JPH0224966B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a mobile scaffolding device for painting, maintaining and inspecting the main steel cables of a long suspension bridge.

(Prior Art) In recent years, long suspension bridges that cross straits have been constructed. In such long suspension bridges, the main steel cables that suspend the bridge deck via suspension steel cables are the most important component. Therefore, painting and maintenance inspection work on the main steel cable is extremely important and frequently performed.
This work is required to be performed smoothly and easily.

For the above-mentioned work, mobile scaffolding devices that are movable along main steel cables have been proposed. This device, for example,
It is configured as shown in Publication No.-58484.
That is, the trolley is supported by the handrail steel cable so that it can move on the handrail steel cable provided along the main steel cable,
A workbench is supported on this trolley. The truck is equipped with a winch, and a traction rope is provided with one end connected to the handrail steel cable and the other end wrapped around the winch. Then, by winding and unwinding the rope by driving the winch, the trolley travels on the handrail steel cable, and the workbench is thereby transported to a desired position.

(Problem to be Solved by the Invention) By the way, since the support grip part for supporting the handrail steel cable on the main steel cable is a part of the handrail steel cable where the diameter dimension is large, it is difficult for the trolley to move on the handrail steel cable. When a vehicle tries to ride over this strut grip while traveling, the running resistance will suddenly increase. Therefore, when the cart reaches the strut grip, the movement of the cart is restricted by the strut grip even while the winch is wrapping the tow rope around it, causing the tow rope to stretch due to elastic deformation. The tension will increase. From this state, when the truck passes over the strut grip, the truck moves rapidly for a moment due to the above tension, and immediately after this, the tension of the towing rope drops all at once, causing the truck to decelerate. In this way, when the trolley passes through the strut grip, the tension of the tow rope changes significantly, causing the trolley and the work platform supported by it to sway in the longitudinal direction of the steel cable, causing discomfort to the occupants on the work platform. There is the inconvenience of giving

In addition, in the case of the above configuration, it is necessary to always install the tow rope along the handrail steel cable so that the trolley is movable at any time, or to install the tow rope along the handrail steel cable every time the main steel cable is painted. It is required to make the trolley movable by wrapping it around a steel cable or winch, but in the former case, the towing rope itself needs to be painted and maintained, which is complicated, and in the latter case, Work is required to wrap the tow rope, but this is complicated.

(Object of the Invention) This invention was made in view of the above-mentioned circumstances, and it is an object of the present invention to enable a trolley and a work platform supported by the trolley to move smoothly on a handrail steel cable without being shaken. The purpose is also to make it easier to perform work such as painting the main steel cables.

(Structure of the Invention) A feature of the present invention for achieving the above object is that a pair of friction rotors are provided to sandwich the handrail steel cable, and the friction rotors are supported by a cart. The present invention is characterized in that a pressing means is provided which is interlocked and connected to the driving means provided on the truck and which elastically presses both of the friction rotating bodies against the handrail steel cable.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In Figures 1 to 4, 1 is a long suspension bridge,
This long suspension bridge 1 has a support tower 2 and a main steel cable 3 supported by the support tower 2, and this main steel cable 3 has a suspension steel cable 4.
This hanging steel cable 4 is connected to the main steel cable 3 by a fastener 5. A bridge deck 6 is supported at the lower end of the hanging steel cables 4. Further, a pair of parallel steel cables 8, 8 for handrails are provided near the upper part of the main steel cable 3 along the main steel cable 3.

In order to paint the main steel cable 3 and perform maintenance and inspection work, a mobile scaffolding device A is provided which can carry a worker and move freely along the main steel cable 3. This device A will be explained below.

A cart 9 is provided which runs over the handrail steel cables 8, 8, and a pair of left and right work platforms 11, 11 are supported on this cart 9 via a support stand 10.
The workbenches 11, 11 move together with the cart 9.
Further, the above-mentioned truck 9 is provided with a drive device 12 that drives the truck 9 to run and make it self-propelled.

The trolley 9 has a main frame 14 located on the handrail steel cables 8,8. Arrows in Figures 2 and 4
If the direction of Fr is the front, the main frame 14
A front frame 15 is provided to protrude forward from the front part of the main frame 14, and a rear frame 16 is provided to protrude rearward from the rear part of the main frame 14.

A pair of front wheels 17 and 1 are provided on each side of the front frame 15 and roll on each handrail steel cable 8.
7 are respectively supported, and a pair of rear wheels 18, 18 that roll on each handrail steel cable 8 are supported on each side of the rear frame 16, respectively. 1
9 is an emergency stop clamp.

The support stand 10 has a base 22 which is pivotally supported on the main frame 14 by a pivot pin 21 so as to be rotatable in the front and rear directions. Both ends of the base 22 extend outward in the vehicle width direction of the truck 9, and a vertically elongated, box-shaped support frame 23 is supported at each end. These support frames 23, 23 extend downward from the end of the base 22 so as to sandwich the main steel cable 3 from the left and right sides.

