JP5725407B2 - Lifting scaffolding device - Google Patents

Description

  The present invention relates to a lifting and lowering scaffold device that can be used for a temporary scaffolding laid in, for example, a building such as a building, and in particular, a work floor can be moved up and down.

  Conventionally, a temporary scaffold is provided along a building in a construction work such as a building, and has a work floor for an operator to perform work. In recent years, an elevating type scaffolding device in which a work floor can be moved up and down in the vertical direction has been proposed.

Japanese Patent No. 2881677

  Among the above-mentioned lifting-type scaffolding devices, for example, there are two towers, and a scaffolding part having a work floor is connected between these towers, and this scaffolding part moves up and down while maintaining a horizontal state. ing. That is, in this lifting type scaffolding device, for example, two towers are juxtaposed at a predetermined interval on the ground on which the building is erected, and lifting units that can be moved up and down along each tower are respectively provided. Is provided.

  According to this lifting / lowering scaffold device, both the lifting and lowering portions are lifted and lowered simultaneously, so that the scaffolding portion is lifted and lowered while maintaining almost horizontal. For example, when the scaffold part rises to a predetermined height position and is stopped, the worker who is on the scaffold part can perform a work at a high position at the predetermined height position.

  In the lifting / lowering scaffold device, an openable / closable door is provided for an operator to get on and off at a predetermined position of the scaffold portion. For example, the scaffolding part is provided with a handrail for preventing the worker from falling from the scaffolding part, but the door is constituted by a part of the handrail and is fan-shaped with one end as a fulcrum in plan view. It can be opened and closed by moving.

  However, in this lifting type scaffolding device, if the scaffolding part moves up and down while the door is open, there is a possibility that the operator may fall down and fall from the opened door. In the lifting and lowering type scaffolding device, since the worker is on the scaffolding portion that moves up and down, it is required to fully consider the safety of the worker.

  The present invention has been conceived under the circumstances described above, and is a lifting type scaffolding device that can ensure the safety of an operator riding on the scaffolding part when the scaffolding part moves up and down. The issue is to provide

The lifting and lowering scaffold device provided by the present invention is connected to a tower portion extending in the vertical direction, a lifting portion provided so as to be movable up and down along the tower portion, and extending substantially in a lateral direction of the lifting portion. And a scaffold part that moves up and down by raising and lowering the elevator part, an extension part that is provided at an end part of the scaffold part and is movable forward and backward in the extension direction of the scaffold part, and the extension part before raising and lowering the scaffold part is characterized but the state detecting means for detecting a state of forward and backward movement, that and a prohibition control means for controlling to prohibit the lifting of the lifting portion on the basis of the detection result by the state detecting means .

The lifting and lowering scaffold device according to the present invention includes a tower portion extending in the vertical direction, a lifting portion provided so as to be movable up and down along the tower portion, and extending and connected in a substantially lateral direction of the lifting portion, and A scaffold part that moves up and down by raising and lowering the elevator part, a moving means that moves the scaffold part in a direction orthogonal to the extending direction of the scaffold part, and the scaffold part is moved by the moving means before the scaffold part is raised and lowered It is preferable to include state detection means for detecting a state in which the vehicle is in operation, and prohibition control means for performing control so as to prohibit the lifting and lowering of the lift based on the detection result of the state detection means .

The lifting and lowering scaffold device according to the present invention includes a tower portion extending in the vertical direction, a lifting portion provided so as to be movable up and down along the tower portion, and extending and connected in a substantially lateral direction of the lifting portion, and A scaffold part that is raised and lowered by raising and lowering of the raising and lowering part, a connecting means that is provided between the raising and lowering part and the scaffold part, and that can be connected together, and the connection by the connecting means is released before raising and lowering the scaffold part. It is preferable to include state detection means for detecting a state in which the vehicle is moving and prohibition control means for controlling the movement of the elevating unit to be prohibited based on the detection result of the state detection means .

  According to the present invention, before the scaffold part is moved up and down, for example, when the door is in an open state, when the extension part of the scaffold part moves forward and backward, the scaffold part moves in a direction orthogonal to the extension direction. If the connection between the lifting part and the scaffold part is released, or if the power cable is in an over-extended state, the lifting part is prohibited from moving up and down. Therefore, it is possible to reliably ensure the safety of the worker who is on the scaffold.

