JP3268465B2 - Falling object protection method inside a large chimney - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates, in assembling the gondola at the inside bottom of the large chimney relates to falling objects protection how to protect the operator from falling objects, such as flakes of refractory material.

[0002]

2. Description of the Related Art When inspecting or repairing the inside of a large chimney, a gondola is erected in the chimney in order to transport working equipment and workers up and down. The gondola is disassembled and brought to the bottom of the chimney to be assembled. However, the refractory material inside the chimney, which is subject to inspection and repair, is degraded by chemical and physical actions such as corrosion, oxidation, and thermal expansion, and peels off due to slight fluctuations in external force such as vibration and pressure. It is in an easy state. In order to avoid personal injury due to the separation of the refractory material, conventionally, a shielding wall was extended from the stack to the inside of the chimney using a flue connected to the base of the chimney.
The work space was covered by this shielding wall (literature unknown).

[0003]

As described above, in the working mode of constructing a closed wall using a flue, construction and removal of the closed wall require a lot of manpower and time, and the construction cost is high. Is expensive. Further, depending on the connection height position of the stack to the chimney, it may not be possible to secure a work space necessary for assembling the gondola below the shielding wall.

Accordingly, an object of the present invention is to provide a method for protecting a fallen object that can more easily protect a worker against the fallen object and that can receive the fallen object at an arbitrary height position according to the size of the gondola and the like. Is to get the law .

[0005]

In the method for protecting falling objects according to the present invention, a hoisting rope 3 extended from a winch 2 is introduced into the chimney from an upper opening 4 of the chimney 1 and a working port opened at the base of the chimney 1. The lifting cable 3 was taken out of the chimney from 7, and the lifting cable 3 was connected to a hollow protective body 9 evacuated so as to be able to pass through the working port 7, and stored in the chimney via the working port 7. The protective body 9 is lifted by the winch 2 to a required height via the lifting cable 3, and after the protective body 9 is lifted, pressurized air is supplied to the protective body 9 through the hose 12 to expand the protective body 9 into a cylindrical shape.
It is a requirement that the inside of the chimney be divided up and down, and a work space for assembling the gondola is secured below it.

The protective body applied to the protective method includes a hollow endothelium 10 that expands in a cylindrical shape when filled with pressurized air, and a skin 11 that covers the bottom surface and the peripheral side surface of the endothelium 10.
And a supply / exhaust hose 1 derived from the bottom surface of the inner skin 10
2 and a connecting device 13 for connecting the hoisting rope 3, that the outer cover 11 and the connecting device 13 are connected by a number of ropes 14 that are radially tensioned, and that catches falling objects. It is required that the protective net 15 be arranged along the radial tension surface of the rope 14 so as to cover the entire upper surface, and that the inner skin 10 and the outer skin 11 are each formed of a foldable sheet material. .

[0007]

The protective body 9 expands into a cylindrical shape when filled with pressurized air, but can be handled as a sheet mass when deflated and crushed, so that the worker can work on the protective body 9 without entering the chimney. It can be put in and out through the mouth 7. The protection body 9 in the chimney can be raised and lowered to an arbitrary height by using the winch 2 and the lifting cable 3 provided for the gondola. Further, the inside of the chimney can be divided into upper and lower sections only by supplying pressurized air through the hose 12 and inflating the stack into a cylindrical shape.
Can catch falling objects.

[0008]

According to the fallen object protection method of the present invention, the protection body 9 is lifted to a required height by using the winch 2 and the hoisting line 3 provided for the gondola, and is expanded into a cylindrical shape by filling with pressurized air. The fallen object is received by the hollow protective body 9
A work space for assembling the gondola was secured below that, so the installation and removal of the protective structure against falling objects was more difficult than in the conventional work mode where a closed wall was constructed using a flue. It can be carried out quickly with fewer workers, and the construction cost can be sufficiently reduced. Since the protective body 9 can be freely moved up and down by the hoisting rope 3, depending on the size of the gondola and the space required for the assembling work,
This is advantageous in that the protection body 9 can be positioned at a required height, and protection against falling objects can be performed in the chimney 1 of any form without being affected by the connection position of the flue.

[0009]

1 to 3 show an embodiment according to the present invention. In FIG. 1, reference numeral 1 denotes a chimney, 2 denotes a winch installed near the chimney 1, and 3 denotes a gondola pulled out from the winch 2. It is a hoisting rope. The lifting cable 3 is introduced into the chimney via the upper opening 4 of the chimney 1. Specifically, a scaffold 5 is assembled near the upper opening 4, and the lifting cable 3 is introduced into the chimney 1 via the guide pulleys 6 provided on the arms 5a and 5b, and hangs down along the chimney central axis.

On one side of the base end of the chimney 1, a working port 7 for inspection and repair is opened. The gondola disassembled from the work port 7 is carried to the bottom of the chimney and assembled. In order to ensure safety when assembling the gondola, prior to carrying in the gondola components, a protective body 9 for receiving a falling object such as a piece of refractory material is installed in the chimney.

In FIG. 2 and FIG. 3, a protective body 9 includes a hollow inner skin 10, an outer skin 11 covering the bottom surface and the peripheral side wall of the inner skin 10, a hose 12 for supplying and exhausting air from the bottom surface of the inner skin 10, and an inner skin 10 A metal connecting device 13 connected to the hoisting rope 3 above, a group of ropes 14 connecting the connecting device 13 and the outer cover 11, a protective net 15 covering the upper surface of the inner skin 10, and the like.

