JPH0329923B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cart for dismantling a catwalk floor assembly.

(Prior technology) When installing the main cable in construction work for a long suspension bridge, multiple cable walk ropes are installed parallel to each other between the main tower and abutment, and a floor structure is constructed on the ropes to suspend the cable. It is common to construct so-called catwalks as scaffolding.

After the main cable is installed, the catwalk floor assembly must be dismantled and removed, but conventionally, when removing this floor assembly, many bridges were removed, regardless of the center span or side spans of long bridges. Currently, work at high places is carried out by several workers and manual work at the heights, which is dangerous and inefficient work that depends mostly on the skills of the workers.

On the other hand, as a trolley for maintenance and inspection of the main cable after construction of a long bridge is completed, there is one described in Japanese Patent Publication No. 53-40029.

In this trolley, the main cable of a long suspension bridge and the hand rope directly above it are inserted through the front and back direction of the approximately central part of an aluminum cage, and the cage is supported on the hand rope via a traveling pulley.
The cage runs on hand ropes like a so-called ropeway, and in this case, the inspector can get on the work floor of the cage and inspect or paint the main cable, making it extremely safe and efficient. It is said to be good.

(Problem to be Solved by the Invention) By the way, everyone seems to be wondering if it is possible to repurpose the trolley described in the above-mentioned publication when removing the above-mentioned catwalk floor assembly. Diversion is considered to be extremely difficult for the following reasons.

First, in the bogie described in the publication, the running pulley is placed on the hand rope to support the entire bogie, so when the bogie sways due to crosswinds etc., the running pulley is There is a risk of falling off the hand rope, which is extremely dangerous. Furthermore, when dismantling and removing the floor assembly, unlike work such as inspecting the main cables, the movement of the workers is intense, and even when there is no crosswind, this often causes the trolley to vibrate. There's a lot of danger.

Furthermore, since the purpose of the trolley described in the publication is to inspect the main cable, etc., the trolley is constructed so that it remains horizontal at all times, but this can be a problem when dismantling the floor assembly. In other words, since the canopy floor assembly is usually installed approximately parallel to the main cable, keeping the trolley horizontal means that, for example, the vertical distance between the bottom of the trolley and the floor assembly depends on the inclination of the main cable. In that case, the floor assembly is the bottom of the cart (work floor).
When the worker comes to a much higher place, for example, the worker is forced into an awkward position, which increases the danger and is even less desirable for demolition work.

The present invention has been made in consideration of these circumstances, and it is an object of the present invention to provide a cart for dismantling floor assemblies that is most suitable for dismantling floor assemblies safely and quickly. purpose.

(Means for Solving the Problems) In order to achieve the above object, the present invention has taken the following technical means.

That is, the present invention provides a pair of hand ropes 11 extending along and directly above the main cable 14,
A cat walk floor assembly for dismantling the floor assembly A built around a cat walk rope 5 running on the main cable 11 and extending below the main cable 14 in a left-right distribution pattern when viewed from the front. The cart 15 is a demolition cart, and the cart 15 has a running frame F that runs on the hand ropes 11, 11 via running pulleys 16, 16, a main shaft 22 at the front and rear of the frame F,
Hanger plates 24, 24, 24, 24, which are bifurcated in front view and are pivotally connected to both ends of the rope 22, and hanger plates 24, 24, 24, 24 that are pivotally connected to both ends of the rope 22, and hanger plates 24, 24, 24, 24 that are pivotally connected to both ends of the The hanger plate 2 is made up of a dismantling cage 18 that is suspended so as to be positioned in the same position as the traveling frame F, and a dismantling cage 18 that is movable.
4 and 24 are pivotally connected by a side plate 26 on the lower end side thereof, and the traveling frame F
One end of the dismantling cage 18 in the running direction is secured as a dismantling work area for the floor assembly A, and the cat walk rope is located at a position other than the work area in the running direction of the cage 18. The present invention is characterized in that a back-up pulley 21 is provided which engages with the carriage 5 from below to prevent the entire carriage 15 from wobbling laterally.

(Function) The trolley 15 runs on the hand rope 11 as an existing structure via the running pulley 16 on its upper part.