It is a front view which shows the raising / lowering scaffold apparatus of this invention. The arrangement | positioning relationship of a 1st motor and a pinion is shown, (a) is a side view, (b) is a rear view. The storage state of the 1st advance / retreat part with respect to a 1st side part is shown, (a) is the state which the 1st advance / retreat part was accommodated in the 1st side part, and was retracted, (b) is the 1st advance / retreat part. It is the state advanced to the exterior of the 1st side part. The state where the scaffold part approaches the building is shown, (a) is when the horizontal movement part is at the reference position, and (b) is when the horizontal movement part is at the displacement position. It is a figure which shows the open state of the door of a scaffold part. The connection state of a 1st horizontal movement part and a 1st side part is shown, (a) is the state which the 1st side part extended with respect to the 1st horizontal movement part, (b) is a 1st side part turning. It is the state that was done. It is a front view which shows a control panel and an operation box. It is a block diagram which shows the electric constitution of a raising / lowering type scaffold apparatus. It is a flowchart which shows the state detection control by a control part.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a front view showing an elevating scaffold device (hereinafter simply referred to as “scaffold device”) according to the present invention. This scaffold device is used for, for example, a temporary scaffold for construction work, and is particularly a lifting type in which a work floor is raised and lowered.

  As shown in FIG. 1, the scaffold device includes two towers. The scaffold device includes a first tower 1 having a predetermined height, a second tower 2 arranged in parallel at a predetermined interval, and a scaffold unit 3 that can be moved up and down supported by both towers 1 and 2. I have. The first tower 1 and the second tower 2 have substantially the same configuration. In the following description, members having the same configuration are denoted by the same reference numerals.

  Each tower 1, 2 has a base portion 4 for supporting it. The base portion 4 is formed in a substantially flat plate shape, and a plurality of jack mechanisms 5 are provided at corner portions of the base portion 4. The jack mechanism 5 maintains the base part 4 in a horizontal state by adjusting the respective heights. The jack mechanism 5 is provided with a jack looseness detection sensor 42 (described later) for detecting that the jack bolt is loosened.

  The base part 4 is provided with an outrigger mechanism 6. The outrigger mechanism 6 is composed of a plurality of members extending radially from the base portion 4, and supports the towers 1 and 2 with respect to the ground G. A jack mechanism 6 a is provided at each end of the outrigger mechanism 6. The jack mechanism 6a is provided with a not-shown outrigger jack relaxation detection sensor 43 (described later) for detecting that the jack bolt is loosened.

  The base unit 4 is provided with a moving wheel (not shown). The wheel for movement is for moving each tower 1 and 2 to the predetermined position of a construction site. The moving wheel is accompanied by a brake mechanism, and the brake mechanism is provided with a brake braking detection sensor 44 (described later) for detecting that braking by this is not performed.

  The first and second towers 1 and 2 are configured such that a plurality of frame members 7 whose outer shapes are formed in a substantially rectangular parallelepiped frame shape are connected. Specifically, the first and second towers 1 and 2 are configured such that the lowermost frame member 7 is attached at the center of the base portion 4 and the other frame member 7 is stacked above the frame member 7. Is done.

  A first rack 8 extending in the vertical direction is provided in the internal space of each frame member 7 of the first tower 1. The 1st rack 8 is formed in elongate shape, and as shown in FIG.2 (b), the meshing part 8a with which the several pinion 10 is meshed | engaged is formed in the one side end surface. Similarly, a second rack 9 extending in the vertical direction is provided in the internal space of each frame member 7 of the second tower 2. The second rack 9 has the same configuration as the first rack 8.

  The 1st tower 1 is provided with the 1st raising / lowering part 11 which can be raised / lowered up and down along it. The 1st raising / lowering part 11 is formed in the substantially rectangular parallelepiped frame shape extended in the height direction. The 1st raising / lowering part 11 is raised / lowered along the outer surface of the frame member 7 via a guide roller not shown. Further, the second tower 2 is provided with a second elevating unit 12 that can be moved up and down along the second tower 2. The second elevating unit 12 has the same configuration as the first elevating unit 11.

