JPS5852068B2 - Mobile ladder for working on the outside vertical wall of a covered cylindrical tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to work scaffolds on vertical walls of cylindrical tanks such as cone roofs and dome roofs, which do not have suspension rails attached to the canopy and have protrusions such as piping at several locations on the side walls of the tank. This relates to a mobile ladder used as a mobile ladder, in which a multi-level working platform is installed at an appropriate position on a rope hanging from a traveling trolley loaded on a canopy, and is rotatable along the outside vertical wall of the tank. , If you encounter a protrusion such as piping,
This invention relates to a movable ladder characterized by simplified attachment and detachment of the hanging portion so that it can be easily climbed over.

Conventionally, this type of cylindrical tank differs from a floating roof tank, which has a wind garter on the upper side that serves as a rotating rail around the tank side wall, because it is difficult to suspend a rotating movable ladder on the tank's outer wall. They relied on either main scaffolding made of logs or steel pipe scaffolding.

Therefore, there were many problems, such as the cost of scaffolding increasing and assembly and disassembly requiring surgical removal and time.

The present invention was developed in order to solve these conventional drawbacks.The present invention was developed in order to solve these conventional drawbacks. A ring-shaped hanging device is fixed to an arm protruding from the canopy of a traveling device which is configured to index wheels that roll on the upper side of the side plate of the tank and is made to run around the outer periphery of the side plate of the tank by fixing them to the traveling trolley. A plurality of rope-like objects are attached to the hanging device via the rope, one or more connecting rings are installed on the rope-like object, one or more work floors are suspended on the connecting rings, and This is a ladder for working on the outside vertical wall of a covered Nissho tank, in which two single pipes are suspended from the arms, cross bracing is attached to the single pipes, and the single pipes are fixed to the connecting ring.

By doing this, the assembly and disassembly of the mobile ladder is simplified, and the connection and disconnection of the traveling cart and rope rope and work floor are made extremely easy, thereby achieving the intended purpose.

The configuration and effects of the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is an overall perspective view of a movable ladder for working on the outer vertical wall of a covered cylindrical tank according to the present invention. The ring-shaped object 20 is wound in an annular shape one or more times, one of the string-like objects is passed through a pulley 4, and the pulley is configured to rotate around the annular string-like object.

On the other hand, a traveling trolley 3 running on transfer wheels 7 loaded on a canopy is connected with a rope 5.

In this case, the cable is connected to the pulley 4 with an appropriate tension applied by a tightening machine 6 so that the traveling carriage 3 does not fall off the canopy and does not enter the gas vent 2 side.

Furthermore, the touch rollers 16 fixed to the traveling cart 3 are wheels that roll in contact with the wall surface on the upper side of the tank side plate.

The traveling truck 3 is provided with an arm protruding from the wall surface of the tank side plate, to which an annular hanger 8 is fixed.

A flexible rope-like sling 10 of a fixed length is suspended from the annular sling 8, as shown in FIG. Gotoku, Tsuba 22.
The scissors are put together at 23, and the bolts 24 are used for tightening and fixing.

The above-mentioned hanging devices and connecting rings are arranged in a number of blood stool stages according to the working height of the tank side wall surface, and as shown in FIG. 3, a working floor 12 having can frame hooks at both ends is suspended for each connecting ring. .

Further, touch rollers 17 are inserted into the connecting ring 11 at certain places and fixed by positioning pins 21 so as not to contact the work floor 12 or the wall surface of the tank side plate and damage the side wall surface.

In such a configuration, when the traveling trolley 3 is pushed to run on the canopy, the work floor 12 of each stage will sway due to the inertia of each stage and the difference in loading capacity, which is dangerous. As shown in FIG. 1, a single pipe 18 is hung down, and a cross bracing 25, which is a diagonal member that crosses the joint portions 19 of both single pipes, is attached, and as shown in FIG. 3, The single tubes are fixed to each connecting ring with clamps 13 to provide rigidity in the longitudinal and lateral directions to the rope ladder-shaped work floor.

By fixing the handrail 14 to the splintered single pipe 18 at a distance of 75 CrrL to 105 cm from the floor surface of the work floor 12 with a clamp 13, danger from the rear side can be eliminated.

