JP2007246999A - Brick-laying method in converter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely perform the carry-in of bricks when the bricks are laid at the furnace bottom part in a converter, in which a term needed to the repair of the converter is not made too long and the working efficiency is not lowered. <P>SOLUTION: When the brick-laying at the furnace bottom part in the converter is performed, a brick drop-down preventive protector 11 obtained by arranging one or more of movable protective doors 11a fixable at an optional position at the lower end part, is set by inserting from the furnace hole 4a at the upper part of the converter 4. A pallet 2 is hung down into the brick drop-down preventive protector 11 under state of covering with a brick scattering preventive case 12, and the brick-laying at the furnace bottom portion in the converter while carrying the brick 1 on a pallet 2 from the lower end of the brick drop-down preventive protector 11, is performed. In this way, the brick and the pallet are not sprung out to the outer part of the protector for preventing the brick drop-down and the safety of workers for constructing the furnace can be secured. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bricking method for a converter that can ensure worker safety even when bricks fall into the furnace when bricks are stacked at the bottom of the converter. is there.

  In brickwork of converters, bricks are generally piled up from the bottom of the converter in the order of the furnace bottom, side walls, and throttle.

  Of these, brickwork at the bottom of the furnace is hand-built by the furnace construction worker. In this case, the bricks are brought in by using a wooden pallet 2 of about 1 m square with the bricks 1 arranged, as shown in FIG. 3 is a method of hanging on a hoist, moving with a crane installed on the furnace, and carrying it into the furnace. At this time, there is a case where the upper part of the brick is covered with a net as a fall prevention measure.

  There was a risk that the bricks arranged on the pallet would fall on the head of the furnace builder when the bricks were carried in at the bottom of the furnace. In addition, in the brickwork of the side wall part and the narrowed part performed after the brickwork of the furnace bottom part is completed, the bricks are carried into the furnace one by one using the brick carry-in machine, so that the bricks at the time of brickworking the furnace bottom part There is no danger at the time of delivery.

  As a safety measure, as shown in FIG. 4, each time a pallet is loaded, there is a method in which a furnace builder M puts a ladder and evacuates from the steel outlet 4 a of the converter 4 to the outside of the furnace.

  However, since only about 1 ton of bricks can be arranged on the pallet, if the weight of the bottom brick is about 100 tons when evacuating outside the pallet every time the pallet is loaded, It is necessary to evacuate about 100 times to complete the brickwork. Further, there is a distance of about 10 m for evacuation outside the furnace, and the evacuation involves raising and lowering the ladder, so that the evacuation of 100 times requires 17 hours.

  Such a conventional safety measure has a problem that the time required for repairing the converter becomes longer, the physical strength of the furnace builder is consumed, and the work efficiency is lowered.

Although a method of installing a evacuation site for a construction worker in the furnace is also conceivable, it is difficult to adopt such a method because it hinders brickwork.
In addition, as shown in FIG. 5, the method of enclosing the pallet 2 around the carrying-in position with a protective net 5 and retracting behind the protective net 5 is the simplest method. It is dangerous to do so and it is not a complete safety measure.

In addition, in brickwork of a converter, although the brick carrying-in apparatus to a converter is disclosed by patent document 1 and patent document 2, all are apparatuses which carry in a brick from a furnace bottom, and the brick of a furnace bottom part is carried out. It cannot be applied to carrying bricks when stacking. In addition, when these devices are applied, the equipment cost is high, and a space for storing pallets is also required under the furnace, which is not practical.
JP 11-131123 A JP 11-152513 A

  The problem to be solved by the present invention is that, in the conventional safety measures when carrying bricks at the bottom of the converter furnace, the time required for repair of the converter becomes longer, and the physical strength of the furnace builder is increased. It is a point that it is consumed and work efficiency falls.

The method of brickworking a converter according to the present invention is as follows.
To make it possible to carry in bricks at the bottom of the converter furnace in a safe manner without reducing the time required for repairing the converter and reducing the work efficiency.
When brickworking the bottom of the converter furnace,
A brick fall prevention protector with a length that can be taken out from the bottom and placed on the pallet from the bottom is installed above the converter,
The main feature of the brick fall prevention protector is that the pallet is suspended and the bottom of the converter is removed while the brick on the pallet is taken out from the lower end of the brick fall prevention protector.

  In the brick building method of the converter according to the present invention, if the lower end of the brick fall prevention protector is further provided with one or more movable protective doors that can be fixed at an arbitrary position, Even if bricks fall and scatter, the safety doors can ensure the safety of the construction workers more reliably.

  Also, in the brick-laying method of a converter according to the present invention, if the inside of the brick fall prevention protector is suspended while the pallet is covered with a brick scattering prevention fence, the wire rope breaks and the pallet falls. Can also prevent bricks from scattering.

  In the present invention, when bricks are applied at the bottom of the converter furnace, bricks are carried in using a brick fall prevention protector, so that bricks due to wire rope breakage, falling of pallets, or falling bricks on pallets In addition, bricks and pallets can be prevented from jumping out of the brick fall prevention protector. Therefore, the brick does not fall on the overhead of the furnace construction worker, and safety can be ensured.

  In addition, if one or more movable protective doors having a structure that can be fixed at an arbitrary position are provided at the lower end of the brick fall prevention protector, the protective door also exists at the falling point. As a result, even if the bricks fall down, even if the bricks fall, the safety of the construction worker will be more secure.

  Furthermore, if the inside of the brick fall prevention protector is suspended while the pallet is covered with a brick scattering prevention jar, even if the brick or pallet falls due to a wire rope breakage, the scattering can be prevented.