  As shown in FIGS. 1 and 2, a first motor 13 for raising and lowering the first elevating part 11 is attached to the first elevating part 11. The first motor 13 is an induction motor and is provided with a brake mechanism that stops its rotation. The first motor 13 is actually composed of two motors arranged side by side, and is considered in consideration of emergency safety such as using one motor when one motor fails. Yes. Therefore, in the following description, the two motors are collectively referred to as the first motor 13.

  On the other hand, a second motor 14 is attached to the second elevating unit 12 for elevating it. The second motor 14 has the same configuration as the first motor 13.

  The first elevating part 11 is provided with a first horizontal moving part 15 that covers the upper and lower part 11 and can move horizontally in the front-rear direction (before or in the depth direction in FIG. 1). The second elevating unit 12 is provided with a second horizontal moving unit 16 that covers the upper lifting unit 12 and can move horizontally in the front-rear direction. The 1st and 2nd horizontal movement parts 15 and 16 are for moving the scaffold part 3 to the front-back direction. The first and second horizontal moving portions 15 and 16 are each formed in a substantially rectangular parallelepiped frame shape extending in the front-rear direction.

  The scaffold portion 3 is provided so as to extend in a substantially horizontal direction between the first and second horizontal moving portions 15 and 16 and on the side of the first and second horizontal moving portions 15 and 16. The scaffold part 3 has a main body part 3a formed in a substantially rectangular parallelepiped frame shape, a work floor (not shown) arranged on the upper surface of the main body part 3a, and a handrail 3b for preventing the operator from falling. doing.

  More specifically, the scaffold portion 3 includes an intermediate portion 18 provided between the first and second horizontal moving portions 15 and 16 and a first side portion 19 extending in the left direction of the first horizontal moving portion 15. And a second lateral portion 20 extending in the right direction of the second horizontal movement portion 16. The first side portion 19 is provided with a first advance / retreat portion 21 that can advance and retreat in the left direction. Further, the second side part 20 is provided with a second advance / retreat part 22 that is movable forward and backward in the right direction (FIG. 1 shows a state in which the first advance / retreat part 21 and the second advance / retreat part 22 have advanced respectively) Is shown.)

  That is, as shown in FIG. 3, the first advancing / retracting portion 21 is accommodated in the first side portion 19 and retracted (see FIG. 3A), and outside the first side portion 19. It can be moved forward and backward to the advanced state (see FIG. 3B). Similarly to the first advance / retreat part 21, the second advance / retreat part 22 is configured to advance and retreat with respect to the second side part 20. The first and second side portions 19 and 20 are respectively provided with unillustrated forward / backward movement detection sensors 38 (described later) for detecting that the first and second forward / backward portions 21 and 22 are moving forward and backward. It has been.

  Around the first horizontal moving part 15, a first auxiliary part 23 that connects the intermediate part 18 and the first side part 19 is provided, and around the second horizontal moving part 16, the intermediate part 18 and the second side part 19 are provided. A second auxiliary portion 24 that connects the side portion 20 is provided. By providing the first auxiliary part 23 and the second auxiliary part 24, the work floor of the scaffold part 3 extends from the first advance / retreat part 21 arranged at the right end to the second advance / retreat part 22 arranged at the left end. The floor is almost flush. Therefore, the worker who has boarded the scaffold unit 3 can move from the first advance / retreat unit 21 to the second advance / retreat unit 22 without once getting off the scaffold unit 3.

  Here, the 1st and 2nd horizontal displacement parts 15 and 16 approach the reference | standard position (position in which the base part 4 was installed) shown to Fig.4 (a), and the building B side shown to FIG.4 (b). It is possible to move between the displaced positions by a moving mechanism (not shown). Thereby, the scaffold part 3 is comprised so that the operator who boarded the scaffold part 3 may work more easily, approaching the building B with the movement of the 1st and 2nd horizontal movement parts 15 and 16. Yes. In addition, although FIG. 4 has shown the movement state of the 1st horizontal movement part 15, the 2nd horizontal movement part 16 approaches and moves to the building B side similarly.

  In the scaffold device of the present embodiment, the first and second elevating parts 11 and 12 are not shown in the drawings for detecting that the first and second horizontal moving parts 15 and 16 are moving horizontally by the moving mechanism. The horizontal movement detection sensor 37 (described later) is provided.