Each workbench 11 is composed of a floor material 25 and a handrail material 26 surrounding the floor material 25. The workbench 11 is fitted into the frame of the support frame 23 so as to be vertically movable.

Elevating means 27 for elevating and lowering the workbench 11 is provided. This elevating means 27 includes an elevating motor 28 mounted on the base 22, and a pair of elevating drive chain wheels 29, 2 driven by the elevating motor 28.
9 and the lifting driven chain wheel 30, which are wrapped around the lifting driving chain wheel 29 and the lifting driven chain wheel 30, one end of which is connected to the upper end of the workbench 11, and the other end of which is connected to the upper end of the workbench 11.
A pair of lifting chains 31 connected to the lower end of 1,
Consists of 31.

Each workbench 11 is raised and lowered by operating the lifting chains 31, 31, etc. by forward and reverse operations of the lifting motor 28, and by raising and lowering the workbench 11, the working range of the main steel cable 3 in the vertical direction is expanded. It will be done. Further, a guide roller 33 that rolls on the vertical frame 23a of the support frame 23 when the workbench 11 is raised or lowered is supported by the workbench 11. The rolling of the guide rollers 33 prevents the workbench 11 from wobbling when going up and down, and allows it to move up and down smoothly.

Furthermore, an auxiliary footboard 34 is provided on the floor material 25 of the workbench 11 for widening the work platform. The auxiliary footboard 34 is capable of protruding from one workbench 11 toward the other workbench 11 and retreating freely. Further, a connecting footboard 35 is provided which is spanned between the protruding ends of both auxiliary footboards 34, 34 that protrude from both work platforms 11, 11, and this connecting footboard 35 is pivoted to the protruding end of one of the auxiliary footboards 34. It can be folded onto this auxiliary footboard 34 by its rotation.

Next, as shown in FIGS. 5 to 8, the drive device 1
2 will be explained.

A pair of friction rotating bodies 37, 37 are provided so as to sandwich each of the handrail steel cables 8, respectively. The friction rotating bodies 37, 37 are supported by the main frame 14, and the friction rotating bodies 37, 37 are connected to a traveling drive electric motor 38, which is a driving means provided on the main frame 14, via a gear reduction transmission 39. Linked together.

The deceleration transmission 39 has a pair of output shafts 41, 41 provided so as to sandwich the handrail steel rope 8, and one of the output shafts 41 is operatively connected to the travel drive motor 38 via a deceleration gear (not shown). This output shaft 41 and the other output shaft 41 are connected to four interlocking gears 4 so as to rotate in opposite directions.
It is connected by 2.

The friction rotary body 37 has a pair of drive chain wheels 43, 43 attached to each of the output shafts 41, respectively. The main frame 1 is connected to the output shaft 41 in the direction along the handrail steel cable 8.
4 supports a vertical shaft 44, and a pair of vertical chain wheels 45, 45 are attached to this driven shaft 44. Further, a roller chain 47 is wound around the driving chain wheel 43 and the driven chain wheel 45, and a handrail steel cable 88 is attached to the roller chain 47 via a sheet metal pedestal 48.
A large number of friction members 49 made of rubber or the like are attached so as to face each other.

A pressing means 51 is provided that elastically presses the friction member 49 against the handrail steel cable 8. To explain this pressing means 51, a support shaft 52 extending in a direction perpendicular to the handrail steel cable 8 is attached to the main frame 14.
The support shaft 52 is provided so as to be slidable in the axial direction of the support shaft 52. This support shaft 52 has a pair of brackets 53, 5.
3' is fitted onto the outside of the support shaft 52 so as to be slidable in the axial direction, and each of these brackets 53, 53' supports a presser shaft 54 that projects downward, the projecting end of which is positioned within the wound roller chain 47. I'm forced to. This presser shaft 54 is provided with a pair of presser plates 55, 55 that are in contact with the rollers of each roller chain 47. The end portions 55a of the presser plates 55 adjacent to each other along the handrail steel cable 8 are overlapped with each other, so that no step is formed on the joint surface with the roller chain 47.

One of the brackets 53, 53' is prevented from moving away from the other bracket 53' by a snap ring 57. In addition, the other bracket 53'
A biasing means 58 is provided for biasing the bracket 53 toward one of the brackets 53.

Regarding the biasing means 58, a bolt 59 is formed at the end of the support shaft 52, and a nut 60 is screwed into the bolt 59. A coil spring 61 is interposed between the other bracket 53' and the nut 60.
The coil spring 61 urges the brackets 53 and 53' to approach each other, so that the friction member 49 elastically pinches the handrail steel cable 8 via the holding shaft 54 and the holding plate 55. They are pressed against the handrail steel cables 8 in such a manner that they are attached to each other.

Further, in the above case, the sliding of the support shaft 52 with respect to the main frame 14 equalizes the pressing forces of both friction members 49, 49 against the handrail steel cable 8. In this case, the resilient force of the coil spring 61 is adjusted by turning the nut 60, thereby increasing the pressing force of the friction member 49 against the handrail steel cable 8, that is,
Frictional force is adjusted.

