JP4784209B2 - Blast furnace construction method and blast furnace disassembly method - Google Patents

Description

  The present invention relates to a blast furnace construction method and a blast furnace dismantling method that enable shortening the construction period of blast furnace construction work and dismantling work.

  When constructing a blast furnace due to refurbishment or constructing a new blast furnace, a work site (a so-called caisson) is set up at a place different from the blast furnace foundation (a so-called caisson) that is the construction site. It is divided into two or more ring-shaped blocks from the top of the blast furnace to the bottom of the furnace. At this time, construction of additional equipment such as stave and refractory bricks is completed at the assembly ground. In this way, each block manufactured at the assembly ground is transported to the blast furnace foundation to construct a blast furnace (see, for example, Patent Documents 1 and 2).

A conventional procedure of a construction method (hereinafter referred to as a block construction method) for constructing a blast furnace using blocks produced by dividing into rings will be described below with reference to FIGS.
In the construction of the blast furnace, the block A (that is, the furnace top block) located at the uppermost stage is manufactured at the ground assembly site and transferred to the blast furnace foundation 6. In order to transport the block A, the block A is placed on the suspension cart 3 on the block transport cart 5 at the assembly ground and transported to the vicinity of the blast furnace foundation 6. The block transport cart 5 is a cart traveling on a road surface, and tires are attached to the wheels.

  When the block A is transferred, the block A is lifted using a lifting device (not shown) and transferred to the suspension cart 3. There is a rail on the suspension cart 3, and a slide cart 8 is placed on the rail. The rail on the suspension cart 3 and the rail on the blast furnace foundation 6 are at the same level. Further, the rail on the upper surface of the suspension cart 3 and the rail on the blast furnace foundation 6 are fastened, and the block A is transported from the suspension cart 3 to the blast furnace foundation 6 together with the slide cart 8 while being mounted on the slide cart 8.

Next, the lower end of the wire rope 10 suspended from the lifting device 2a disposed on the furnace support column 1 is connected to the suspension member 9a. The block A is lifted by operating the lifting device 2a to wind up the wire rope 10.
Next, the block B (that is, the second stage block) located at the lower stage of the block A (that is, the furnace top block) is placed on the slide carriage 8 and guided directly below the block A, and the central axis of the block A and the block B are guided. Match the center axis of. This state is shown in FIG.

Since the procedure for transporting the block B manufactured at the assembly ground onto the blast furnace foundation 6 is the same as the transport procedure for the block A, description thereof is omitted.
As shown in FIG. 3, after the central axis of the block A and the central axis of the block B coincide with each other, the block A is lowered and the block A and the block B are joined.
Further, the block joined body obtained by joining the block A and the block B is lifted by the lifting device 2a, and the block C (that is, the third stage block) located at the lower stage is guided directly below the block joined body. After matching the central axis of C, the block joined body is lowered to join the block joined body and the block C together. Since the procedure for transporting the block C manufactured at the assembly ground onto the blast furnace foundation 6 is the same as the transport procedure for the block A, description thereof is omitted.

  Thus, as shown in FIG. 4, the block assembly located in the upper stage is sequentially lifted by the lifting devices 2a and 2b, and the block located below (hereinafter referred to as the lower block) is guided directly below the block assembly. After making the central axis of the block joined body coincide with the central axis of the lower block, the block joined body is lowered, and the block joined body and the lower block are joined to construct a blast furnace. FIG. 4 shows an example in which a blast furnace is constructed by dividing it into five blocks.

The conventional block construction method described above is for constructing a blast furnace by joining blocks manufactured in advance on a blast furnace ground on a blast furnace foundation. Therefore, the construction period can be shortened as compared with the construction method of constructing the blast furnace furnace body on the blast furnace foundation. However, it takes a long time to transfer the block manufactured at the assembly ground to the slide carriage through the suspension carriage or to attach / detach the suspension member for transferring the block. That is, the conventional block method has room for improvement from the viewpoint of further shortening the construction period.
JP 2000-282116 A Japanese Patent No. 3165362

  An object of the present invention is to provide a blast furnace construction method and a blast furnace demolition method that can solve the above-described problems and shorten the construction period of blast furnace construction work and demolition work.