The inner skin 10 is formed of a rubber film. The inner skin 10 can be expanded into a cylindrical shape when filled with pressurized air via a hose 12, and can be crushed into a sheet mass when evacuated through the hose 12. Although not shown, the hose 12 is connected to a supply air compressor and an air discharge pump provided outside the chimney 1 via a switching valve. The outer cover 11 is made of canvas, and latches 16 for latching the rope 14 are fixed at regular intervals along the upper opening edge. In a state where the endothelium 10 is expanded, the outer skin 11 is kept in a cylindrical shape in close contact with the endothelium 10.

The connecting device 13 includes a disk-shaped hanging plate 17, a hanging rod 18 protruding from the lower surface of the hanging plate 17, and a hook 19 fixed to the center of the upper surface of the hanging plate 17. The connecting member 13 and the outer cover 11 are connected by connecting the hanging plate 17 to the above-described hanging member 16 and the lower end of the hanging rod 18 to the hanging member 16 with a group of ropes 14, respectively. In the use state, the connection tool 13 is located above the opening edge of the outer cover 11. More specifically, the length of the rope 14 in the tensioned state is made larger than the radius dimension of the outer cover 11, and the arrangement of the ropes 14 in each of the upper and lower rows is formed in a radial shape along the cone surface. As described above, when the rope 14 is laid over the upper and lower two stages, the connecting device 13
And the outer skin 11 can be suppressed from being relatively twisted.

Using the lower rope 14, the protective body 9
The protective net 15 is arranged so as to cover the upper surface of the inner skin 10, that is, the entire upper surface of the inner skin 10. This protective net 15 was formed of a net material that can be folded. In FIG. 2, reference numeral 20 denotes an operation rope used for removing the protective body 9 from the chimney,
1 is a connection hook.

When using the protective body 9, the lifting cable 3 is taken out of the chimney from the working port 7, and the connecting hook 13 is hooked on the connecting member 13 of the vented protective body 9. Next, the lifting cable 3 and the protection body 9 are placed in a chimney, and the lifting cable 3 is hoisted by the winch 2, and the protection body 9 is lifted up to the same height as the working port 7. In this state, pressurized air is sent to the inner skin 10 via the hose 12 to partially inflate the inner skin 10 while preventing the rope 14 from tangling, and further, the protective body 9 is lifted to a required height. With the height of the protective body 9 determined,
The endothelium 10 is completely inflated, and the inside of the chimney is divided into upper and lower sections.
At this time, the outer skin 11 and the inner wall of the chimney 1 are substantially in close contact with each other, and since the upper and lower dimensions of the outer skin 11 are about 1 m, falling objects from above are received by the protective body 9.

After the protection body 9 is installed, the gondola components are carried into the chimney from the working port 7, where the gondola is assembled. The gondola has a ceiling wall for falling objects. When the assembly of the gondola is completed, the air inside the endothelium 10 is evacuated via the hose 12. Endothelium 10
With the withered enough, lower the protective body 9 slowly,
It is pulled out from the work port 7 while being manually manipulated by the operation rope 20. Next, the connecting hook 21 is taken out of the connecting tool 13 and connected to the gondola. Thereafter, the gondola is raised and lowered to check and repair the fireproof material in the chimney.

In addition to the above, the outer cover 11 of the protective body 9 can be formed of a net. In use, the protective body 9 may be in close contact with the inner wall of the chimney 1. The endothelium 10 can be formed of a plastic sheet material other than the rubber film. It goes without saying that the lifting cable 3 may be changed, for example, using a cremona rope for lifting the protection body 9 and using a wire rope for lifting the gondola.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a use state of a protective body.

FIG. 2 is a longitudinal sectional view of a protective body.

FIG. 3 is an external perspective view of a protective body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chimney 2 Winch 3 Elevating cable 4 Upper opening 7 Work opening 9 Protective body 10 Endothelium 11 Outer skin 12 Hose 13 Connecting device 14 Rope 15 Protective net

Claims (1)

(57) [Claims] 1. A hoisting rope 3 extended from a winch 2 is introduced into the chimney from an upper opening 4 of the chimney 1, and the hoisting rope 3 is taken out of the chimney from a working port 7 opened at the base of the chimney 1. The hoisting line 3 is connected to the hollow protective body 9 evacuated so as to be able to pass through the working port 7, and the protective body 9 housed in the chimney through the working port 7 is winch 2.
After lifting the protective body 9 to the required height via the lifting cable 3 and supplying the pressurized air to the protective body 9 via the hose 12, the protective body 9 expanded into a cylinder moves up and down the inside of the chimney. A method for protecting falling objects inside a large chimney, which has a work space for assembling a gondola below it. However, the protective body 9 is a pressurized air.
Hollow endothelium that expands cylindrically when filled with air
And an outer skin 11 covering the bottom surface and the peripheral side surface of the endothelium 10
And a supply / exhaust hose 1 derived from the bottom surface of the inner skin 10
2 and a connector 13 for connecting the lifting cable 3
That the outer cover 11 and the connecting device 13 are radially tensioned.
Connected by a large number of ropes 14
The protective net 15 to be received is the radial tension of the rope 14.
It should be placed along the upholstery so as to cover the entire top surface.
And each of the inner skin 10 and the outer skin 11 is folded.
It must be formed of a flexible sheet material.