workbench 20.

By the way, when the sub workbench unit 60 (160) is mounted on the main workbench 20 and the sub workbench 61 (170) is raised to perform the work, the upper operation device 18 or the lower operation device 31 is operated. It is not preferable that the main workbench 20 is lifted or retracted in the longitudinal direction from the standpoint of stability during work, and the sub workbench 61 (170) and the worker on the main workbench 20 are not intended. On the contrary, it is not preferable because it may approach the work object. Further, as shown in FIG. 3, in the main work table 20 configured by combining the base end deck 21a, the intermediate deck 21b, and the front end deck 21c in a nested manner, when this is extended and contracted, the sub work table unit 60 ( 160) may be moved to a different deck, which is not preferable. For example, when the main workbench 20 is reduced in a state where the sub workbench unit 60 (160) is placed on the intermediate deck 21b, the sub workbench unit 60 (160) rides on the front deck 21c. It becomes a state. At this time, since there is a step between the intermediate deck 21b and the front end deck 21c in the nesting type structure, the sub workbench unit 60 (160) comes into contact with the step or gets over the step. It is not preferable in terms of the aspect.

  Therefore, as described above, the controller 40 includes the operation restricting portion 43 so as to avoid the occurrence of such an undesirable situation (see FIG. 6). The operation restriction control by the operation restriction unit 43 will be described below. In order to perform this operation restriction control, the controller 40 receives signals from the elevation detector 169 attached to the sub worktable unit 60 (160) and the slide position detector 129 attached to the main worktable 20. Entered.

  The lift detector 169 is a detector that is attached to the sub workbench unit 60 (160) and detects the lift state of the sub workbench 61 (170) with respect to the slide support device 76 (workbench support unit 161). Consists of limit switches. The elevation detector 169 detects whether the sub worktable 61 (170) is in the lowered position or the raised position with respect to the slide support device 76 (worktable support section 161), and the detection signal is sent to the controller 40. To send. In this position detection, a plurality of limit switches may be provided along the height position to detect the lift position of the sub workbench 61 (170) in stages, or the lift position may be detected continuously. Anyway.

  The slide position detector 129 includes, for example, a non-contact switch attached to the vicinity of the work floor on the front and rear sides of the base deck 21a, the intermediate deck 21b, and the front deck 21c, and is the main of the sub worktable unit 60 (160). A position in the left-right direction (deck slide direction) on the work table 20 is detected. The slide position detector 129 is not limited to a non-contact type switch, but may be of any type such as a contact type switch such as a limit switch, and the left and right sides on the main work table 20 of the sub work table unit 60 (160). Any device can be used as long as the position in the direction (deck slide direction) can be detected.

  The operation restriction control performed by the operation restriction unit 43 provided in the controller 40 will be described with reference to the flowchart of FIG.

  First, in step S10, the detection signal sent from the elevation detector 169 is input and the detection signal sent from the slide position detector 129 is input, and the process proceeds to step S20.

  In step S20, based on the detection signal from the elevation detector 169, it is determined whether or not the sub workbench 61 (170) is located at the raised position. Here, when it is determined from the detection signal of the lift detector 169 that the sub workbench 61 (170) is raised, the process proceeds to step S21. As described above, since it is not preferable to move the main work table 20 while the sub work table 61 (170) is raised, operation restriction by the operation restriction unit 43 is performed in step S21. Specifically, even if the upper operating device 18 and the lower operating device 31 are operated to raise the main workbench 20 or extend and contract in the longitudinal direction, control is performed to restrict the operation based on this operation. Is called. In addition to (or instead of) the restriction of the operation for moving the main work table 20, an alarm operation using, for example, a warning sound or a warning light may be performed.