The present invention divides the blast furnace body from the top to the bottom of the blast furnace into two or more ring-shaped blocks and manufactures them at the assembly ground, and then transports each block to the upper surface of the blast furnace foundation, sequentially. In the blast furnace construction method in which the upper block and the lower block are joined together to construct a blast furnace, an inclined road inclined in one direction from the road surface on which the block transport cart runs to the upper surface of the blast furnace base. Is installed at one place, and after the block transport cart travels from the road surface to the blast furnace foundation via the ramp, the position of the block transport cart is adjusted and the top block is lifted on the blast furnace foundation. In addition, the lower block located at the lower stage is transported onto the blast furnace foundation by a block transport carriage, and the central block axis of the lifted top block is aligned with the central axis of the lower block. Position the click transport carriage, a blast furnace construction method of joining the lower block is lowered the furnace top block thereafter.

Also, the present invention cuts the bottom of the blast furnace furnace body installed on the blast furnace foundation into a ring-shaped block, then lifts the furnace body structure located on the upper stage on the blast furnace foundation, In the blast furnace dismantling method in which the furnace body structure is lowered from the top, the lower part of the furnace body structure is cut into a ring-shaped block on the blast furnace foundation, and then sequentially transported from the blast furnace foundation, a block transport cart An inclined road that is slanted in one direction consisting of a ballast from the road surface on which the trolley travels to the upper surface of the blast furnace foundation is provided at one location, and the block transport cart travels on the road surface from the blast furnace foundation through the inclined road to carry out the ring-shaped block. It is a blast furnace dismantling method.

  ADVANTAGE OF THE INVENTION According to this invention, the construction period of a blast furnace construction or dismantling work can be shortened.

The blast furnace construction method of the present invention is an improvement of the block method. The blast furnace construction method of the present invention will be described below with reference to FIGS.
In the construction of the blast furnace, the block A (that is, the furnace top block) located at the uppermost stage is manufactured at the ground assembly site and transferred to the blast furnace foundation 6. At that time, the ramp 12 is provided from the road surface on which the block transport cart 5 travels to the blast furnace foundation 6 (so-called caisson). Then, the block A is placed on the block transport cart 5 at the assembly ground, and the block transport cart 5 is moved from the road surface to the blast furnace foundation 6 via the ramp 12. As a result, the transfer from the block transport cart 5 to the suspension cart 3 and the sliding of the slide cart 8 can be omitted. The ramp 12, since removed after the construction of the blast furnace has been completed, Ru arranged conveniently by using a rose nest.

The block transport cart 5 travels on the blast furnace foundation 6, transports the block A to a predetermined position, and stops. The block transport carriage 5 has forward / backward and turning functions and can be stopped at an arbitrary position.
Next, the suspension member 9a is attached to the block A, and the lower end of the suspension member 10 suspended from the lifting device 2a disposed in the furnace body support column 1 is connected to the suspension member 9a. Then, the block A is lifted by operating the lifting device 2a to raise the lifting material 10.

Next, the block B (that is, the second stage block) located at the lower stage of the block A (that is, the furnace top block) is placed on the block transport carriage 5 and guided directly below the block A, and the central axis of the block A and the block The central axis of B is matched. FIG. 1 shows this state.
Since the procedure for transporting the block B manufactured at the assembly ground onto the blast furnace foundation 6 is the same as the transport procedure for the block A, description thereof is omitted. In addition, since the suspension cart 3 and the slide cart 8 are not used, it is not necessary to attach a suspension member to the block B. Therefore, the work of attaching / detaching the suspension member can be omitted.

As shown in FIG. 1, after the central axis of the block A and the central axis of the block B are matched, the block A is lowered and the block A and the block B are joined.
Further, the block joined body obtained by joining the block A and the block B is lifted by the lifting device 2a, and the block C (that is, the third stage block) located at the lower stage is guided directly below the block joined body. After matching the central axis of C, the block joined body is lowered to join the block joined body and the block C together. Since the procedure for transporting the block C manufactured at the assembly ground onto the blast furnace foundation 6 is the same as the transport procedure for the block A, description thereof is omitted.

Thus, as shown in FIG. 2, the block assembly located in the upper stage is sequentially lifted by the lifting devices 2a and 2b, and the lower block is guided directly below the block assembly, so that the central axis of the block assembly and the center of the lower block After the axes match, the block assembly is lowered and the block assembly and the lower block are joined to construct a blast furnace.
FIG. 2 shows an example in which a blast furnace is constructed by dividing it into five blocks. The suspension member 9b is attached to lift the block joined body on the blast furnace foundation 6. The number of lifting devices 2a and 2b used for lifting the block assembly in this way may be set as appropriate according to the weight of the block assembly and the capacity of the lifting device, and is not necessarily limited to all blocks. There is no need to wear.