When the running drive electric motor 38 is operated in the above state, the friction member 49 is friction-bonded to the handrail steel cable 8, the cart 9 runs on the handrail steel cable 8, and the work platforms 11, 11 are moved accordingly. do.

In FIG. 2, the work platform 11 is
Inclination adjustment means 63 for tilting together with the support stand 10
will be provided. This inclination adjustment means 63 consists of an arm 64 protruding from the base 22 and the main frame 1.
4 and a hydraulic cylinder 65,
A piston rod of this hydraulic cylinder 65 is connected to the projecting end of the arm 64. Then, the support base 10 is tilted by the expansion and contraction operation of the hydraulic cylinder 65,
Thereby, even if the slope of the handrail steel cable 8 changes, the floor surface of the workbench 11 can be kept level.

In FIGS. 3 and 4, 67 is a cargo unloading device, which includes a winch 68 installed on the base 22 and a wire rope 69 wound around this winch 68.
and a loading case 70 provided at the end of the wire rope 69.

9 and 10 show other embodiments.
Regarding this, configurations different from those of the above-mentioned embodiments will be explained, and common configurations will simply be numbered in the drawings and their explanation will be omitted.

In the figure, the friction rotating body 37 is composed of a friction ring 72. This friction ring 72 is elastically pressed against the handrail steel cable 8 by the pressing means 51.

To explain the pressing means 51, a bracket 73 is provided which pivotally supports each of the friction rings 72 so as to be rotatable about a vertical axis. These brackets 73 are slidably supported on support shafts 74 provided on the truck 9 so that their axes extend in the width direction of the truck 9.

In addition, bolts 7 are attached to both the above brackets 73, 73.
5 is inserted, and a nut 76 is screwed into the threaded portion. The two brackets 7 are interposed between one bracket 73 and the nut 76.
Coil spring 7 that brings 3 and 73 closer to each other
7 is provided, whereby friction wheels 72, 72
elastically pinches the handrail steel cable 8. Also, at this time, the brackets 73, 73 relative to the support shaft 74
a friction ring 72 that sandwiches the handrail steel cable 8 by sliding;
The pressing forces of 72 are equalized. In this case, the resilient force of the coil spring 77 is adjusted by turning the nut 76, thereby adjusting the pressing force of the friction ring 72 against the handrail steel cable 8, that is, the frictional force.

(Effects of the Invention) According to the present invention, a pair of friction rotating bodies are provided which are arranged to sandwich the handrail steel cable, and this friction rotating body is supported by a truck and is interlocked with a driving means provided on the same truck. Since a pressing means is provided which connects these two friction rotating bodies and elastically presses them against the handrail steel cable, when the drive means is operated, the friction member frictionally joins with the handrail steel cable and the trolley is moved to the handrail. It travels on a steel cable, and the work platform moves along the main steel cable.

Therefore, since the trolley travels following the operation of the drive means, even when the trolley passes through the post grip position of the handrail steel cable, the trolley and the work platform supported by it will sway as in the past. This prevents any inconvenience from occurring and allows smooth movement of the workbench.

Further, according to the present invention, since the cart is self-propelled, there is no need for a conventional towing rope for moving the cart, and therefore there is no need for painting or maintenance inspection of the towing rope itself, or for moving the cart. There is no need to run the tow rope along the handrail steel cable each time the main steel cable is run, and therefore, work such as painting the main steel cable can be done easily.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a partial side view of a long suspension bridge, Fig. 2 is an overall side view of a scaffolding device, Fig. 3 is a view taken along the - line in Fig. 2, and Fig. 4 is a partial side view of a long suspension bridge. The - line arrow view in Figure 2 of the above, Figure 5 is the same as the 2nd figure of the above.
6 is a partially enlarged view of FIG. 5, and FIG. 7 is a cross-sectional view of FIG.
Figure 8 is a sectional view taken along the - line in Figure 5, and Figure 9.
10 and 10 show another embodiment, FIG. 9 is a side view of the truck, and FIG. 10 is a front sectional view of the same truck. 1...Long suspension bridge, 3...Main steel cable, 8...Steel cable for handrail, 9...Dolly, 11...Work table, 37...Friction rotating body, 38...Traveling drive electric motor (drive means),
51...pressing means.

Claims (1)

[Claims] 1. Equipped with a trolley that is supported by the handrail steel cables so that it can move on the handrail steel cables installed along the main steel cables of the long suspension bridge, and a work platform that is supported by the trolley and moves along with the trolley. In a mobile scaffolding device for a long suspension bridge, a pair of friction rotating bodies are provided which are arranged to sandwich the above-mentioned handrail steel cables, and this friction rotating body is supported by a trolley and is interlocked and connected to a driving means provided on the same trolley. A mobile scaffolding device for a long suspension bridge, further comprising a pressing means for elastically pressing both of these friction rotating bodies against a handrail steel cable.