  As shown in FIG. 5, a door 25 that is openable and closable so that an operator can get on the scaffold unit 3 is provided at the end of the first advancement / retraction unit 21. The door 25 is formed as a part of the handrail 3b. On the other hand, although not shown, a door 25 having the same shape is provided at the end of the second advance / retreat portion 22. In the scaffold device of this embodiment, a door open state detection sensor 36 (described later) for detecting the open state of these doors 25 is provided.

  As shown in FIG. 6, the first side portion 19 is rotatable with respect to the first horizontal moving portion 15 by a turning mechanism (not shown). That is, the first side portion 19 extends leftward with respect to the first horizontal movement portion 15 (see FIG. 6A) and is turned at a predetermined angle (see FIG. 6B). It can be displaced freely.

  In the state of FIG. 6A, the first side portion 19 is connected to the first horizontal moving portion 15 by the first connecting mechanism 27 and the second connecting mechanism 28. The first connecting mechanism 27 is configured such that projecting portions 15a and 19a projecting from the first horizontal moving portion 15 and the first side portion 19 are locked to each other by a connection pin (not shown). . Similarly, in the second connecting mechanism 28, the protruding portions 15b and 19b protruding from the first horizontal moving portion 15 and the first side portion 19 are locked to each other by a connecting pin (not shown). It is configured.

  As shown in FIG. 6B, for example, if the connecting pin of the first connecting mechanism 27 is removed and the first side portion 19 is moved so as to be bent toward the front side, the entire first side portion 19 is moved toward the front side. It is turned. On the other hand, if the connecting pin of the second connecting mechanism 28 is removed and the first side portion 19 is moved so as to be bent to the depth side, the entire first side portion 19 is turned to the swoop side.

  Although not shown, the second side portion 20 is also turnable with respect to the second horizontal movement portion 16. In the scaffold device of this embodiment, it is detected that one of the connecting pins is removed from the first connecting mechanism 27 and the second connecting mechanism 28, that is, by the first connecting mechanism 27 or the second connecting mechanism 28. An unillustrated pin removal / detection sensor 39 (described later) for detecting a state in which the connection is released is provided.

  Returning to FIG. 1, the first and second towers 1 and 2 are each provided with a supporting mechanism 29 for supporting and supporting the intermediate part 18, the first side part 19, and the second side part 20 of the scaffold part 3. It has been. The first and second side portions 19 and 20 are respectively supported by the respective supporting mechanisms 29 when they are turned. In the scaffold device of the present embodiment, each holding mechanism 29 is provided with a not-shown holding mechanism turning detection sensor 40 (described later) for detecting that these are turning.

  A control panel 30 is provided on each of the handrails 3b of the first and second side portions 19 and 20. The control panel 30 includes a control unit 35 (described later). As shown in FIG. 7, a monitor unit 31 and an emergency stop button 32 are provided on the front surface of the control panel 30. The monitor unit 31 is configured by a liquid crystal display having a touch panel. The emergency stop button 32 is pressed to forcibly stop the lifting / lowering of the scaffold part 3 in an emergency.

  An operation box 34 is connected to one of the two control panels 30. The operation box 34 is used by the operator to input the lifting / lowering operation of the scaffold unit 3. The operation box 34 includes an up switch 34a and a down switch 34b as shown in the circle of FIG. The raising switch 34a is for raising the scaffold part 3, and the lowering switch 34b is for lowering the scaffold part 3. The up switch 34a and the down switch 34b are momentary switches that transmit an operation signal to the control unit 35 only when the switch is pressed.

  Although not shown in FIG. 1, the control panel 30 and the first and second motors 13 and 14 are connected with a power cable for supplying a power supply voltage for driving them. Since the 1st and 2nd raising / lowering parts 11 and 12 and the scaffold part 3 move up and down in the up-down direction, the power cable is laid by what is called a basket system. That is, a part of the power cable is housed in a basket (not shown) provided on the ground G in a state of being wound with a scissors, and the other part is accommodated from the basket through the air. The first and second elevating units 11, 12 are connected to the first and second motors 13, 14 or to the control panel 30 of the scaffold unit 3.