The upper part of the truck 15 is formed into a parallel link shape in side view by the traveling frame F, the hanger plate 24, and the side plate 26 being pivotally connected to each other.
Cage unit 15b forming the lower part of the trolley 15
is always maintained at approximately the same inclination as the main cable 14 and the catwalk rope 5 (see FIG. 6).

Further, the demolition cable 18 is located below the cat walk rope 5 and has a back up pulley 21 that engages with the rope 5 from below. The traveling pulley 16 is prevented from falling off the hand rope 11.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, an outline of a cat walk in constructing a long suspension bridge and an example of a floor assembly structure will be explained using FIGS. 1 to 5.

In Figure 1, 1 and 2 are the main towers, 3 is the abutment, and between them, that is, the center span and side spans,
A main cable 14 is installed. In addition, 12
13 is a hand rope suspended from the main cable 14, and 13 is a storm rope.

In FIGS. 2 to 5, reference numeral 4 denotes a catwalk as a suspended scaffold, and a plurality of cables are installed below the main cable 14 in a left-right pattern when viewed from the front (FIG. 4). A floor assembly is constructed around the walking rope 5, and the floor assembly consists of a bottom structure U and a side structure S.

The bottom structure U includes cross beams 9 that connect the cross beams 9 to each other on the cat walk ropes 5, step members 7 attached to the left and right cat walk ropes 5 with a predetermined interval between the cross beams 9, and the steps. It consists of a wire mesh 6 and a synthetic fiber net 8 laid on a material 7. Further, the side structure S includes handrail supports 10a erected from both ends of the cross beam 9, and the support posts 10a.
The handrail rope 11a is continuously installed between the handrail ropes 11a, and the wire mesh 6 and the synthetic fiber net 8 are also attached between the ropes 11a.

6 and 7 show the structure of a truck 15 for dismantling the floor assembly.

In the same figure, reference numeral 11 denotes a hand rope, which is inserted through the upper ends of a pair of support columns 10, 10 that are erected from cable hands 14a, which are normally provided on the main cable 14 at predetermined intervals in the longitudinal direction.
It extends along the main cable 14 and directly above it. Note that the hand rope 12 is also attached via a cable band 14a.

The trolley 15 in this embodiment includes a running frame F at the uppermost position of the trolley 15 that can run using the hand rope 11 as a rail, and a hanger plate 24 pivotally connected to the frame F.
and a cage unit 15b having a disassembly cage 18 suspended from the plate 24.

The traveling frame F includes a pair of traveling pulleys 1
The two main shafts 22, 22 having the main shafts 6, 16 are connected by three connecting members 23, 23, 23 extending in the front-rear direction to form a frame shape in plan view. , 22 are pivotally connected to hanger plates 24 at both ends in the longitudinal direction, respectively.

As shown in FIG. 7, the hanger plate 24 has a bifurcated shape when viewed from the front, and is suspended downwardly with respect to the main shaft 22. The gap between the two is connected via a connecting pin 25 on the lower end side.
They are pivotally connected to each other by side plates 26, 26 of the book. Therefore, the front and rear hanger plates 24, 24, the connecting member 23 of the traveling frame F, and the side plate 26 form a parallel link in a side view, as shown in FIG. There is.

Also, between the two side plates 26, 26, the inner side (the main cable 14 in FIG.
On the opposite inner surface side of the side plate 26 of
Side rollers 30 are arranged in front and back through a bracket 28 and a buffer spring 29, and these side rollers 30, as shown in FIG.
The main cable 14 is brought into elastic contact with the main cable 14 from the left and right sides, thereby preventing the entire truck 15 from wobbling laterally.

The cage unit 15b includes a dismantling cage 18 located at the lowest part thereof, a hanging member 31 pivotally connected to the upper surface of the cage 18, and a mounting pin fixed to the hanging member 31 midway in the vertical direction. and a loading cage 17 supported via 32.

The dismantling cage 18 is connected to a hanging member 31 at approximately the center in the longitudinal direction and at the rear end thereof, thereby ensuring a floor assembly dismantling work area in the front side of the cage 18. . Further, the dismantling cage 18 is located further below the catwalk rope 5, and the loading cage 17 is located above the rope 5. , the rope 5
As shown in FIG. 7, the upper and lower cages 17, 1
8 and between the left and right hanging members 31, 31.