Hereinafter, the best mode for carrying out the brickworking method for a converter according to the present invention will be described in detail with reference to FIGS.
FIG. 1 is a diagram for explaining a first mode for carrying out the brick-laying method for a converter according to the present invention, and FIG. 2 is a diagram for explaining a second mode similar to the above.

  Reference numeral 11 denotes a brick fall prevention protector, for example, a reinforcing bar having an outer diameter of 15 mm formed into a grid-like cylindrical shape using a ring-shaped equilateral mountain-shaped steel, and has a circumferential angle of 70 ° at its lower end. Two protective doors 11a capable of protecting the range are installed in a suspended manner. Note that the size of the cylinder may be any size as long as the pallet 2 having a side of about 1 m can pass through.

  The protective door 11a is provided so as to be movable along a rail 11c installed at the lower end of the main body portion 11b of the brick fall prevention protector 11, and can be fixed at an arbitrary position by a braking mechanism (not shown). ing. In the example of FIGS. 1 and 2, a protective net 11d is provided at the lower end of the protective door 11a to fill a gap with the bottom of the converter furnace.

  An example in which the brick 1 is carried in using such a brick fall prevention protector 11 and bricks are stacked at the bottom of the converter furnace will be described with reference to FIG.

  First, the brick fall prevention protector 11 is installed on the deck 6 above the converter 4 with a crane. In this installed state, the lower end of the protective door 11a, which is the lowermost end of the brick fall prevention protector 11 inserted from the furnace port 4b, is positioned slightly above the furnace bottom when the brickwork is finished.

  In this state, the pallet 2 on which the bricks 1 are arranged is inserted into the brick fall prevention protector 11, and is suspended to the lower part of the furnace. The hanging method uses a wire rope and a hoist as in the conventional method.

  After hanging down to the lower part of the furnace, the furnace operator M moves the fixed door 11a to a predetermined position and fixes it, then takes out the bricks 1 arranged on the pallet 2 and bricks the bricks at the bottom of the converter 4 I do.

  Thus, in this invention, since the brick 1 is carried in using the protector 11 for brick fall prevention, the brick 1 and the pallet 2 fall by wire rope breakage, or the brick 1 on the pallet 2 fell during carrying in. Even in this case, the brick 1 and the pallet 2 do not jump out of the brick fall prevention protector 11, and the safety of the building worker M can be secured.

  FIG. 2 shows an example in which the pallet 2 is hung in a state of being covered with the brick scattering prevention ridge 12 when the brick 1 is carried in using the brick fall prevention protector 11 described above. In this case, the bricks 1 arranged on the pallet 2 are previously covered with the brick scattering prevention rods 12 and then suspended, and the carrying-in method is the same as described above.

In this case, the bricks 1 arranged on the pallet 2 are covered with the brick scattering prevention ridges 12 as follows.
First, as shown in FIG. 2 (b), two boat shapes (for example, a hollow square member having a width of 125 mm, a height of 75 mm, and a thickness of 2.3 mm) 12a are formed on the lower surface of the pallet 2 placed between the soils. After the insertion, the hooked hanging tool 12b is put on the pallet 2 from above. Thereafter, the hooks 12ba of the hanger 12b are fixed to the four locations of the boat shape 12a and hung with a hoist.

  In the example of FIG. 2, even if the brick 1 or the pallet 2 is dropped due to a wire rope breakage, the scattering can be prevented, and the safety of the construction worker M can be ensured more reliably.

The present invention is not limited to those shown in the above-described embodiments, and it goes without saying that the embodiments may be appropriately changed within the scope of the technical idea described in each claim.
For example, the door without the protective door 11a may be used. In this case, the brick 1 on the pellet 2 is taken out between the lower end of the main body portion 11b of the brick fall prevention protector 11 and the lower part of the furnace.

  The present invention is not limited to carrying bricks at the bottom of the converter furnace, but can also be applied to carrying many bricks arranged on a pallet into a molten steel pan at the same time.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the 1st form for implementing the brick-laying method of the converter of this invention, (a) is the whole schematic, (b) is the attachment of the protective door to the main-body part of a brick fall prevention protector. It is an enlarged view of a part. It is a figure explaining the 2nd form for enforcing the brickworking method of the converter of the present invention, (a) is a schematic diagram of the whole, (b) is an explanatory view in the case of covering with a scattering prevention gutter. It is a figure explaining the conventional brick carrying-in method in the case of brickwork to a furnace bottom part. It is explanatory drawing in case a furnace builder hangs a ladder and evacuates out of a furnace from the steel outlet of a converter every time a pallet is carried. It is a figure which shows the method of enclosing the circumference | surroundings of the carrying-in position of a pallet with a protection net, and evacuating behind this protection net.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brick 2 Pallet 4 Converter 11 Brick fall prevention protector 11a Protective door 12 Splash prevention fence

Claims (3)

When brickworking the bottom of the converter furnace,
A brick fall prevention protector with a length that can be taken out from the bottom and placed on the pallet from the bottom is installed above the converter,
A brick building method for a converter, wherein a pallet is suspended in the brick fall prevention protector, and bricks are stacked at the bottom of the converter furnace while taking out bricks on the pallet from the lower end of the brick fall prevention protector.   The lower end of the brick fall prevention protector is further provided with one or more movable protective doors, and the protective doors have a structure that can be fixed at an arbitrary position. The brick building method for a converter according to 1. The brick stacking method for a converter according to claim 1 or 2, wherein the inside of the brick fall prevention protector is suspended in a state where the pallet is covered with a brick scattering prevention basket.

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