The blast furnace construction method of the present invention also includes a method of constructing a blast furnace by lifting each block with an individual suspension material, carrying in the lowermost block, and then lowering and joining each upper block.
As explained above, according to the blast furnace construction method of the present invention, the work of transferring the block from the block transport cart 5 to the suspension cart 3 or the slide cart 8 and the work of attaching / detaching the suspension member to the block can be omitted. The construction period of the block method can be further shortened.

  It is also possible to dismantle the blast furnace by reversing the procedure of the blast furnace construction method of the present invention. That is, as shown in FIG. 2, the furnace bottom block (that is, block E) of the blast furnace is cut, and the furnace body on the upper part is lifted. Next, after the furnace bottom block is carried out by the block transport carriage, the furnace body is lowered and the block D is cut. The block transport cart travels on the road surface from the blast furnace foundation through the ramp, and conveys the ring-shaped block to the demolition site. Thus, the blast furnace can be dismantled by carrying out the blocks sequentially from the blast furnace foundation using the block transport carriage.

  As shown in FIGS. 1 and 2, the present invention was applied, and the blast furnace was divided into five stages and constructed. That is, the ramp 12 was provided using the ballast, and the ring-shaped block manufactured at the assembly ground was transported onto the blast furnace foundation 6 by the block transport cart 5. The slope of the ramp 12 was 5%. Further, the block transport carriage 5 is run on the blast furnace foundation 6 and the blast furnace is constructed by joining the central axis of the block assembly located in the upper stage on the blast furnace foundation 6 with the central axis of the block located in the lower stage. did. This is an invention example.

On the other hand, as shown in FIGS. 3 and 4, conventionally, a block manufactured at the assembly site is placed on a block transport cart without a ramp, and further transferred to a slide cart via a suspension cart. A blast furnace was constructed by joining the central axis of the block assembly located in the upper stage on the foundation 6 and the central axis of the block located in the lower stage. This is a conventional example.
When the construction period required for the construction of the blast furnace was compared between the inventive example and the conventional example, the construction work that required 60 to 70 days in the conventional example could be shortened by three days in the inventive example.

It is sectional drawing which shows typically the state which lifted the furnace top block with the blast furnace construction method of this invention. It is sectional drawing which shows typically the state which lifted the block conjugate | zygote with the blast furnace construction method of this invention. It is sectional drawing which shows typically the state which lifted the furnace top block with the conventional block construction method. It is sectional drawing which shows typically the state which lifted the block conjugate | zygote with the conventional block construction method.

Explanation of symbols

1 Furnace column
2a Lifting device
2b Lifting device 3 Suspension cart 5 Block transport cart 6 Blast furnace foundation 7 Road surface 8 Slide cart
9a Hanging member
9b Suspension member
10 Hanging material
11 Hanging material
12 Ramp

Claims (2)

Divide the blast furnace body from the top to the bottom of the furnace into two or more ring-shaped blocks and manufacture them at the assembly ground, and then transport each block to the upper surface of the blast furnace foundation. In a blast furnace construction method for constructing a blast furnace by joining a block located at a lower block and a block located at a lower stage, a slope inclined in one direction consisting of a ballast from a road surface on which a block transport carriage runs to an upper surface of the blast furnace base is 1 The block transport carriage travels from the road surface through the ramp to the blast furnace foundation and conveys the furnace top block, and then adjusts the position of the block transport carriage, and the block transport carriage on the blast furnace foundation. The furnace top block is lifted, and the lower block located at the lower stage is transported onto the blast furnace foundation by the block transport carriage, and the center axis of the raised furnace top block and the Blast furnace construction method characterized by the central axis of stage blocks the position of the block the transport carriage and adjusted to match, joined with the lower block is lowered to the furnace top block thereafter. After cutting the bottom of the blast furnace furnace body installed on the blast furnace foundation into ring-shaped blocks, the furnace body structure located in the upper stage is lifted on the blast furnace foundation, and the block at the bottom of the furnace is removed from above the blast furnace foundation. In the blast furnace disassembling method, after the unloading, the furnace body structure is lowered, the lower part of the furnace body structure is cut into a ring-shaped block on the blast furnace foundation, and then sequentially removed from the blast furnace foundation. A ramp inclined in one direction consisting of a ballast from the road surface on which the transport carriage travels to the upper surface of the blast furnace foundation is provided at one location, and the block transport carriage travels on the road surface from the blast furnace foundation through the slope road. A method for dismantling a blast furnace, wherein the ring-shaped block is carried out.

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