On the other hand, in step S20, the sub workbench 61 is detected from the detection signal from the lift detector 169.
When it is determined that (170) is in the lowered position, the process proceeds to step S30. At this time, since the sub workbench 61 (170) is on the main workbench 20, control for restricting the reduction operation of the main workbench 20 is performed according to the position of the sub workbench 61 (170). For this reason, in step S30, based on the detection signal sent from the slide position detector 129, it is determined whether or not the sub workbench unit 60 (160) is positioned on the front end deck 21c. Here, if it is determined that the position is located on the front end deck 21c, there is no problem even if the expansion / contraction operation of the main workbench 20 is permitted. Therefore, the control proceeds to RETURN without performing the restriction control, and proceeds to the next control flow.

  On the other hand, when it is determined in step S30 that the sub workbench unit 60 (160) is not located on the front end deck 21c (that is, the sub workbench unit 60 (160) is located on the base deck 21a or the intermediate deck 21b). If it is determined, the process proceeds to step S31. When the sub workbench unit 60 (160) is positioned on the base deck 21a or the intermediate deck 21b, the sub workbench unit 60 (160) is moved to the intermediate deck 21b or the front deck when the main workbench 20 is reduced. Since there is a possibility of getting on or interfering with 21c, control for restricting the operation of reducing the main work table 20 is performed. Accordingly, it is possible to prevent the sub workbench unit 60 (160) from getting on or interfering with the intermediate deck 21b and the front deck 21c due to the reduction operation of the main workbench 20.

  Note that the flow of FIG. 13 is repeated at predetermined time intervals, for example, every 10 ms.

1 Bridge inspection vehicle (aerial work vehicle)
2 Car body 5 Boom (main lifting device)
10 post (main lifting device)
20 Main work table 60 Sub work table unit 61 Sub work table 64 Front guard part (side surface parallel to longitudinal direction)
66L Left open / close door (open / close member)
66R Right open / close door (open / close member)
71 Lifting device (Sub lifting device)
76 Slide support device (sub support device)

Claims (7)

A traveling body configured to travel with a vehicle body;
A main lifting device provided on the vehicle body;
A main work platform for boarding an operator supported by the main lifting device and moved up and down by the main lifting device;
A sub workbench unit having a sub workbench capable of moving up and down for boarding an operator,
The main workbench is formed in a long shape,
The aerial work platform characterized in that the sub workbench unit can be arranged at an arbitrary position in the longitudinal direction on the main workbench.   The sub workbench unit can move in the longitudinal direction on the main workbench, and can move in the longitudinal direction on the main workbench and be arranged at any position in the longitudinal direction on the main workbench. The aerial work vehicle according to claim 1. The sub workbench unit is
A sub-support device that can be arranged at any position in the longitudinal direction on the main workbench;
The aerial work vehicle according to claim 1 or 2, further comprising a sub-lifting device that is provided in the sub-supporting device and moves the sub-workbench up and down relative to the sub-supporting device. .   The sub workbench is formed in a rectangular box shape having an open top, and open portions opened in the longitudinal direction are formed on both side surfaces opposed to the longitudinal direction, and the opening and closing can be opened and closed. The aerial work vehicle according to any one of claims 1 to 3, further comprising a member.   The aerial work vehicle according to claim 4, wherein the sub lifting device is provided on any side surface of the sub work table parallel to the longitudinal direction. The sub workbench unit includes a sub support device that can be arranged at an arbitrary position in the longitudinal direction on the main work table, and the sub work table that is rotatably attached to the upper part of the sub support device. ,
By rotating the sub workbench up and down with respect to the sub support device, the sub workbench is placed on the sub support device and moved upward and located above the sub support device. The aerial work vehicle according to claim 1 or 2, characterized in that the vehicle can be moved up and down to a position. The main elevating device includes a boom provided on the vehicle body capable of undulating motion, turning motion and telescopic motion, and a post capable of telescopic motion provided on the tip of the boom so as to swing up and down. ,
The post is maintained in a posture extending substantially vertically when working at a high place and can be expanded and contracted downward,
The aerial work vehicle according to any one of claims 1 to 6, wherein the main work table is attached to a lower end of the post in a posture extending substantially vertically.

Images