To go up and down to the work floor, a lifting ladder 15 may be used, which can be installed by simply inserting it into a hole drilled in the work floor 12.

Now, by suspending the rope-ladder-like work floor configured as described above from the traveling trolley 3 and making the traveling trolley travel on the canopy of the tank, work such as repairing and painting the vertical side walls of the cylindrical tank can be carried out extremely safely and efficiently. It can be done efficiently.

As mentioned above, log scaffolding and steel pipe scaffolding are the most inefficient and expensive, so they cannot be compared.
In addition, in conventional mobile ladders, if there are protrusions such as drain pipes for recovering rainwater, fire protection sprinkler pipes, etc. on the running circumference of the tank side wall, the structure of the mobile ladder is heavy and highly rigid.
Since it was almost impossible to climb over, several portable ladders were hung in places where there were no protrusions, or each time a protrusion was encountered, it was dismantled and reassembled.

Therefore, work was interrupted, efficiency was reduced, and assembly and disassembly required time and effort.

The present invention solves the drawbacks of the conventional technology by:
As mentioned above, the flexible rope-like hanging device 10, the connecting culm 11. The work floor 12 etc. are combined to form a rope ladder-like work floor, and the traveling trolley 3
The rope ladder-like work floor is easily connected to the ring-shaped hanging device 8 with a rope or the like, and the rope ladder-like work floor can be raised and lowered using a pulley 9 or pulley with a lead line as shown in FIGS. 1 and 2. It is designed so that it can be performed in a chill hall, etc.

Therefore, it is possible to easily attach the rope ladder-like work floor to the protruding arm portion of the traveling truck 3 without having to separate it, thereby significantly shortening the assembly and disassembly time, and eliminating the problem of overcoming the protruding portion. Settled.

To explain the assembly and disassembly of the mobile ladder of the present invention in order, the assembly work involves wrapping the rope 20 around the gas vent 2 on the canopy of the covered cylindrical tank 1, and passing the rope 20 through the pulley 4 to release the gas. Tightly tie both ends to the gas vent 2 so that it does not come off the gas vent 2.

Next, the traveling trolley 3, which is lightened for convenient transportation and dismantled into pieces, is assembled on the canopy, and the rope 5 is connected to the pulley 4 with a shackle or the like.

In this case, the tensioner 6 applies appropriate tension to the rope 5 to prevent the traveling truck 3 from falling off the canopy.

A tank side wall touch roller 16 fixed to the traveling trolley 3 is used to adjust the distance between the side wall and the work floor to a size that makes it easy to work (according to the scaffolding standards of the Industrial Safety and Health Regulations, openings without handrails must be 300 m or less. regulated.

) (The appropriate distance between the work surface and the work floor is normally between 150 and 300 wlt).

Further, an annular hanger 8 is attached to an arm protruding from the canopy of the traveling truck 3, and a pulley 9 and a pull rope for assembly and disassembly are set.

On the other hand, as shown in Fig. 2, the rope ladder-like working floor is constructed by suspending the working floor 12 by fixing the rope-like hanging devices 10 to the connecting ring 11 on the ground, and adjusting the required number of steps according to the height of the tank side wall surface. Formed by assembling and stacking.

The uppermost stage of the work floor is lifted by the arm part 1 of the traveling cart 3 by pulling the pull rope of the pulley 9, and the rope-shaped hanging device 10 is connected to the annular hanging device 8 with a shackle or the like.

After the rope ladder-like work floor 12 is suspended from the traveling carriage 3 in this manner, the lifting ladder 15 is attached from the lower stage toward the upper stage of the work floor 12.

Once you can go up and down the work floor, which is set up at equal intervals,
An anti-swaying single pipe 18 suspended from the traveling truck 3 is connected to each connecting ring 11 suspending the work floor using a plug connector 19 or the like, fixed with a clamp 13, and both The vehicle tube is stopped from shaking with cross bracing 25.

Furthermore, a handrail 14 is fixed to the single pipe with a clamp 13.