  Although not shown in the figure, the power cable is constituted by, for example, a load cell and the like, and a cable over-extension detection sensor 41 for detecting a state in which the power cable is over-extended (detects a case where the tension of the power cable becomes large). (Described later) is provided.

  FIG. 8 is a block diagram showing an electrical configuration of the scaffold device. In this scaffold device, the control panel 30 is provided with a control unit 35 composed of, for example, a sequencer. A monitor unit 31 and an emergency stop button 32 are connected to the control unit 35. The control unit 35 sends display data to be displayed to the monitor unit 31 and performs various data processing based on operation signals from the monitor unit 31 using the touch panel. When the pressing signal from the emergency stop button 32 is input, the control unit 35 controls to forcibly stop the rotational driving of the first and second motors 13 and 14.

  A first motor 13 and a second motor 14 are connected to the control unit 35. The control unit 35 sends drive signals to the first and second motors 13 and 14, respectively. As a result, the first and second motors 13 and 14 are turned on and off independently according to the drive signal.

  An operation box 34 is connected to the control unit 35, and operation signals from the up switch 34 a and the down switch 34 b are input from the operation box 34. Based on these operation signals, the control unit 35 turns on and off the first and second motors 13 and 14, thereby moving the scaffold unit 3 up and down.

  The control unit 35 includes a door open / close detection sensor 36, a horizontal movement detection sensor 37, a forward / backward movement detection sensor 38, a pin removal / detection sensor 39, a carrying mechanism turning detection sensor 40, a cable overextension detection sensor 41, and a jack relaxation detection sensor 42. The outrigger jack relaxation detection sensor 43 and the brake braking detection sensor 44 are connected.

  When the signal indicating that the door 25 is in the open state is transmitted from the door opening / closing detection sensor 36, the control unit 35 receives a signal indicating that the scaffold unit 3 is moving in the horizontal direction from the horizontal movement detection sensor 37. When transmitted, a signal indicating that the first and second advancing / retreating portions 21 and 22 are moving forward / backward is transmitted from the advance / retreat movement detection sensor 38, and the first and second sides from the pin removal detection sensor 39 are transmitted. When a signal indicating that the connecting pins for connecting the side portions 19 and 20 to the first and second horizontal moving portions 15 and 16 are removed is transmitted from the supporting mechanism turning detection sensor 40 to each supporting mechanism. When the signal indicating that 29 is turning is transmitted, when the signal indicating the state where the power cable is excessively extended is transmitted from the cable overextension detection sensor 41, the jack looseness detection sensor 42 is connected to the base portion. When a signal indicating that the jack bolt of the jack mechanism 5 is relaxed is transmitted, a signal indicating that the jack bolt of the outrigger mechanism 6 is relaxed is transmitted from the jack relaxation detection sensor 43 for the outrigger. Alternatively, when a signal indicating that braking by the brake mechanism of the moving wheel of the base portion 4 is not performed is transmitted from the brake braking detection sensor 44, the first and second motors 13 and 14 are driven to rotate. Stop and prohibit the raising and lowering of the scaffold part 3.

  Next, the state detection control in the control part 35 is demonstrated in detail with reference to the flowchart shown in FIG. In the present embodiment, after an operation for raising and lowering is performed by an operator, the raising and lowering of the scaffold part 3 is prohibited when any one of the outputs of the various sensors described above is abnormal, and safety during raising and lowering is performed. We are trying to ensure sex.

  Specifically, the control unit 35 determines whether the operator performs an ascending operation (pressing the ascending switch 34a) or a descending operation (pressing the descending switch 34b) via the operation box 34 (S1). Specifically, the control unit 35 determines whether an ascending operation signal is received from the ascending switch 34a or a descending operation signal is received from the descending switch 34b.

  When receiving the ascending operation signal or the descending operation signal (S1: YES), the controller 35 determines whether or not the door 25 is in an open state (S2). Specifically, the control unit 35 performs the determination in step S <b> 2 based on whether or not a detection signal indicating that the door 25 is in the open state is transmitted from the door opening / closing detection sensor 36. Here, as shown in FIG. 5, when the door 25 is in the open state, the door open / close detection sensor 36 detects the state and transmits the detection signal to the control unit 35.