Reference numeral 21 denotes a back-up pulley, which is provided at a position other than the work area in the dismantling cage 18, in this embodiment, at the rear end of the cage 18. Furthermore, this pulley 21 is attached upward from the upper surface of the disassembly cage 18, and engages with the catwalk rope 5 from below to prevent the entire truck 15 from swinging laterally.

Further, 33 is a stroke-adjustable connecting member such as a chain block, which connects each lower end of the hanger plate 24 and the upper end of the hanging member 31, so that the entire cage unit 15b is suspended. It's summery.

Furthermore, 20 is a drive rope, and the main shaft 22
The rope 20 is connected to an eyepiece 27 provided at the center of the tower, and by winding or letting out the rope 20 using a winch or the like provided at the top of the tower (not shown), the entire truck 15 can be moved.

Next, a procedure for attaching the trolley 20 to the hand rope 11 will be explained.

First, a starting point for disassembly using the trolley 20 is selected, and it is dismantled to a length that allows the trolley 20 to be set using the same conventional construction method, leaving the cat walk rope 5 in a bare state. In this case, the starting point is optional, but it must be a place where a tower crane or truck crane can be used.

Next, the cage unit 15b (excluding the loading cage 17) is lifted up to just below the cat walk rope 5 by a crane, and the cage 1 for dismantling is
8 is tied and fixed to the rope, and then the crane is temporarily released. Then, the loading cage 17 is positioned directly below the cat walk rope 5 and directly above the dismantling cage 18 using a crane, and the hanging member 3
1 is erected and the loading cage 17 is pivotally supported by the member 31. Note that this work is carried out using the dismantling cage 18.
It can be done above, so there is little danger. After the loading cage 17 is set, the cage 17 is temporarily placed on the side of the catwalk rope 5, and the crane is released again.

Next, after attaching the connecting member 33 to the lower end of the hanger plate 24 in advance, the traveling frame F and the hanger plate 24 are lifted together with a crane and placed on the hand rope 11,
After connecting the drive rope 20 to a winch (not shown), the crane is released.

Subsequently, after adjusting the position so that the side rollers 30 come into elastic contact with the main cable 14 side, the traveling frame F is first run to just below the existing cage unit 15b, and is connected to the hanger plate 24 by the connecting member 33. The hanging member 31 is connected to release the dismantling cage 18 from the binding and fixation with the cat walk rope 5.

Finally, by adjusting the stroke of the connecting member 33, the traveling pulley 16 on the upper part of the truck 15
The setting of the carriage 15 is completed by appropriately adjusting the vertical distance between the pulleys 16 and 21 and the lower backup pulley 21, and adjusting the contact between these pulleys 16 and 21 and each rope 11 and 5, as well as the attitude of the cage unit 15b. .

After completing the setting of the trolley 15 in this way, a worker riding on the work area of the demolition cage 18 moves the trolley 15 forward (to the left in FIG. 6) as shown in FIG. Floor construction A will be dismantled one by one. At this time, in this embodiment, since the cages 17 and 18 are arranged above and below the cat walk rope 5, small items among the floor assembly constituent members located below the rope 5 are placed in the dismantling cage 18. Also, small items generated above the rope 5 can be stored in the loading cage 17.
The structure is very easy to work with. Incidentally, heavy objects such as the wire mesh 6 and the cross beams 9 may be placed in a concentrated manner in the section where the floor assembly has not been dismantled, and then lifted down by a crane before the trolley 15 reaches that section.

Further, in this embodiment, a parallel link is formed at the upper part of the carriage 15, and the cage unit 15 is provided at the lower end of the link, that is, at the lower end of the hanger plate 24.
b has a structure that allows it to be suspended, so the 6th
As shown in the figure, the inclination of the cage unit 15b in the running direction automatically matches the inclinations of the main cable 14 and the catwalk rope 5. Therefore, even if the inclination of the catwalk rope 5 changes as the demolition work progresses, the vertical distance between the floor assembly to be dismantled and each cage 17, 18 will always be approximately constant, which will be convenient for the worker. Since the height of the object to be dismantled is always constant, it is possible to avoid working in an unreasonable posture as in the past, and to achieve extremely safe and quick work.