Further, a suitable touch roller 17 is inserted into the connecting ring 11 so that the rope ladder-like work floor is positioned at a constant distance from the side wall surface of the tank, and is fixed with a positioning pin 21 to complete the assembly.

Disassembly can be done in the reverse order of the assembly explained above, but
When climbing over a protrusion on the side wall of the tank, separate the anti-swaying single pipe 18 from the connecting ring 11 with the clamp 13, remove the lifting ladder 15, and move the uppermost rope-shaped hanging device 10 to the traveling trolley. 3 (annular hanging device 8 connected with
7 When the rope is removed, the rope ladder-like work floor will be suspended by the pulley 9, and when the tow rope is loosened, the rope ladder-like work floor will be in the state shown in Figure 2, and can be lowered to the ground. .

Projections such as piping on the side wall of a cylindrical tank are usually 6007n? 7I, so it is necessary to separate the rope ladder-like work floor from the traveling trolley, since the width of the work floor is 400 m or more according to the Industrial Safety and Health Regulations. The distance at f is 700 m or more, and the traveling trolley 3 can run through the trench 1 from which the anti-sway single pipe 18, the handrail 14, etc. are suspended, without coming into contact with the protrusions.

If the protrusion exceeds the above dimensions, it will hang down from the traveling trolley 3.

It's a good idea to temporarily remove everything you have.

Even if there are protrusions such as piping on the tank canopy, it will still be extremely lightweight with just 3 traveling trolleys.
It is easy to overcome the problem with just a few people.

As explained above, the present invention enables easy connection of a work floor section made up of a lightweight traveling trolley with an assembled truss structure and a flexible rope-like hanging device that can be assembled in one move. It is configured so that it can be separated or detached.

Therefore, unlike conventional mobile ladders that require heavy equipment such as cranes or tow trucks to assemble and disassemble heavy mobile ladders, input is sufficient for disassembly, and the work can be done in a short time. 4) Safety is the same as the conventional one.

Therefore, by attaching a rotating work floor to the vertical outer wall surface of a fixed-shaped covered cylindrical tank, inspection, repair, painting, etc. of the tank can be carried out efficiently, which was almost impossible in the prior art.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of an embodiment of the movable working ladder of the present invention, showing the state of use with the working floor hanging down. FIG. 2 shows a state in which a scaffold serving as a work floor is lifted up by a movable pulley and is about to be connected to a traveling trolley. FIG. 3 is a detailed perspective view of the upper and lower suspensions of the mobile work ladder of the present invention, the work floor, and the parts connected by the anti-sway single pipes, etc. The work floor, which serves as a scaffold, is suspended horizontally and in multiple stages. , and further shows a state in which each stage is prevented from swinging individually. FIG. 4 is a partially sectional view of the connecting culm showing the connected state of the upper and lower hanging devices, and FIG. 5 is a partially cutaway plan view thereof. In the figure, the explanations of the symbols representing the main parts are as follows: 1... A regular-shaped cylindrical tank with a vertical side wall surface, 2... Gas venting, 3... traveling trolley,
8... Annular hanging device, 9... Lifting pulley, 10... Rope-shaped hanging device, 11... Connecting ring, 12... Work floor, 13... Clamp, 18... Single pipe to prevent shaking, 25...
・Rirosfraisinccial.

Claims (1)

[Claims] 1. A running trolley loaded on the canopy of a cylindrical tank is roped vertically through a gas vent fixed near the center of the canopy using a rope,
In addition, a ring-shaped hanging device is fixed to an arm protruding from the canopy of a traveling device which is made to run around the outer periphery of the side plate of the tank by fixing the wheels that roll on the upper side of the tank side plate to the traveling trolley. Attach a plurality of rope-like hanging devices to the hanging device, install one or more connecting rings on the rope-like hanging device, suspend one or more work floors on the connecting rings, and place the connecting rings at appropriate positions. Attach a transfer wheel that contacts the tank side plate wall surface, further hang two single pipes from the arms of the traveling truck, and attach cross bracing to the single pipes,
A movable ladder for working on an outer vertical wall of a covered circular tank, characterized in that the single pipe is fixed to the connecting ring.