  When the detection signal is transmitted, the control unit 35 determines that the door 25 is in an open state (S2: YES), and controls the first and second motors 13 and 14 not to be driven (S3). That is, when the operator has input an operation signal for raising and lowering the scaffold part 3 via the operation box 34, the door 25 of the scaffold part 3 is in an open state. Lifting / lowering operation is prohibited. Thereby, the safety | security of the operator who is boarding the scaffold part 3 is securable.

  When the door 25 is in the closed state in step S2 (S2: NO), the control unit 35 determines whether or not the first and second elevating units 11 and 12 are moving in the front-rear direction (S4). Specifically, the control unit 35 performs the determination in step S4 depending on whether or not a detection signal indicating that the scaffold unit 3 is moving in the horizontal direction is transmitted from the horizontal movement detection sensor 37.

  Here, as shown in FIG. 4, when the first and second elevating units 11 and 12 are moving in the front-rear direction, the horizontal movement detection sensor 37 detects the state and sends the detection signal to the control unit 35. To communicate. Based on the detection signal, the control unit 35 determines that the first and second elevating units 11 and 12 are moving in the front-rear direction (S4: YES), and does not drive the first and second motors 13 and 14. Control is performed (S3).

  When the first and second elevating parts 11 and 12 are not moving in the front-rear direction in step S4 (S4: NO), the control unit 35 is moving the first and second advancing / retreating parts 21 and 22 in the left-right direction. It is determined whether or not there is (S5). Specifically, the control unit 35 determines whether or not the step S5 is detected based on whether or not a detection signal indicating that the first and second advancing / retreating units 21 and 22 are moving in the horizontal direction is transmitted from the advancing / retreating movement detection sensor 38. I do.

  Here, as shown in FIG. 3B, when the first and second advancing / retreating units 21 and 22 are moving forward / backward in the left / right direction, the advancing / retreating movement detection sensor 38 detects the state, and the detection signal Is transmitted to the control unit 35. Based on the detection signal, the control unit 35 determines that the first and second advance / retreat units 21 and 22 are moving forward and backward in the left-right direction (S5: YES), and drives the first and second motors 13 and 14. Control is made so as not to cause it (S3).

  When the first and second advancing / retracting units 21 and 22 are not moving back and forth in the left / right direction in step S5 (S5: NO), the control unit 35 removes the connecting pin of the first connecting mechanism 27 or the second connecting mechanism 28. It is determined whether or not (S6). Specifically, the control unit 35 performs the determination in step S6 depending on whether or not a detection signal indicating that the connecting pin is removed is transmitted from the pin removal detection sensor 39.

  Here, as shown in FIG. 6B, when the connecting pin is removed, the pin removal detection sensor 39 detects the state and transmits the detection signal to the control unit 35. Based on the detection signal, the control unit 35 determines that the connecting pin is removed (S6: YES), and controls the first and second motors 13 and 14 not to be driven (S3).

  When the connecting pin is not removed in step S6 (S6: NO), the control unit 35 determines whether or not the carrying mechanism 29 is turning (S7). Specifically, the control unit 35 performs the determination in step S7 based on whether or not a detection signal indicating that the holding mechanism 29 is turning is transmitted from the holding mechanism turning detection sensor 40.

  When the holding mechanism 29 is turning, the holding mechanism turning detection sensor 40 detects the state and transmits the detection signal to the control unit 35. Based on the detection signal, the control unit 35 determines that the carrying mechanism 29 is turning (S7: YES), and controls the first and second motors 13 and 14 not to be driven (S3).

  When the carrying mechanism 29 is not turning in step S7 (S7: NO), the control unit 35 determines whether or not the power cable is in an over-extended state (S8). Specifically, the control unit 35 performs the determination in step S8 depending on whether or not a detection signal indicating that the power cable is in an overextended state is transmitted from the cable overextension detection sensor 41.

  When the power cable is in an overextended state, the cable overextension detection sensor 41 detects the state and transmits the detection signal to the control unit 35. Based on the detection signal, the control unit 35 determines that the power cable is in an excessively extended state (S8: YES), and controls the first and second motors 13 and 14 not to be driven (S3).