Furthermore, in this embodiment, the backup pulley 21
By providing this, it is possible to prevent the entire truck from moving laterally, and since the pulley 21, together with the traveling pulley 16, firmly regulates the vertical position of the truck 15, it is possible for the operator to Even if it receives slight vibration or crosswind due to operation, the running roller 1
6 does not fall off from the hand rope 11,
Very safe. Although the vertical distance between the hand rope 11 and the cat walk rope 5 is not always constant, in the case of this embodiment, it can be adjusted by adjusting the stroke of the connecting member 33.

Note that in this embodiment, the cage unit 15b
The reason why the structural members of the truck such as It was for the same reason that they were able to advance and retreat freely.

Although one embodiment of the present invention has been described above, the present invention is not limited to this.

For example, as shown in FIG. 8, on the opposing floor surfaces and side surfaces of the left and right dismantling cages 18, 18, a connecting floor surface 18a and connecting side surfaces 18b, 18b that can be freely engaged and detached from one side to the other;
Each is attached so as to be openable and closable via a hinge 19 or the like,
The left and right dismantling cages 18 may be connected and integrated except when the trolley 15 avoids the hanger rope 12.

Moreover, it goes without saying that the trolley 15 itself may be provided with a traveling drive source so that it can run on its own.

(Effect of the invention) As explained above, according to the present invention, the trolley 1
5. Due to the parallel link structure on the upper part, the demolition cage 18, that is, the demolition work area, is always maintained at approximately the same inclination as the cat walk rope, so that for the worker, the object to be dismantled is always at a constant height. This allows you to work quickly without having to take an awkward posture.

Furthermore, the back up pulley 21 provided on the disassembly cage 18 prevents the connecting member 15 from swinging laterally, and together with the traveling pulley 16 on the upper part of the truck 15, firmly regulates the vertical position of the truck 15. There is almost no risk that the traveling pulley 16 will fall off the hand rope 11, and it is very complete.

[Brief explanation of drawings]

1 to 8 show an embodiment of the present invention,
Fig. 1 is an explanatory diagram of the long bridge and the catwalk, Fig. 2 is a plan view of the main part of the catwalk floor assembly, Fig. 3 is a side view of the same, and Fig. 4 is a sectional view taken along line C-C in Fig. 2. , FIG. 5 is a sectional view taken along the line D--D in FIG. 2, FIG. 6 is a side view of the truck, FIG. 7 is a front view thereof, and FIG. 8 is a perspective view showing a modification of the dismantling cage. 5... Cat walk rope, 11... Hand rope, 14... Main cable, 15... Trolley, 16... Traveling pulley, 18... Demolition cage, 21... Backup pulley, 22... Main shaft, 24...hanger plate, 26...side plate, F...travel frame.

Claims (1)

[Scope of Claims] 1. While running on a pair of hand ropes 11, 11 extending directly above the main cable 14, the hand ropes 11, 11 extend below the main cable 14 in a left-right distribution shape when viewed from the front. This is a cat walk floor assembly dismantling trolley for dismantling the floor assembly A constructed around the installed cat walk rope 5, and the trolley 15 is connected to the hand rope 11 via running pulleys 16, 16. , 11, and a main shaft 22 at the front and rear of the frame F.
Hanger plates 24, 24, 24, 24, which are bifurcated in front view and are pivotally connected to both ends of the rope 22, and hanger plates 24, 24, 24, 24 that are pivotally connected to both ends of the rope 22, and hanger plates 24, 24, 24, 24 that are pivotally connected to both ends of the a dismantling cage 18 that is suspended so as to be positioned so as to be able to travel together with the traveling frame F, and the hanger plates 2 that are arranged in front and behind in the traveling direction.
4 and 24 are pivotally connected by a side plate 26 on the lower end side thereof, and the traveling frame F
One end side of the dismantling cage 18 in the running direction is secured as a dismantling work area for the floor assembly A, and the cage 18 is arranged in a position other than the working area in the running direction of the cage 18. A cart for dismantling a catwalk floor assembly, characterized in that a back-up pulley 21 is provided which engages with a rope 5 from below to prevent the entire cart 15 from wobbling laterally.