  If the power cable is not in an excessively extended state in step S8 (S8: NO), the control unit 35 determines whether or not the jack bolt of the jack mechanism 5 is loosened (S9). Specifically, the control unit 35 performs the determination in step S9 based on whether or not a detection signal indicating that the jack bolt is loose is transmitted from the jack loosening detection sensor 42.

  When the jack bolt of the jack mechanism 5 is relaxed, the jack relaxation detection sensor 42 detects the state and transmits the detection signal to the control unit 35. Based on the detection signal, the control unit 35 determines that the jack bolt is loosened (S9: YES), and controls the first and second motors 13 and 14 not to be driven (S3).

  When the jack bolt is loosened in step S9 (S9: NO), the control unit 35 determines whether or not the jack bolt of the outrigger mechanism 6 is loosened (S10). Specifically, the control unit 35 performs the determination in step S10 depending on whether or not a detection signal indicating that the jack bolt of the outrigger mechanism 6 is loose is transmitted from the outrigger jack relaxation detection sensor 43.

  When the jack bolt of the outrigger mechanism 6 is relaxed, the outrigger jack relaxation detection sensor 43 detects the state and transmits the detection signal to the control unit 35. Based on the detection signal, the control unit 35 determines that the jack bolt of the outrigger mechanism 6 is loosened (S10: YES), and controls the first and second motors 13 and 14 not to be driven (S3).

  When the jack bolt of the outrigger mechanism 6 is not loosened in step S10 (S10: NO), the control unit 35 determines whether or not braking by the brake mechanism of the moving wheel of the base unit 4 is not performed ( S11). Specifically, the control unit 35 performs the determination in step S11 depending on whether or not a detection signal indicating that braking by the brake mechanism of the moving wheel of the base unit 4 is being performed is transmitted from the brake braking detection sensor 44. .

  When braking by the brake mechanism of the moving wheel of the base unit 4 is not performed, the brake braking detection sensor 44 detects the state and transmits the detection signal to the control unit 35. Based on the detection signal, the control unit 35 determines that braking by the brake mechanism of the moving wheel of the base unit 4 is not performed (S11: YES), and does not drive the first and second motors 13 and 14. Control (S3).

  When braking by the brake mechanism of the moving wheel of the base unit 4 is performed in step S11 (S11: NO), the control unit 35 rotates in the forward direction (ascending with respect to the first and second motors 13 and 14, respectively). ) Or a drive signal for driving in the reverse direction (downward). Thereby, the 1st and 2nd motors 13 and 14 are each rotationally driven in the normal rotation direction or the reverse rotation direction (S12).

  In the first tower 1, when the first motor 13 is driven to rotate, the first pinion 15 pivoted on the first motor 13 rotates. And the 1st raising / lowering part 11 raises / lowers along the 1st tower 1 by the 1st pinion 15 and the 1st rack 8 cooperating. Similarly, in the second tower 2, when the second motor 14 is driven to rotate, the pinion pivoted on the second motor 14 rotates. And the 2nd raising / lowering part 12 raises / lowers along the 2nd tower 2 by a pinion and the 2nd rack 9 cooperating. Thus, if the 1st and 2nd raising / lowering parts 11 and 12 raise / lower, the scaffold part 3 will raise / lower with it.

  As described above, in the present embodiment, when the door 25 is in the open state even though the operation signal for raising and lowering the scaffold part 3 is input by the operator, the first and second raising and lowering parts 11 and 11, 12 is moving in the front-rear direction, the first and second advancing and retracting parts 21 and 22 are moving back and forth in the left-right direction, the connecting pin is removed, and the carrying mechanism 29 is turning. When the power cable is in an excessively extended state, when the jack bolt of the jack mechanism 5 is loosened, when the jack bolt of the outrigger mechanism 6 is loosened, or when braking by the brake mechanism is not performed The lifting / lowering operation of the scaffold part 3 is prohibited. Therefore, it is possible to sufficiently ensure the safety of the worker who is on the scaffold part 3.

  When the first and second motors 13 and 14 are driven in step S12, the process returns to step S1. That is, it is determined whether or not the worker has stopped pressing the ascending switch 34a or the descending switch 34b, and when it is determined that the ascending switch 34a or the descending switch 34b continues to be depressed (S1: NO), the first and first (2) The rotational driving of the motors 13 and 14 is stopped (S3). Thereby, the raising / lowering of the scaffold part 3 is stopped.

The scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, in the embodiment described above, when each of the detection sensors outputs a detection signal, the operator may be notified of the fact. As a notification method, display or sound may be performed using Patlite (registered trademark) or the like. Or you may make it display on the display part 31 of the operation panel 30 that each detection sensor output the detection signal.

  Moreover, in the said embodiment, when each detection sensor output the detection signal before raising / lowering the scaffold part 3, raising / lowering of the scaffold part 3 was prohibited, However, While the scaffold part 3 is raising / lowering, In addition, when any of the detection sensors outputs a detection signal, the raising / lowering of the scaffold part 3 may be stopped. For example, when it is detected that the door 25 is opened by the door open state detection sensor 36 while the scaffold part 3 is moving up and down, or the power cable is in an excessive extension state by the cable over extension detection sensor 41. When this is detected, the lifting / lowering operation of the scaffold unit 3 may be stopped.

  For example, although the case where a plurality of detection sensors are provided has been described in the above embodiment, the number, form, configuration, and the like of the detection sensors are not limited to the above embodiment. The first and second towers 1 and 2, the scaffold unit 3, the first and second elevating units 11 and 12, the first and second motors 13 and 14, the control panel 30, the door open state detection sensor 36, and the like. The design of the sensor can be changed as appropriate. Moreover, in the scaffold apparatus of this embodiment, although it had the 1st and 2nd towers 1 and 2, it is not restricted to this structure, For example, you may be comprised with one tower. Moreover, the control board 30 may be comprised by one.

DESCRIPTION OF SYMBOLS 1 1st tower 2 2nd tower 3 Scaffold part 5 Jack mechanism 6 Outrigger mechanism 11 1st raising / lowering part 12 2nd raising / lowering part 13 1st motor 14 2nd motor 15 1st horizontal moving part 16 2nd horizontal moving part 21 1st Advancement / retraction unit 22 Second advancement / retraction unit 25 Door 29 Carrying mechanism 35 Control unit 36 Door open state detection sensor 37 Horizontal movement detection sensor 38 Advance movement detection sensor 39 Pin removal detection sensor 40 Carrying mechanism turning detection sensor 41 Cable overextension detection sensor 42 Jack relaxation detection sensor 43 Outrigger jack relaxation detection sensor 44 Brake braking detection sensor

Claims (3)

A tower portion extending vertically, and
An elevating part provided so as to be movable up and down along the tower part;
A scaffold part extending and connected substantially in the lateral direction of the elevating part and elevating by raising and lowering the elevating part;
An extension part provided at an end of the scaffold part and capable of moving forward and backward in the extension direction of the scaffold part;
A state detecting means for detecting a state in which the extending part is moving forward and backward before the scaffold part is raised and lowered;
A prohibition control means for controlling to prohibit the raising and lowering of the elevating unit based on a detection result by the state detecting means;
A lifting and lowering scaffold device comprising: A tower portion extending vertically, and
An elevating part provided so as to be movable up and down along the tower part;
A scaffold part extending and connected substantially in the lateral direction of the elevating part and elevating by raising and lowering the elevating part;
Moving means for moving the scaffold part in an orthogonal direction perpendicular to the extending direction of the scaffold part;
State detecting means for detecting a state in which the scaffold part is moved by the moving means before the scaffold part is raised and lowered;
A prohibition control means for controlling to prohibit the raising and lowering of the elevating unit based on a detection result by the state detecting means;
A lifting and lowering scaffold device comprising: A tower portion extending vertically, and
An elevating part provided so as to be movable up and down along the tower part;
A scaffold part extending and connected substantially in the lateral direction of the elevating part and elevating by raising and lowering the elevating part;
A connecting means provided between the elevating part and the scaffold part, which can connect both;
A state detecting means for detecting a state in which the connection by the connecting means is released before the scaffold part is raised and lowered;
A prohibition control means for controlling to prohibit the raising and lowering of the elevating unit based on a detection result by the state detecting means;
A lifting and lowering scaffold device comprising:

Images